CN101497508A - Composite modifying agent and low-strength concrete prepared thereby - Google Patents
Composite modifying agent and low-strength concrete prepared thereby Download PDFInfo
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- CN101497508A CN101497508A CNA2009100585531A CN200910058553A CN101497508A CN 101497508 A CN101497508 A CN 101497508A CN A2009100585531 A CNA2009100585531 A CN A2009100585531A CN 200910058553 A CN200910058553 A CN 200910058553A CN 101497508 A CN101497508 A CN 101497508A
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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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
Abstract
The invention discloses a composite modifier and environment water corrosion resistant low-intensity level concrete prepared from the same for slope protection and reinforcement engineering and roadbed processing engineering. The composite modifier comprises 100 portions of fly ash, 0.05 to 0.2 portion of SJ-2 type nonionic air-entraining component, 1 to 10 portions of naphthalene sulfonate water reducing component, 1 to 10 portions of sodium sulfate or sodium borate setting time adjusting component, and the like. The concrete consists of silicate cement, a modifier, stones and water. The composite modifier can optimize hydrate product compositions of cement stones in the concrete, and introduce tiny closed air holes to the concrete so as to improve the pore structure thereof and improve the workability, and the like of the concrete, thereby remarkably improving the durability of the slope protection and reinforcement engineering and the roadbed processing engineering. The composite modifier has the advantage that the concrete prepared from the compound modifier has excellent environment water corrosion resistance and can remarkably reduce the cost of a construction project under the condition of satisfying the requirement on low design strength level.
Description
Technical field
The invention belongs to building material technical field, particularly a kind of composite modifier and contain the concrete retaining structure of this composite modifier or the weak concrete that foundation treatment engineering is used.
Background technology
In railway, road construction process, there are a large amount of subgrade engineerings and foundation treatment engineering, as not being subjected to the erosion of extraneous factor for protection side slope surface or preventing sloping body sliding normal concrete (or the sheet stone concrete) retaining structure that adopts of disaster accident that causes that collapses; For improving cement, flyash and crushed stone (CFG) pile foundation that bearing capacity of foundation soil adopts etc.These engineerings adopt the lower intensity level concrete material to meet the demands.As gravity retaining wall is a kind of dependence body of wall deadweight opposing earth pressure, prevents the soil body sliding retaining structure that collapses, and its sectional dimension size is subjected to mainly that the wall body wholely slides, topples, substrate off-centre, and base stress and wall body cross-sectional strength are controlled.For concrete (sheet stone concrete) gravity retaining wall, the requirement of strength of its wall body section material is lower.Single-track railway gravity retaining wall with the high 12m of wall is an example, and when the comprehensive internal friction angle of wall back of the body filler was 30 °, the normal direction stress of full wall wall body cross section maximum was 0.4MPa; Shear-stress is 0.15MPa, adopts low strength (C15) concrete (sheet stone concrete) to meet the demands.
Yet, slope reinforcement generally contacts with soil, rock stratum and underground water with concrete retaining structure, the foundation treatment engineering of protection, because the composition and the cellular structure characteristics of cement concrete, when containing corrosive mediums such as vitriol, carbonate, water in these ground, weak concrete is subjected to the erosion of these surrounding mediums easily and causes the deterioration of composition, microstructure change and use properties, has a strong impact on the service life and the traffic safety of subgrade engineering works or foundation treatment engineering.In order to prolong and guarantee the service life of concrete retaining structure or roadbed treatment project; " railway concrete structure durability design temporary provisions " are mainly controlled by improving measures such as strength grade of concrete, the maximum water-cement ratio of restriction and minimum gel material content; these measures can be played certain effect, but construction costs is big.
In order to improve concrete performance, the countries in the world scholar has made many effort, and more existing patents relate to concrete durability.For example, Chinese patent CN101265050 discloses a kind of method that keeps concrete 's air-containing to improve concrete durability, this method is 0.01～0.06% steady gas agent WQ-X or the WQ-Y that adds cement weight in concrete mixes and stirs, still adopt the conventional technology of mixing and stirring after mixing steady gas agent, the concrete soil slump, air content through the time loss little, keep the concrete 's air-containing effect obvious, can improve concrete endurance quality such as freeze proof.Patent CN100999396 discloses a kind of composition that is used to improve endurance performance of concrete, said composition comprises 10～50 parts of monomers, 0～26 part of neutralizing agent, 0.01～0.50 part of reductive agent, 0.01～0.20 part of linking agent, 1～10 part of properties-correcting agent, 0.05～0.30 part in oxygenant, 20～90 parts of raw materials in weight portion of water, this invention is mainly to concrete microfracture, microporosity and body spray or flood, with far-infrared radiation original position synthesizing high-hydroscopicity resin, utilize the water-swelling of original position synthetic absorbent resin, closely knit crack or hole block the transmission route of WATER AS FLOW MEDIUM.CN101239802 discloses a kind of durability concrete, and the quality of gelling material is 260～600kg in this concrete, and the quality of sand is 500～880kg, and the quality of rubble is 900～1380kg, and the quality of water is 130～180kg; Said gelling material contains cement, flyash and slag powders, wherein cement accounts for 40%～85% of binder total amount, flyash accounts for 5%～30% of binder total amount, slag powders accounts for 10%～30% of binder total amount, its characteristics are to improve concrete cracking resistance, freeze proof and function such as opposing chloride permeability etc., can satisfy the requirement in work-ing life more than 100 years with the structure and the member of this durability concrete production.All do not relate to anti-ambient water erosive weak concrete in the above-mentioned patent, the intension of the concrete durability that these patents are related and specific aim thereof exist different significantly with the anti-ambient water erosion performance of applicable elements and concrete.In order to improve cement concrete sulfate resistance type ambient water erosion performance, the general both at home and abroad sulphate-resistant cement concrete batching that adopts, the mineral composition of sulphate-resistant cement is different from ordinary Portland cement, C3A and C3S content are lower in the sulphate-resistant cement grog, need just can make with specific proportioning raw materials, thereby the price comparison costliness of this cement, and on market, be not easy to obtain.
Obviously, adopt an effective measure and improve the performance of weak concrete, these adopt the retaining structure of lower intensity level concrete and the anti-ambient water erosion performance of roadbed treatment project with practical raising, under the prerequisite of the weather resistance of guaranteeing railway and highway subgrade construction and operation security, realize good economic benefit, significant.
Summary of the invention
The objective of the invention is to overcome above shortcomings in the prior art, a kind of composite modifier is provided and, is used to satisfy the needs of concrete retaining structure, foundation treatment engineering (CFG stake) by the high durable concrete of anti-ambient water erosive low strength of its preparation.
The technical scheme that realizes the object of the invention is as follows:
A kind of anti-ambient water corrodes the weak concrete composite modifier, it is characterized in that: described composite modifier is made up of the component of following mass fraction: 100 parts of low calcium fly ash, 0.05～0.2 part of air entrapment agent, 1～10 part of water reducer, 1～10 part time of coagulation conditioning agent.
Described low calcium fly ash be thermal power plant discharge do low calcium fly ash, can be the low calcium fly ash of I level or II level (GB/T1596-2005), or the mixture of I level, the low calcium fly ash of II level, with the low calcium fly ash the best of I level.
Described air entrapment agent S-J2 non-ionic type air entrapment agent.
Described water reducer is the naphthalenesulfonate based water reducer.
Described time of coagulation, conditioning agent was Sodium Tetraborate or sodium sulfate.
A kind of weak concrete of forming by composite modifier of the present invention, it is characterized in that: described weak concrete is made up of the component of following weight part: 100～180 parts of ordinary Portland cements, 120～200 parts of composite modifiers, 120～150 parts in water, 680～790 parts in sand, 1050～1200 parts of rubbles.
Weak concrete of the present invention is that strength grade is C25 and following concrete.
(ambient water of the present invention comprises and contains SO4 ambient water
2-, HCO3
-, H
+, Mg
2+Etc. aggressiveness ion and an alkali metal salt thereof etc.) and ground in contained concrete is had rodent material mainly is SO42
-, HCO3
-, H
+, Mg2
+Etc. aggressiveness ion and an alkali metal salt thereof, its erosion mechanism has chemical action and physical action two aspects.
The chemical erosion mechanism of action mainly is to contain aggressiveness ionic ambient water invasion water cement-based material inside, with the ion in its hole solution or the cement-hydrate generation chemical reaction of hole wall, form soluble substance or swelling property material or do not have the gelling material, and the cement-based material The Nomenclature Composition and Structure of Complexes is changed, cause material internal to produce volumetric expansion or surface erosion, cause the works surface cracking, peel off, corrosion and performance degradation.The chemical erosion performance of the anti-ambient water of concrete depends on cement-hydrate more---calcium hydroxide (portlandite) and aluminate hydrate and concrete penetrating quality, reduce the content of these hydrates, improve the pore fluid of concrete structure, reduce aggressiveness ionic perviousness, can significantly improve concrete anti-ambient water erosion performance, thereby improve the weather resistance of concrete structure.
The physical erosion mechanism of action mainly is that the swelling pressure that produce of saline crystallization are to concrete destruction.For the concrete retaining structure, because its back side contacts with underground water with ground, and its front surface is exposed in the atmospheric environment, underground water infiltrates the concrete from its back side, evaporate atmospheric environment from its front surface again, the salt medium will produce the physical erosion destruction in the concrete surface layer crystallization.
Therefore, concrete is subjected to the erosion damage effect of ambient water, and its internal cause is that inside concrete contains the hydrate and the ambient water that are subject to the aggressiveness ion erosion and can infiltrate its inner capillary porosity duct.Improve the inside concrete hydrated product and form, reduce aggressiveness ionic medium in the ambient water and migrate to speed in the concrete, could improve the anti-ambient water erosion performance of concrete effectively.
Composite modifier of the present invention by low calcium fly ash, air entrapment agent, water reducer, time of coagulation component such as conditioning agent form, wherein:
Low calcium fly ash both can dilute the content that in the silicate series cement ambient water is corroded more sensitive C3A mineral, again the Ca (OH) that can form with hydrated cementitious
2Pozzolanic reaction takes place, and is increased in ambient water and corrodes the content of hydrated calcium silicate C-S-H more stable, that calcium silicon is lower down, thereby help improving concrete anti-ambient water erosion performance;
Described air entrapment agent is a SJ-2 type non-ionic type air entrapment agent, is that main raw material is prepared from natural wild plant soap English, and its main component is the triterpenoid saponin powder; SJ-2 type non-ionic type air entrapment agent can make inside concrete introduce the small bubbles of the small sealing of an amount of stable existence, the introducing of this bubble has multiple function: first, improve the pore fluid of concrete structure, reduce concrete perviousness, delay the rate of migration of corrosive medium in concrete in the outside atmosphere; The second, discharge or alleviate because the destructive force that all kinds of expansion sources cause concrete, as the generation of saline crystallization, swelling property product or unfreezing etc.; The 3rd, the strength degradation that compensation causes owing to pore makes the concrete water-cement ratio of actual preparation reduce, thereby has reduced owing to there is the capillary bore that forms in too much free water; The 4th, improve workabilities such as concrete water-retentivity, flowability; The 5th, increase slurry quantity, save cost;
Described diminishing component is the solid powdery material, and belonging to a class naphthalenesulfonate is tensio-active agent, has stronger water-reduction, can significantly improve the Concrete Construction performance;
Described time of coagulation, conditioning agent was sodium sulfate or Sodium Tetraborate, and sodium sulfate has the early strength acceleration effect, and Sodium Tetraborate etc. have delayed coagulation, can regulate the concrete setting and harden time at different requirements, was convenient to construction.
The concrete that comprises composite modifier of the present invention is the lower intensity level concrete of C25 and following each strength grade, adopting non-limestone powder is that the normal silicate series cement and the composite modifier of blended material is gelling material, the quality volume of composite modifier is 〉=40%, water-cement ratio≤0.45, the coarse-fine aggregate consumption is between (1800～1900) kg/m3; The concrete mix air content is 5%～8%.
Compared with prior art, the invention has the beneficial effects as follows: composite modifier of the present invention can effectively improve concrete anti-ambient water erosion performance, the weak concrete that adopts composite modifier of the present invention to prepare can significantly improve the erosion action of the resistance to fouling ambient water of subgrade protection and reinforcing engineering and foundation treatment engineering structure (as concrete retaining structure, CFG stake etc.), guarantee the weather resistance of engineering structure, and have remarkable economical.
Description of drawings
Fig. 1 is the variation test-results of different test specimen quality with soak time.
Fig. 2 for the coefficient against corrosion (representing) of different test specimens with ultimate compression strength with the result of variations of soaking the length of time.
Embodiment
How further specify the present invention below in conjunction with specific embodiment, Comparative Examples and test thereof realizes.(because that the weak concrete strength grade of the railway bed engineering that relates to comprises is more, as C25, C20, C15 and with inferior, and each composition material and proportioning all influence concrete performance below is an example with C15 only, lists exemplary embodiments.)
Embodiment 1
The weak concrete of present embodiment is composed of the following components: ordinary Portland cement 15.8kg, composite modifier 15.8kg, water 14.2kg, sand 75.0kg, rubble 105.0kg;
Described composite modifier is composed of the following components: 14.35kg II level is hanged down calcium fly ash, 0.01kgSJ-2 type air entrapment agent, 0.72kg part naphthalenesulfonate pressed powder water reducer, 0.72kg part sodium sulfate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of II level, 0.1 part of SJ-2 type air entrapment agent, 5 parts of naphthalenesulfonate pressed powder water reducers, 5 parts in sodium sulfate.
Embodiment 2
The weak concrete of present embodiment is composed of the following components:
Ordinary Portland cement 13.0kg, composite modifier 19.5kg, water 13.6kg, sand 73.0kg, rubble 107.0kg;
Consisting of of described composite modifier: the 17.71kgII level is hanged down calcium fly ash, 0.02kgSJ-2 type air entrapment agent, 0.885kg part naphthalenesulfonate pressed powder water reducer, 0.885kg part sodium sulfate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of level, 0.1 part of SJ-2 type air entrapment agent, 5 parts of naphthalenesulfonate pressed powder water reducers, 5 parts in sodium sulfate.
Embodiment 3
The weak concrete of present embodiment is composed of the following components:
Ordinary Portland cement 15.3kg, composite modifier 15.3kg, water 13.7kg, sand 73.5kg, rubble 109.0kg;
Consisting of of described composite modifier: the 14.15kgII level is hanged down calcium fly ash, 0.02kgSJ-2 type air entrapment agent, 0.71kg part naphthalenesulfonate pressed powder water reducer, 0.42kg part Sodium Tetraborate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of level, 0.12 part of SJ-2 type air entrapment agent, 5 parts of naphthalenesulfonate pressed powder water reducers, 3 parts of Sodium Tetraboratees.
Embodiment 4
The weak concrete of present embodiment is composed of the following components:
Ordinary Portland cement 12.5kg, composite modifier 18.7kg, water 13.1kg, sand 72.0kg, rubble 110.5kg;
Consisting of of described composite modifier: 17.30kg II level is hanged down calcium fly ash, 0.02kgSJ-2 type air entrapment agent, 0.86kg part naphthalenesulfonate pressed powder water reducer, 0.52kg part Sodium Tetraborate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of level, 0.12 part of SJ-2 type air entrapment agent, 5 parts of naphthalenesulfonate pressed powder water reducers, 3 parts of Sodium Tetraboratees.
Embodiment 5
The weak concrete of present embodiment is composed of the following components:
Ordinary Portland cement 10.0kg, composite modifier 20.0kg, water 12.0kg, sand 71.0kg, rubble 115.0kg;
Consisting of of described composite modifier: the mixture of the low calcium fly ash of 18.01kgI level and II level, 0.01kgSJ-2 type air entrapment agent, 1.80kg part naphthalenesulfonate pressed powder water reducer, 0.18kg part Sodium Tetraborate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of level, 0.05 part of SJ-2 type air entrapment agent, 10 parts of naphthalenesulfonate pressed powder water reducers, 1 part of Sodium Tetraborate.
Embodiment 6
The weak concrete of present embodiment is composed of the following components:
Ordinary Portland cement 16.5kg, composite modifier 13.5kg, water 13.5kg, sand 72.0kg, rubble 108.0kg;
Consisting of of described composite modifier: the 12.03kgI level is hanged down calcium fly ash, 0.02kgSJ-2 type air entrapment agent, 0.25kg part naphthalenesulfonate pressed powder water reducer, 1.20kg part Sodium Tetraborate.The proportioning of this composite modifier is: 100 parts of the low calcium fly ash of level, 0.2 part of SJ-2 type air entrapment agent, 2 parts of naphthalenesulfonate pressed powder water reducers, 10 parts of Sodium Tetraboratees.
Comparative Examples 1
The weak concrete of this Comparative Examples is composed of the following components:
Ordinary Portland cement 24.0kg, water 21.0kg, sand 78.0kg, rubble 107.0kg.
Comparative Examples 2
The weak concrete of this Comparative Examples is composed of the following components:
Ordinary Portland cement 35.0kg, water 17.5kg, sand 74.8kg, rubble 111.0kg.
The concrete design strength of the foregoing description and Comparative Examples is C15, cement all adopts Xiangxiang, Hunan to produce splendid peak board ordinary Portland cement (P.042.5), cement actual measurement 28d ultimate compression strength 45.2MPa, and sand adopts river sand, rubble adopts the Wingdale rubble, and water is tap water.Wherein Comparative Examples 1 is by the preparation of actual design intensity, and Comparative Examples 2 (is got H by the maximum water-cement ratio of plain concrete under the chemical corrosion environment in " the railway concrete structure durability designs provisional track "
2Environment, (w/c)
Max=0.5) and the regulation design of minimum gel material content.The proportioning of embodiment and Comparative Examples sees Table 1.
The concrete proportioning of table 1 embodiment, Comparative Examples/(units/m
3)
| Cement | Composite modifier (replacement percentage ratio) | Water | Sand | Rubble | |
| Comparative Examples 1 | 240 | 0 | 210 | 780 | 1070 |
| Comparative Examples 2 | 350 | 0 | 175 | 748 | 1110 |
| Embodiment 1 | 158 | 158(50％) | 142 | 750 | 1050 |
| Embodiment 2 | 130 | 195(60％) | 136 | 730 | 1070 |
| Embodiment 3 | 153 | 153(50％) | 137 | 735 | 1090 |
| Embodiment 4 | 125 | 187(60％) | 131 | 720 | 1105 |
| Embodiment 5 | 100 | 200(70％) | 120 | 710 | 1150 |
| Embodiment 6 | 165 | 135(45％) | 135 | 720 | 1080 |
Below high-speed carbonation test by the foregoing description and Comparative Examples test specimen further specify beneficial effect of the present invention.
According to said ratio, respectively sand, stone and ordinary Portland cement, composite modifier are added successively in the forced mixer and stirred 30 seconds, add entry then, restir 90～120 seconds, the fresh concrete that obtains stirring.
Employing is of a size of 150 * 150 * 150mm
3Moulding is carried out in the cubes die trial, and test specimen after the moulding is placed mark and supported maintenance demoulding after about 36 hours in the chamber, continues to place the standard curing room maintenance to 7d, test specimen is immersed in the 5%Na of (22 ± 3) ℃ respectively
2SO
4In solution and the clear water, and the mass change of routine test test specimen and coefficient against corrosion (vitriol soaks test specimen and soaks the ratio of the ultimate compression strength of test specimen with clear water), its result such as Fig. 1～shown in Figure 2.High-speed carbonation test is tested according to being defined in the flash carbonization case in " Standard for test methods of longterm performance and durability of ordinary concrete standard " (85), begin to carry out carbonization test behind the test specimen normal curing 28d, gas concentration lwevel is (20 ± 2) %, relative humidity (65 ± 5) %, temperature is (20 ± 2) ℃, test the carbonation depth of 3d, 7d, 14d, 28d test specimen respectively, test result is as shown in table 2.
As seen from Figure 1, at 5%Na
2SO
4Under the soaking conditions in the solution, different embodiment, Comparative Examples test specimen quality present different variation tendencies with the prolongation of soak time, do not mix the Comparative Examples 1 of composite modifier and the quality of Comparative Examples 2 test specimens and begin to occur quick increase, after soak time surpasses 28d, the test specimen quality begins to descend, reach 120d to immersion after, negative growth appears in the test specimen quality, be that reducing appears in the test specimen quality, the test specimen surface corrosion occurs and degrades phenomenon; And admixture the quality of embodiment test specimen of composite modifier very fast increase appears in early stage soaking, yet along with the prolongation test specimen quality of soaking test specimen remains unchanged substantially, the phenomenon that reducing does not appear in the test specimen quality, this shows that test specimen tangible sulphate attack does not take place destroys the erosion performance of the anti-sulfur acid salt environment water that shows.
From the result of Fig. 2 as can be known, along with the prolongation of soaking the length of time, variation in various degree appears in the coefficient against corrosion of different test specimens.Yet for Comparative Examples 1 of not mixing composite modifier and Comparative Examples 2 test specimens, its coefficient against corrosion is promptly reduced to below 1.0 after reaching 90d the length of time soaking, and continues later on to descend; And for the coefficient against corrosion of the embodiment test specimen of mixing composite modifier survey and soak in the length of time all more than 1.0.Show also that from coefficient test result against corrosion composite modifier can significantly improve the erosion performance of the anti-sulfur acid salt environment water of concrete sample.
Table 2 has further provided the anti-carbonation properties of different concrete samples, and experimental test is the result show, compare with Comparative Examples 2 with Comparative Examples 1, admixture the concrete of composite modifier have anti-carbonation properties preferably.
Different concrete anti-carbonation properties under the table 2 flash carbonization condition
Above-mentioned test-results shows, composite modifier can effectively improve concrete anti-ambient water erosion performance, the weak concrete that adopts composite modifier to prepare can significantly improve the erosion action of the resistance to fouling ambient water of subgrade protection and reinforcing engineering and foundation treatment engineering structure (as concrete retaining structure, CFG stake etc.), guarantees the weather resistance of engineering structure.
Claims (7)
1, a kind of composite modifier is characterized in that this composite modifier is made up of the component of following weight part: 100 parts of low calcium fly ash, 0.05～0.2 part of air entrapment agent, 1～10 part of water reducer, 1～10 part time of coagulation conditioning agent.
2, composite modifier according to claim 1 is characterized in that: described low calcium fly ash is the low calcium fly ash of I level or II level, or the mixture of I level, the low calcium fly ash of II level.
3, composite modifier according to claim 2 is characterized in that: described low calcium fly ash is the low calcium fly ash of I level.
4, composite modifier according to claim 1 is characterized in that: described air entrapment agent is a SJ-2 type non-ionic type air entrapment agent.
5, composite modifier according to claim 1 is characterized in that: described water reducer is that naphthalenesulfonate is the diminishing component.
6, composite modifier according to claim 1 is characterized in that: described time of coagulation, conditioning agent was Sodium Tetraborate or sodium sulfate.
7, a kind of by any weak concrete that described composite modifier is formed of claim 1～5, it is characterized in that: described weak concrete is made up of the component of following mass fraction: 100～180 parts of ordinary Portland cements, 120～200 parts of composite modifiers, 120～150 parts in water, 680～790 parts in sand, 1050～1200 parts of rubbles.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531501A (en) * | 2012-01-09 | 2012-07-04 | 山西省交通科学研究院 | High-doping-amount fly ash concrete road surface material and preparation method thereof |
| CN103159416A (en) * | 2013-03-27 | 2013-06-19 | 交通运输部科学研究院 | Concrete cementing material, mortar and concrete for buildings, and preparation methods |
| CN110372254A (en) * | 2019-07-30 | 2019-10-25 | 广州建盛建材有限公司 | A kind of composite modifier and weak concrete as made from it |
| CN110451840A (en) * | 2019-08-23 | 2019-11-15 | 中铁二院工程集团有限责任公司 | A kind of combined type compacting agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041712C (en) * | 1994-12-14 | 1999-01-20 | 华南理工大学 | Method for preparing high impervious and anticorrosive concrete with ternary agent |
| CN1169404A (en) * | 1996-06-24 | 1998-01-07 | 张显军 | Plasticizing lead gas for building mortar and concrete, lead gas water-reducer and preparation technology thereof |
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2009
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531501A (en) * | 2012-01-09 | 2012-07-04 | 山西省交通科学研究院 | High-doping-amount fly ash concrete road surface material and preparation method thereof |
| CN103159416A (en) * | 2013-03-27 | 2013-06-19 | 交通运输部科学研究院 | Concrete cementing material, mortar and concrete for buildings, and preparation methods |
| CN103159416B (en) * | 2013-03-27 | 2015-05-06 | 交通运输部科学研究院 | Concrete cementing material, mortar and concrete for buildings, and preparation methods |
| CN104743946A (en) * | 2013-03-27 | 2015-07-01 | 交通运输部科学研究院 | Concrete added with concrete binding material for construction |
| CN104773978A (en) * | 2013-03-27 | 2015-07-15 | 交通运输部科学研究院 | Preparation of constructional concrete gelling material |
| CN110372254A (en) * | 2019-07-30 | 2019-10-25 | 广州建盛建材有限公司 | A kind of composite modifier and weak concrete as made from it |
| CN110451840A (en) * | 2019-08-23 | 2019-11-15 | 中铁二院工程集团有限责任公司 | A kind of combined type compacting agent |
| CN110451840B (en) * | 2019-08-23 | 2021-11-30 | 中铁二院工程集团有限责任公司 | Composite type compacting agent |
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