CN102001848A - Steamed high-performance concrete and preparation method thereof - Google Patents
Steamed high-performance concrete and preparation method thereof Download PDFInfo
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- CN102001848A CN102001848A CN2010105427575A CN201010542757A CN102001848A CN 102001848 A CN102001848 A CN 102001848A CN 2010105427575 A CN2010105427575 A CN 2010105427575A CN 201010542757 A CN201010542757 A CN 201010542757A CN 102001848 A CN102001848 A CN 102001848A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
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Abstract
The invention discloses steamed high-performance concrete and a preparation method thereof. The steamed high-performance concrete comprises P.042.5 ordinary Portland cement, a composite additive, 10-mesh rubber-based particles, mixing water, polycarboxylic acid type high-efficiency water reducing agent, II regional matching river sand with 2.4 to 2.8 fineness modulus, limestone stone with 5-25 mm particle size and the like. The preparation method of the steamed high-performance concrete comprises steamed systems, moisture and temperature insulation coating technology, maintenance technical measures after steam, and the like. The steamed high-performance concrete has excellent performance and obvious technological and economic effects, is applicable to industrial production and can effectively improve the performance of steamed concrete prefabricated parts and prolong the service life of engineering structures.
Description
Technical field
The present invention relates to a kind of concrete, be specifically related to the steam-cured high performance concrete of a kind of precast concrete, the invention still further relates to the preparation method of this steam-cured high performance concrete.
Background technology
Infrastructure projects such as China railways, highway, municipal administration exist a large amount of precast concretes.In the prefabricated components suitability for industrialized production, usually adopt the steam curing of concrete technology,, shorten the production cycle, enhance productivity to promote gain in strength.Though vapor cure has interests economically clearly, if mishandling, will can not receive desired result, even cause serious quality defect of concrete particular problem.It is generally acknowledged that vapor cure also can cause the damage of its internal microstructure when the fine sight structure of accelerate concrete forms, directly influence the long durability energy of prefabricated components.Practice shows that traditional steam-curing concrete prefabricated components expose many problems in the process under arms,, poor durability big, easy to crack as fragility etc.The survey showed that for the corrosion failure of the concrete prefabricated beam of San Mateo bridge on the san francisco, usa gulf: through steam-cured precast beam, must repair in that heavy corrosion destruction has been taken place after 17 years expose, and the precast beam of normal temperature maintenance does not have the destructive vestige; Railway autumn inspection result in recent years shows that also deterioration has in various degree appearred in China railways precast concrete sleeper, beam body.The anti-deicer salts of steam-curing concrete is degraded with corrosion performance will be weaker than common curing concrete, reduces the precuring time, increases steam-cured temperature, and the steam-curing concrete performance further descends
[1]Silicate cement will produce a series of physicochemical change in steam-cured process
[2], mainly show the aspect such as reduce with the alligatoring of density, crystal grain, true tumor fineness of thickening of cement particle surface screened film.These formation and physical and mechanical properties thereof that change the concrete microstructure all produce certain influence., Qian Hewen big etc. according to Wuzhong
[3,4]Studies show that in the vapor cure treating processes, physical change plays main effect for mortar and concrete physical-mechanical properties, is wherein accounting for very important position with volumetric expansion especially.
In order to improve the performance of steam-curing concrete, many investigators carry out many fruitful work
[5,6], research practice shows, forms by improving concrete, optimizes the steam curing system steam curing process, can significantly improve the performance of steam-curing concrete.In China railways precast concrete (beam body, sleeper etc.) is produced, formed with flyash and the two steam-curing concrete technology of mixing, adopt high-efficiency water-reducing agent of poly-carboxylic acid of slag, reduced the mass defect of common steam-curing concrete to a certain extent.Yet, the production practice of steam-curing concrete precast beam body from the extensive railway construction process of China, steam-curing concrete still exposes many problems, peels, falls layer as the steam-curing concrete top layer, (as depicted in figs. 1 and 2) such as shallow-layer tiny cracks occur.For this reason, the present invention is in conjunction with existing correlative study achievement with to Beijing-Shanghai High-Speed Railway major scientific and technological program research practice, researched and developed a kind of steam-cured high performance concrete and preparation method thereof, the quality of this steam-cured high performance concrete is significantly improved, the top layer does not have peeling, falls layer and cracking phenomena, and the endurance quality excellence has guaranteed the quality of steam-cured precast concrete.
Reference
[1]Quanbing?Yang，Qianrong?Yang，Peirong?Zhu.Scaling?and?corrosion?resistance?of?steam-cured?concrete，Cement?and?Concrete?Research，33(2003)1057-1061
[2]Barbara?Lothenbach，Frank?Winnefeld，Corinne?Alder，Erich?Wieland，Peter?Lunk.Effect?of?temperature?on?the?pore?solution，microstructure?and?hydration?products?of?Portland?cement?pastes，Cement?and?Concrete?Research，37(2007)483-491
[3] Wuzhong is big, Tian Ranjing, Jin Jianhua. leave standstill the research of phase in the cement concrete wet heat treatment, silicate journal, 1963,2 (4) 182-189
[4] Qian Hewen, Wang Yanmou. the physics chemical action of precuring phase in the wet heat treatment concrete process, silicate journal, 1964,3 (3) 217-222
[5]D.W.S.Ho，C.W.Chua，C.T.Tam.Steam-cured?concrete?incorporating?mineral?admixtures，Cement?and?Concrete?Research，33(2003)595-601；[6]A.A.Ramezanianpour，V.M.Malhotra.Effect?of?curing?on?the?compres-sive?strength，resistance?to?chloride-ion?penetration?and?porosity?of?concretes?incorporating?slag，fly?ash?or?silica?fume.Cement?and?Concrete?Composites，17(1995)125-133
Summary of the invention
First technical problem to be solved by this invention provides a kind of energy and reduces traditional steam-curing concrete apparent mass defective, improves traditional steam-curing concrete internal microstructure and long durability energy, effectively guarantee the steam-curing concrete component quality, prolong the steam-cured high performance concrete of engineering structure service life.
Second technical problem to be solved by this invention provides a kind of preparation method of this steam-cured high performance concrete.
In order to solve above-mentioned first technical problem, steam-cured high performance concrete provided by the invention, by ordinary Portland cement P.042.5, composite blend, the rubber-based particle of 10 order sizes, mixing water, the polycarboxylic acid high efficiency water reducing agent, the II district grating river sand of fineness modulus between 2.4～2.8, particle diameter is composition such as Wingdale rubble between 5～25mm, cement in every cube of concrete wherein: composite blend: mixing water: water reducer: river sand: rubble=0.65～0.70: 0.30～0.35: 0.27～0.28: 0.012: 1.40: 2.45 (mass ratio), mix rubber-based particle 8～12kg in every cube of concrete, composite blend is by 60 parts of I level flyash, 33 parts of S95 level slags, 7 parts of silicon ashes are formed.
In order to solve above-mentioned second technical problem, steam-cured high performance concrete preparation method provided by the invention, comprise steam curing system, moisture-heat preservation wrap technology and steam-cured after maintenance technology measure etc.Steam curing system by quietly stop, intensification, constant temperature and cooling quadravalence section form, and is that to be not more than 10 ℃/h, thermostat temperature be that 60 ℃ and cooling rate are not more than 15 ℃/h for 2～3 hours, heat-up rate between the wherein quiet stopping time; It is to adopt the good double-deck building cloth of moisture retention to cover to the concrete surface that exposes in the steam-cured process that moisture-heat preservation wraps technology; Maintenance technology measure after steam-cured is after the steam-cured demoulding that finishes steam-curing concrete (member) to be soaked in maintenance 7d in the room temperature water.
Application method of the present invention: the starting material of described steam-cured high performance concrete are good according to the proportioning weighing, successively pour into sand, stone, cement, mineral powder material in the forced mixer, dry mixing is 10～15 seconds then, add entry and high efficiency water reducing agent again, continued stir about 120～150 seconds, mixture goes out machine, measures the slump, the suitable then closely knit shaping test piece on shaking table of the slump.The maintenance in advance 2～3 hours (quiet stopping the stage) under the standard environment condition earlier of the test specimen of forming, on the concrete sample exposure, cover double-deck geotextile then, and it is indoor that test specimen is moved to vapor cure, carry out vapor cure (intensification, constant temperature, cooling), vapor cure places room temperature water with the steam-curing concrete after the steam-cured demoulding (member) after finishing, after its 7 days above-mentioned link of maintenance that submerge is finished, concrete (member) is pressed finished product stack, and cover with tarpaulin.
The present invention is based on the heightened awareness to concrete hydrating process under temperature in the steam-cured process and the hydration heat coupling, and to the from outward appearance to inner essence grasp of thermograde and hydration rate gradient of concrete in the steam-cured process, form and make concrete before steam-cured, have less free water and form microstructure preferably by optimizing concrete, and by reduce concrete from outward appearance to inner essence thermograde and adopt normal-temperature water to support in steam-cured back the steam-curing concrete microstructure carried out modifier treatment, thereby obtain optimum steam-curing concrete microstructure and performance, and formed the present invention.Thereby scientific basis of the present invention is abundant.
In the process of this steam-cured high performance concrete of research and development and preparation method thereof, carried out great deal of experimental work, and, found out the key factor that influences steam-curing concrete performance and microstructure in conjunction with correlative study achievement and physical chemistry knowledge scheduling theory are analyzed.In conjunction with typical test proportioning as shown in table 1, comparative studies different starting material form swelling distortion (Fig. 3) and water absorbing properties (Fig. 4～Fig. 7) of steam-curing concretes; (Fig. 8～Fig. 9) and the influence of porosity (Figure 10 and Figure 11) have been analyzed steam-cured back water and have been supported and handle and water is supported the time to the influence of steam-curing concrete porosity (Figure 12～Figure 13) to the steam-curing concrete apparent mass to have investigated the different process measure.The best starting material that obtain the steam-cured high performance concrete of the present invention are on this basis formed and preparation method thereof.Therefore, the present invention has competent experimental study basis and foundation, and validity and feasibility are good, has guaranteed the quality of steam-curing concrete better.
Advantage of the present invention and positively effect:
1, the starting material component selected for use of steam-cured high performance concrete of the present invention is easy to get, steam-cured back concrete performance excellence, guaranteed concrete (member) quality, reduce the shortcoming of traditional steam-curing concrete apparent mass defective and poor durability, effectively prolonged the service life of steam-curing concrete prefabricated components.
2, steam-cured high performance concrete preparation method technology provided by the invention is simple, easy to operate, and the reliability height has the good technical superiority in economy.
3, the present invention is applicable to the prefabricated steam-curing concrete beam body of high-speed railway, highway, the suitability for industrialized production of sleeper member, can effectively improve steam-curing concrete component quality and production efficiency.
In sum, the present invention is to provide good steam-cured high performance concrete of a kind of Technological Economy combined effect and preparation method thereof, guarantee the quality of a large amount of infrastructure project structures such as China Express Railway, highway, have the huge social economic benefits.
Description of drawings
Fig. 1 is that the peeling photo appears in traditional steam-curing concrete top layer;
Fig. 2 stays top layer crackle photo after traditional steam-cured beam body exposed surface is removed the loose surface;
Fig. 3 is the swelling deformation result of each steam-curing concrete;
Fig. 4 is an A series steam-curing concrete water-absorbent test result;
Fig. 5 is a B series steam-curing concrete water-absorbent test result;
Fig. 6 is the steam-cured high performance concrete water-absorbent test result of C series of the present invention;
Fig. 7 is the steam-cured high performance concrete water-absorbent test result of D series of the present invention;
Fig. 8 is steam-curing concrete (C, D series) the exposure apparent mass test photo that does not adopt covering process;
Fig. 9 is that the intact C in steam-curing concrete top layer, D series steam-curing concrete apparent mass is tested photo after adopting the geotextile covering process;
Figure 10 be under the different covering process C series steam-curing concrete top layer overall porosity, capillary-size pore rate and macro porosity led influence the result; Among the figure: B represents normal curing, Z represent 60 ℃ steam-cured, cover processing, ZB represents that 60 ℃ of steam-cured, geotextile cover and handle, ZS represents that 60 ℃ of steam-cured, plastics films cover and handle;
Figure 11 be under the different covering process D series steam-curing concrete top layer overall porosity, capillary-size pore rate and macro porosity led influence the result; Among the figure: B represents normal curing, Z represent 60 ℃ steam-cured, cover processing, ZB represents that 60 ℃ of steam-cured, geotextile cover and handle, ZS represents that 60 ℃ of steam-cured, plastics films cover and handle;
Figure 12 is the porosity test result of 28d C in the length of time series steam-curing concrete of the different curing conditions in steam-cured back; Among the figure: place air (ZK) after a. is steam-cured always; B. steam-curedly be placed on 3 days (Z3) in the water; C. steam-curedly be placed on 7 days (Z7) in the water; D. steam-curedly be placed on 28 days (ZS) in the water; E. normal curing condition B;
Figure 13 is the porosity test result of 28d D in the length of time series steam-curing concrete of the different curing conditions in steam-cured back; Among the figure: place air (ZK) after a. is steam-cured always; B. steam-curedly be placed on 3 days (Z3) in the water; C. steam-curedly be placed on 7 days (Z7) in the water; D. steam-curedly be placed on 28 days (ZS) in the water; E. normal curing condition B.
Embodiment
Following examples are intended to illustrate the present invention rather than to further qualification of the present invention.
A kind of steam-cured high performance concrete, by ordinary Portland cement P.042.5, composite blend, the rubber-based particle of 10 order sizes, mixing water, the polycarboxylic acid high efficiency water reducing agent, the II district grating river sand of fineness modulus between 2.4～2.8, particle diameter Wingdale rubble between 5～25mm is formed, in every cube of concrete by quality ratio, cement: composite blend: mixing water: water reducer: river sand: rubble=0.65～0.70: 0.30～0.35: 0.27～0.28: 0.012: 1.40: 2.45, mix rubber-based particle 10kg in every cube of concrete, described composite blend is by 60 parts of I level flyash, 95 grades of slags of 33 parts of S, 7 parts of silicon ashes are formed.
The preparation method of steam-cured high performance concrete, comprise steam curing system, moisture-heat preservation wrap technology and steam-cured after the maintenance technology measure, described steam curing system by quietly stop, intensification, constant temperature and cooling quadravalence section form, it is 2～3 hours between the described quiet stopping time, described heat-up rate is not more than 10 ℃/h, described thermostat temperature is 60 ℃, and described cooling rate is not more than 15 ℃/h; It is to adopt the good double-deck geotextile of moisture retention to cover to the concrete surface that exposes in the steam-cured process that described moisture-heat preservation wraps technology; Described maintenance technology measure after steam-cured is after the steam-cured demoulding that finishes the steam-curing concrete member to be soaked in maintenance 7d in the room temperature water.
Show the different proportioning examples of forming steam-curing concrete below, see Table 1:
The different proportioning examples of forming steam-curing concrete of table 1
According to described starting material and other preparation work purchased, join 25 liters of starting material that concrete is required be as the criterion weighing examination of steam-cured high performance concrete proportioning of the present invention.
Then, successively pour into load weighted sand, stone, cement, mineral powder material, rubber-based particle etc. in the forced mixer, starting stirrer stirs compound 10～15 seconds, add entry and high efficiency water reducing agent again, continued stir about 120～150 seconds, the mixture that stirs is gone out machine, measure the mixture slump, the slump that reaches regulation is the test specimen of closely knit moulding specified dimension on shaking table then.The maintenance in advance 2～3 hours (quiet stopping the stage) under the standard environment condition earlier of the test specimen of forming, on the concrete sample exposure, cover double-deck geotextile then, and it is indoor that test specimen is moved to vapor cure, carry out vapor cure, steam curing system according to the rules heats up, constant temperature, cooling, after vapor cure finishes, observe the surface appearance of steam-curing concrete test specimen; And then the steam-curing concrete after the steam-cured demoulding (member) placed room temperature water, with its maintenance 7 days that submerges, after the taking-up concrete sample continued to place under the indoor standard environment maintenance to test corresponding concrete swelling distortion, water-absorbent, apparent mass, porosity to 28d.
Performance test is: the minimum (see figure 3) of volumetric expansion, the water-absorbent that adopts the present invention's's (C, D series proportioning) concrete to produce in steam-cured process is starkly lower than other series concretes (seeing Fig. 6, Fig. 7), the apparent mass after steam-cured has obtained improving preferably, and adopting geotextile to cover the back surface quality further improves, do not see Table a layer cracking peeling (Fig. 8, Fig. 9), porosity minimum (Figure 10 and shown in Figure 11), adopt and concrete is continued the method for immersion maintenance in 7 days after steam-cured, can effectively reduce the porosity (seeing Figure 12 and Figure 13) of steam-curing concrete.
Claims (3)
1. steam-cured high performance concrete, it is characterized in that: by ordinary Portland cement P.042.5, composite blend, the rubber-based particle of 10 order sizes, mixing water, the polycarboxylic acid high efficiency water reducing agent, the II district grating river sand of fineness modulus between 2.4～2.8, particle diameter Wingdale rubble between 5～25mm is formed, in every cube of concrete by quality ratio, cement: composite blend: mixing water: water reducer: river sand: rubble=0.65～0.70: 0.30～0.35: 0.27～0.28: 0.012: 1.40: 2.45, mix rubber-based particle 8～12kg in every cube of concrete.
2. steam-cured high performance concrete according to claim 1 is characterized in that: described composite blend is made up of 60 parts of I level flyash, 33 parts of S95 level slags, 7 parts of silicon ashes.
3. the method for preparing the described steam-cured high performance concrete of claim 1, comprise steam curing system, moisture-heat preservation wrap technology and steam-cured after the maintenance technology measure, it is characterized in that: described steam curing system by quietly stop, intensification, constant temperature and cooling quadravalence section form, it is 2～3 hours between the described quiet stopping time, described heat-up rate is not more than 10 ℃/h, described thermostat temperature is 60 ℃, and described cooling rate is not more than 15 ℃/h; It is to adopt the good double-deck geotextile of moisture retention to cover to the concrete surface that exposes in the steam-cured process that described moisture-heat preservation wraps technology; Described maintenance technology measure after steam-cured is after the steam-cured demoulding that finishes the steam-curing concrete member to be soaked in maintenance 7d in the room temperature water.
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| CN103030355A (en) * | 2012-12-27 | 2013-04-10 | 长安大学 | Light high-crack-resistance cement concrete |
| CN103553496A (en) * | 2013-10-29 | 2014-02-05 | 中南大学 | High-damping self-compaction concrete |
| CN104960085A (en) * | 2015-05-19 | 2015-10-07 | 陕西东泽高科实业有限公司 | Pipe-manufacturing method for vibration-molding pipe of core mould |
| CN111606630A (en) * | 2020-06-15 | 2020-09-01 | 陕西金磊混凝土有限公司 | Steam-curing-free high-fluidity concrete and preparation method thereof |
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| CN103030355B (en) * | 2012-12-27 | 2014-07-16 | 长安大学 | Light high-crack-resistance cement concrete |
| CN103553496A (en) * | 2013-10-29 | 2014-02-05 | 中南大学 | High-damping self-compaction concrete |
| CN104960085A (en) * | 2015-05-19 | 2015-10-07 | 陕西东泽高科实业有限公司 | Pipe-manufacturing method for vibration-molding pipe of core mould |
| CN111606630A (en) * | 2020-06-15 | 2020-09-01 | 陕西金磊混凝土有限公司 | Steam-curing-free high-fluidity concrete and preparation method thereof |
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