CN104446194A - Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete - Google Patents
Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete Download PDFInfo
- Publication number
- CN104446194A CN104446194A CN201410658945.2A CN201410658945A CN104446194A CN 104446194 A CN104446194 A CN 104446194A CN 201410658945 A CN201410658945 A CN 201410658945A CN 104446194 A CN104446194 A CN 104446194A
- Authority
- CN
- China
- Prior art keywords
- concrete
- cement
- water
- sulfate
- reducing agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a novel concrete highly resistant to sulfate attack as well as a preparation method of the novel concrete. The novel concrete highly resistant to sulfate attack is prepared from the following formula components in percentage by weight: 8.0-8.4% of cement, 5.1-5.5% of superfine slag powder, 56-58% of coarse aggregate, 24-26% of fine aggregate, 0.01-0.03% of polycarboxylic high performance water-reducing agent and 4.5-6.0% of water; the prepared concrete highly resistant to sulfate attack is suitable for concrete works under the conditions of sulfate attack concentration of above 8000mg/L, concrete compression strength of C20-C40, frost resistant grade F200 and impervious grade W6; the novel concrete highly resistant to sulfate attack has wide practicability and application value for solving the objective situation that the concrete prepared from sulfate resistant cement in the prior art still fails in resisting SO4<2-> attack having the concentration of above 8000mg/L, and a lot of defects and technical problems existing in the technical field of the sulfate attack resistant concrete.
Description
Technical field
The present invention relates to technical field prepared by engineering construction concrete.Specifically, the present invention relates to a kind of novel concrete of high sulfate resisting erosion and the technical field of compound method and application thereof.
Background technology
Concrete is the main raw of modern project structure, and the annual concrete consumption of China is about 2,000,000,000 m
3, at the forefront in the world.Along with Materials science and the development of engineering and improving constantly of concrete performance, concrete is used in the important structure position such as bridge, high-rise building, water resources dam, Nuclear power plants, underground structure more and more.Concrete normally makes gelling material with cement, sand, masonry gather materials, with water by coordinating by a certain percentage containing admixture and adulterant, the cement concrete obtained through stirring, also normal concrete is claimed, it has that easy-formation, energy consumption are low, good endurance, low price and be combined the advantage that can be made into various load larrying member with steel, is contemporary most widely used material of construction, plays a very important role the development of human society.
China is a continental typical country, is again a maritime state.Along with the fast development of China's economic construction, China more and more payes attention to the construction of the exploitation of oceanic resources, littoral zone and bridge spanning the sea.Such as, harbour in ocean construction project, the bridge pier of bridge spanning the sea, seawall bank, dock, waterborne moveable source mill, offshore drilling platforms, seabed oil tank and tunnel, the inferior engineering of pipeline littoral; In addition, containing a large amount of soluble salts such as rock salt, saltcake, gypsum in western China is as the underground water and soil in province many areas such as Qinghai, Xinjiang, S0
4 2-concentration is very high.The existing middle sulphate resisting portland cement of China and high sulfate-resistant cement, be the neat portland cement that the Portland clinker that meets certain mineral composition requirement adds a small amount of dihydrate gypsum intergrinding, its corrosion-resistant property is very not desirable.
As everyone knows, sulphate attack problem is a key issue of concrete durability aspect, China is the prone areas of Concrete Sulfate Attack, and the concrete structure as coastland, the Northwest, southwest all exists the wprks example caused because of sulphate attack.And under different geographical and weather, there is dissimilar sulphate attack.Development sulfate resisting Portland cement kind or preparation Sulfate corrosion-resistant concrete can become in order to solve concrete sulphate-corrosion resistance the technique means that engineering circles generally adopts, existing large quantifier elimination both at home and abroad, and have lot of documents.Main technical content is: sulfate resisting Portland cement is mainly by control (the i.e. control C to cement clinker mineral composition
3s, C
3a, C
4the proportion of composing of AF etc.), normally improve C
3s ratio, high C
3the object that S content can make concrete reach early strong, with improve its shaping after degree of compactness, and make concrete reach the effect of resisting erosion of sulfate with this.The Special Anti sulfate cement that such as patent CN96118342.X announces and production method thereof: its primary chemical mechanism is within concrete plastic stage and sclerosis elastic limit, completes CaO, CaSO
4, C
4a
3s changes into the reaction of ettringite.This technology can the degree of compactness of refinforced cement stone, improves intensity and the anti-permeability performance of Behavior of Hardened Cement Paste, thus reaches the object of resisting erosion of sulfate.But this type of invention for form of sulfate attack more single, there is huge difference in action effect under different sulfate corrosion environment.Antagonism sulfate concentration is relatively low, has certain limitation, usually cannot resist concentration at 8000 more than mg/L SO
4 2-corrode.And this type of sulfate resisting Portland cement belongs to a kind of special cement, do not belong to general-purpose cement category, need customized production in advance, market application is very limited.On the other hand, this invention production cost is higher, needs to reduce production cost further.As can be seen here, sulphate attack is one of important factor affecting concrete structure durability, and it is also the one corrosion that influence factor is the most complicated, hazardness is maximum.As a rule, in prior art, sulfate resisting Portland cement only can resist concentration at 2500 below mg/L SO
4 2-corrode, and high sulfate resisting silicate cement also only can resist concentration at 8000 below mg/L SO
4 2-corrode.Opposing concentration can't be solved at 8000 more than mg/L SO in currently available technology
4 2-corrode the problem of existing outwardness, in the urgent need to solving.
Sulfate corrosion-resistant concrete mainly improves concrete performance, the degree of compactness of Concrete Structure by mixing the mode such as adulterant and admixture in coagulation, improves concrete intensity and weather resistance, thus reaches the object of resisting erosion of sulfate.The Sulfate corrosion-resistant concrete that such as patent CN 103030349 A announces and production method thereof, provide the formula that a kind of Sulfate corrosion-resistant concrete comprises cement, slag powders, flyash, stone flour, fine aggregate, coarse aggregate, water and water reducer composition, wherein adulterant has 3 kinds, water reducer volume is larger, cement consumption is very large, and formula is economical not.
The concrete kind of existing resisting erosion of sulfate is a lot, and compound method is also a lot, but technically all there is the technical problem of many reality.One is that the formulation components of prior art is more, and compound method is relatively loaded down with trivial details, and operability is not strong; Two is need in existing Sulfate corrosion-resistant concrete technology to adopt multiple adulterant and multiple additive complex.Admixture is mostly naphthalene system, water-reducing effect is not ideal enough, and do not possess air-entraining function, and most circumstances is the composite of multiple admixture, easily occur the uncompatibility of compound process, cause the internal injury of concrete structure, this type of admixture is meeting mass crystallization when temperature is low, technically there is more defect, do not possess popularity using value; Three is that the relatively high production cost that causes of cement consumption in existing Sulfate corrosion-resistant concrete technological method is higher, does not possess good economy, directly has influence on and apply; Four is that in prior art, sulphate resisting portland cement only can resist concentration at 2500 below mg/L SO
4 2-corrode, and high sulfate-resistant cement also only can resist concentration at 8000 below mg/L SO
4 2-corrode.Opposing concentration can't be solved at 8000 more than mg/L SO in currently available technology
4 2-corrode the problem of existing outwardness.Visible exist many needs technical problem urgently to be resolved hurrily for Sulfate corrosion-resistant concrete technical field at present.
Summary of the invention
Concrete for sulphate-resistant cement preparation in prior art can't solve opposing concentration at 8000 more than mg/L SO
4 2-the objective present situation corroded, and there is many defects and technical barrier urgently to be resolved hurrily in Sulfate corrosion-resistant concrete technical field.The present invention aims to provide a kind of novel high sulfate resisting corrosion concrete and its preparation method and application technical scheme, creativeness provides formula and the preparation technology of novel high sulfate resisting corrosion concrete, reduce recipe ingredient, simplify compound method, reduce preparation cost, solve high sulfate resisting corrosion concrete opposing concentration targetedly at 8000 more than mg/L SO
4 2-corrode, all play good effect by engineer applied, there is practicality and using value widely.
The main technical schemes that the present invention adopts:
By providing novel high sulfate resisting corrosion concrete and compound method thereof, the novel high sulfate resisting corrosion concrete of preparation is according to weight percent meter (%), and novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%.The high sulfate resisting corrosion concrete of preparation is applicable to sulphate attack concentration at 8000 more than mg/L, concrete crushing strength at the concrete works of C20 ~ C40, freeze proof grade F200, seepage-resistant grade W6, and in prior art, the concrete of sulphate-resistant cement preparation can't solve opposing concentration at 8000 more than mg/L SO
4 2-the objective present situation corroded, and there is many defects and technical barrier urgently to be resolved hurrily in Sulfate corrosion-resistant concrete technical field.
The present invention specifically discloses a kind of novel high sulfate resisting corrosion concrete, concrete is added water by cement, slag micropowder, coarse aggregate, fine aggregate, high performance water reducing agent of polyocarboxy acid and stirs preparation and form, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%.
Further, the present invention specifically preferably provides a kind of novel high sulfate resisting corrosion concrete, concrete is added water by cement, slag micropowder, coarse aggregate, fine aggregate, high performance water reducing agent of polyocarboxy acid and stirs preparation and form, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.2%, slag micropowder 5.3%, coarse aggregate 57.4%, fine aggregate 24.5%, high performance water reducing agent of polyocarboxy acid 0.01%, water 4.6%.
In the present invention, required for the novel high sulfate resisting corrosion concrete provided, starting material are the material of common existence on the market, gather materials on the spot conveniently, after science selection formula, with other Sulfate corrosion-resistant concrete, there is significant technical superiority and economical effectiveness.
Further, the invention provides the preparation method of novel high sulfate resisting corrosion concrete, concrete preparation method's step is as follows:
(1) measure according to the quantity of each component ratio of formula, adopt proportioning according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%; Then measured by automatic metering system in employing ready mixed concrete is produced.
(2) high performance water reducing agent of polyocarboxy acid is dropped in the water intending concrete batching and stir, make it to dissolve completely and dispersed.
(3) stir in coarse aggregate, the disposable input stirrer of fine aggregate 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt after then being measured by automatic metering system in employing ready mixed concrete is produced.
(4) stir in cement, the disposable input stirrer of slag micropowder 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt successively after then being measured by automatic metering system in employing ready mixed concrete is produced.
(5) moisture twice input of the plan concrete batching of high performance water reducing agent of polyocarboxy acid will be mixed, at every turn each 50%, first time stirs 10 ~ 15 seconds after dropping into, and second time stirs 30 seconds after dropping into again, discharging can prepare novel high sulfate resisting corrosion concrete.
For more clearly open, describe the present invention in detail from several respects below.
Cement of the present invention is 42.5 grades of P I type silicate cements, does not need to produce sulphate-resistant cement specially, produces and draws materials conveniently.Silicate cement is divided into P I and P II liang of type.P I type silicate cement by 100%(by massfraction) grog and gypsum component form; P II type silicate cement is made up of more than 95% (grog+gypsum) and less than 5% (by massfraction) granulated blast-furnace slag or Wingdale component, and P II type silicate cement is made up of grog and gypsum.The P I type silicate cement that the present invention preferentially selects, and its minimum intensity class 4 of prioritizing selection 2.5 grades, silicate cement strength grade is common is divided into 42.5,42.5R, 52.5,52.5R, 62.5,62.5R totally 6 strength grades.This cement clinker is mainly containing CaO, SiO
2, Al
2o
3, Fe
2o
3raw material, by the levigate burning of suitable proportion to partial melting be able to the hydraulic cement material that Calucium Silicate powder is main mineral constituent.Wherein Calucium Silicate powder mineral content (massfraction) is not less than 66%, and calcium oxide and siliconoxide mass ratio are not less than 2.0.
Further, the final setting time that the silicate cement code name P I that the present invention adopts requires is not more than 390min, and the final setting time that ordinary Portland cement and other cement require is long a lot, is not more than 600min.It should be noted that, the ordinary Portland cement that prior art formula is multiplex greatly, code name PO.It is by 80% ~ 95%(grog+gypsum) and 5% ~ 20%(by massfraction) granulated blast-furnace slag or pozzolana mixed material or flyash component form.
Described high performance water reducing agent of polyocarboxy acid, system uses Molecular Structure Design principle, based on DLVO electrical charge rejection theory and space steric effect theory, under the effect of initiator, produce graft copolymerization by unsaturated monomer, the side chain graft with active group is produced to the technique synthesis on the main chain of polymkeric substance.Be conducive to the workability improving concrete mix, reduce bleeding, main body protective layer can be formed at cement particle surface, produce space steric effect.Improve the concrete performance such as freeze proof, impervious, thus reach the object of opposing high-concentration sulfuric acid salt corrosion.The high performance water reducing agent of polyocarboxy acid that the present invention adopts has low-dosage and is only naphthalene water reducer 1/4 ~ 1/6, high water reducing rate, be generally about 25% ~ 40%, can up to more than 40%, the features such as mobility hold facility is good, no chlorine and low alkali, and there is good air-entraining effect, make concrete 's air-containing reach 3% ~ 6%, normal freeze proof requirement can be met.Therefore the admixture such as air entrapment agent, antifreezing agent component is not needed in novel high sulfate resisting corrosion concrete formula provided by the invention, do not need to take multiple additive complex, simplify schedule of operation, decrease the internal sabotage of additive complex because of the incompatible concrete quality that may cause; And the admixture adopted in art methods is mostly naphthalene system, be calcium lignin sulphonate class on a small quantity, and be that the multiple additive complex such as high efficiency water reducing agent, air entrapment agent uses.
Described coarse aggregate can select continuous grading or two and the collocation of above one-stone grading to use, and nominal maximum aggregate size should not be greater than 40mm.The present invention preferentially selects 5 ~ 20mm and 20 ~ 40mm, two kinds of grades, respectively accounts for 50% when grade is qualified, also can carry out examination according to grade practical situation and join.
Described fine aggregate should adopt grating II district medium sand.
Described concrete water, is conventional tap water or reaches the water of JGJ63 technical requirements.
Novel high sulfate resisting corrosion concrete product provided by the invention draws through serial scientific experiment and is applicable to measure concrete sample under water freezes aqueous fusion condition, with the fast freeze-thaw cycle index stood to represent concrete antifreezing performance.
Novel high sulfate resisting corrosion concrete product provided by the invention meets operative norm " Standard for test methods of longterm performance and durability of ordinary concrete " GB/T50082-2009; Applied code " agent on crack resistance of concrete freeze thawing testing installation " JG/T243-2009, " marine traffic engineering concrete test code " JTJ270-98, " concrete for hydraulic structure testing regulation " DL/T5150-2001; " highway engineering cement and cement concrete testing regulation " JTGE30-2005; " concrete for hydraulic structure testing regulation " SL352-2006; " apparatus for concrete antifreezing test " JG/T243-2009; " standard test methods of concrete fast freeze-thaw ability " U.S. ASTM/C666.
by implementing the concrete technical indicator of the present invention, realizing content of the present invention, following beneficial effect can be reached:
(1) concentration can only be resisted at 2500 below mg/L SO for sulphate resisting portland cement in prior art
4 2-corrode, and common so-called high sulfate-resistant cement also only can resist concentration at 8000 below mg/L SO
4 2-the present situation corroded, the present invention adopts common used material can solve opposing concentration at 8000 more than mg/L even up to the SO of more than 12000mg/L through the novel high sulfur resistive concrete that science is prepared
4 2-corrode, the S0 in the underground water and soil of opposing residing for existing engineering can be covered completely
4 2-concentration, in table 1, therefore the extent of spreading amd application widely.
Table 1: environment actual measurement SO residing for certain engineering
4 2-concentration
-
(2) novel high sulfate resisting corrosion concrete provided by the invention do not need sulphate resisting portland cement only need conventional P I silicate cement can and strength of cement grade is not high, only need 42.5 grades are the minimum intensity grade in P I silicate cement, consumption is less, every cube of concrete cement consumption is minimum only needs 200kg, than cement consumption 360 ~ 450kg in other patented technologies, save material more than 50% ~ 60%.Cement consumption obviously reduces and significantly can reduce production cost, and economic benefit is very remarkable.
(3) novel high sulfate resisting corrosion concrete fusion material provided by the invention is single, only needs slag micropowder instead of common slag powders, requires that slag micropowder specific surface area is at 430m
2/ kg ~ 500 m
2between/kg, draw materials conveniently, and the admixture that similar prior art discloses has three kinds: slag powders, flyash, stone flour.
(4) novel high sulfate resisting corrosion concrete provided by the invention is after experience 200 drying and watering cycles, concrete ultimate compression strength corrosion resistance index is more than 95%, concrete appearance is without considerable change, the production technique of present ready mixed concrete can be met again and transport for a long time simultaneously, meeting the workability requirements such as pumping.Than on the basis that similar patent saves material, performance is better: similar patent concrete is after experience 150 drying and watering cycles, and concrete ultimate compression strength corrosion resistance index is more than 90%.
Embodiment
, for embodiment, the present invention is described below, but the present invention is not limited to following embodiment.
The main raw and auxiliary material adopted and plant and instrument:
The 42.5 grades of P I type silicate cements adopted, its primary chemical index, physical index require as table 1 and table 2; The slag micropowder chemical composition adopted, technical indicator (except specific surface area) must not more than 10% with the measured value deviation in table 4 and table 5, and wherein specific surface area must not be less than 430 m
2/ kg; The coarse aggregate adopted can select continuous grading or two and the collocation of above one-stone grading to use, and nominal maximum aggregate size should not be greater than 40mm, require the measured value deviation examined in all technical and table 6 must not more than 10%; Adopt fine aggregate should adopt grating II district medium sand, require the measured value deviation examined in all technical and table 7 must not more than 10%; The admixture adopted is high performance water reducing agent of polyocarboxy acid; admixture dosage is determined according to specific experiment; by solid volume; usually 0.1% ~ 0.4%; require the measured value deviation examined in all technical and table 3 must not more than 10%; especially its bleed effect is tested, make concrete 's air-containing reach 3% ~ 6%, satisfied normal freeze proof requirement can be guaranteed; Mixing water requires that its quality meets the specification of quality of JGJ63.
Prepare concrete and can adopt concrete mixer and ready mixed concrete stirring station
;concrete cubic compressive strength test specimen, concrete impervious test piece, concrete antifreezing test specimen can adopt concrete cube die trial, concrete impervious testing mold, concrete antifreezing die trial to be prepared respectively; The concrete impervious instrument detecting concrete impermeability comprises the concrete impervious instrument of coventional type and intelligent concrete impervious instrument; The plant and instrument detecting concrete antifreezing performance comprises fast freeze-thaw test machine and refrigerated tank.
The all reagent selected in the present invention and instrument are all well known selecting, but do not limit enforcement of the present invention, and other reagent more well known in the art and equipment are all applicable to the enforcement of the following embodiment of the present invention.
embodiment one: the preparation of novel high sulfate resisting corrosion concrete
Concrete preparation method's step of novel high sulfate resisting corrosion concrete is as follows:
(1) measure according to the quantity of each component ratio of formula, adopt proportioning according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%; Then measured by automatic metering system in employing ready mixed concrete is produced.
(2) high performance water reducing agent of polyocarboxy acid is dropped in the water intending concrete batching and stir, make it to dissolve completely and dispersed.
(3) stir in coarse aggregate, the disposable input stirrer of fine aggregate 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt after then being measured by automatic metering system in employing ready mixed concrete is produced.
(4) stir in cement, the disposable input stirrer of slag micropowder 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt successively after then being measured by automatic metering system in employing ready mixed concrete is produced.
(5) moisture twice input of the plan concrete batching of high performance water reducing agent of polyocarboxy acid will be mixed, at every turn each 50%, first time stirs 10 ~ 15 seconds after dropping into, and second time stirs 30 seconds after dropping into again, discharging can prepare novel high sulfate resisting corrosion concrete.
embodiment two: the preparation of novel high sulfate resisting corrosion concrete
Its raw material comprises the component of following weight proportion, according to a cube consumption 2450kg/m
3assess, novel high sulfate resisting corrosion concrete recipe ingredient is: cement 200, slag micropowder 130, aggregate 2008, high performance water reducing agent of polyocarboxy acid 0.35, water 112; Then measured by automatic metering system in employing ready mixed concrete is produced; High performance water reducing agent of polyocarboxy acid is dropped in the water intending concrete batching and stirs, make it to dissolve completely and dispersed; Stir in coarse aggregate, the disposable input stirrer of fine aggregate 10 ~ 15 seconds; Automatically send in corresponding cabin by conveying belt after then being measured by automatic metering system in employing ready mixed concrete is produced; Stir in cement, the disposable input stirrer of slag micropowder 10 ~ 15 seconds; Automatically send in corresponding cabin by conveying belt successively after then being measured by automatic metering system in employing ready mixed concrete is produced; To moisture twice input of the plan concrete batching of high performance water reducing agent of polyocarboxy acid be mixed, at every turn each 50%, first time drop into after stir 10 ~ 15 seconds, second time stirs 30 seconds after dropping into again, discharging can prepare novel high sulfate resisting corrosion concrete.
embodiment three: the preparation of novel high sulfate resisting corrosion concrete
Novel high sulfate resisting corrosion concrete is added water by cement, slag micropowder, coarse aggregate, fine aggregate, high performance water reducing agent of polyocarboxy acid and stirs preparation and form, its raw material comprises the component of following weight proportion, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%.Concrete preparation method is as follows:
(1) select cement type, and measure by said ratio.
Select 42.5 grades of P I type silicate cements.Cement quality is detected, requires that the measured value deviation in 42.5 grades of P I type silicate cements chemistry, physical index and tables 1 of employing in preparation and table 2 must not more than 10%.
The final setting time that the silicate cement code name P I that the present invention adopts requires is not more than 390min, and the final setting time that ordinary Portland cement and other cement require is long a lot, is not more than 600min.It should be noted that, the ordinary Portland cement that prior art formula is multiplex greatly, code name PO.It is by 80% ~ 95%(grog+gypsum) and 5% ~ 20%(by massfraction) granulated blast-furnace slag or pozzolana mixed material or flyash component form.42.5 grades of P I type silicate cements that the present invention adopts, its primary chemical index, physical index require as table 2 and table 3.
Table 2: chemistry of cement index experimental result
GB175-2007
Table 3: cement physical index experimental result
(2) select slag micropowder, and measure by said ratio.
Select slag micropowder class requirement not high, the lowest class S75 and above grade thereof, its actual density need be asked to be greater than 2.80 g/cm
3, specific surface area is greater than 430m
2/ kg, specific surface area is the parameter characterizing its fineness, embodies the important indicator of its activity index, and therefore it requires far above " GBFS in cement and concrete " (GB/T18046-2008) 300m
2the technical requirements of/kg.Require that the slag micropowder chemical composition of employing in preparation, technical indicator (except specific surface area) must not more than 10% with the measured value deviation in table 4 and table 5, wherein specific surface area must not be less than 430 m
2/ kg.
Described slag micropowder, its chemical composition and technical requirement are in table 4 and table 5.
Table 4: slag micropowder chemical composition assay (%)
| Chemical composition | Loss | SiO 2 | AL 2O 3 | Fe 2O 3 | CaO | MgO | SO 3 | M 2O | K 2O | NaO | Cl - |
| Assay | 1.38 | 36.87 | 10.25 | 1.48 | 39.02 | 9.23 | 2.23 | 0.24 | 0.63 | 1.14 | 0.04 |
Table 5: slag micropowder technical indicator assay
(3) select satisfactory coarse aggregate by testing inspection, and measure by said ratio.
Select coarse aggregate by screening, coarse aggregate can select continuous grading or two and the collocation of above one-stone grading to use, and nominal maximum aggregate size should not be greater than 40mm.The present invention preferentially selects 5 ~ 20mm and 20 ~ 40mm, two kinds of grades, respectively accounts for 50% when grade is qualified, also can carry out examination according to grade practical situation and join.
Detected by chemical analysis and physicals again.Its organic content, mica content, silt content, clod content, saturation plane are done to volume density, water-intake rate etc. and are carried out method detection, require the measured value deviation examined in all technical and table 6 must not more than 10%.
Table 6: the technical feature of coarse aggregate
(4) select satisfactory fine aggregate by testing inspection, and measure by said ratio.
Select fine aggregate to be grating II district medium sand by screening, its technical requirement is as shown in table 7.
Table 7: fine aggregate physical property test result
(5) admixture selected is high performance water reducing agent of polyocarboxy acid, require examine all technical and measured value deviation of the present invention must not more than 10%.Especially its bleed effect is tested, make concrete 's air-containing reach 3% ~ 6%, satisfied normal freeze proof requirement can be guaranteed.Admixture dosage is determined according to specific experiment, by solid volume, usually 0.1% ~ 0.4%.By test determine and the adaptability of cement and the optimum mix amount, require the measured value deviation examined in all technical and table 3 must not more than 10%.
The high performance water reducing agent of polyocarboxy acid that the present invention adopts, its main homogeneity index request is as table 8.
Table 8: the main homogeneity index of high performance water reducing agent of polyocarboxy acid
(6) mixing water
Described mixing water, is conventional tap water or reaches the water of JGJ63 technical requirements.
(7) high performance water reducing agent of polyocarboxy acid is dropped in the water intending concrete batching and stir, make it to dissolve completely and dispersed.
(8) coarse aggregate, fine aggregate are dropped in stirrer and stir 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt after then being measured by automatic metering system in employing ready mixed concrete is produced.
(9) stir in cement, the disposable input stirrer of slag micropowder 10 ~ 15 seconds; Automatically sent in corresponding cabin by conveying belt successively after then being measured by automatic metering system in employing ready mixed concrete is produced.
(10) will moisture twice input of the plan concrete batching of high performance water reducing agent of polyocarboxy acid be mixed, at every turn each 50%, first time drop into after stir 10 ~ 15 seconds, second time stirs 30 seconds after dropping into again, gets final product discharging.This material is the high sulfate resisting corrosion concrete of preparation.
embodiment four: the formula of novel high sulfate resisting corrosion concrete
The invention provides novel high sulfate resisting corrosion concrete, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.162%, slag micropowder 5.305%, coarse aggregate 57.380%, fine aggregate 24.568, high performance water reducing agent of polyocarboxy acid 0.014%, water 4.571%.Wherein, cement is 42.5 grades of P I type silicate cements.Cement quality is detected, requires that the measured value deviation in 42.5 grades of P I type silicate cements chemistry, physical index and tables 1 of employing in preparation and table 2 must not more than 10%.Slag micropowder requires that its actual density is greater than 2.80 g/cm
3, specific surface area is greater than 430m
2/ kg.Aggregate is divided into slightly, fine aggregate 2 kinds, is graduation two: 5 ~ 20mm:20 ~ 40mm.Require its organic content, mica content, silt content, clod content, the technical indicator such as volume density, water-intake rate is done in saturation plane and measured value deviation in table 6 and table 7 must not more than 10%.High performance water reducing agent of polyocarboxy acid water-reducing rate more than 30%, and has bleed effect, and guarantees to make concrete 's air-containing reach 3 ~ 6%.
embodiment five: the optimal screening of novel high sulfate resisting corrosion concrete formula
The present embodiment is exactly determine the source of novel high sulfate resisting corrosion concrete provided by the invention formula, foundation and concrete consumption by test.Through various testing inspection, calculating, analysis and optimal screening, finally determine that component, proportioning, consumption are as follows:
Concrete is added water by cement, slag micropowder, coarse aggregate, fine aggregate, high performance water reducing agent of polyocarboxy acid and stirs preparation and form, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%.
Further, the present invention specifically preferably provides a kind of novel high sulfate resisting corrosion concrete formula, according to weight percent meter (%), cement 8.2%, slag micropowder 5.3%, coarse aggregate 57.4%, fine aggregate 24.5%, high performance water reducing agent of polyocarboxy acid 0.01%, water 4.6%.
The optimal screening process of concrete formula is as follows:
(1) concrete preparation strength is calculated
According to
f cu, o=
f cu, k + tσ calculates
In formula:
f cu, o----concrete preparation strength (MPa)
f cu, kthe strength standard value (MPa) in-Concrete Design length of time
t-degree of probability coefficient is 95% according to design strength fraction,
Get
t=1.645
σ-concrete strength standard deviation, σ value is specifically in table 9.
Concrete preparation strength can be calculated according to above formula
f cu, ovalue is in table 9.
Table 9: design strength and preparation strength table look-up
Upper table is only and provides scope of embodiments, and strength grade comprises above-mentioned rate range and is not limited only to this scope, can extend to strength grade scope beyond table.
(2) concrete water (glue) gray scale calculating with determine
Concrete water (glue) gray scale is as the criterion with the ratio of concrete unit consumption of water to gel material content of aggregate under saturated dry surface, and concrete water-cement ratio must meet concrete intensity and life requirement simultaneously.
1. water-cement ratio W/(C+K is selected by requirement of strength)
Determine water-cement ratio according to the following formula:
W/（C+K）=
f b /（
f cu,o + f b ）
In formula:
f cu, o----concrete preparation strength (MPa)
f b-gelling material 28d cement mortar strength (MPa)
-regression coefficient, when aggregate is rubble
=0.53
=0.20
The slag micropowder that mineral admixture adopts,
f bvalue can be calculated as follows:
f b=1.1γ
s·
f ce,g
In formula: γ
s-slag micropowder influence coefficient, in table 10
f ce, g-strength of cement grade point (MPa)
Table 10: slag micropowder influence coefficient
| Volume (%) | Influence coefficient |
| 0 | 1.00 |
| 10 | 1.00 |
| 20 | 0.95～1.00 |
| 30 | 0.90～1.00 |
| 40 | 0.80～0.90 |
| 50 | 0.70～0.85 |
Therefore
f b=1.1 γ
s.
f ce, g=1.1*0.70*42.5=32.7(MPa).
Water-cement ratio that this concrete meets the demands can be calculated in table 11 according to water-cement ratio calculation formula.
Table 11: strength grade and water-cement ratio table look-up
| Strength grade | C20 | C25 | C30 | C35 | C40 |
| Water-cement ratio W/(C+K) | 0.57 | 0.47 | 0.42 | 0.37 | 0.34 |
From upper table 11, the water-cement ratio that this concrete meets requirement of strength must not be greater than 0.34.Upper table is only and provides scope of embodiments, and strength grade comprises above-mentioned rate range and is not limited only to this scope, can extend to strength grade scope beyond table.Therefore, water-cement ratio is also not limited only to table scope, along with the change of strength grade can change thereupon.
2. water-cement ratio W/(C+K is determined by freeze proof requirement)
When being F200 according to concrete antifreezing grade, the water-cement ratio determined according to the rules must not be greater than 0.45.
3. seepage resistance demand determination water-cement ratio W/(C+K is pressed)
When being W6 according to concrete impervious grade, the water-cement ratio determined according to the rules must not be greater than 0.55.
Require higher (F200) according to relevant works concrete durability and require Concrete Resist Reinforcing Sulfate Corrosion, water-cement ratio is no more than 0.34, therefore, trial mix proportioning water-cement ratio with 0.34 for benchmark, other two water-cement ratios should increase on this basis and reduce 0.05, therefore design employing three water-cement ratios, be respectively 0.39,0.34,0.29.Through verification experimental verification, water-cement ratio is advisable with 0.34.
(3) sand coarse aggregate ratio selection and determine
Be 0.34 be less than 0.40 according to aggregate classification (natural pebble) and water-cement ratio, select sand coarse aggregate ratio scope to be 24% ~ 30%, because fine aggregate is medium sand, sand coarse aggregate ratio can be chosen to be 27%, if artificial sand preparation can suitably increase.If rubble, select sand coarse aggregate ratio scope to be 27% ~ 32%, because fine aggregate is medium sand, sand coarse aggregate ratio can be chosen to be 30%.Comprehensive each factor, sand coarse aggregate ratio is defined as 30%.
(4) each component screening and quantity are determined
1. the specification of quality of concrete mixing water and quantity are determined
Concrete mixing water is normal drinking water, and water quality is better, meets the technical requirements in JGJ63.During any admixture of non-admixture, by testing the concrete mixing water consumption determined in table 12.
Table 12: concrete mixing water consumption (kg/m
3)
Foundation coarse aggregate is natural pebble, its maximum particle diameter 40mm and the slump 30 ~ 50mm required for common structure component, every cube of water consumption is 160kg, calculate according to the water-reducing rate 25% ~ 40% of admixture, actual used water amount after mixing admixture is 96 ~ 120 kg, comprehensive various factors impact, preferred water consumption is that 112 kg(are equivalent to according to 30% water-reducing effect calculated value).
2. the specification of quality of cement and quantity are determined
Cement used of the present invention, preferentially selects 42.5 grades of P I type silicate cements by testing.For in P I type silicate cement in present GB 175-2007 " general purpose portland cement " minimum intensity grade (P I type silicate cement strength grade is divided into 42.5,42.5R, 52.5,52.5R, 62.5,62.5R totally 6 strength grades).Through inspection, chemistry, physical index meet the technical indicator that GB175-2007 " general purpose portland cement " requires.Detected result is in table 1 and table 2.For guaranteeing that the present invention has opposing concentration at 8000 more than mg/L SO
4 2-the effect corroded, requires that the measured value deviation in 42.5 grades of P I type silicate cements chemistry, physical index and tables 1 of employing in preparation and table 2 must not more than 10%.
The calculating of cement consumption is determined:
Water-cement ratio W/(C+K)=0.34, water W=112kg, therefore gelling material (C+K)=329 kg, get 330 kg, at water-cement ratio W/(C+K)=0.34≤0.45 time meet the requirement of the minimum gelling material of concrete.
Slag micropowder can according to 55% ~ 65% volume, therefore the amount ranges of cement is 200 ~ 213kg.Under the prerequisite ensureing concrete quality, for cost-saving, can take to keep binder total amount constant, get the upper limit of slag micropowder consumption, get the lower limit of cement consumption.Therefore cement optimum amount is defined as 200 kg.
3. the specification of quality of admixture and quantity are determined
The high performance water reducing agent of polyocarboxy acid of one-component selected by admixture, because its water-reducing rate is extra-high, be generally about 25% ~ 40%, and there is air-entraining effect, make concrete 's air-containing reach 3% ~ 6%, normal freeze proof requirement can be met, therefore the component of air entrapment agent is not needed in formula, do not need to take multiple additive complex, simplify schedule of operation, decrease the internal sabotage of additive complex because of the incompatible concrete quality that may cause.Admixture dosage is determined according to specific experiment, by solid volume, usually 0.1% ~ 0.4%, is only 15% ~ 25% of naphthalene water reducer.Admixture requires the homogeneity requirement reaching table 3.
The calculating of additive usage with determine: by solid volume, usually 0.1% ~ 0.4%, therefore additive usage is 330*(0.1% ~ 0.4%) ﹦ 0.31 ~ 1.23kg, get 0.35 kg.
4. the specification of quality of slag micropowder and quantity are determined
Slag micropowder class requirement is not high, the lowest class S75 level and above grade thereof, and its actual density need be asked to be greater than 2.80 g/cm
3, specific surface area is greater than 430m
2/ kg, specific surface area is the parameter characterizing its fineness, embodies the important indicator of its activity index, and therefore it requires far above " GBFS in cement and concrete " (GB/T18046-2008) 300m
2the technical requirements of/kg.Its chemical composition and other technical indicators should reach the requirement of table 2 of the present invention and table 3 respectively.For guaranteeing effect of the present invention, require that the slag micropowder chemical composition of employing in preparation, technical indicator (except specific surface area) must not more than 10% with the measured value deviation in table 4 and table 5, wherein specific surface area must not be less than 430 m
2/ kg.
The calculating of slag micropowder consumption with determine: binder total amount is 330kg, under the prerequisite ensureing concrete quality, for cost-saving, can take to keep binder total amount constant, get the lower limit of cement consumption, get the upper limit of slag micropowder consumption.Lower limit 200 kg of cement consumption, therefore that slag micropowder consumption is 330-200=130kg.
5. the specification of quality of coarse aggregate and quantity are determined
This project coarse aggregate system used imam mouth stock ground natural aggregate, be scleroid natural pebble, impurity is less, and according to " concrete construction specification " (DL/5144-2001) inspection, its assay is in table 6.From assay, all technical that coarse aggregate is examined in this stock ground all meets code requirement.This test adopt the stone of size fractionated to be graduation two: 5 ~ 20mm:20 ~ 40mm=50%:50%.For guaranteeing effect of the present invention, require that the measured value deviation in the coarse aggregate technical feature of employing in preparation and table 6 must not more than 10%.
Calculate according to sand coarse aggregate ratio 30%, coarse aggregate is 1406kg.
6. the specification of quality of fine aggregate and quantity are determined
Fine aggregate requires that its physical performance index should reach the requirement of table 7 for nature medium sand.For guaranteeing effect of the present invention, require that the measured value deviation in the fine aggregate physicals of employing in preparation and table 7 must not more than 10%.
Calculate according to sand coarse aggregate ratio 30%, fine aggregate is 602kg.
(5) air content is determined
When requiring concrete freeze proof grade to be F200, its air content is (5.5 ± 1) %., high performance water reducing agent of polyocarboxy acid can make concrete 's air-containing reach this requirement.
(6) concrete mix is determined
By the concrete mix tentatively determined above, draw the concrete mix of economical rationality through trial mix adjustment.
(7) concrete mix is checked
Make test specimen by the concrete mix determined, in hydrostatic, maintenance is to specifying the length of time, carries out concrete crushing strength, the freeze proof performance test such as impervious, to check the reasonableness of concrete mix.
(8) concrete mix is recommended
According to ultimate compression strength, freeze proof, impermeability test result after the property indices of concrete batching system, concrete hardening, analyze through comprehensive, recommend water cement ratio less, the concrete mix that cement consumption is less is selected for producing (construction) unit reference as recommendation concrete mix.
conclusion:comprise the component of following weight proportion according to above-mentioned novel its raw material of high sulfate resisting corrosion concrete: according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%; Novel high sulfate resisting corrosion concrete screening formulation is, cement 8.2%, slag micropowder 5.3%, coarse aggregate 57.4%, fine aggregate 24.5%, high performance water reducing agent of polyocarboxy acid 0.01%, water 4.6%.Through verification experimental verification, ultimate compression strength after the property indices of concrete batching system, concrete hardening, freeze proof, impermeability test result all meet relevant art requirement, can be used as sulfate concentration in the erosion of 8000 more than mg/L, ultimate compression strength at the concrete works of C20 ~ C40, freeze proof grade F200, seepage-resistant grade W6.
embodiment six: the antifreezing test of novel high sulfate resisting corrosion concrete
The present embodiment is exactly determine that novel high sulfate resisting corrosion concrete provided by the invention has good anti-freezing property by test.Antifreezing test can adopt method of freezing slowly and quick-freeze method.
Slowly method of freezing adopts cube specimen, and the maximum particle diameter according to aggregate selects test specimen, and general maximum particle diameter is no more than the test specimen selecting 100*100*100mm of 31.5mm.
Required test specimen group number is selected according to freezing-thawing cycles (frost-resistance grade).D25, D50 are 3 groups of test specimens, and 12 liters (best 15 liters), D100, D150, D200, D250, D300 are 5 groups of test specimens, 18 liters.Curing condition: 20 ± 2 DEG C, humidity is greater than 90%.As without particular requirement, freeze thawing test specimen should be tested the 28 day length of time, and one is within 4 days, freeze thawing test specimen should be taken out from maintenance place before the test, put into 15 ~ 20 DEG C of water after visual inspection to soak, take out after 4 days, wipe examination surface-moisture, weigh, number after insert frame basket and put into refrigerated tank.Two is that refrigerated tank should remain on-15 DEG C ~-20 DEG C.Test specimen is put into when the temperature inside the box reaches-20 DEG C, and calculates freeze-off time from refrigerator temperature lower than when-15 DEG C, and freeze-off time 100mm test specimen is 4 hours.Three is put into the tank that water temperature can remain on 15 DEG C ~ 20 DEG C after having frozen, 4 hours time, and this is a circulation.Often should carry out visual inspection to freeze thawing test specimen during test, should weigh when finding that there is havoc, if rate of weight loss is more than 5%, test can be stopped.Namely compressive strength test is carried out after completing freezing-thawing cycles.
The present embodiment adopts the concrete antifreezing test specimen of invention formula preparation 100*100*400, adopts common concrete KDR-A3 type fast freeze-thaw test machine to carry out freezing and thawing test.Require 2.5 ~ 4 hours freeze-thaw cycle cycles, the thawing time is not less than 1/4 freeze-thaw cycle, freezes at the end test specimen core temperature-18 ± 2 DEG C, melts at the end test specimen core temperature 5 ± 2 DEG C, temperature fall time 1.5 ~ 2.5 hours, 1.5 ~ 2.5 hours heating-up times.Concrete test adopts quick-freeze method to carry out, and every 3 test specimens of concrete sample adopting 100*100*400mm are one group (namely same formula makees 3 groups of test specimens).Standard concrete test specimen is placed in rubber tube with water soaking, then the rubber that test specimen and water are housed is arranged in examination case, makes circulatory mediator with secondary refrigerant, periodically the water layer around test specimen is freezed, melted.Concrete freeze-thaw cycle machine, every the loss of 25 concrete dynamics modulus of elasticity of cycle detection and quality.By measuring concrete sample under water freezes aqueous fusion condition, with the fast freeze-thaw cycle index stood to represent concrete antifreezing performance.Its test-results is in table 13.
Table 13: concrete antifreezing test-results
From upper table 13, during freeze-thaw cycle 200 times, concrete weight loss and Determination of Dynamic Elastic Modulus are all within the scope of code requirement.Should be appreciated that the quick-freeze method that specific embodiment herein describes and instrument and model thereof only illustrate in order to explain, be not intended to limit the present invention.Such as freeze method slowly also all can adopt with other pertinent instruments, therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Conclusion: reach a conclusion according to above-mentioned experimental verification, during freeze-thaw cycle 200 times, concrete weight loss and Determination of Dynamic Elastic Modulus are all within the scope of code requirement.Namely novel high sulfate resisting corrosion concrete provided by the invention has good anti-freezing property.
embodiment seven: the impermeability test of novel high sulfate resisting corrosion concrete
The present embodiment be exactly by test determine that novel high sulfate resisting corrosion concrete provided by the invention has good anti-permeability performance.
Concrete Design seepage-resistant grade is W6, tests according to the test method of regulation in " concrete for hydraulic structure testing regulation " (DL/T5150-2001).Adopt common concrete impervious instrument, die trial inwall smeared one deck barrier coat, 6 impervious test pieces are respectively charged into die trial and are placed on concrete impervious instrument, according to the rules successively pressurization carry out experimental observation test specimen whether occur seep water phenomenon.Test-results shows, when pressure adds to 1.0MPa, the phenomenon that seeps water all does not appear in 6 test specimens.Test specimen inspection of riving finds, infiltration highly only has 3 ~ 5cm, illustrates that concrete impermeability is good, can guarantee that concrete impervious grade is greater than W6.
Conclusion: adopt concrete impervious instrument to carry out impervious experimental verification according to pressurizeing successively according to the rules, test-results shows, when pressure adds to 1.0MPa, the phenomenon that seeps water all does not appear in 6 test specimens.Namely novel high sulfate resisting corrosion concrete provided by the invention has good anti-permeability performance.
embodiment eight: the drying and watering cycle experimental verification of novel high sulfate resisting corrosion concrete
Present embodiments provide the drying and watering cycle experimentation of novel high sulfate resisting corrosion concrete, be specifically described as follows: adopt above-mentioned concrete mix, make test specimen respectively, and as the starting point studied, above-mentioned concrete mix is applied on layer of structure, by the metabisulfite solution accelerated test adopting pure sodium sulfate powder to prepare 5% and 10% two kind of concentration, resistance to vitriol experiment is carried out to it.The index such as ultimate compression strength, quality change before and after the concrete sample corrosion of corroding by metabisulfite solution is evaluated.Carried out Experimental Comparison to the concrete and blank test specimen that mix slag micropowder, and carried out the test of ultimate compression strength, folding strength, result shows: compared with blank test specimen, mix slag micropowder test specimen resisting erosion of sulfate ability significantly strengthen.Under each soaks the length of time, in 10% metabisulfite solution, the mass change of test specimen does not have obvious rule., tested by scanning electron microscope meanwhile, can microanalysis and discussion be carried out to the anti-erosion of concrete of different mixture ratio.Measured by indices such as the bearing capacity changes before and after the load-deflection curves to concrete structure after metabisulfite solution corrosion, cracking load, ultimate bearing capacity and corrosion, draw the affecting laws of corrosion to performances such as the cracking load of concrete structure and bend-carrying capacity.And to be wet circulation experiment by concrete dry, after novel high sulfate resisting corrosion concrete provided by the invention experiences 200 drying and watering cycles, concrete ultimate compression strength corrosion resistance index is more than 95%, concrete appearance is without considerable change, the production technique of present ready mixed concrete can be met again and transport for a long time simultaneously, meeting the workability requirements such as pumping.Than on the basis that similar patent saves material, performance is better: similar patent concrete is after experience 150 drying and watering cycles, and concrete ultimate compression strength corrosion resistance index is more than 90%.
Conclusion: by concrete dry wet circulation experiment checking, novel high sulfate resisting corrosion concrete provided by the invention has good sulphate-corrosion resistance energy.
embodiment nine: the test effect evaluation of novel high sulfate resisting corrosion concrete
1. experimental study object
This experimental study is higher based on engineering present position ground water table, and vitriol is done the serious practical situation of concrete erosion.Sulphate attack is one of important factor affecting concrete structure durability, and it is also the one corrosion that influence factor is the most complicated, hazardness is maximum.This research is started with from its preparing materials aspect, carries out drying and watering cycle, according to ultimate compression strength and quality two indices, draw the concrete mix experimental study that sulphate-corrosion resistance can be best to the performance that concrete opposing sulfuric acid corrodes.In order to improve the performance that concrete opposing sulfuric acid corrodes, can admixture superfined flyash and slag micropowder in concrete, prepare high performance concrete.Therefore prepare this concrete time must in concrete admixture mineral admixture, in this engineering, we pay the utmost attention to participation slag micropowder, with reach opposing sulfuric acid corrode object.
2. experimental study background, method, process and achievement
2.1 experimental study backgrounds
Tarimhe River comprehensive management engineering battle line is long, its design discharge and year conveyance power of water large, engineering project builds up input, can solve productions, domestic water, can become the water delivery Aorta of recovery Green Corridor In The Lower Reaches of Tarim River simultaneously.Tarimhe River each reclamation area along the line, engineering present position ground water table is higher, and vitriol is to concrete erosion serious (be shown in table 8), and soil property is based on aeolian sand, silt and Gobi desert soil, and swelling soil is more.
As a rule, middle sulphate resisting portland cement only can resist concentration at 2500 below mg/L SO
4 2-corrode, and high sulfate-resistant cement also only can resist concentration at 8000 below mg/L SO
4 2-corrode.In view of engineering-environment vitriol is to the serious present situation of concrete erosion, for solving this actual techniques difficult problem, therefore develop the problem needs that high performance concrete or high sulfate resisting corrosion concrete just become a reality.
The requirement of the Engineering Anti sulphate attacks such as power station, sweat Usu is examined for solving Tarimhe River comprehensive regulation part engineering bridge bridges and culverts, Sayram Lake road that circles the lake Partial Bridges bridges and culverts, system in Tahe Oilfield flood control project, pumping plant water delivery trunk canal, Bosten east, Kongquehe dredging work and state's electricity, a kind of high performance concrete or high sulfate resisting corrosion concrete must be provided, concentration can be resisted at 8000 more than mg/L SO
4 2-corrode.And need to determine that the novel high sulfate resisting corrosion concrete provided can meet corresponding quality requirement through overtesting.
First, by mixing different ratios slag micropowder, high efficiency water reducing agent prepared be applicable to high sulfate resisting corrode high performance concrete, and the test method of concrete durability is devised for Tahe comprehensive management engineering physical environment feature: the experimental technique adopting drying and watering cycle in the sulfate liquor of drying and watering cycle in water, two kinds of different concns, study Sulfate Resistance of Concrete by quality index such as test ultimate compression strength, folding strength etc.Result of study shows: compared with blank test specimen, and when high performance concrete reaches about 140d the length of time, its resisting erosion of sulfate ability is strong, and the amplitude simultaneously changed along with the increase quality percentage of the age of concrete is little.Under each soaks the length of time, in 10% metabisulfite solution, the mass change of test specimen does not have obvious rule.Concrete drying and watering cycle weather resistance degradation speed in salts solution is faster than drying and watering cycle in water, along with the increase weather resistance degradation speed of sulfate concentration in salts solution is accelerated, evaluate the more harsh harshness of Concrete Resist Reinforcing Sulfate Corrosion weather resistance with cyclic wetting and drying test in salts solution, evaluation result is more reliable.The concrete of this test, using the slag micropowder of eight steel mills as Additive research experiment, adopts high performance concrete to achieve high sulfate resisting erosion performance, ensure that concrete weather resistance under the condition of regular tenacity grade.
3. test effect evaluation
From practical effect, be completed more than 10 years of use till now from Xinjiang Tarim River comprehensive management engineering from completion engineering the earliest originally, its concrete strength and workability meet the demands completely, and demonstrate the high performance concrete that different ratios slag micropowder is mixed in employing, high efficiency water reducing agent is prepared is successful in the environment of opposing high-sulfate erosion.
The present invention summing up the experience of this high performance concrete, in order to proportioning is more scientific, better effects if.8 original components being simplified is 5 components, original ordinary Portland cement (code name PO) is replaced with performance better by 100%(grog+gypsum) component forms silicate cement (code name P I), cement consumption reduces 10 ~ 20%, reduce further production cost.Admixture is changed into the one-component high performance water reducing agent of polyocarboxy acid that performance is more superior, examine power station, sweat Usu etc. according to the new formula by being optimized at Tarimhe River comprehensive regulation later stage engineering, Sayram Lake road that circles the lake Partial Bridges bridges and culverts, system in Tahe Oilfield flood control project, pumping plant water delivery trunk canal, Bosten east, Kongquehe dredging work and state's electricity to widely apply, the high sulfate resisting corrosion concrete demonstrating formulated of the present invention is practicable at concrete resisting erosion of sulfate.
By enforcement and the checking of above-mentioned series embodiment, as can be seen here, the method that the present invention is recorded by Sulfate corrosion-resistant concrete this area in the above-mentioned novel high sulfate resisting corrosion concrete component provided and formula and prior art and disclosed all has substantial variation, the following several respects of angle analysis major embodiment from large:
One, in existing compounding process method, cement adopts sulphate-resistant cement or ordinary Portland cement, and sulphate-resistant cement is divided into middle sulphate resisting portland cement, code name PMSR; High sulfate-resistant cement and code name PMSR, and ordinary Portland cement common be code name PO, the present invention adopts P I type (code name P I) in common silicate cement, and only need minimum intensity class 4 2.5 grades, well known silicate cement strength grade is divided into 42.5,42.5R, 52.5,52.5R, 62.5,62.5R totally 6 strength grades.Novel high sulfate resisting corrosion concrete provided by the invention does not need to adopt special middle sulphate resisting portland cement, code name PMSR; The sulphate-resistant cement of high sulfate-resistant cement, code name PMSR and ordinary Portland cement (code name PO).
Its two, in existing compounding process method, admixture is high efficiency water reducing agent and the air entrapment agent combined addition of naphthalene system mostly, and the admixture component that novel high sulfate resisting corrosion concrete of the present invention adopts is single, is only HL-1 type high performance water reducing agent of polyocarboxy acid.This type water reducer system uses Molecular Structure Design principle, based on DLVO electrical charge rejection theory and space steric effect theory, under the effect of initiator, produce graft copolymerization by unsaturated monomer, the side chain graft with active group is produced to the technique synthesis on the main chain of polymkeric substance.The admixture that novel high sulfate resisting corrosion concrete provided by the invention adopts is only single HL-1 type high performance water reducing agent of polyocarboxy acid; be conducive to the workability improving concrete mix; reduce bleeding; main body protective layer can be formed at cement particle surface; produce space steric effect; improve the concrete performance such as freeze proof, impervious, thus reach the object of opposing high density resisting erosion of sulfate.Owing to being only naphthalene water reducer 1/4 ~ 1/6, it has low-dosage; High water reducing rate, is generally about 25% ~ 40%, can up to more than 40%; The features such as mobility hold facility is good, no chlorine and low alkali; And there is good air-entraining effect, concrete 's air-containing is made to reach 3% ~ 6%, normal freeze proof requirement can be met, therefore the admixture such as air entrapment agent, antifreezing agent component is not needed in formula, do not need to take multiple additive complex, simplify schedule of operation, decrease the internal sabotage of additive complex because of the incompatible concrete quality that may cause.
Its three, the adulterant that novel high sulfate resisting corrosion concrete of the present invention adopts is single, and being only slag micropowder one, is a kind of common steel-making waste product, facility of gathering materials on the spot.
Its four, compound method is flexible, and according to the water status of on-the-spot material, various material dry density quality or saturated dry surface can be adopted to control, for easy to operate, the present invention adopts dry density quality according to component cube consumption kg/m
3assess and control.
The novel high sulfate resisting corrosion concrete that the present invention relates to compared with prior art has following outstanding advantages and significant technical progress:
One is that formulation components is less, and method is relatively simple, workable, applied widely, all kinds of engineering such as applicable building, highway, water conservancy, oil field, airport.
Two is that admixture adopts high performance water reducing agent of polyocarboxy acid, has the feature such as low-dosage (being only 1/4 ~ 1/6 of naphthalene water reducer), high water reducing rate (can reach more than 40%), mobility hold facility is good, low temperature is non-crystallizable, no chlorine and low alkali.And there is good air-entraining effect (concrete 's air-containing can be made to reach 3% ~ 6%), normal freeze proof requirement can be met.
Three is that cement consumption is relatively low, can significantly reduce concrete production cost, possess preferably economy.
Further, high sulfate resisting corrosion concrete of the present invention can be widely used in the oceanographic engineering of southeastern coast each province of China further.For raising oceanographic engineering and the concrete quality of resistant to corrosion, extend concrete work-ing life, there is significant technology, economic and social benefit.
Above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And apparent change extended thus or variation are still among protection scope of the present invention.
Claims (3)
1. a novel high sulfate resisting corrosion concrete, concrete is added water by cement, slag micropowder, coarse aggregate, fine aggregate, high performance water reducing agent of polyocarboxy acid and stirs preparation and form, it is characterized in that, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%.
2. a novel high sulfate resisting corrosion concrete as claimed in claim 1, it is characterized in that, according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.2%, slag micropowder 5.3%, coarse aggregate 57.4%, fine aggregate 24.5%, high performance water reducing agent of polyocarboxy acid 0.01%, water 4.6%.
3. a preparation method for novel high sulfate resisting corrosion concrete as claimed in claim 1, concrete preparation method's step is as follows:
(1) measure according to the quantity of each component ratio of formula, adopt proportioning according to weight percent meter (%), novel high sulfate resisting corrosion concrete recipe ingredient is: cement 8.0-8.4%, slag micropowder 5.1-5.5%, coarse aggregate 56-58%, fine aggregate 24-26%, high performance water reducing agent of polyocarboxy acid 0.01-0.03%, water 4.5-6.0%; Then measured by automatic metering system in employing ready mixed concrete is produced;
(2) high performance water reducing agent of polyocarboxy acid is dropped in the water intending concrete batching and stir, make it to dissolve completely and dispersed;
(3) stir in coarse aggregate, the disposable input stirrer of fine aggregate 10 ~ 15 seconds; Automatically send in corresponding cabin by conveying belt after then being measured by automatic metering system in employing ready mixed concrete is produced;
(4) stir in cement, the disposable input stirrer of slag micropowder 10 ~ 15 seconds; Automatically send in corresponding cabin by conveying belt successively after then being measured by automatic metering system in employing ready mixed concrete is produced;
(5) moisture twice input of the plan concrete batching of high performance water reducing agent of polyocarboxy acid will be mixed, at every turn each 50%, first time stirs 10 ~ 15 seconds after dropping into, and second time stirs 30 seconds after dropping into again, discharging can prepare novel high sulfate resisting corrosion concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658945.2A CN104446194A (en) | 2014-11-18 | 2014-11-18 | Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658945.2A CN104446194A (en) | 2014-11-18 | 2014-11-18 | Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104446194A true CN104446194A (en) | 2015-03-25 |
Family
ID=52893044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410658945.2A Pending CN104446194A (en) | 2014-11-18 | 2014-11-18 | Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104446194A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226225A (en) * | 2016-07-01 | 2016-12-14 | 武汉理工大学 | A kind of evaluate the concrete method by acid-rain corrosion degree |
| CN106542751A (en) * | 2016-11-26 | 2017-03-29 | 烟台大学 | A kind of sulfate-resistant cement and its production method |
| CN106747126A (en) * | 2017-02-20 | 2017-05-31 | 内蒙古科技大学 | A kind of slag concrete of anti-sulfur dioxide corrosion |
| CN108101489A (en) * | 2017-12-23 | 2018-06-01 | 季梅 | Good concrete of a kind of Sulfate corrosion resistance energy and preparation method thereof |
| CN111233389A (en) * | 2020-01-09 | 2020-06-05 | 国核示范电站有限责任公司 | Concrete for nuclear power station |
| CN113173752A (en) * | 2021-04-07 | 2021-07-27 | 长泰县华信混凝土有限公司 | Preparation method of durable concrete for bridge pouring |
| CN115059049A (en) * | 2022-06-28 | 2022-09-16 | 中交第三航务工程局有限公司 | Application of quick-drying cement in frozen soil grouting and grouting method containing application |
| CN115180863A (en) * | 2022-08-03 | 2022-10-14 | 四川沿江宜金高速公路有限公司 | Method for preventing and controlling concrete sulfate erosion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200951601Y (en) * | 2006-07-04 | 2007-09-26 | 宋斌 | Continuous feeding type intermittent concrete mixed building |
| CN103030349A (en) * | 2013-01-07 | 2013-04-10 | 上海建工材料工程有限公司 | Sulfate corrosion-resistant concrete and production method thereof |
-
2014
- 2014-11-18 CN CN201410658945.2A patent/CN104446194A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200951601Y (en) * | 2006-07-04 | 2007-09-26 | 宋斌 | Continuous feeding type intermittent concrete mixed building |
| CN103030349A (en) * | 2013-01-07 | 2013-04-10 | 上海建工材料工程有限公司 | Sulfate corrosion-resistant concrete and production method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 冷发光等: "《混凝土耐久性及其检验评价方法》", 30 April 2012, 中国建材工业出版社 * |
| 宋少民等: "《混凝土学》", 31 December 2013, 武汉理工大学出版社 * |
| 王凤喜等: "《混凝土设备结构原理与维修》", 31 July 2012, 机械工业出版社 * |
| 王文明等: "掺矿渣微粉高性能混凝土试验研究", 《建筑技术开发》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226225A (en) * | 2016-07-01 | 2016-12-14 | 武汉理工大学 | A kind of evaluate the concrete method by acid-rain corrosion degree |
| CN106226225B (en) * | 2016-07-01 | 2019-03-08 | 武汉理工大学 | A method of evaluation concrete is by acid-rain corrosion degree |
| CN106542751A (en) * | 2016-11-26 | 2017-03-29 | 烟台大学 | A kind of sulfate-resistant cement and its production method |
| CN106542751B (en) * | 2016-11-26 | 2019-02-26 | 烟台大学 | A kind of sulfate-resistant cement and its production method |
| CN106747126A (en) * | 2017-02-20 | 2017-05-31 | 内蒙古科技大学 | A kind of slag concrete of anti-sulfur dioxide corrosion |
| CN108101489A (en) * | 2017-12-23 | 2018-06-01 | 季梅 | Good concrete of a kind of Sulfate corrosion resistance energy and preparation method thereof |
| CN111233389A (en) * | 2020-01-09 | 2020-06-05 | 国核示范电站有限责任公司 | Concrete for nuclear power station |
| CN113173752A (en) * | 2021-04-07 | 2021-07-27 | 长泰县华信混凝土有限公司 | Preparation method of durable concrete for bridge pouring |
| CN115059049A (en) * | 2022-06-28 | 2022-09-16 | 中交第三航务工程局有限公司 | Application of quick-drying cement in frozen soil grouting and grouting method containing application |
| CN115180863A (en) * | 2022-08-03 | 2022-10-14 | 四川沿江宜金高速公路有限公司 | Method for preventing and controlling concrete sulfate erosion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104446194A (en) | Novel concrete highly resistant to sulfate attack as well as preparation method and application of novel concrete | |
| Liu et al. | Effects of w/b ratio, fly ash, limestone calcined clay, seawater and sea-sand on workability, mechanical properties, drying shrinkage behavior and micro-structural characteristics of concrete | |
| CN102320775B (en) | Seawater corrosion resisting mineral additive for concrete, and preparation method thereof | |
| Rajamane et al. | Sulphate resistance and eco-friendliness of geopolymer concretes | |
| CN103253921B (en) | Cement concrete preventing corrosion of chlorine salt and preparation method thereof | |
| CN103896527A (en) | Lightweight high-strength cement based composite material | |
| CN104478286B (en) | A kind of compound concrete anti-corrosive rust inhibitor | |
| CN108409252A (en) | A kind of regular tenacity high durability concrete and preparation method thereof | |
| CN101462843A (en) | Marine concrete corrosion resistant additive and preparation thereof | |
| CN105272004A (en) | Light-weight high-strength cement-based composite material | |
| CN102491706A (en) | High-performance concrete used in saline-alkaline corrosive environment | |
| CN104386965A (en) | Sulfate-resistant and corrosion-resistant impervious non-autoclaved C80P12 concrete pipe pile | |
| CN101186480A (en) | Vibration-free self-flowing dense concrete | |
| Poorsaheli et al. | A study on the durability parameters of concrete structures reinforced with synthetic fibers in high chloride concentrated shorelines | |
| CN103130467A (en) | Modified cement and application thereof | |
| CN111978036B (en) | C50-grade marine high-performance concrete | |
| CN100453488C (en) | Silicate cement | |
| Dimri et al. | A review on strength of concrete in seawater | |
| CN106565119B (en) | Ocean engineering corrosion resistance of chloride ion composite blending material for concrete | |
| CN104591664B (en) | Long-life concrete for steel-mixed combination beam hogging moment area and preparation method thereof | |
| CN104496245A (en) | Anti-erosion and anti-corrosion agent and preparation method thereof | |
| Poloju | Advanced Materials and Sustainability in Civil Engineering | |
| CN105601211A (en) | Special concrete for water conservancy project and preparation method for special concrete | |
| Nguyen et al. | Evaluation of modulus of elasticity for eco-friendly concrete made with seawater and marine sand | |
| Tijani et al. | Experimental study of influence of seawater on strength of concrete structures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
|
| RJ01 | Rejection of invention patent application after publication |