CN112710519A - Environment-responsive polymer self-repairing mortar and preparation method thereof - Google Patents
Environment-responsive polymer self-repairing mortar and preparation method thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 98
- 229920000642 polymer Polymers 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 109
- 239000000243 solution Substances 0.000 claims description 67
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 41
- 230000004044 response Effects 0.000 claims description 40
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 33
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 19
- 229910021641 deionized water Inorganic materials 0.000 claims description 19
- 150000002910 rare earth metals Chemical group 0.000 claims description 16
- GHLITDDQOMIBFS-UHFFFAOYSA-H cerium(3+);tricarbonate Chemical compound [Ce+3].[Ce+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O GHLITDDQOMIBFS-UHFFFAOYSA-H 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000011398 Portland cement Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- 229910052684 Cerium Inorganic materials 0.000 claims description 7
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 5
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- RNIHAPSVIGPAFF-UHFFFAOYSA-N Acrylamide-acrylic acid resin Chemical compound NC(=O)C=C.OC(=O)C=C RNIHAPSVIGPAFF-UHFFFAOYSA-N 0.000 claims description 3
- 238000009435 building construction Methods 0.000 claims description 3
- 238000007334 copolymerization reaction Methods 0.000 claims description 3
- 239000002952 polymeric resin Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000000379 polymerizing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 26
- 239000004567 concrete Substances 0.000 description 21
- 238000012360 testing method Methods 0.000 description 18
- 239000000203 mixture Substances 0.000 description 17
- 239000011083 cement mortar Substances 0.000 description 16
- 230000036571 hydration Effects 0.000 description 12
- 238000006703 hydration reaction Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 10
- 230000008439 repair process Effects 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 8
- 239000002985 plastic film Substances 0.000 description 8
- 229920006255 plastic film Polymers 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 239000004568 cement Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical compound [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 4
- 229920002521 macromolecule Polymers 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 3
- ZLHYQQUHFATESX-UHFFFAOYSA-K cerium(3+);prop-2-enoate Chemical compound [Ce+3].[O-]C(=O)C=C.[O-]C(=O)C=C.[O-]C(=O)C=C ZLHYQQUHFATESX-UHFFFAOYSA-K 0.000 description 3
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- -1 rare earth ions Chemical class 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000035876 healing Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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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
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:
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 environment response water-absorbing 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 characteristics of environment response and can ensure that the effect of promoting the healing of the 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 are required 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-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 (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, 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 (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: 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-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 used was 4.322 g, and acrylic acid was added to the cerium carbonate suspension in a dropwise manner using a peristaltic pump; the whole system is gradually heated to 55 DEGoAnd C, reacting for 2 hours, and filtering while the solution is hot to obtain a rare earth bonded acrylic acid solution which is marked 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. 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 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 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 (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. 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 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 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.
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. The environmental response type self-repairing mortar is characterized by comprising 100 parts of cementing material, 300-315 parts of fine aggregate, 0.01-0.15 part of repairing agent and 50-52.5 parts of water in parts by weight.
2. The environment-responsive self-repairing mortar of claim 1, wherein the repairing agent is a rare earth bonded environment-responsive water-absorbing polymer, and the structural formula of the repairing agent is as follows:
wherein, the water-absorbing polymer network structure refers to an acrylic acid-acrylamide copolymerization water-absorbing polymer resin structure.
3. The environment-responsive self-repairing mortar of claim 1 or 2, wherein the repairing agent is prepared by reacting cerium carbonate serving as a cerium source with acrylic acid, and polymerizing the obtained reaction product with acrylic acid and acrylamide monomers in a solution manner.
4. 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 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 product.
5. 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 1mol% to 15 mol%.
6. The environmentally responsive self-healing mortar of claim 1, wherein the cementitious material is portland cement, preferably 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 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.
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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