CN104261764A - Shrinkage-reducing type concrete interface treating agent and interface treatment method thereof - Google Patents
Shrinkage-reducing type concrete interface treating agent and interface treatment method thereof Download PDFInfo
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- CN104261764A CN104261764A CN201410485704.2A CN201410485704A CN104261764A CN 104261764 A CN104261764 A CN 104261764A CN 201410485704 A CN201410485704 A CN 201410485704A CN 104261764 A CN104261764 A CN 104261764A
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Abstract
The invention discloses a shrinkage-reducing type concrete interface treating agent. The shrinkage-reducing type concrete interface treating agent is characterized by being prepared from the following materials in parts by weight: 1-4 parts of a shrinkage-reducing agent, 1-5 parts of an ethylene-vinyl acetate copolymer emulsion, 0.2-0.5 part of hydroxypropyl methyl cellulose ether, 0.1-0.5 part of a film-forming auxiliary agent, 0.01-0.03 part of a defoaming agent, 0.2-0.5 part of a polycarboxylic high-efficiency water-reducing agent, 10-30 parts of ordinary Portland cement, 2-5 parts of silica fume and 50-80 parts of water. The invention also discloses a concrete interface treatment method, namely a method for improving the concrete interface bonding strength by adhering slurry of the interface treating agent to concrete construction joints or new-old concrete interfaces by virtue of a spray coating mode. The shrinkage-reducing type concrete interface treating agent disclosed by the invention has the advantages that the shrinkage-reducing type concrete interface treating agent is relatively simple in process, can be used for significantly improving the concrete interface bonding strength and reducing the concrete drying shrinkage at the interfaces and the enrichment degree of Ca(OH)2, and has a better effect on improving the interface bonding strength.
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 cohesive 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 interface during structure repair between new-old concrete, can become the weak link of concrete structure usually.The defect of the concrete interface zone of transition existence of the first after-pouring in construction joint place is than more serious during one-piece casting, and construction joint, once be formed, just may destroy the globality of concrete structure.In addition, because the length of time is different and produce heat evolution velocity difference, under the effect of temperature and dry shrinkage, interface initial stress between the concrete of first after-pouring or new-old concrete may created fractures, the moisture contained in the concrete of after-pouring and bubble also may effectively to vibrate owing to lacking and to produce defect, hydrolysis product of cement Ca (OH) in interface enrichment
2ca (OH) is formed aligning of concrete interface zone of transition
2enrichment region, above-mentioned factor acting in conjunction causes the interface binding intensity between the concrete of first after-pouring to reduce, thus causes concrete structure globality, impermeability and weather resistance to reduce.The concrete tensile splitting strength in usual concrete construction joint interface is only 30% ~ 80% of the concrete tensile splitting strength of one-piece casting.In order to avoid interface binding intensity reduces the disadvantageous effect to concrete globality and other performances, needing effectively to process construction joint interface, improving the globality of concrete structure by improving the concrete interface binding intensity in construction joint place.
In construction process, usually adopt concrete interface dabbing process and build and improve the concrete of sand coarse aggregate ratio or the mode of mortar to improve concrete interface cohesive strength.Require in existing " concrete structure engineering construction quality accident specification " should process construction joint or new-old concrete interface, and take measures to make conjunction old and new concret tight.The 1:2 sand-cement slurry of 10 ~ 20mm should be built after existing " highway bridge and culvert construction technique normalizing " requires concrete construction joint to carry out hair side process, or paving thick layer is about the concrete of 300mm, its coarse aggregate should reduce 10% than young concrete, is used as the interfacial agents improving interface binding intensity.Adopt the method for above-mentioned specification recommends, need layer concrete precontract 1 ~ 2h casting concrete or mortar interface agent on building, usually reach 20 ~ 30mm owing to building thickness, for the engineering that construction joint cross-sectional area is larger, interface processing consumption of materials is comparatively large, and workmen's labour intensity is large.And for the less component of construction joint cross-sectional area, preparation interfacial agents seems comparatively loaded down with trivial details separately.Meanwhile, after building interfacial agents, need layer concrete on fast pouring, after avoiding interfacial agents initial set, form new construction joint, workmen's labour intensity also can be caused to increase.Because the loaded down with trivial details and raw materials consumption amount of operation is large, a lot of engineering, in order to reduce construction cost, is mostly just carried out hair side process and is not built mortar or concrete interface agent, causes construction joint to become the weak link of structure, and produces construction quality problem.
In Practical Project, in order to improve concrete interface cohesive strength, engineering technical personnel also developed multiple concrete interface agent.Concrete interface agent is prepared to improve the interface binding intensity of new-old concrete as adopted the organic-based material such as vinyl acetate-ethylene emulsion, thickening material, defoamer.Admixture polymer emulsion can improve concrete interface cohesive strength, but owing to there is shrinkage strain difference between new-old concrete, improves interface binding intensity limited efficiency only by polymer emulsion.Therefore, other patents admixture on the basis adopting polymer emulsion has expansile inorganic materials, as aluminosulfate cement and swelling agent, wish that the shrinkage strain of concrete interface is offset in the expansion produced by interfacial agents, but aluminosulfate cement premature cure speed is fast, and later strength may reduce.When adopting swelling agent modifying interface agent, because interface exists a large amount of needle-like ettringite, porosity is higher, there is open defect, and interface binding intensity increase rate is limited.Expansion component needs wet environment effectively could play expansion simultaneously, and in Practical Project long-term maintenance make concrete be in wet environment be comparatively difficulty, this also causes expansion component to be difficult to produce the effect expected, thus causes interfacial agents cannot play the effect improving interface binding intensity.In addition, in normal concrete structure, because cement alkalinity is higher, hydrolysis product of cement Ca (OH)
2ca (OH) is formed aligning of construction joint interfacial transition zone
2enrichment region, makes interfacial transition zone become concrete weak link.Therefore, in order to eliminate Ca (OH)
2enrichment problem, just needs the cement consumption reducing interface concrete or mortar, is typically employed in the mode of adding coal ash in interface concrete or mortar in engineering, wishes that the aquation by flyash consumes the Ca (OH) of interfacial transition zone enrichment
2, thus 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 ash
2enrichment degree improves cohesive strength, is difficult to accomplish the end in view.
Therefore, development one both can significantly improve concrete interface cohesive strength, can reduce again interface concrete drying shrinkage and Ca (OH)
2enrichment degree there is multi-functional interfacial agents, so that the interface binding intensity of new-old concrete effectively can be improved, 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 cohesive strength, reduce interface concrete drying shrinkage 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, present invention employs following technical scheme:
A kind of shrinkage type concrete interface treating agent, is characterized in that, have employed the material preparation of following proportion by weight: economization agent 1 ~ 4 part
Ethylene-vinyl acetate c emulsion: 1 ~ 5 part
Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part
Film coalescence aid: 0.1 ~ 0.5 part
Defoamer: 0.01 ~ 0.03 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part
Ordinary Portland cement: 10 ~ 30 parts
Silicon ash 2 ~ 5 parts
Water: 50 ~ 80 parts.
In the technical program, economization agent has the function of the capillary tension that can reduce in surface tension of liquid and Behavior of Hardened Cement Paste, in interfacial agents, admixture economization agent can reduce the early stage dry shrinkage of interface young concrete, the shrinkage strain that the concrete of first after-pouring is produced is coordinated mutually, thus reduces concrete uneven deformation and the string stress of the first after-pouring in interface.Ethylene-vinyl acetate c emulsion belongs to copolymer water dispersoid, is oyster white thick liquid, in interfacial agents, not only can significantly improve the concrete intensity in interface, and can improve the concrete anti-permeability performance in interface.Described hydroxypropyl methyl cellulose ether, can play the effect significantly strengthening interfacial agents cohesiveness, water-retentivity, thickening property and stability.Film coalescence aid is more extensively being constructed
temperaturethe material of film forming is promoted in scope, effect is in film process, provide enough free volumes, to make emulsion particle distortion and the diffusion of latex molecule segment, be wound around and be fused into continuous film, macromolecular compound plastic flow and recoverable deformation can be promoted, improve interfacial agents adhesive property.The effect of defoamer is the foam that elimination polymkeric substance produces in whipping process, and makes the broken bubble of foam being adsorbed on concrete interface place, has and can improve the density of concrete interface zone of transition and the effect of interface binding intensity.The effect of polycarboxylic acid series high efficiency water reducing agent is the dispersiveness improving cement granules, prevents cement granules from reuniting in whipping process, can also improve fluidity of slurry.Ordinary Portland cement, mainly as gelatinous material, preferentially adopts 42.5 grades of ordinary Portland cements.Silicon ash discharges with flue gas the industrial by-products obtained through gathering dust in ferrosilicon smelting process, it is adulterant conventional in high-strength concrete, in the technical program, silicon ash plays its good pozzolanic activity as filler, with the Ca (OH) of concrete interface place enrichment
2there is secondary reaction of hydration, not only can reduce interface Ca (OH)
2enrichment degree, hydrated product also can the hole of fill concrete interface, thus improves interfacial transition zone density and cohesive strength.
Present treatment machine specifically preferably adopts following steps to obtain: a, by economization agent, ethylene-vinyl acetate c emulsion, it is for subsequent use that hydroxypropyl methyl cellulose ether, film coalescence aid, defoamer and part water high-speed stirring obtain emulsion;
B, ordinary Portland cement, silicon ash being added remaining water and polycarboxylic acid series high efficiency water reducing agent, to stir into slurry stand-by;
C, the mixture that a step and b step obtain mixed and stirs, forming the slurry of good fluidity, obtain present treatment agent.
Like this, in a step of the technical program, general employing high speed agitator stirs and liquid-like material within 30 ~ 60 seconds, both can have been made to mix.Described " part water " specifically refer to add described ratio total amount water inside deduct in step b the proportional after adding the water yield.In the technical program a step, because raw material usage is less, add after the electronic scale weighing of weighing precision 0.1g can be adopted and make its deal accurate.In the b step of the technical program, can the first mix 30 seconds in agitator by ordinary Portland cement and silicon ash, powder material is mixed, then adds the water of polycarboxylate water-reducer and remaining proportion, stir and can obtain cement slurry in 60 ~ 90 seconds.In step c, the polymers soln that a step obtains is joined in the cement slurry that b step obtains, stir with high speed agitator and it within 60 seconds, can be made even, the interfacial agents slurry with good cohesiveness, mobility, water-retentivity can be formed.
Containing economization agent, ethylene-vinyl acetate c emulsion, defoamer, polycarboxylic acid series high efficiency water reducing agent in interfacial agents of the present invention, have the advantages that to reduce interface shrinkage uneven deformation and improve interface binding intensity.
Interfacial agent material of the present invention can significantly improve the interface binding intensity of concrete construction joint or new-old concrete, adopts the concrete tensile splitting strength of indication interfacial agents of the present invention can reach 85% ~ 95% of the concrete tensile splitting strength of one-piece casting.
The invention also discloses a kind of concrete interface treatment process, it is characterized in that, comprise the step first obtaining shrinkage type concrete interface treating agent as above, also to comprise the slurry even application of this treatment agent to concrete construction joint or new-old concrete interface, improve the step of concrete interface cohesive strength.
Like this, when adopting treatment agent of the present invention to carry out interface processing, only the mode of spraying need be adopted can to reach the effect significantly improving concrete interface cohesive 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.This reduces the labour intensity of workmen, interfacial agents adopts spraying coating process construction, thus is more conducive to applying of novel interfacial treatment agent.In addition, when specifically carrying out interface processing, can also comprise first interface is cleared up, dabbing or rush the steps such as hair, but these are routine techniques, therefore do not describe in detail at this.
Therefore during the invention process, without the need to adopting special whipping device and preparation of construction, preparation technology is simple, and material cost is lower, can significantly improve concrete interface cohesive strength.The present invention is as the interfacial agents at concrete construction joint interface or new-old concrete interface, conventional spray coating constructing technique is adopted to meet the demands, construction technology is simple, and raw materials consumption amount is low, and coating thickness can require to regulate according to engineer applied 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, significantly can reduce the concrete early stage dry shrinkage of after-pouring, shrinkage strain difference between the concrete of first after-pouring is reduced, is conducive to improving concrete interface binding intensity.
(2) the present invention is by water-soluble polymerss such as admixture ethylene-vinyl acetate c emulsion, hydroxypropyl methyl cellulose ethers, makes interfacial agents have good adhesive property and water retention property.
(3) the present invention utilizes pozzolanic activity and the filling effect of silicon ash by admixture silicon ash, not only can reduce the Ca (OH) of concrete interface zone of transition
2enrichment degree, the hole of all right filling interface zone of transition of hydrated product, improves the density of concrete interface zone of transition, thus significantly improves interface binding intensity.
(4) through overtesting, cohesiveness and the good cement polymer slurry of water-retentivity can be formed after the interface treating agent that the present invention obtains is sprayed at concrete surface, slurry film forming is continuous, produce without obvious bubble, through simultaneous test, after the interface treating agent using the present invention to obtain, the tensile splitting strength of concrete sample can reach more than 90% of former test specimen tensile splitting strength, has good interfacial bond property.
(5) during the invention process, each concrete steps remain ordinary process, and construction technology is very simple, is convenient to very much apply in concrete works.
Embodiment
During concrete enforcement, this shrinkage type concrete interface treating agent have employed the material of following quality ratio: economization agent 1 ~ 4 part; Ethylene-vinyl acetate c emulsion: 1 ~ 5 part; Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part; Film coalescence aid: 0.1 ~ 0.5 part; Defoamer: 0.01 ~ 0.03 part; Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part; Ordinary 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 parameters optimization, is described further the present invention.
Embodiment 1
The material component adopted in the present embodiment and quality mixture ratio as follows:
Economization agent 1.5 parts
Ethylene-vinyl acetate c emulsion: 2 parts
Hydroxypropyl methyl cellulose ether: 0.5 part
Film coalescence aid: 0.5 part
Defoamer: 0.02 part
Polycarboxylic acid series high efficiency water reducing agent: 0.5 part
Ordinary Portland cement: 30 parts
Silicon ash: 5 parts
Water: 60 parts
Employing following steps obtain: a, by for subsequent use for the emulsion of the economization agent of said ratio ratio, ethylene-vinyl acetate c emulsion, hydroxypropyl methyl cellulose ether, film coalescence aid, defoamer and part water high-speed stirring mixing; B, ordinary Portland cement, silicon ash being added remaining water and polycarboxylic acid series high efficiency water reducing agent, to stir into slurry stand-by; C, the mixture that a step and b step obtain mixed and stirs, forming the slurry of good fluidity, obtain present treatment agent.When being used in interface processing, slurry even application step c obtained, to concrete construction joint or new-old concrete interface, improves concrete interface cohesive strength as interfacial agents.
Embodiment 2
The volume of the material component adopted in the present embodiment and quality mixture ratio example thereof is as follows:
Economization agent 1.0 parts
Ethylene-vinyl acetate c emulsion: 1.5 parts
Hydroxypropyl methyl cellulose ether: 0.4 part
Film coalescence aid: 0.3 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.4 part
Ordinary 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 adopted in the present embodiment and quality mixture ratio example thereof is as follows:
Economization agent 2 parts
Ethylene-vinyl acetate c emulsion: 1.0 parts
Hydroxypropyl methyl cellulose ether: 0.2 part
Film coalescence aid: 0.2 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.3 part
Ordinary 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 adopted in the present embodiment and quality mixture ratio example thereof is as follows:
Economization agent 3.0 parts
Ethylene-vinyl acetate c emulsion: 1.5 parts
Hydroxypropyl methyl cellulose ether: 0.3 part
Film coalescence aid: 0.3 part
Defoamer: 0.01 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 part
Ordinary 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 adopted in the present embodiment and quality mixture ratio example thereof is as follows:
Economization agent 4.0 parts
Ethylene-vinyl acetate c emulsion: 5.0 parts
Hydroxypropyl methyl cellulose ether: 0.5 part
Film coalescence aid: 0.5 part
Defoamer: 0.02 part
Polycarboxylic acid series high efficiency water reducing agent: 0.5 part
Ordinary 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 normal curing condition, maintenance is to 28d length of time, tests tensile splitting strength according to " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2002).Brushed off by the particle that test specimen splitting surface loosens by drawing crack concrete sample wire brush into two, on splitting surface, then spray the interface treating agent according to the preparation of embodiment 1, embodiment 3 and embodiment 5 respectively, coating thickness is about 1mm.Immediately two test specimens broken are bondd according to former rupture location alignment after spraying interface treating agent, then the tensile splitting strength of test specimen after test bonding again after the indoor maintenance of normal curing to 28d length of time is placed on, the effect of interface treating agent prepared by the present invention is evaluated with the ratio of the tensile splitting strength of the tensile splitting strength and former test specimen that spray the concrete sample of interface treating agent molding bonded, this ratio is larger, illustrates that the cohesive 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 test specimen before and after interface treating agent
| Numbering | Embodiment 1 | Embodiment 3 | Embodiment 5 |
| Tensile splitting strength ratio | 0.95 | 0.85 | 0.91 |
Testing data according to table 1 can be found out, interface treating agent prepared by the present invention has good adhesive property, sprays interface treating agent prepared by the present invention can ensure that concrete interface can not become the weak link destroying concrete globality at concrete construction joint or new-old concrete interface.Workability of the present invention is good, can adopt spraying application when reality uses, and speed of application is fast, and constructional method is simple, and the labour intensity of workmen significantly reduces.
Wherein the adhesive property of embodiment 1 is best, and mechanical property is best, is applicable to treatment of construction joints and the repairing of beam column built from concrete component; Embodiment 3 cost is lower, may be used for the interface processing between the leveling mortar of the former concrete floor in flooring place and after-pouring or pea gravel concreten; Embodiment 5 spraying application is fastest, film forming and Reduce shrinkage effect good, and its adhesive property is also very good, may be used for the interface processing of big cross section concrete construction joint.
Claims (3)
1. a shrinkage type concrete interface treating agent, is characterized in that, have employed the material preparation of following proportion by weight: economization agent 1 ~ 4 part
Ethylene-vinyl acetate c emulsion: 1 ~ 5 part
Hydroxypropyl methyl cellulose ether: 0.2 ~ 0.5 part
Film coalescence aid: 0.1 ~ 0.5 part
Defoamer: 0.01 ~ 0.03 part
Polycarboxylic acid series high efficiency water reducing agent: 0.2 ~ 0.5 part
Ordinary Portland cement: 10 ~ 30 parts
Silicon ash: 2 ~ 5 parts
Water: 50 ~ 80 parts.
2. shrinkage type concrete interface treating agent as claimed in claim 1, it is characterized in that, concrete employing following steps obtain: a, by economization agent, ethylene-vinyl acetate c emulsion, it is for subsequent use that hydroxypropyl methyl cellulose ether, film coalescence aid, defoamer and part water high-speed stirring obtain emulsion;
B, ordinary Portland cement, silicon ash being added remaining water and polycarboxylic acid series high efficiency water reducing agent, to stir into slurry stand-by;
C, the mixture that a step and b step obtain mixed and stirs, forming the slurry of good fluidity, obtain present treatment agent.
3. a concrete interface treatment process, it is characterized in that, comprise the step of the shrinkage type concrete interface treating agent obtained obtained by claim 2, also comprise and the slurry of this treatment agent is sprayed to concrete construction joint or new-old concrete interface, improve the step of concrete interface cohesive strength.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106746836A (en) * | 2017-01-10 | 2017-05-31 | 广西壮族自治区水利科学研究院 | A kind of bonding high corrosion-resistant type concrete interface treating agent and application |
| 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 |
| CN115745470A (en) * | 2022-11-11 | 2023-03-07 | 河海大学 | Cement-based material interface reinforcing agent and preparation method and application thereof |
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| 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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| CN101265055A (en) * | 2008-04-02 | 2008-09-17 | 苏州大学 | High bond strength dry powder interface processing agent |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106746836A (en) * | 2017-01-10 | 2017-05-31 | 广西壮族自治区水利科学研究院 | A kind of bonding high corrosion-resistant type concrete interface treating agent and application |
| 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 |
| CN115745470A (en) * | 2022-11-11 | 2023-03-07 | 河海大学 | Cement-based material interface reinforcing agent and preparation method and application 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 |
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