CN104261764B - A kind of shrinkage type concrete interface treating agent and interface processing method thereof - Google Patents
A kind of shrinkage type concrete interface treating agent and interface processing method thereof Download PDFInfo
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- CN104261764B CN104261764B CN201410485704.2A CN201410485704A CN104261764B CN 104261764 B CN104261764 B CN 104261764B CN 201410485704 A CN201410485704 A CN 201410485704A CN 104261764 B CN104261764 B CN 104261764B
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Abstract
The invention discloses a kind of shrinkage type concrete interface treating agent, it is characterized in that, adopted the material preparation of following proportion by weight: 1 ~ 4 part of economization agent; Ethane-acetic acid ethyenyl ester copolymer emulsion: 1 ~ 5 part; Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part; Coalescents: 0.1 ~ 0.5 part; Defoamer: 0.01 ~ 0.03 part; Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part; Portland cement: 10 ~ 30 parts; Silicon ash: 2 ~ 5 parts; Water: 50 ~ 80 parts. The invention also discloses a kind of concrete interface processing method, adopt the slurry of described interface treating agent to be attached to concrete construction joint or new-old concrete interface in the mode of spraying, improve concrete interface adhesion strength. It is comparatively simple that the present invention has technique, can significantly improve concrete interface adhesion strength, reduces the dry contraction of interface concrete and Ca (OH)2Enrichment degree, improves the advantages such as interface binding intensity better effects if.
Description
Technical field
The invention belongs to environment-friendly and energy-efficient building material technical field, be specifically related to a kind of material that can improve concrete interface adhesion strength for concrete construction joint and new-old concrete interface processing.
Background technology
Interface between the concrete of the first after-pouring in concrete structure construction seam place, or the interface between new-old concrete when structure repair, can become the weak link of xoncrete structure conventionally. The defect that the concrete interface transition region of the first after-pouring in construction joint place exists is more serious during than one-piece casting, once construction joint forms, just may destroy the globality of xoncrete structure. In addition, produce aquation process difference because the length of time is different, under temperature and dry effect of shrinking, interface primary stress possibility created fractures between concrete or the new-old concrete of first after-pouring, the moisture containing in the concrete of after-pouring and bubble also may effectively vibrate and in interface enrichment and produce defect, hydrolysis product of cement Ca (OH) owing to lacking2Form Ca (OH) aligning of concrete interface transition region2Enrichment region, above-mentioned factor acting in conjunction causes the interface binding intensity between the concrete of first after-pouring to reduce, thereby causes xoncrete structure globality, impermeability and durability to reduce. Conventionally the concrete tensile splitting strength in concrete construction joint interface be only one-piece casting concrete tensile splitting strength 30% ~ 80%. Reduce the adverse effect to concrete globality and other performances for fear of interface binding intensity, need to effectively process construction joint interface, improve the globality of xoncrete structure by improving the concrete interface binding intensity in construction joint place.
In work progress, conventionally adopt concrete interface dabbing to process and build to improve the concrete of sand coarse aggregate ratio or the mode of mortar and improve concrete interface adhesion strength. In existing " concrete structure engineering construction quality acceptance specification ", require construction joint or new-old concrete interface to process, and take measures to make new-old concrete in conjunction with tight. Existing " highway bridge and culvert construction technique normalizing " requires concrete construction joint to carry out should building after hair side processing the 1:2 cement mortar of 10 ~ 20mm, or the concrete of the about 300mm of paving thick layer, its coarse aggregate should reduce 10% than young concrete, is used as improving the interfacial agents of interface binding intensity. Adopt the method for above-mentioned specification recommends, need to layer concrete precontract 1 ~ 2h casting concrete or mortar interface agent on building, conventionally reach 20 ~ 30mm owing to building thickness, for the larger engineering of construction joint cross-sectional area, interface processing consumption of materials is larger, and workmen's labour intensity is large. And for the less member of construction joint cross-sectional area, prepare separately interfacial agents and seem comparatively loaded down with trivial details. Meanwhile, need layer concrete on fast pouring after building interfacial agents, to avoid forming new construction joint after interfacial agents initial set, also can cause workmen's labour intensity to increase. Because operation is loaded down with trivial details and raw materials consumption amount is large, a lot of engineerings are in order to reduce construction cost, mostly just carry out hair side processing and do not build mortar or concrete interface agent, cause construction joint to become the weak link of structure, and produce construction quality problem.
In Practical Project, in order to improve concrete interface adhesion strength, engineers and technicians have also developed multiple concrete interface agent. As adopt the organic materials such as vinyl acetate-ethylene emulsion, thickener, defoamer to prepare concrete interface agent to improve the interface binding intensity of new-old concrete. Admixture polymer emulsion can improve concrete interface adhesion strength, but owing to there is contraction distortion difference between new-old concrete, only improves interface binding intensity effect by polymer emulsion limited. Therefore, other patents admixture on the basis that adopts polymer emulsion has expansile inorganic material, as sulphate aluminium cement and swelling agent, wish the contraction distortion of the expansion counteracting concrete interface producing by interfacial agents, but sulphate aluminium cement premature cure speed is fast, and later strength may reduce. While adopting swelling agent modification interfacial agents, because interface exists a large amount of needle-like ettringites, porosity is higher, has open defect, and interface binding intensity increase rate is limited. Expansion component needs wet environment could effectively bring into play expansion simultaneously, and in Practical Project long-term maintenance to make concrete be difficulty comparatively in wet environment, this also causes expansion component to be difficult to produce the effect of expecting, thereby causes interfacial agents cannot bring into play the effect that improves interface binding intensity. In addition, in normal concrete structure, because cement alkalinity is higher, hydrolysis product of cement Ca (OH)2Form Ca (OH) aligning of construction joint interfacial transition zone2Enrichment region, makes interfacial transition zone become concrete weak link. Therefore, in order to eliminate Ca (OH)2Enrichment problem, just need to reduce the cement consumption of interface concrete or mortar, conventionally adopts the mode of adding coal ash in interface concrete or mortar in engineering, wishes to consume by the aquation of flyash the Ca (OH) of interfacial transition zone enrichment2Thereby, improve the density of interfacial transition zone. Because pulverized burned coal ash hydration speed is slow, reduce interfacial transition zone Ca (OH) by adding coal ash2Enrichment degree improves adhesion strength, is difficult to accomplish the end in view.
Therefore, development one both can significantly improve concrete interface adhesion strength, can reduce again the dry contraction of interface concrete and Ca (OH)2Enrichment degree there is multi-functional interfacial agents, can effectively improve the interface binding intensity of new-old concrete, become the problem that those skilled in the art require study.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical problem to be solved by this invention is: how to provide a kind of technique comparatively simple, can significantly improve concrete interface adhesion strength, reduce the dry contraction of interface concrete and Ca (OH)2Enrichment degree, improves a kind of shrinkage type concrete interface treating agent and the interface processing method thereof of interface binding intensity better effects if.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of shrinkage type concrete interface treating agent, is characterized in that, has adopted the material preparation of following proportion by weight: 1 ~ 4 part of economization agent
Ethane-acetic acid ethyenyl ester copolymer emulsion: 1 ~ 5 part
Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part
Coalescents: 0.1 ~ 0.5 part
Defoamer: 0.01 ~ 0.03 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part
Portland cement: 10 ~ 30 parts
2 ~ 5 parts of silicon ashes
Water: 50 ~ 80 parts.
In the technical program, economization agent has the function that can reduce the capillary tension in surface tension of liquid and Behavior of Hardened Cement Paste, in interfacial agents, admixture economization agent can reduce early stage dry contraction of interface young concrete, the contraction distortion that the concrete of first after-pouring is produced is coordinated mutually, thereby reduces concrete distortion difference and the shrinkage stress of the first after-pouring in interface. Ethane-acetic acid ethyenyl ester copolymer emulsion belongs to copolymer water dispersoid, is milky thick liquid, not only can significantly improve the concrete intensity in interface, and can improve the concrete anti-permeability performance in interface in interfacial agents. Described hydroxypropyl methyl cellulose ether, can play the effect of remarkable enhancing interfacial agents cohesiveness, water-retaining property, thickening property and stability. Coalescents is in more extensively constructionTemperatureIn scope, promote the material of film forming, effect is the free volume that provides enough in film forming procedure, so that emulsion particle distortion and latex molecule segment spread, are wound around and be fused into continuous film, can promote macromolecular compound Plastic Flow and strain, improve interfacial agents adhesive property. The effect of defoamer is to eliminate the foam that polymer produces in whipping process, and makes to be adsorbed on the broken bubble of foam at concrete interface place, has and can improve the density of concrete interface transition region and the effect of interface binding intensity. The effect of polycarboxylic acid series high efficiency water reducing agent is to improve the dispersiveness of cement granules, prevents that cement granules from reuniting in whipping process, can also improve fluidity of slurry. Portland cement is mainly as gel rubber material, preferentially adopts 42.5 grades of Portland cements. Silicon ash is to discharge with flue gas the industrial by-products obtaining through gathering dust in ferrosilicon smelting process, it is admixture conventional in high-strength concrete, in the technical program, silicon ash is brought into play its good pozzolanic activity as filler, with the Ca (OH) of concrete interface place enrichment2There is secondary reaction of hydration, not only can reduce interface Ca (OH)2Enrichment degree, the hole that hydrated product also can fill concrete interface, thus improve interfacial transition zone density and adhesion strength.
The concrete following steps that preferably adopt of this processor make: a, by economization agent, ethane-acetic acid ethyenyl ester copolymer emulsion, and it is for subsequent use that hydroxypropyl methyl cellulose ether, coalescents, defoamer and part water high-speed stirred make emulsion;
B, Portland cement, silicon ash are added to remaining water and polycarboxylic acid series high efficiency water reducing agent, and to stir into slurry stand-by;
C, the mixture that a step and b step are obtained mix and stir, and form the slurry of good fluidity, obtain this inorganic agent.
Like this, in a step of the technical program, generally adopt high speed agitator to stir and within 30 ~ 60 seconds, both can make liquid material mix. Described " part water " specifically refers to that adding the water the inside of described proportioning ratio total amount to deduct adds the proportional quantities after the water yield in step b. In the technical program a step, because raw material consumption is less, can adopt after the electronic scale weighing of weighing precision 0.1g and add and make its deal accurate. In the b step of the technical program, can be first by Portland cement and silicon ash mix 30 seconds in agitator, pulverulent material is mixed, then add the water of polycarboxylate water-reducer and remaining proportion, stir and can obtain cement slurry in 60 ~ 90 seconds. In c step, the polymer solution that a step is obtained joins in the cement slurry that b step obtains, and stirs and within 60 seconds, can make it even with high speed agitator, can form the interfacial agents slurry with good cohesiveness, mobility, water-retaining property.
In interfacial agents of the present invention, contain economization agent, ethane-acetic acid ethyenyl ester copolymer emulsion, defoamer, polycarboxylic acid series high efficiency water reducing agent, have the advantages that to reduce interface contraction distortion difference and improve interface binding intensity.
Interfacial agents material of the present invention can significantly improve the interface binding intensity of concrete construction joint or new-old concrete, adopt the concrete tensile splitting strength of indication interfacial agents of the present invention can reach one-piece casting concrete tensile splitting strength 85% ~ 95%.
The invention also discloses a kind of concrete interface processing method, it is characterized in that, comprise the step of first obtaining shrinkage type concrete interface treating agent as above, also comprise the slurry of this inorganic agent is evenly sprayed to concrete construction joint or new-old concrete interface, improve the step of concrete interface adhesion strength.
Like this, while adopting inorganic agent of the present invention to carry out interface processing, only need to adopt the mode of spraying can reach the effect that significantly improves concrete interface adhesion strength. Described spraying coating process belongs to the common construction technology measure in building engineering construction field, and conventional spray coating mechanical can meet construction requirement. So just reduced workmen's labour intensity, interfacial agents adopts spraying coating process construction, thereby is more conducive to applying of novel interfacial inorganic agent. In addition, while specifically carrying out interface processing, can also comprise first to interface clear up, the step such as dabbing or punching hair, but these are routine techniques, therefore not at this detailed description.
Therefore when the invention process, without adopting special mixing plant and construction equipment, preparation technology is simple, the cost of raw material is lower, can significantly improve concrete interface adhesion strength. The present invention is as the interfacial agents at concrete construction joint interface or new-old concrete interface, adopt conventional spray coating constructing technique to meet the demands, construction technology is simple, and raw materials consumption amount is low, and coating thickness can regulate according to engineering application requirements within the scope of 1 ~ 3mm.
In sum, the present invention mainly possesses following advantage:
(1) the present invention reduces concrete interface place solution surface tension and capillary pressure by admixture economization agent, can significantly reduce concrete early stage dry contraction of after-pouring, contraction distortion difference between the concrete of first after-pouring is reduced, be conducive to improve concrete interface binding intensity.
(2) the present invention, by water-soluble polymers such as admixture ethane-acetic acid ethyenyl ester copolymer emulsion, hydroxypropyl methyl cellulose ethers, makes interfacial agents have good adhesive property and water retention property.
(3) the present invention by admixture silicon ash and utilize the pozzolanic activity of silicon ash and fill effect, not only can reduce the Ca (OH) of concrete interface transition region2Enrichment degree, the hole of all right filling interface transition region of hydrated product, improves the density of concrete interface transition region, thereby significantly improves interface binding intensity.
(4) through overtesting, the interface treating agent that the present invention makes can form cohesiveness and the good cement polymer slurry of water-retaining property after being sprayed at concrete surface, slurry film forming is continuous, without obvious Bubble formation, through contrast test, after the interface treating agent that use the present invention makes, the tensile splitting strength of concrete sample can reach the more than 90% of former test specimen tensile splitting strength, has good interfacial bond property.
(5) when the invention process, each concrete steps remain common process, and construction technology is very simple, is convenient to very much apply in concrete works.
Detailed description of the invention
When concrete enforcement, this shrinkage type concrete interface treating agent has adopted the material of following quality proportioning ratio: 1 ~ 4 part of economization agent; Ethane-acetic acid ethyenyl ester copolymer emulsion: 1 ~ 5 part; Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part; Coalescents: 0.1 ~ 0.5 part; Defoamer: 0.01 ~ 0.03 part; Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part; Portland cement: 10 ~ 30 parts; Silicon ash: 2 ~ 5 parts; Water: 50 ~ 80 parts.
Applicant selects numerical example aspect performance can reach the formulation examples of outstanding effect further below, as the embodiment of Optimal Parameters, the present invention is described further.
Embodiment 1
The material component and the quality mixture ratio thereof that in the present embodiment, adopt are as follows:
1.5 parts of economization agents
Ethane-acetic acid ethyenyl ester copolymer emulsion: 2 parts
Hydroxypropyl methyl cellulose ether: 0.5 part
Coalescents: 0.5 part
Defoamer: 0.02 part
Polycarboxylic acid series high efficiency water reducing agent: 0.5 part
Portland cement: 30 parts
Silicon ash: 5 parts
Water: 60 parts
Employing following steps make: a, by for subsequent use the emulsion of the economization agent of said ratio ratio, ethane-acetic acid ethyenyl ester copolymer emulsion, hydroxypropyl methyl cellulose ether, coalescents, defoamer and part water high-speed stirring mixing; B, Portland cement, silicon ash are added to remaining water and polycarboxylic acid series high efficiency water reducing agent, and to stir into slurry stand-by; C, the mixture that a step and b step are obtained mix and stir, and form the slurry of good fluidity, obtain this inorganic agent. While being used in interface processing, the slurry that c step is obtained evenly sprays to concrete construction joint or new-old concrete interface, improves concrete interface adhesion strength as interfacial agents.
Embodiment 2
The volume of the material component adopting in the present embodiment and quality mixture ratio example thereof is as follows:
1.0 parts of economization agents
Ethane-acetic acid ethyenyl ester copolymer emulsion: 1.5 parts
Hydroxypropyl methyl cellulose ether: 0.4 part
Coalescents: 0.3 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.4 part
Portland cement: 25 parts
Silicon ash: 4 parts
Water: 67.4 parts
In the present embodiment, concrete preparation process is identical with embodiment 1 with use processing mode.
Embodiment 3
The volume of the material component adopting in the present embodiment and quality mixture ratio example thereof is as follows:
2 parts of economization agents
Ethane-acetic acid ethyenyl ester copolymer emulsion: 1.0 parts
Hydroxypropyl methyl cellulose ether: 0.2 part
Coalescents: 0.2 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.3 part
Portland cement: 20 parts
Silicon ash: 3 parts
Water: 73.3 parts
In the present embodiment, concrete preparation process is identical with embodiment 1 with use processing mode.
Embodiment 4
The volume of the material component adopting in the present embodiment and quality mixture ratio example thereof is as follows:
3.0 parts of economization agents
Ethane-acetic acid ethyenyl ester copolymer emulsion: 1.5 parts
Hydroxypropyl methyl cellulose ether: 0.3 part
Coalescents: 0.3 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 part
Portland cement: 15 parts
Silicon ash: 2 parts
Water: 77.7 parts
In the present embodiment, concrete preparation process is identical with embodiment 1 with use processing mode. Embodiment 5
The volume of the material component adopting in the present embodiment and quality mixture ratio example thereof is as follows:
4.0 parts of economization agents
Ethane-acetic acid ethyenyl ester copolymer emulsion: 5.0 parts
Hydroxypropyl methyl cellulose ether: 0.5 part
Coalescents: 0.5 part
Defoamer: 0.02 part
Polycarboxylic acid series high efficiency water reducing agent: 0.5 part
Portland cement: 10 parts
Silicon ash: 4.5 parts
Water: 75 parts
In the present embodiment, concrete preparation process is identical with embodiment 1 with use processing mode.
Experimental result
Shaping strength grade is the cube specimen that C30d is of a size of 100mm × 100mm × 100mm, under standard curing condition, maintenance is to 28d length of time, according to " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-2002) test tensile splitting strength. Drawing crack concrete sample is into two brushed off particle loosening on test specimen splitting surface with wire brush, then on splitting surface, spray respectively the interface treating agent of preparing according to embodiment 1, embodiment 3 and embodiment 5, coating thickness is about 1mm. After spraying interface treating agent, immediately two test specimens that break are bondd according to former rupture location alignment, then be placed on the tensile splitting strength of the indoor maintenance of standard curing to test specimen after test bonding again after 28d length of time, evaluate the effect of interface treating agent prepared by the present invention with the tensile splitting strength of concrete sample of spraying interface treating agent molding bonded and the ratio of the tensile splitting strength of former test specimen, this ratio is larger illustrates that the adhesion strength of interface treating agent prepared by the present invention is higher, tests and the results are shown in Table 1.
Table 1 sprays the tensile splitting strength ratio of interface treating agent front and back test specimen
| Numbering | Embodiment 1 | Embodiment 3 | Embodiment 5 |
| Tensile splitting strength ratio | 0.95 | 0.85 | 0.91 |
Can find out according to the test data of table 1, interface treating agent prepared by the present invention has good adhesive property, and the interface treating agent of preparing in the spraying the present invention of concrete construction joint or new-old concrete interface can ensure that concrete interface can not become the weak link of destroying concrete globality. Workability of the present invention is good, in the time that reality is used, can adopt spraying application, and speed of application is fast, and construction method is simple, and workmen's labour intensity significantly reduces.
Wherein the adhesive property of embodiment 1 is best, and mechanical property the best is applicable to treatment of construction joints and the repairing of beam column built from concrete member; Embodiment 3 costs are lower, can be for the interface processing between the former concrete floor in flooring place and leveling mortar or the pea gravel concreten of after-pouring; Embodiment 5 spraying applications are fastest, and film forming and Reduce shrinkage effect are good, and its adhesive property is also very good, can be for the interface processing of large section concrete construction joint.
Claims (3)
1. a shrinkage type concrete interface treating agent, is characterized in that, has adopted the material preparation of following proportion by weight: for reducing 1 ~ 4 part of the interface priority distortion difference of casting concrete and the economization agent of shrinkage stress
Ethane-acetic acid ethyenyl ester copolymer emulsion: 1 ~ 5 part
Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part
Coalescents: 0.1 ~ 0.5 part
Defoamer: 0.01 ~ 0.03 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part
Portland cement: 10 ~ 30 parts
For reducing interface Ca(OH)2The silicon ash of enrichment degree: 2 ~ 5 parts
Water: 50 ~ 80 parts.
2. shrinkage type concrete interface treating agent as claimed in claim 1, it is characterized in that, the concrete following steps that adopt make: a, by for reducing the successively distortion difference of casting concrete and the economization agent of shrinkage stress, ethane-acetic acid ethyenyl ester copolymer emulsion of interface, and it is for subsequent use that hydroxypropyl methyl cellulose ether, coalescents, defoamer and part water high-speed stirred make emulsion;
B, by Portland cement, for reducing interface Ca(OH)2The silicon ash of enrichment degree adds remaining water and polycarboxylic acid series high efficiency water reducing agent, and to stir into slurry stand-by;
C, the mixture that a step and b step are obtained mix and stir, and form the slurry of good fluidity, obtain this inorganic agent.
3. a concrete interface processing method, it is characterized in that, comprise the step of obtaining shrinkage type concrete interface treating agent as prepared in claim 2, also comprise the slurry of this inorganic agent is sprayed to concrete construction joint or new-old concrete interface, improve the step of concrete interface adhesion strength.
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Families Citing this family (6)
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| CN106495609A (en) * | 2016-11-02 | 2017-03-15 | 常州市鼎升环保科技有限公司 | A kind of preparation method of high bond strength concrete interface treating agent |
| CN106746836B (en) * | 2017-01-10 | 2020-01-07 | 广西壮族自治区水利科学研究院 | High-adhesion corrosion-resistant concrete interface treating agent and application thereof |
| CN114105546A (en) * | 2021-12-27 | 2022-03-01 | 四川省川铁枕梁工程有限公司 | Method for improving bonding strength of concrete interface by spraying silica mortar |
| CN114263366A (en) * | 2021-12-27 | 2022-04-01 | 四川省川铁枕梁工程有限公司 | High-adhesion concrete interface bonding method |
| CN115700230A (en) * | 2022-10-26 | 2023-02-07 | 中交路桥建设有限公司 | Interface agent for enhancing interface bonding performance of new and old concrete and construction method thereof |
| CN115745470B (en) * | 2022-11-11 | 2023-07-21 | 河海大学 | Cement-based material interface reinforcing agent and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265055A (en) * | 2008-04-02 | 2008-09-17 | 苏州大学 | High bond strength dry powder interface processing agent |
| CN101302093A (en) * | 2008-05-28 | 2008-11-12 | 厦门市建筑科学研究院集团股份有限公司 | Formula of air-entrained concrete interface treating agent and construction method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265055A (en) * | 2008-04-02 | 2008-09-17 | 苏州大学 | High bond strength dry powder interface processing agent |
| CN101302093A (en) * | 2008-05-28 | 2008-11-12 | 厦门市建筑科学研究院集团股份有限公司 | Formula of air-entrained concrete interface treating agent and construction method thereof |
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