CN101230244A - Self-seepage concrete crack repairing glue and method for making same - Google Patents
Self-seepage concrete crack repairing glue and method for making same Download PDFInfo
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- CN101230244A CN101230244A CNA2008100185568A CN200810018556A CN101230244A CN 101230244 A CN101230244 A CN 101230244A CN A2008100185568 A CNA2008100185568 A CN A2008100185568A CN 200810018556 A CN200810018556 A CN 200810018556A CN 101230244 A CN101230244 A CN 101230244A
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Abstract
The invention discloses a self-permeating concrete crack repairing glue and the preparing method thereof, which is characterized in that after mixing and stirring evenly 10-15 percent vinyl polyurethane with 10-60 percent vinyl monomer, 10-60 percent unsaturated epoxy resin, 0.1-10 percent accelerant, and 0.01-1 percent polymerization inhibitor according to the weight proportions each constituent accounting for, the main constituent A is obtained when the above mixture is discharged; after mixing and stirring evenly 60-90 percent plasticizing agent with 1-35 percent silane resin acceptor and 1-5 percent evocating agent, and then the accessory constituent B is obtained after the above mixture is discharged. Before in use, main constituent A and accessory constituent B are required to be packed separately, and during in use, the main constituent A and accessory constituent B are required to be mixed together by mixing proportion according to requirements. The invention integrates the advantages of the polyurethane, the epoxy resin, and the acrylic ester into a whole; has the advantages of low viscosity coefficient, self-permeability, quick firming, high strength, high durability and simple operation; can be used for repairing the cracks of the road, the dam or the airdrome.
Description
Technical field
The invention belongs to building material technical field, particularly be used for the self-seepage concrete crack repairing glue on road, dam or airport and preparation method thereof.
Background technology
Concrete is one of the most widely used material of construction in the engineering construction.In actual engineering, reasons such as, construction quality improper owing to the influence of buildings envrionment conditions of living in, design, it is comparatively common that concrete produces disease such as crack.
In the prior art, a kind of Resins, epoxy slurries that Chinese patent CN86104918A mentions, the most outstanding advantage is that the viscosity of slurries is less, but its set time is longer, needs a few hours to several days usually; And repairing work generally all wishes with the reduction of erection time, to raise the efficiency in the short presetting period.
The acrylic acid or the like patching material has the fast solidified characteristics of low viscosity, and volumetric shrinkage is big, the shortcoming of hot sticky cold crisp but exist.A kind of quick-setting structural acrylic tamanori of Chinese patent CN1198460 report, it is a kind of two-component structure adhesive based on vinyl urethane and acrylic acid or the like, it is fast to have a set time, the advantage that cohesive strength is high, but owing to need to add the sequestrant of transition metal in its prescription, also need to make active thinner with the dihydropyridine that replaces, more loaded down with trivial details.
The polyurethane type resin injection material is a kind of material of squeegeeing preferably, and this type of material cementing properties is good, and good springiness is low temperature resistant, antifatigue, but viscosity is all very big usually, is not suitable for repairing finedraw.A kind of double-component polyurethane paste for sealing in building and the production technique of Chinese patent CN1247882A report, its two component polyurethane is with the NCO end-blocking, and viscosity reaches more than the 200cps, but big viscosity is not suitable for repairing finedraw.
A kind of sealing adhesive for crack on road of Chinese patent CN1376756 report has good cementability and elasticity, can be used for the crack and repairs; But its viscosity is bigger, and makees solvent with toluene, not enough environmental protection.
A kind of environmental type polymer emulsion inorganic powder and the nano material composite modified emulsified bitumen crack repair material of Chinese patent CN101081933 report, but because it is a water-latex type, the water evaporation rate is slow, and the repair sheets water cure is slow, is not suitable for repairing the occasion use fast.
Summary of the invention
The objective of the invention is to propose a kind of self-seepage concrete crack repairing glue and preparation method thereof, reach the advantage that has urethane, acrylate and Resins, epoxy concurrently, have low viscosity, oozing property, fast curing, high strength, high characteristics durable and easy and simple to handle certainly, can be applicable to the crack repairing work on road, dam or airport, solve a crack difficult problem.
Self-seepage concrete crack repairing glue of the present invention is divided into two kinds of prescriptions that separate of major constituent A and side ingredient B before it is characterized in that using, moiety wherein and in component separately shared mass ratio as follows:
Major constituent A: vinyl urethane 10～50%
Vinyl monomer 10～60%
Unsatured epoxy resin 10～60%
Promotor 0.1～10%
Stopper 0.01～1%
Side ingredient B: softening agent 60～90%
Silane coupling agent 1～35%
Initiator 1～5%.
The preparation method of above-mentioned self-seepage concrete crack repairing glue of the present invention, it is characterized in that by each moiety in component separately shared mass ratio with the stopper mixing and stirring of 10～50% vinyl urethane, 10～60% vinyl monomer, 10～60% unsatured epoxy resin, 0.1～10% promotor and 0.01～1% after the discharging packing, promptly get major constituent A; Discharging after softening agent with 10～90%, 1～10% silane coupling agent and 1～5% the initiator mixing and stirring promptly gets side ingredient B; Before using major constituent A and side ingredient B are packed respectively, major constituent A and side ingredient B are mixed during use again, major constituent A is 50: 1～10 with the fit quality ratio of side ingredient B.
Described vinyl monomer comprises vinylformic acid, butyl acrylate, ethyl propenoate, propyl acrylate, methyl acrylate, methyl methacrylate, methacrylic acid, carbonatoms is no more than 20 alkyl acrylate in the alkyl, alkyl methacrylate, acrylamide, Methacrylamide, vinylbenzene, alpha-alkyl phenylethylene, vinyl cyanide, methacrylonitrile, the ethene methyl esters, the ethene ethyl ester, the ethene propyl ester, the ethene butyl ester, hydroxyethyl methylacrylate, Rocryl 410 and/or senecioate-hydroxypropyl acrylate.
Described unsatured epoxy resin comprises undersaturated bisphenol A type epoxy resin, E type Resins, epoxy, epoxy furfural acetone resin or polybutadiene epoxy resin.
Described promotor comprises vulkacit H, N, accelerine N, accelerine, dimethylamine or dibenzylamine.
Described stopper comprises Resorcinol, meta-cresol, p-cresol or MEHQ.
Described softening agent comprises dimethyl phthalate, dibutyl phthalate or dioctyl phthalate (DOP).
Described initiator comprises benzoyl peroxide, Potassium Persulphate, ammonium persulphate, Diisopropyl azodicarboxylate, hydrogen peroxide, the hydrogen peroxide tert-butyl ester, formaldehyde, xitix, sodium sulfoxylate formaldehyde, sodium metabisulphite or ferrous ammonium sulphate.
The most outstanding advantage of crack repair sheets of the present invention is that the viscosity of system is less, by the cooperate ratio of adjustment major constituent A with side ingredient B, can regulate it and solidify in dozens of minutes at several minutes; For the shallow-layer crack treatment, do not need pressure grouting, directly mixed resin is poured on the seam face, just can own in trickle distress in concrete, permeate, so become from oozing type crack repair sheets.Existing many renovation techniques and product or effect are unsatisfactory, or preparation or use complicatedly, or cost an arm and a leg, or can not adapt to the various different condition of construction that changing.Compare with the elastic epoxy chemical grouting material slurries that Chinese patent CN86104918A is proposed, its viscosity is less, is polymerizing curable progressively, and set time is normal, is unfavorable for accelerating the duration; And the present invention makes unsatured epoxy resin, acrylate and unsaturated polyurethanes finish curing reaction by radical polymerization, because radical polymerization has fast response and fast terminated characteristics, only need set time several minutes to dozens of minutes, solved long problem set time.Compare with the quick-setting structural acrylic tamanori that Chinese patent CN1198460 is proposed, though it has acrylic resin fast advantage set time, but owing to need to add the sequestrant of transition metal in its prescription, also need to make active thinner with the dihydropyridine that replaces, more loaded down with trivial details; Crack of the present invention repair sheets do not need to use the sequestrant of transition metal and dihydropyridine to make active thinner, only make thinner with vinyl monomer, have simplified raw material, and the preparation method is simple.Compare with the double-component polyurethane paste for sealing in building that Chinese patent CN1247882A is proposed, though it is good that it has a polyurethanes cementing properties, good springiness, low temperature resistant, fatigue proof advantage, but viscosity is greatly to more than the 200cps, be not suitable for the finedraw construction, and crack of the present invention repair sheets glue adopts vinyl monomer that vinyl urethane is done dilution, viscosity has only 10～50cps during use, solve the big problem of viscosity, be fit to the repairing of tiny seam.Compare with the sealing adhesive for crack on road of Chinese patent CN1376756 report, because it uses toluene to make solvent, not enough environmental protection; And the present invention also does organic solvent without benzene, dimethylbenzene without toluene, but adopts vinyl monomer to do dilution, and vinyl monomer solidifies the back and becomes superpolymer, and is non-volatile, solved the problem of the not enough environmental protection of glue.Compare with nano material composite modified emulsified bitumen crack repair material with the environmental type polymer emulsion inorganic powder of Chinese patent CN101081933 report, because it is to finish the glue curing reaction by the volatilization of water, the water volatilization is slow, therefore glue solidifies slow, need to be not suitable for repairing fast occasion more than 24 hours; And crack of the present invention repair sheets are to finish curing reaction by Raolical polymerizable, only need set time several minutes to arrive dozens of minutes.In sum, crack of the present invention repair sheets integrate advantage with the advantage performance complement of urethane, acrylate and Resins, epoxy three big resins, are particularly suitable for reaching quick repairing purpose occasion, and not with an organic solvent, not a kind of crack repair sheets of environment-friendly type.
Embodiment:
Below in conjunction with specific embodiment, further set forth the present invention.
Embodiment 1:
Before preparation major constituent A, prepare vinyl urethane earlier, concrete preparation method is as follows:
N-210 polyoxypropyleneglycol 58 grams and the diphenylmethanediisocyanate 50 that take by weighing after the vacuum hydro-extraction restrain, add in the there-necked flask, controlled temperature reacted 2 hours under mechanical stirring at 60 ℃, add Rocryl 410 34 grams again, be warmed up to 90 ℃ of reactions after 2 hours, be cooled to 25 ℃, discharging promptly gets vinyl urethane.
In the 2000ml there-necked flask, add vinyl urethane 100 grams, Rocryl 410 500 grams, unsatured epoxy resin 500 grams, dimethyl benzylamine 2.2 grams and Resorcinol 0.5 gram successively, stir, promptly get major constituent A.
Dimethyl phthalate 49 grams, benzoyl peroxide 36 grams and silane coupling agent 2 grams are mixed, stir, promptly obtain side ingredient B.
The testing method of product performance:
Tensile strength: press GB/T2568-1995, with XLM-smart electronics pulling experiment machine (Jinan blue streak) test, draw speed is 200mm/min;
Viscosity: with the viscosity of NDJ-T9 type rotational viscosimeter (dynamo-electric factory of Tongji University) test mixing glue;
Hardness: adopt the test of Shao Shi D sclerometer.
Result of use:
When 1, using by quality than major constituent A: side ingredient B=50: 1 configuration slurries, inject the crack behind the thorough mixing, 5 minutes glues begin to solidify, glue completion of cure after 20 minutes, the crack is repaired and is finished.The performance that records this example proportioning product by above-mentioned testing method is: 20 minutes set times, viscosity 30cps during application, 22 ℃ of Shao D hardness 75, ultimate compression strength 30MPa.
When 2, using by quality than major constituent A: side ingredient B=50: 10 configuration slurries, inject the crack behind the thorough mixing, 3 minutes glues begin to solidify, glue completion of cure after 10 minutes, the crack is repaired and is finished.The performance that records this example proportioning product by above-mentioned testing method is: 10 minutes set times, viscosity 32cps during application, 22 ℃ of Shao D hardness 76, tensile strength 32MPa.
Embodiment 2:
In the 2000ml there-necked flask, add vinyl urethane 300 grams, butyl methacrylate 600 grams, unsatured epoxy resin 100 grams, dimethyl benzylamine 2.2 grams and Resorcinol 0.5 gram successively, stir, promptly get major constituent A.
Dibutyl phthalate 49 grams, benzoyl peroxide 36 grams and silane coupling agent 30 grams are mixed, stir, promptly obtain side ingredient B.
The testing method of product performance is with embodiment 1.
During use by quality than major constituent A: side ingredient B=50: 10 configuration slurries, inject the crack behind the thorough mixing, 3 minutes glues begin to solidify, glue completion of cure after 10 minutes, the crack is repaired and is finished.The performance that records present embodiment proportioning product is: 10 minutes set times, viscosity 30cps during application, 22 ℃ of Shao D hardness 65, ultimate compression strength 28MPa.
Embodiment 3:
In the 2000ml there-necked flask, add vinyl urethane 100 grams, methyl methacrylate 200 grams, butyl acrylate 100 grams, unsatured epoxy resin 600 grams, dimethyl benzylamine 10 grams and Resorcinol 1 gram successively, stir, promptly get major constituent A.
Dimethyl phthalate 90 grams, Diisopropyl azodicarboxylate 5 grams and KH550 silane coupling agent 5 grams are mixed, stir, promptly obtain side ingredient B.
Testing method is with embodiment 1.
During use by quality than major constituent A: side ingredient B=50: 5 configuration slurries, inject the crack behind the thorough mixing, 4 minutes glues begin to solidify, glue completion of cure after 15 minutes, the crack is repaired and is finished.The performance that records present embodiment proportioning product is: 15 minutes set times, viscosity 50cps during application, 22 ℃ of Shao D hardness 55, ultimate compression strength 38MPa.
Embodiment 4:
In the 2000ml there-necked flask, add vinyl urethane 500 grams, methyl methacrylate 300 grams, butyl acrylate 100 grams, unsatured epoxy resin 100 grams, dimethyl benzylamine 0.5 gram and Resorcinol 0.01 gram successively, stir, promptly get major constituent A.
Dioctyl phthalate (DOP) 90 grams, benzoyl peroxide 5 grams and KH550 silane coupling agent 5 grams are mixed, stir, promptly obtain side ingredient B.
Testing method is with embodiment 1.
During use by quality than major constituent A: side ingredient B=50: 5 configuration slurries, inject the crack behind the thorough mixing, 5 minutes glues begin to solidify, glue completion of cure after 30 minutes, the crack is repaired and is finished.The performance that records present embodiment proportioning product is: 30 minutes set times, viscosity 48cps during application, 22 ℃ of Shao D hardness 50, ultimate compression strength 33MPa.
Embodiment 5:
In the 2000ml there-necked flask, add vinyl urethane 100 grams, Rocryl 410 100 grams, methyl methacrylate 500 grams, butyl acrylate 100 grams, vinylbenzene 100, unsatured epoxy resin 100 grams, dimethyl benzylamine 10 grams and Resorcinol 1 gram successively, stir, promptly get major constituent A.
Dimethyl phthalate 60 grams, benzoyl peroxide 35 grams and KH550 silane coupling agent 5 grams are mixed, stir, promptly obtain side ingredient B.
Testing method is with embodiment 1.
During use by quality than major constituent A: side ingredient B=50: 1 configuration slurries, inject the crack behind the thorough mixing, 4 minutes glues begin to solidify, glue completion of cure after 20 minutes, the crack is repaired and is finished.The performance that records present embodiment proportioning product is: 20 minutes set times, viscosity 20cps during application, 22 ℃ of Shao D hardness 75, ultimate compression strength 39MPa.
Comparative analysis:
In the foregoing description, if other conditions are constant, the vinyl urethane consumption changes to 50% by 10%, the vinyl monomer consumption from 10% change 60% into, the unsatured epoxy resin consumption by 10% change 60% into, the promotor quality by 0.1% change 10% into, the stopper consumption by 0.01% change 1% into, the softening agent mass ratio by 60% change 90% into, the silane coupling agent consumption by 1% change into 35%, the initiator quality changes 5% into by 1%, all can obtain the satisfied product of performance.
In the foregoing description, if other conditions are constant, replace Rocryl 410 with methyl methacrylate, butyl acrylate, perhaps be used in combination between them, all can obtain the satisfied product of performance, this is because all contain two keys in these monomers, can participate in radical polymerization and form superpolymer, thereby obtain product, other contain the vinyl monomer of two keys, can be as raw material of the present invention, and can obtain the satisfied product of performance.
The initiator that uses among the present invention is an initiator commonly used in the radical polymerization, all is similar to benzoyl peroxide, and free radical can be provided, and finishes Raolical polymerizable.
Can see by top embodiment, the present invention is by the synthesis of polyurethane performed polymer, again with Resins, epoxy, acrylate reactions, the prepared series concrete crack repair sheets that go out have low viscosity, and curing speed is fast, solidify back strength of materials height, hardness is big, and has toughness preferably, is a kind of crack patching material of good environment-friendly type.
Claims (8)
1. a self-seepage concrete crack repairing glue is divided into two kinds of prescriptions that separate of major constituent A and side ingredient B before it is characterized in that using, moiety wherein and in component separately shared mass ratio as follows:
Major constituent A: vinyl urethane 10～50%
Vinyl monomer 10～60%
Unsatured epoxy resin 10～60%
Promotor 0.1～10%
Stopper 0.01～1%
Side ingredient B: softening agent 60～90%
Silane coupling agent 1～35%
Initiator 1～5%.
2. the preparation method of the described self-seepage concrete crack repairing glue of claim 1, it is characterized in that by each moiety in component separately shared mass ratio with the stopper mixing and stirring of 10～50% vinyl urethane, 10～60% vinyl monomer, 10～60% unsatured epoxy resin, 0.1～10% promotor and 0.01～1% after the discharging packing, promptly get major constituent A; Discharging after softening agent with 10～90%, 1～10% silane coupling agent and 1～5% the initiator mixing and stirring promptly gets side ingredient B; Before using major constituent A and side ingredient B are packed respectively, major constituent A and side ingredient B are mixed during use again, major constituent A is 50: 1～10 with the fit quality ratio of side ingredient B.
3. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described vinyl monomer comprises vinylformic acid, butyl acrylate, ethyl propenoate, propyl acrylate, methyl acrylate, methyl methacrylate, methacrylic acid, carbonatoms is no more than 20 alkyl acrylate in the alkyl, alkyl methacrylate, acrylamide, Methacrylamide, vinylbenzene, alpha-alkyl phenylethylene, vinyl cyanide, methacrylonitrile, the ethene methyl esters, the ethene ethyl ester, the ethene propyl ester, the ethene butyl ester, hydroxyethyl methylacrylate, Rocryl 410 and/or senecioate-hydroxypropyl acrylate.
4. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described unsatured epoxy resin comprises undersaturated bisphenol A type epoxy resin, E type Resins, epoxy, epoxy furfural acetone resin or polybutadiene epoxy resin.
5. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described promotor comprises vulkacit H, N, accelerine N, accelerine, dimethylamine or dibenzylamine.
6. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described stopper comprises Resorcinol, meta-cresol, p-cresol or MEHQ.
7. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described softening agent comprises dimethyl phthalate, dibutyl phthalate or dioctyl phthalate (DOP).
8. self-seepage concrete crack repairing glue or its preparation method as claimed in claim 1 or 2 are characterised in that described initiator comprises benzoyl peroxide, Potassium Persulphate, ammonium persulphate, Diisopropyl azodicarboxylate, hydrogen peroxide, the hydrogen peroxide tert-butyl ester, formaldehyde, xitix, sodium sulfoxylate formaldehyde, sodium metabisulphite or ferrous ammonium sulphate.
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| CNA2008100185568A CN101230244A (en) | 2008-02-29 | 2008-02-29 | Self-seepage concrete crack repairing glue and method for making same |
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| CNA2008100185568A CN101230244A (en) | 2008-02-29 | 2008-02-29 | Self-seepage concrete crack repairing glue and method for making same |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604367A (en) * | 2012-03-06 | 2012-07-25 | 湖北省京珠高速公路管理处 | Epoxy-polyurethane blending grouting material used for road engineering maintenance |
| CN103525341A (en) * | 2013-10-10 | 2014-01-22 | 杨毅 | Acrylate bonding agent |
| CN104386964A (en) * | 2014-10-31 | 2015-03-04 | 桂林理工大学 | Preparation method of repairing adhesive for port engineering concrete tidal range and underwater part |
| CN105542667A (en) * | 2015-12-22 | 2016-05-04 | 安徽西高电气设备有限公司 | Quick-drying curing adhesive material composition used for transformer and preparation method for quick-drying curing adhesive |
| CN105753367A (en) * | 2016-01-25 | 2016-07-13 | 重庆鹏方路面工程技术研究院有限公司 | Resin concrete for quick maintenance of bridge expansion joints |
| CN104761182B (en) * | 2014-03-25 | 2017-01-11 | 广西大学 | Composite cementitious material GTP-1for rapid repairing of municipal road crack |
| CN107298959A (en) * | 2017-07-03 | 2017-10-27 | 上海都伟光伏科技有限公司 | A kind of adhesive compound and its chip cut and wafer package application |
| CN107352856A (en) * | 2017-07-25 | 2017-11-17 | 滨州学院 | A kind of airfield pavement patching material and preparation method thereof |
| CN110591017A (en) * | 2019-08-12 | 2019-12-20 | 无锡市宇盛线缆有限公司 | High-performance epoxy resin and grafting reaction method thereof |
| CN110746917A (en) * | 2019-10-18 | 2020-02-04 | 李志兴 | Preparation method of high-temperature-resistant epoxy resin adhesive |
| CN113269718A (en) * | 2021-04-15 | 2021-08-17 | 安徽大学 | Concrete prefabricated part crack detection method based on deep learning |
| CN114180929A (en) * | 2021-12-10 | 2022-03-15 | 江苏博思通新材料有限公司 | Self-repairing material for concrete superfine cracks and preparation method thereof |
| CN115368088A (en) * | 2022-09-29 | 2022-11-22 | 李娜 | Preparation method of formed concrete |
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2008
- 2008-02-29 CN CNA2008100185568A patent/CN101230244A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604367A (en) * | 2012-03-06 | 2012-07-25 | 湖北省京珠高速公路管理处 | Epoxy-polyurethane blending grouting material used for road engineering maintenance |
| CN103525341A (en) * | 2013-10-10 | 2014-01-22 | 杨毅 | Acrylate bonding agent |
| CN103525341B (en) * | 2013-10-10 | 2016-03-30 | 杨毅 | CALCIUM ACRYLATE tackiness agent |
| CN104761182B (en) * | 2014-03-25 | 2017-01-11 | 广西大学 | Composite cementitious material GTP-1for rapid repairing of municipal road crack |
| CN104386964A (en) * | 2014-10-31 | 2015-03-04 | 桂林理工大学 | Preparation method of repairing adhesive for port engineering concrete tidal range and underwater part |
| CN105542667A (en) * | 2015-12-22 | 2016-05-04 | 安徽西高电气设备有限公司 | Quick-drying curing adhesive material composition used for transformer and preparation method for quick-drying curing adhesive |
| CN105753367B (en) * | 2016-01-25 | 2018-09-14 | 重庆鹏方路面工程技术研究院有限公司 | A kind of resin concrete and preparation method thereof for bridge expanssion joint rapid-maintenance |
| CN105753367A (en) * | 2016-01-25 | 2016-07-13 | 重庆鹏方路面工程技术研究院有限公司 | Resin concrete for quick maintenance of bridge expansion joints |
| CN107298959A (en) * | 2017-07-03 | 2017-10-27 | 上海都伟光伏科技有限公司 | A kind of adhesive compound and its chip cut and wafer package application |
| CN107352856A (en) * | 2017-07-25 | 2017-11-17 | 滨州学院 | A kind of airfield pavement patching material and preparation method thereof |
| CN110591017A (en) * | 2019-08-12 | 2019-12-20 | 无锡市宇盛线缆有限公司 | High-performance epoxy resin and grafting reaction method thereof |
| CN110746917A (en) * | 2019-10-18 | 2020-02-04 | 李志兴 | Preparation method of high-temperature-resistant epoxy resin adhesive |
| CN113269718A (en) * | 2021-04-15 | 2021-08-17 | 安徽大学 | Concrete prefabricated part crack detection method based on deep learning |
| CN113269718B (en) * | 2021-04-15 | 2022-09-16 | 安徽大学 | Concrete prefabricated part crack detection method based on deep learning |
| CN114180929A (en) * | 2021-12-10 | 2022-03-15 | 江苏博思通新材料有限公司 | Self-repairing material for concrete superfine cracks and preparation method thereof |
| CN115368088A (en) * | 2022-09-29 | 2022-11-22 | 李娜 | Preparation method of formed concrete |
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