CN112710519B - Environment-responsive polymer self-repairing mortar and preparation method thereof - Google Patents

Environment-responsive polymer self-repairing mortar and preparation method thereof Download PDF

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CN112710519B
CN112710519B CN202011301842.2A CN202011301842A CN112710519B CN 112710519 B CN112710519 B CN 112710519B CN 202011301842 A CN202011301842 A CN 202011301842A CN 112710519 B CN112710519 B CN 112710519B
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刘俊亮
季茸
孙楠楠
张士萍
牛龙龙
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Abstract

The invention discloses an environment-responsive polymer self-repairing mortar and a preparation method thereof. The self-repairing mortar prepared has obvious inhibiting effect and crack repairing effect on mortar cracks.

Description

Environment-responsive polymer self-repairing mortar and preparation method thereof
Technical Field
The invention relates to an environmental response high-molecular self-repairing mortar and a preparation method thereof, belonging to the technical field of building materials.
Background
The formation of cracks and the expansion of the cracks of the concrete structural material in the service use process will cause the hidden troubles of the mechanical property attenuation and the safety of the structural material. From the engineering point of view, the real-time monitoring and timely repairing of the crack are difficult to realize. At present, the concrete crack active repairing technology is generally based on the conditions that the environment of a concrete structure mainly comprises water, gas, acid and alkali, positive and negative ion environments and the like, and stimulates a concrete matrix with cracks to generate a healing product so as to repair the cracks. The environment response water absorption polymer is just different from the environment when the concrete cracks are generated and the environment when the cracks are not generated, so that the water absorption polymer can be considered as a self-repairing agent to repair the concrete cracks. However, the strength of the concrete before and after forming is reduced due to the addition of the repairing agent, and the problem that the interface connection effect between a polymer and a concrete matrix is weak exists, most of the current researches focus on the enhancement of crack repairing capability, but the researches on the strength between the polymer matrix and the concrete matrix are not deep enough, so that the concrete self-repairing agent can meet the actual use requirements by being subjected to ionization modification on the basis of the traditional water-absorbing polymer structure so as to serve as the concrete self-repairing agent in service performance and repairing performance.
Disclosure of Invention
The invention aims to provide the environmental response self-repairing mortar and the preparation method thereof, so that the concrete can automatically respond to the generation and repair of cracks in the application service process, the generation of the cracks can be inhibited in the early stage, the performance of the concrete is enhanced, and the cracks can be automatically sensed and repaired when the cracks appear in the later stage.
The technical scheme for realizing the purpose of the invention is as follows: an environment-responsive self-repairing mortar comprises, by weight, 100 parts of a cementing material, 300-315 parts of a fine aggregate, 0.01-0.15 part of a repairing agent and 50-52.5 parts of water.
Preferably, the cementing material is ordinary portland cement, preferably portland cement with a strength grade of 32.5 or more.
Preferably, the fine aggregate is standard sand, the particle size distribution of the standard sand is 0.08 mm-0.5 mm, 0.5 mm-1.0 mm and 1.0 mm-2.0 mm, and each grade accounts for one third of the total amount.
Preferably, the repairing agent is a rare earth bonding environment response water absorption polymer with the rare earth content of 1-10 mol%, and is obtained in a solution polymerization mode, and the structural formula is as follows:
Figure DEST_PATH_IMAGE001
wherein, the water-absorbing polymer network structure refers to an acrylic acid-acrylamide copolymerization water-absorbing polymer resin structure.
Specifically, the rare earth bonding environment response water absorption polymer is prepared by taking cerium carbonate as a cerium source, directly reacting with Acrylic Acid (AA), taking the obtained reaction product of cerium acrylate as one of monomers, and reacting with acrylic acid and an acrylamide monomer by a solution polymerization method to obtain the rare earth bonding environment response water absorption polymer, and specifically comprising the following steps:
1) Preparation of rare earth bonded acrylic acid solution: dispersing cerium carbonate in deionized water to form a cerium carbonate suspension; adding acrylic acid dropwise into the cerium carbonate suspension; the whole system is gradually heated to 55 DEGoC, reacting for 2 hours, filtering while the solution is hot to obtain a rare earth bonded acrylic acid solution, and recording the solution as a solution 1;
2) preparing a rare earth bonding environment response water-absorbing polymer: simultaneously dissolving acrylamide and N, N' -methylene bisacrylamide in deionized water to obtain a solution 2; dissolving acrylic acid in deionized water to obtain a solution 3; mixing the solution 2 and the solution 3, introducing nitrogen for 20 minutes, heating in a water bath to 60 ℃, and marking the obtained mixed solution as a solution 4; dissolving potassium persulfate and N, N, N ', N' -tetramethylethylenediamine in deionized water to obtain a solution 5; and (3) dropwise adding the solution 1 and the solution 5 into the solution 4 at the same time, reacting for 4 hours to obtain a gel product, drying, and crushing to obtain the rare earth bonding environmental response water absorption polymer.
The invention also provides a preparation method of the environment-responsive self-repairing mortar, which is prepared by mixing, stirring and molding a cementing material, a fine aggregate, a repairing agent and water.
The invention also provides application of the environment-responsive self-repairing mortar in building construction and roads. The environment-responsive self-repairing mortar can be used as a material which is used in building construction and roads and can inhibit the generation of cracks and repair the generated cracks.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for preparing environment response self-repairing mortar integrating crack inhibition and crack repair. The method has the characteristics of simple operation, strong applicability and the like, and the prepared environment response self-repairing mortar has the characteristic of environment response and can ensure that the effect of promoting the healing of concrete cracks is improved.
Drawings
FIG. 1 shows the synthesis of rare earth bonded environment responsive water absorbing polymer products (examples 1 and 2), environment responsive water absorbing polymer (comparative example 2), intermediate product (Ce (AA))3) And acrylic acid monomer structure (AA) validation infrared images.
FIG. 2 is a diagram showing the crack repairing effect of the environmentally-friendly self-repairing mortar obtained in the examples and comparative examples.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
The existence of carboxylic acid groups in the water-absorbing polymer structure is a favorable condition for ionic bonding, and the existence of metal ions in concrete formation can promote the hydration process of concrete, and simultaneously, more hydration products are generated around the ions to form a concrete matrix with higher strength. In the crack repairing process, the metal ions are used as a bridge between the concrete matrix and the water-absorbing polymer, on one hand, the metal ions are tightly combined with the water-absorbing polymer, on the other hand, hydration products are enriched, and the close connection between the concrete matrix and the water-absorbing polymer repairing agent is realized. The rare earth ions are bonded in the water-absorbing polymer, so that the advantages are achieved, and the unique light-emitting characteristic of the rare earth ions provides possibility for detecting deep cracks of concrete later.
The added rare earth bonding environment response water absorption polymer is cerium bonding acrylic acid-acrylamide copolymerization water absorption polymer resin, wherein the molar content of rare earth cerium relative to an acrylic acid unit is 1-15 mol%, the environment response water absorption polymer is pH response water absorption polymer, and the rare earth bonding environment response water absorption polymer takes cerium carbonate as a cerium source and directly reacts with acrylic acid to synthesize the cerium acrylate. The method is characterized in that cerium acrylate is taken as one of monomers, participates in the synthesis of the environment response water absorption macromolecules with acrylic acid and acrylamide monomers through a solution polymerization method, so as to obtain the rare earth bonding environment response water absorption macromolecules, wherein rare earth elements are connected with the environment response water absorption macromolecules in a bonding mode, so that the cement in a concrete matrix can be enhanced in a hydration process, the interaction between the cement matrix and the rare earth bonding environment response water absorption macromolecule repairing agent is formed, and the strength increase of the cement matrix and the crack repairing efficiency are improved.
The environmental response self-repairing mortar is adopted to prepare samples respectively, strength test samples and crack repairing samples need to be prepared respectively due to different test requirements, and the respective compressive strength change and repairing effect are tested.
The strength test sample and the crack repairing sample are the same raw material and composition, but the crack repairing sample needs to be prefabricated firstly, so that the operation of adding iron wires is performed twice in the forming process.
Example 1
Synthesis of 1% rare earth bonded environment response water absorption polymer
1) Preparation of rare earth bonded acrylic acid solution: dispersing 4.602 g of cerium carbonate in 20 ml of deionized water to form a cerium carbonate suspension; the amount of Acrylic Acid (AA) was 4.322 g, and acrylic acid was added dropwise to the cerium carbonate suspension using a peristaltic pump; the whole system is gradually heated to 55 DEGoC, reacting for 2 hours, filtering while the solution is hot to obtain rare earth bonded acrylic acid (Ce (AA)3) The solution, denoted as solution 1.
2) Preparing a rare earth bonding environment response water-absorbing polymer: 15.985 g of acrylamide and 0.577 g of N, N' -methylene bisacrylamide are dissolved in 40 ml of deionized water simultaneously to obtain a solution 2. 9.780 g of acrylic acid was dissolved in 40 ml of deionized water to give solution 3. And mixing the solution 2 and the solution 3, adding the mixture into a four-neck flask, introducing nitrogen for 20 minutes, heating the mixture in a water bath to 60 ℃, and marking the obtained mixed solution as a solution 4. Potassium persulfate, 0.545 g, and 0.224 g of N, N' -tetramethylethylenediamine were dissolved in 15 ml of deionized water to obtain solution 5. 1.5 ml of the solution 1 and the solution 5 are simultaneously dripped into the solution 4 to react for 4 hours to obtain a gelatinous product. Drying and crushing to obtain the rare earth bonding environment response water absorption polymer, which is marked as P-C.
Strength test sample preparation
1) Preparing mortar: weighing 450 g of Portland cement (sold in the market) with the strength grade of more than 32.5, 225 g of water and 0.45 g of 1% rare earth bonding environment response water absorption polymer (namely P-C), mixing in a cement mortar mixer, and starting the program: the mixture is stirred slowly for 30 seconds, 1350 grams of standard sand is automatically fed for 30 seconds and then quickly stirred for 30 seconds, and the stirring is stopped for 90 seconds and then quickly stirred for 60 seconds.
2) Molding: and pouring the stirred mortar into a forming die, placing the forming die on a cement mortar vibrating table, vibrating for 60 seconds, and leveling the redundant mortar. After the label is written, the label is covered by a plastic film, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly soaked.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (4) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm less than that of the mortar sample.
Crack repairing sample preparation
1) Preparing mortar: weighing 450 g of Portland cement (sold in the market) with the strength grade of more than 32.5, 225 g of water and 0.45 g of 1% rare earth bonding environment response water absorption polymer (namely P-C), mixing the weighed cement, water and the rare earth bonding environment response water absorption polymer (namely P-C), putting the mixture into a cement mortar mixer for mixing, and starting a program: slowly stirring for 30 seconds, quickly stirring for 30 seconds after sand is fed for 30 seconds, stopping stirring for 90 seconds, and quickly stirring for 60 seconds.
2) Molding: pouring the stirred mortar into a forming die, pouring 1/3 mass of the total sample for the first time, placing on a cement mortar vibrating table, vibrating for 60 seconds, adding two iron wires, adding 1/3 mass of the sample, vibrating for 60 seconds, adding one iron wire, continuously adding the rest of the slurry, vibrating for 60 seconds, and leveling the rest of the slurry. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (3) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm higher than that of the mortar sample.
5) Prefabricating a crack: and after the sample is maintained for 7 days, performing crack prefabrication by using a mechanical test, wherein the prefabricated cracks are all between 0.20 and 0.35 mm.
6) And (5) maintenance: and (4) placing the mortar test piece with the prefabricated crack into the prepared artificial seawater solution for maintenance, and observing the crack repairing effect after respectively maintaining for 14 days and 28 days. Is marked as M-P-C.
Example 2
Synthesis of 5% rare earth bonded environment response water-absorbing polymer
1) Preparation of rare earth bonded acrylic acid solution: dispersing 4.602 g of cerium carbonate in 20 ml of deionized water to form a cerium carbonate suspension; the amount of acrylic acid was 4.322 g, and acrylic acid was added to the cerium carbonate suspension in a dropwise addition manner using a peristaltic pump; the whole system is gradually heated to 55 DEG oAnd C, reacting for 2 hours, and filtering while the solution is hot to obtain a rare earth bonded acrylic acid solution which is recorded as a solution 1.
2) Preparing a rare earth bonding environment response water absorption polymer: 15.985 g of acrylamide and 0.577 g of N, N' -methylene bisacrylamide are simultaneously dissolved in 40 ml of deionized water to obtain a solution 2. 9.780 g of acrylic acid was dissolved in 40 ml of deionized water to give solution 3. And mixing the solution 2 and the solution 3, adding the mixture into a four-neck flask, introducing nitrogen for 20 minutes, heating the mixture in a water bath to 60 ℃, and marking the obtained mixed solution as a solution 4. Potassium persulfate 0.545 g and N, N' -tetramethylethylenediamine 0.224 g were dissolved in 15 ml of deionized water to obtain solution 5. 7.5 ml of the solution 1 and the solution 5 are simultaneously dripped into the solution 4 to react for 4 hours to obtain a gelatinous product. Drying and crushing to obtain the rare earth bonding environment response water absorption polymer, which is marked as P-5C.
Strength test sample preparation
1) Preparing mortar: weighing 450 g of Portland cement with the strength grade of more than 32.5, 225 g of water and 0.45 g of 5% rare earth bonding environment response water absorption polymer (namely P-5C), mixing the mixture in a cement mortar mixer, and starting the program: the mixture is stirred slowly for 30 seconds, 1350 grams of standard sand is automatically fed for 30 seconds and then quickly stirred for 30 seconds, and the stirring is stopped for 90 seconds and then quickly stirred for 60 seconds.
2) Molding: and pouring the stirred mortar into a forming die, placing the forming die on a cement mortar vibrating table, vibrating for 60 seconds, and leveling the redundant mortar. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (4) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm less than that of the mortar sample.
Crack repair sample preparation
1) Preparing mortar: weighing 450 g of Portland cement with the strength grade of more than 32.5, 225 g of water and 0.45 g of 5% rare earth bonding environment response water absorption polymer (namely P-5C), mixing the weighed cement, water and the rare earth bonding environment response water absorption polymer (namely P-5C), putting the mixture into a cement mortar stirrer for mixing, and starting a program: firstly stirring slowly for 30 seconds, adding sand for 30 seconds, then quickly stirring for 30 seconds, stopping stirring for 90 seconds, and then quickly stirring for 60 seconds.
2) Molding: pouring the stirred mortar into a forming die, pouring 1/3 mass of the total sample for the first time, placing on a cement mortar vibrating table, vibrating for 60 seconds, adding two iron wires, adding 1/3 mass of the sample, vibrating for 60 seconds, adding one iron wire, continuously adding the rest of the slurry, vibrating for 60 seconds, and leveling the rest of the slurry. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (4) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm less than that of the mortar sample.
5) Prefabricating a crack: and after the sample is maintained for 7 days, performing crack prefabrication by using a mechanical test, wherein the prefabricated cracks are all between 0.20 and 0.35 mm.
6) And (5) maintenance: and (4) placing the mortar test piece with the prefabricated crack into the prepared artificial seawater solution for maintenance, and observing the crack repairing effect after respectively maintaining for 14 days and 28 days. Is marked as M-P-5C.
Comparative example 1
Strength test sample preparation
1) Preparing mortar: weighing 450 g of Portland cement with the strength grade of more than 32.5 and 225 g of water, mixing, putting into a cement mortar mixer, mixing, and starting a program: the mixture is slowly stirred for 30 seconds, 1350 grams of standard sand is automatically put into the sand for 30 seconds and then quickly stirred for 30 seconds, and the stirring is stopped for 90 seconds and then quickly stirred for 60 seconds.
2) Molding: and pouring the stirred mortar into a forming die, placing the forming die on a cement mortar vibrating table, vibrating for 60 seconds, and leveling the redundant mortar. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (3) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm higher than that of the mortar sample.
Crack repairing sample preparation
1) Preparing mortar: weighing 450 g of Portland cement with the strength grade of more than 32.5 and 225 g of water, mixing the weighed cement and water, putting the mixture into a cement mortar mixer for mixing, and starting a program: firstly stirring slowly for 30 seconds, adding sand for 30 seconds, then quickly stirring for 30 seconds, stopping stirring for 90 seconds, and then quickly stirring for 60 seconds.
2) Molding: pouring the stirred mortar into a forming die, pouring 1/3 mass of the total sample for the first time, placing on a cement mortar vibrating table, vibrating for 60 seconds, adding two iron wires, adding 1/3 mass of the sample, vibrating for 60 seconds, adding one iron wire, continuously adding the rest of the slurry, vibrating for 60 seconds, and leveling the rest of the slurry. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (3) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm higher than that of the mortar sample.
5) Prefabricating a crack: and after the sample is maintained for 7 days, performing crack prefabrication by using a mechanical test, wherein the prefabricated cracks are all between 0.20 and 0.35 mm.
6) And (5) maintenance: and (4) placing the mortar test piece with the prefabricated crack into the prepared artificial seawater solution for maintenance, and observing the crack repairing effect after respectively maintaining for 14 days and 28 days. Denoted as M.
Comparative example 2
Preparation of environment-responsive water-absorbing polymer
15.985 g of acrylamide and 0.577 g of N, N' -methylene bisacrylamide are dissolved in 40 ml of deionized water simultaneously to obtain a solution 1. 10.804 g of acrylic acid was dissolved in 40 ml of deionized water to give solution 2. And mixing the solution 1 and the solution 2, adding the mixture into a four-neck flask, introducing nitrogen for 20 minutes, heating the mixture in a water bath to 60 ℃, and marking the obtained mixed solution as a solution 3. Potassium persulfate, 0.545 g, and 0.224 g of N, N' -tetramethylethylenediamine were dissolved in 15 ml of deionized water to give solution 4. And dropwise adding the solution 3 into the solution 4, and reacting for 4 hours to obtain a gel product. Drying and crushing to obtain the environment response water absorption polymer which is marked as P.
Strength test sample preparation
1) Preparing mortar: weighing 450 g of Portland cement with the strength grade of more than 32.5, 225 g of water and 0.45 g of environment response water absorption polymer (namely P), mixing the mixture in a cement mortar mixer, and starting the program: the mixture is stirred slowly for 30 seconds, 1350 grams of standard sand is automatically fed for 30 seconds and then quickly stirred for 30 seconds, and the stirring is stopped for 90 seconds and then quickly stirred for 60 seconds.
2) Molding: and pouring the stirred mortar into a forming die, placing the forming die on a cement mortar vibrating table, vibrating for 60 seconds, and trowelling the redundant mortar. After the label is written, the label is covered by a plastic film, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly soaked.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (4) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm less than that of the mortar sample.
Crack repair sample preparation
1) Preparing mortar: weighing 450 g of portland cement with the strength grade of more than 32.5, 225 g of water and 0.45 g of environment response water absorption polymer (namely P), mixing the weighed cement, water and water absorption resin, putting the mixture into a cement mortar mixer for mixing, and starting a program: firstly stirring slowly for 30 seconds, adding sand for 30 seconds, then quickly stirring for 30 seconds, stopping stirring for 90 seconds, and then quickly stirring for 60 seconds.
2) Molding: and pouring the stirred mortar into a forming die, pouring 1/3 of the total sample for the first time, placing on a cement mortar vibrating table, vibrating for 60 seconds, adding two iron wires, adding 1/3 of the sample, vibrating for 60 seconds, adding one iron wire, continuously adding the rest of the slurry, vibrating for 60 seconds, and trowelling the rest of the slurry. After the label is written, a plastic film is used for covering, and after 20 hours, a small amount of water is sprayed on the surface of the solidified mortar, so that the surface of the mortar is slightly wetted.
3) Demolding: after 24 hours the cured mortar was removed from the mould.
4) Hydration and water conservation: and (4) placing the removed mortar sample in water for water protection, wherein the amount of the water is 2 cm less than that of the mortar sample.
5) Prefabricating a crack: and after the sample is maintained for 7 days, performing crack prefabrication by using a mechanical test, wherein the prefabricated cracks are all between 0.20 and 0.35 mm.
6) And (5) maintenance: and (4) placing the mortar test piece with the prefabricated crack into the prepared artificial seawater solution for maintenance, and observing the crack repairing effect after respectively maintaining for 14 days and 28 days. Is marked as M-P.
The synthesized environment-responsive water-absorbent resin was subjected to structural verification (see fig. 1), indicating that the synthesized environment-responsive water-absorbent resin had the characteristic structure of a polymer, and cerium ions had been successfully bonded into the structure of the water-absorbent resin. The experimental examples and the comparative examples are carried out simultaneously, and the compressive strength change of the obtained mortar samples is tested after curing for 1 day, 14 days and 28 days (as shown in table 1), which shows that the compressive strength of the obtained rare earth composite environment response type self-repairing mortar shows higher compressive strength than that of the mortar samples in each curing stage, and proves that the mortar samples can inhibit the generation of cracks and enhance the mortar strength.
Figure DEST_PATH_IMAGE003
The experiments of the examples and comparative examples were performed simultaneously. After the mortar test piece with the prefabricated crack is maintained, the test result shows that the mortar test piece added with the rare earth bonding environment response water-absorbing polymer can continuously maintain the repairing effect for a long time (as shown in figure 2), which shows that the rare earth bonding environment response self-repairing mortar can effectively repair the crack in the mortar and maintain the long-time repairing effect.

Claims (9)

1. An environment-responsive self-repairing mortar is characterized by comprising 100 parts of a cementing material, 300-315 parts of fine aggregate, 0.01-0.15 part of a repairing agent and 50-52.5 parts of water in parts by weight;
wherein, the repairing agent is a rare earth bonding environment response water absorption macromolecule, and the structural formula is as follows:
Figure FDA0003583201230000011
Figure FDA0003583201230000012
water-absorbing polymer network structure
Wherein, the water-absorbing polymer network structure refers to an acrylic acid-acrylamide copolymerized water-absorbing polymer resin structure.
2. The environment-responsive self-repairing mortar of claim 1, wherein the repairing agent is prepared by reacting cerium carbonate serving as a cerium source with acrylic acid, and polymerizing the reaction product with acrylic acid and acrylamide monomers in a solution manner.
3. The environment-responsive self-repairing mortar of claim 1 or 2, wherein the repairing agent is prepared by the following steps:
1) preparation of rare earth bonded acrylic acid solution: dispersing cerium carbonate in deionized water to form a cerium carbonate suspension; adding acrylic acid dropwise into the cerium carbonate suspension; the whole system is gradually heated to 55 ℃ and then reacts for 2 hours, and the solution is filtered while the system is hot to obtain rare earth bonded acrylic acid solution which is marked as solution 1;
2) preparing a rare earth bonding environment response water-absorbing polymer: simultaneously dissolving acrylamide and N, N' -methylene bisacrylamide in deionized water to obtain a solution 2; dissolving acrylic acid in deionized water to obtain a solution 3; mixing the solution 2 and the solution 3, introducing nitrogen for 20 minutes, heating in a water bath to 60 ℃, and marking the obtained mixed solution as a solution 4; dissolving potassium persulfate and N, N, N ', N' -tetramethylethylenediamine in deionized water to obtain a solution 5; and (3) dropwise adding the solution 1 and the solution 5 into the solution 4 at the same time, reacting for 4 hours to obtain a gel product, drying and crushing to obtain the product.
4. The environment-responsive self-repairing mortar of claim 3, wherein the molar content of the rare earth cerium relative to the acrylic acid unit is 1 mol% to 15 mol%.
5. The environmentally responsive self-healing mortar of claim 1, wherein the cementitious material is portland cement.
6. The environmentally responsive self-healing mortar of claim 1, wherein the cementitious material is portland cement having a strength grade of 32.5 or greater.
7. The environment-responsive self-repairing mortar of claim 1, wherein the fine aggregate is standard sand, the particle size distribution of the standard sand is 0.08-0.5 mm, 0.5-1.0 mm and 1.0-2.0 mm, and each grade accounts for one third of the total amount.
8. The preparation method of the environment-responsive self-repairing mortar of claim 1, wherein the mortar is prepared by mixing, stirring and molding a cementing material, a fine aggregate, a repairing agent and water.
9. The use of the environmentally responsive self-healing mortar of claim 1 in building construction and roadways.
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CN113880526B (en) * 2021-11-02 2022-11-15 中国科学院过程工程研究所 Building material with waterproof self-repairing function and preparation method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565875A (en) * 1969-03-10 1971-02-23 Goodrich Gulf Chem Inc Polymerization process and catalyst system therefor
CN101157744A (en) * 2007-09-11 2008-04-09 浙江大学 Method for grafting polymer on metal material surface
CN101307119A (en) * 2008-06-24 2008-11-19 南京大学 Method for preparing amphiprotic chitosan flocculant
CN102757196A (en) * 2012-07-25 2012-10-31 天津市南开区房地产管理局 Waterproof cement additive and cement containing same
CN102976697A (en) * 2012-12-24 2013-03-20 武汉理工大学 High-ductility low-shrinkage anti-cracking concrete for bridge deck pavement and preparation method thereof
CN106082893A (en) * 2016-06-29 2016-11-09 浙江工业大学 Seepage selfreparing waterproof mortar and preparation method thereof
CN107721335A (en) * 2017-11-20 2018-02-23 广西融辰建设工程有限公司 A kind of anticracking grout and preparation method thereof
CN110482927A (en) * 2019-07-30 2019-11-22 西安建筑科技大学 A kind of recycled fine aggregate is the selfreparing facing mortar and preparation method of carrier
CN110734243A (en) * 2019-11-01 2020-01-31 北京工业大学 SAPs microcapsule and cement-based self-repairing material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565875A (en) * 1969-03-10 1971-02-23 Goodrich Gulf Chem Inc Polymerization process and catalyst system therefor
CN101157744A (en) * 2007-09-11 2008-04-09 浙江大学 Method for grafting polymer on metal material surface
CN101307119A (en) * 2008-06-24 2008-11-19 南京大学 Method for preparing amphiprotic chitosan flocculant
CN102757196A (en) * 2012-07-25 2012-10-31 天津市南开区房地产管理局 Waterproof cement additive and cement containing same
CN102976697A (en) * 2012-12-24 2013-03-20 武汉理工大学 High-ductility low-shrinkage anti-cracking concrete for bridge deck pavement and preparation method thereof
CN106082893A (en) * 2016-06-29 2016-11-09 浙江工业大学 Seepage selfreparing waterproof mortar and preparation method thereof
CN107721335A (en) * 2017-11-20 2018-02-23 广西融辰建设工程有限公司 A kind of anticracking grout and preparation method thereof
CN110482927A (en) * 2019-07-30 2019-11-22 西安建筑科技大学 A kind of recycled fine aggregate is the selfreparing facing mortar and preparation method of carrier
CN110734243A (en) * 2019-11-01 2020-01-31 北京工业大学 SAPs microcapsule and cement-based self-repairing material

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
SAP 的吸水性能及其对混凝土强度的影响;秦子凡 等;《南 京 工 程 学 院 学 报 ( 自 然 科 学 版 )》;20210930;第19-23页 *
不同pH值环境下砂浆裂缝的自愈合行为;石宝存等;《混凝土》;20200427(第04期);第117-124页（参见"1.1试验原材料"、"表2砂浆试块的材料成分"） *
丙烯酸盐和丙烯酰胺共聚物的制备;李爱秀;《太原理工大学学报》;20030731;第449-451页 *
高吸水性表面环境修复剂的制备条件研究;陈霞 等;《兰 州 交 通 大 学 学 报 ( 自 然 科 学 版 )》;20060831;第153-156页 *

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