CN115974444B - Cement crack activation crosslinking repair system and preparation method and application thereof - Google Patents
Cement crack activation crosslinking repair system and preparation method and application thereof Download PDFInfo
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- 230000008439 repair process Effects 0.000 title claims abstract description 119
- 239000004568 cement Substances 0.000 title claims abstract description 118
- 238000004132 cross linking Methods 0.000 title claims abstract description 50
- 230000004913 activation Effects 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 14
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003999 initiator Substances 0.000 claims abstract description 42
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 claims abstract description 21
- 239000012190 activator Substances 0.000 claims abstract description 17
- 150000007942 carboxylates Chemical class 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 66
- 230000003213 activating effect Effects 0.000 claims description 49
- 239000003795 chemical substances by application Substances 0.000 claims description 47
- 238000003756 stirring Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- 229940047670 sodium acrylate Drugs 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 4
- MSJMDZAOKORVFC-UAIGNFCESA-L disodium maleate Chemical compound [Na+].[Na+].[O-]C(=O)\C=C/C([O-])=O MSJMDZAOKORVFC-UAIGNFCESA-L 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 claims description 3
- UMTVCEDYAZNYBU-UHFFFAOYSA-N 2-methylidenebutanedioic acid;sodium Chemical compound [Na].OC(=O)CC(=C)C(O)=O UMTVCEDYAZNYBU-UHFFFAOYSA-N 0.000 claims description 2
- 239000004111 Potassium silicate Substances 0.000 claims description 2
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 2
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 14
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 7
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- 238000004090 dissolution Methods 0.000 abstract description 4
- 230000009257 reactivity Effects 0.000 abstract description 4
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- 239000011159 matrix material Substances 0.000 description 7
- 238000002791 soaking Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
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- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- -1 sodium carboxylate Chemical class 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 1
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- IZZSMHVWMGGQGU-UHFFFAOYSA-L disodium;2-methylidenebutanedioate Chemical compound [Na+].[Na+].[O-]C(=O)CC(=C)C([O-])=O IZZSMHVWMGGQGU-UHFFFAOYSA-L 0.000 description 1
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- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
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- 239000012966 redox initiator Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
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- 239000008399 tap water Substances 0.000 description 1
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- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a cement crack activation crosslinking repair system, a preparation method and application thereof, wherein the cement crack activation crosslinking repair system comprises a first repair system and a second repair system; the first repair system includes a silicate solution and a reducing initiator; the second repair system includes an activator solution, an oxidative initiator, and a crosslinking agent; the activator in the activator solution is carboxylate containing double bond. When the cement crack activation crosslinking repair system is applied, the first repair system and the second repair system are uniformly mixed at room temperature and then directly undergo polymerization reaction in the crack, the activation system accelerates the dissolution and deposition of calcium ions in cement, the reactivity of cement at the crack is improved, and the polymerization crosslinking system can provide a template for the deposition of calcium ions.
Description
Technical Field
The invention belongs to the technical field of cement restoration, and particularly relates to a cement crack activation crosslinking restoration system, a preparation method and application thereof.
Background
The cement-based material is a porous brittle material, and in the service process, the crack is inevitably caused by the external temperature, humidity change, external load and other factors, the existence of micro cracks can accelerate the damage of a cement structure, and the safety and the durability of related facilities are seriously affected, so that the cement crack is very necessary to be repaired effectively in time. Most of the existing repairing agents are internal doping type repairing agents, and the repairing agents have little significance for repairing cracked cement structures. While common repairing methods for cracked cement materials include chemical grouting, coating materials and the like, the repairing period of the methods is long, the repairing efficiency is low, and only surface macrocracks can be treated, so that internal microcracks are difficult to repair. Therefore, developing a new crack healing system is of great importance for improving the durability of cement structures and ensuring safe production.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a cement crack activation crosslinking repair system which overcomes the defects of long repair period, low repair efficiency and poor repair effect of the conventional cement repair system.
Another object of the invention is to provide the use of a cement crack activation cross-linking repair system in cement crack repair.
It is another object of the present invention to provide a method for preparing a first repair system.
It is another object of the present invention to provide a method for preparing a second repair system.
The aim of the invention is achieved by the following technical scheme.
A cement crack activation crosslinking repair system, comprising a first repair system and a second repair system;
the first repair system includes a silicate solution and a reducing initiator;
the second repair system includes an activator solution, an oxidative initiator, and a crosslinking agent;
the activator in the activator solution is carboxylate containing double bond.
In the above technical scheme, the carboxylate containing double bond is sodium acrylate, sodium itaconate or sodium maleate.
In the above technical solution, the silicate solution is a mixed solution of silicate and water.
In the above technical scheme, the activator solution is a mixed solution of activator and water.
In the above technical scheme, the silicate is sodium silicate or potassium silicate.
In the technical scheme, the reductive initiator is sodium sulfite or sodium thiosulfate.
In the technical scheme, the oxidative initiator is ammonium persulfate or potassium persulfate.
In the technical scheme, the cross-linking agent is N, N-methylene bisacrylamide.
The application of the cement crack activation crosslinking repair system in cement crack repair is that the first repair system and the second repair system in the cement crack activation crosslinking repair system are uniformly mixed at room temperature and then soaked or filled in the cement crack to be repaired.
A method of preparing the first repair system comprising the steps of: adding silicate into water, mixing uniformly to obtain silicate solution, and adding a reducing initiator into the silicate solution at room temperature while stirring uniformly to obtain a first repair system, wherein the mass fraction of silicate in the silicate solution is 10-20%, and the mass fraction of the reducing initiator is 1-3% of that of the silicate solution.
In the technical scheme, the stirring speed is 300-500 rpm, and the stirring time is 5-10 min.
A method of preparing the second repair system comprising the steps of:
adding an activating agent into water, uniformly mixing to obtain an activating agent solution, and adding an oxidizing initiator and a cross-linking agent into the activating agent solution at room temperature while stirring until the activating agent solution is uniform to obtain a second repairing system, wherein the activating agent in the activating agent solution has the mass fraction of 10-20%, the oxidizing initiator accounts for 1.5-2.0% of the activating agent solution, and the cross-linking agent accounts for 0.12-0.2% of the activating agent solution.
In the technical scheme, the stirring speed is 300-500 rpm, and the stirring time is 5-10 min.
The invention has the advantages and beneficial effects that:
1. the invention uses water as solvent, which is environment-friendly and simple in preparation method.
2. The first repairing system and the second repairing body in the cement crack activation crosslinking repairing system are mixed and then subjected to polymerization reaction through the oxidation-reduction initiating system, so that the temperature required by the polymerization reaction can be reduced, the polymerization reaction can be carried out at room temperature, and the reaction conditions are simple, so that the application environment requirement is low, the dependence on the external environment is low, and the cement crack activation crosslinking repairing system can be applied to cement crack repairing of various infrastructures.
3. According to the cement crack activation crosslinking repairing system, the activation effect of an activating agent on cement crack repairing is utilized, on one hand, the complexing effect of the activating agent and free calcium ions in cement can promote the dissolution of calcium ions in a cement matrix, a crack repairing reaction site is provided to improve the reactivity of the matrix, and the deposition of inorganic self-repairing products (calcium silicate hydrate, calcium hydroxide and calcium carbonate) is accelerated; on the other hand, the activator can generate polymerization reaction, the generated polymer is inserted into inorganic self-repairing products such as calcium silicate, etc., the polymer provides a template for the deposition of the inorganic self-repairing products, finally, an organic-inorganic composite material is formed to efficiently fill cracks, the synergistic effect of the activation of a cement matrix and the polymerization crosslinking reaction at room temperature can greatly shorten the repairing period, realize the rapid and efficient repairing of the existing cracks, and be suitable for short-time repairing operation.
4. According to the cement crack activation crosslinking repair system, a polymerization reaction is introduced in the deposition process of an inorganic self-repair product, and the generated polymer (sodium polyacrylate, poly AMPS) is inserted in the inorganic self-repair product (hydrated calcium silicate, calcium hydroxide, calcium carbonate and the like) to form an organic-inorganic composite network, so that the structure of a repair area is more perfect.
5. According to the cement crack activation crosslinking repair system, the formed polymer is inserted into the repair area of cement, so that the structure of the repair area is more perfect, the polymer can play a role in transferring load under the action of external force, stress concentration is relieved, the mechanical property of the repair area can be obviously improved, the effectiveness and stability of the repaired cement structure are ensured, the compressive strength of the repaired cement structure is improved by 83% compared with that of the repaired cement structure before repair, and the compressive strength recovery rate of the repaired cement structure is higher than 29.64% compared with that of the cement structure without introducing an activation system experiment group.
6. When the cement crack activation crosslinking repair system is applied, the first repair system and the second repair system are uniformly mixed at room temperature and then directly undergo polymerization reaction in the crack, the activation system accelerates the dissolution and deposition of calcium ions in cement, the reactivity of cement at the crack is improved, and the polymerization crosslinking system can provide a template for the deposition of calcium ions. The advantage of the synergistic effect of the two in the crack is that: (1) The polymerized monomer in the cement crack activation crosslinking repair system can directly act with the cement matrix, the small size of the monomer has good adsorptivity on the surface of the matrix, so that the action efficiency of complex groups in the monomer is improved, and the dissolution of calcium ions in the cement matrix is accelerated; (2) The simultaneous occurrence of complexation deposition and polymerization crosslinking can effectively improve the interfacial adhesion of an organic phase and an inorganic phase in the organic-inorganic composite self-repairing product, and ensure the sealing integrity of a self-repairing area.
7. The cement crack activation crosslinking repairing system can be used for any cracked building formed by cement or concrete, and can repair cracks conveniently and rapidly at room temperature.
Drawings
In fig. 1, (a)/(b)/(c) is a topography of a crack region before the first repair of the cracked cement block, wherein (a) is the cement crack repair system of comparative example 1, (b) is the cement crack repair system of comparative example 2, and (c) is the cement crack activation crosslinking repair system of example 1.
In fig. 1, (d)/(e)/(f) is a topography of a crack region of the repair sample one or the repair sample two, wherein (d) is the cement crack repair system of comparative example 1, (e) is the cement crack repair system of comparative example 2, and (f) is the cement crack activation crosslinking repair system of example 1.
FIG. 2 is a scanning electron microscope image of a crack region of a repair sample III or a repair sample IV, wherein (a) is the cement crack repair system of comparative example 1, (b) is the cement crack repair system of comparative example 2, and (c) is the cement crack activation crosslinking repair system of example 3.
Fig. 3 is a bar graph of compressive strength and compressive strength recovery for the recovery sample three of example 4.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
The materials used in the embodiments of the present invention are as follows:
ordinary Portland cement: sichuan Jiahua corporation, inc.
In a specific embodiment, the reaction mechanism of the activator is: sodium carboxylate contained in the activator is ionized in water to form-COO - It can be combined with Ca in cement 2+ Complexing, so as to improve the reactivity of cement and accelerate the generation of inorganic self-repairing products; the double bonds in the monomers undergo polymerization under a redox initiation system, and then form a dense organic phase, i.e., a polymer, by crosslinking. In the structure with carboxylate ions and double bonds, complexation and polymerization crosslinking reaction synergistically act to form a compact organic-inorganic composite structure in a self-repairing area, so that the repairing efficiency and the sealing integrity of the repaired structure are improved.
Example 1
A cement crack activation crosslinking repair system comprises a first repair system and a second repair system.
The preparation method of the first repair system comprises the following steps:
adding silicate into water, mixing uniformly to obtain silicate solution, stirring the silicate solution at 300rpm, adding a reducing initiator, and mixing for 5min to uniformity at room temperature to obtain a first repairing system, wherein the mass fraction of silicate in the silicate solution is 10%, the mass fraction of the reducing initiator is 1.5% of that of the silicate solution, the silicate is sodium silicate, and the reducing initiator is sodium sulfite.
The preparation method of the second repair system comprises the following steps: adding an activating agent into water, uniformly mixing to obtain an activating agent solution, stirring the activating agent solution at 500rpm, adding an oxidative initiator and a crosslinking agent, and mixing for 10min to uniformity at room temperature to obtain a second repairing system, wherein the activating agent solution contains 10% of the activating agent by mass, 1.8% of the oxidative initiator, 0.15% of the crosslinking agent by mass, the activating agent is sodium acrylate, the oxidative initiator is ammonium persulfate, and the crosslinking agent is N, N-methylene bisacrylamide.
Example 2
A cement crack activation crosslinking repair system comprises a first repair system and a second repair system.
The preparation method of the first repair system comprises the following steps: adding silicate into water, stirring uniformly to obtain silicate solution, adding a reducing initiator into the silicate solution at 500rpm while stirring at room temperature, and mixing for 10min until uniform to obtain a first repair system, wherein the mass fraction of silicate in the silicate solution is 10%, the mass fraction of the reducing initiator is 3% of that of the silicate solution, the silicate is sodium silicate, and the reducing initiator is sodium sulfite.
The preparation method of the second repair system comprises the following steps:
adding an activating agent into water, uniformly stirring to obtain an activating agent solution, adding an oxidizing initiator and a cross-linking agent into the activating agent solution at 400rpm, and mixing for 8min to uniformity at room temperature to obtain a second repairing system, wherein the activating agent solution comprises 10% of the oxidizing initiator by mass, 1.5% of the cross-linking agent by mass, 0.12% of the activating agent solution by mass, the activating agent is sodium itaconic acid, the oxidizing initiator is ammonium persulfate, and the cross-linking agent is N, N-methylene bisacrylamide.
Example 3
A cement crack activation crosslinking repair system comprises a first repair system and a second repair system.
The preparation method of the first repair system comprises the following steps:
adding silicate into water, stirring uniformly to obtain silicate solution, adding a reducing initiator into the silicate solution at 400rpm while stirring at room temperature, and mixing for 8min to uniformity to obtain a first repair system, wherein the mass fraction of silicate in the silicate solution is 10%, the mass fraction of the reducing initiator is 1.2% of that of the silicate solution, the silicate is sodium silicate, and the reducing initiator is sodium thiosulfate.
The preparation method of the second repair system comprises the following steps:
adding an activating agent into water, uniformly stirring to obtain an activating agent solution, adding an oxidizing initiator and a cross-linking agent into the activating agent solution at the speed of 450rpm, and mixing for 6min to uniformity at room temperature to obtain a second repairing system, wherein the activating agent solution comprises 10% of the activating agent by mass, the oxidizing initiator comprises 2% of the activating agent solution by mass, the cross-linking agent comprises 0.2% of the activating agent solution by mass, the activating agent comprises sodium maleate, the oxidizing initiator comprises potassium persulfate, and the cross-linking agent comprises N, N-methylene bisacrylamide.
Example 4
A cement crack activation crosslinking repair system comprises a first repair system and a second repair system.
The preparation method of the first repair system comprises the following steps:
adding silicate into water, stirring uniformly to obtain silicate solution, adding a reducing initiator into the silicate solution at the speed of 450rpm, and mixing for 7min at room temperature to obtain a first repairing system, wherein the mass fraction of silicate in the silicate solution is 10%, the mass fraction of the reducing initiator is 2.7% of that of the silicate solution, the silicate is sodium silicate, and the reducing initiator is sodium thiosulfate.
The preparation method of the second repair system comprises the following steps:
adding an activating agent into water, uniformly stirring to obtain an activating agent solution, adding an oxidizing initiator and a cross-linking agent into the activating agent solution at 500rpm while stirring at room temperature, and mixing for 6min to uniformity to obtain a second repairing system, wherein the activating agent solution comprises 10% of the oxidizing initiator by mass, 1.7% of the cross-linking agent by mass, 0.18% of the activating agent solution by mass, sodium acrylate is used as the activating agent, potassium persulfate is used as the oxidizing initiator, and N, N-methylene bisacrylamide is used as the cross-linking agent.
Comparative example 1
A cement crack repairing system uses the silicate solution prepared in example 1 as a cement crack repairing system.
Comparative example 2
A cement crack repairing system comprises the following steps of uniformly mixing a silicate solution obtained in example 1 and an activator solution to obtain the cement crack repairing system.
The preparation of the cement to be repaired comprises the following steps: mixing tap water and cement according to the ratio of 0.44, stirring to obtain slurry, and performing wet curing, wherein the step refers to GB/T19139-2012, the curing temperature is 30 ℃ +/-2 ℃, and the curing age is set to 7 days;
(1) Taking a cement block with the curing age of 7 days, and uniformly making a seam by using a scalpel to obtain a cracked cement block I, wherein the width of the seam is about 50 mu m.
(2) Taking a cement block with the curing age of 7 days, presplitting the cement block by using a compression-resistant and fracture-resistant integrated machine to obtain a cracked cement block II, wherein the width of a crack is about 50 mu m, and the maximum load is set to be 90% of the compression strength of cement during presplitting, and the duration is 60 seconds.
After uniformly mixing a first repairing system and a second repairing system in the cement crack activation crosslinking repairing system of the embodiment 1 and a first repairing system and a second repairing system in the cement crack activation crosslinking repairing system of the embodiment 3, respectively carrying out 3 times of soaking treatment on a first cracked cement block, wherein each soaking interval is 2-3 days, each time lasts for 30 minutes, and placing the soaked cement block in an environment with the temperature of 30 ℃ and the humidity of 90-95% for curing for 7 days, thereby obtaining a first repairing sample.
The cement crack repairing systems prepared in comparative examples 1 and 2 respectively carry out soaking treatment on the first cracked cement blocks for 2-3 days at intervals of 30 minutes, and the soaked cement blocks are placed in an environment with the temperature of 30 ℃ and the humidity of 90-95% for 7 days, so that a repairing sample II is obtained after 7 days.
After uniformly mixing the first repairing system and the second repairing system in the cement crack activation crosslinking repairing system of the example 2 and after uniformly mixing the first repairing system and the second repairing system in the cement crack activation crosslinking repairing system of the example 4, respectively carrying out 3 times of soaking treatment on the cracked cement block II, wherein the soaking interval is 2-3 days each time, the time duration is 30 minutes each time, and placing the soaked cement block in an environment with the temperature of 30 ℃ and the humidity of 90-95% for curing for 7 days, thereby obtaining a repairing sample III.
The cement crack repairing systems prepared in comparative examples 1 and 2 respectively carry out soaking treatment on the second cracked cement block for 3 times, wherein the soaking interval is 2-3 days, the time length is 30 minutes each time, and the soaked cement block is placed in an environment with the temperature of 30 ℃ and the humidity of 90-95% for curing for 7 days, so that a repairing sample IV is obtained after 7 days.
Fig. 1 (a) is a graph of the appearance of a crack region before the cement crack repairing system prepared in comparative example 1 repairs the first cracked cement block, fig. 1 (b) is a graph of the appearance of a crack region before the cement crack repairing system prepared in comparative example 2 repairs the first cracked cement block, and fig. 1 (c) is a graph of the appearance of a crack region before the cement crack activating and crosslinking repairing system of example 1 repairs the first cracked cement block.
In order to evaluate the repair condition and the repair effect of the crack region, the morphology of the first cracked cement block before repair and the morphology of the first repaired sample, the second repaired sample, the third repaired sample and the fourth repaired sample obtained after repair are subjected to super-field-depth microscope test, the first repaired sample and the second repaired sample are characterized by a scanning electron microscope, and the third repaired sample and the fourth repaired sample obtained before repair and after repair of the second cracked cement block are subjected to compressive strength test.
Fig. 1 (d) is a profile of a crack region of the repair sample two of comparative example 1, fig. 1 (e) is a profile of a crack region of the repair sample two of comparative example 2, and fig. 1 (f) is a profile of a crack region of the repair sample one obtained in example 1. It can be seen from the figure that under the same treatment mode, the same curing mode and curing conditions, the first repairing system and the second repairing system in the cement crack activation crosslinking repairing system of the embodiment 1 are uniformly mixed and then filled into the cement crack, so that the repairing effect on the crack is obvious, and the filling effect of the repaired crack is more obvious.
Fig. 2 (a) is a scanning electron microscope image of a repair sample four obtained in comparative example 1, fig. 2 (b) is a scanning electron microscope image of a repair sample four obtained in comparative example 2, and fig. 2 (c) is a scanning electron microscope image of a repair sample three obtained in example 3. It can be seen from the figure that under the same treatment mode, the same curing mode and curing conditions, the first repairing system and the second repairing system in the cement crack activation crosslinking repairing system of the embodiment 3 are uniformly mixed and then filled into the cement crack, so that the repairing effect on the crack is obvious, and the microstructure of the repairing area is more compact.
Fig. 3 shows the compressive strength of the third restoration sample obtained in example 4, the compressive strength of the fourth restoration sample obtained in comparative example 1, the compressive strength of the fourth restoration sample obtained in comparative example 2, and the compressive strength recovery rate of the third restoration sample obtained in example 4. From the graph, under the same treatment mode, the same curing mode and curing condition, the compressive strength of the repaired sample III obtained after the repair of the example 4 is 18.52MPa, the recovery rate is 83%, the recovery rate is 29.64% higher than that of the comparative examples 1 and 2, and the repairing capability is obviously improved compared with that of the comparative examples 1 and 2.
The calculation formula of the compression recovery rate: η= (σ2- σ1)/σ1.
Wherein: η is the compression recovery rate; sigma 2 is the compressive strength after repair; σ1 is the residual compressive strength (i.e., the initial compressive strength of the cracked cement block two).
The method is environment-friendly, simple, and has synergistic effect on the activation and polymerization crosslinking reaction of the cement matrix, shortens the repairing period, improves the structural integrity of the repairing area, has better overall strength recovery of the cement, and can obtain better mechanical properties while realizing quick repairing. The defects of long repairing period, low repairing efficiency and poor repairing effect of the conventional cement repairing system are effectively overcome.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. The cement crack activation and crosslinking repair system is characterized by comprising a first repair system and a second repair system;
the first repair system includes a silicate solution and a reducing initiator;
the second repair system includes an activator solution, an oxidative initiator, and a crosslinking agent;
the activator in the activator solution is carboxylate containing double bond;
the carboxylate containing double bond is sodium acrylate, sodium itaconic acid or sodium maleate.
2. The cement crack activating and crosslinking repair system of claim 1, wherein the silicate solution is a mixed solution of silicate and water, and the activator solution is a mixed solution of activator and water.
3. The cement crack activating crosslinking repair system of claim 1, wherein the silicate is sodium silicate or potassium silicate.
4. The cement crack activation cross-linking repair system of claim 1, wherein the reductive initiator is sodium sulfite or sodium thiosulfate.
5. The cement crack activating crosslinking repair system of claim 1, wherein the oxidative initiator is ammonium persulfate or potassium persulfate.
6. The cement crack activating crosslinking repair system of claim 1, wherein the crosslinking agent is N, N-methylenebisacrylamide.
7. A method for preparing a first repair system in a cement crack activation cross-linking repair system according to any one of claims 1 to 6, comprising the steps of: adding silicate into water, mixing uniformly to obtain silicate solution, and adding a reducing initiator into the silicate solution at room temperature while stirring uniformly to obtain a first repair system, wherein the mass fraction of silicate in the silicate solution is 10-20%, and the mass fraction of the reducing initiator is 1-3% of that of the silicate solution.
8. A method for preparing a second repair system in a cement crack activation crosslinking repair system according to any one of claims 1 to 6, comprising the steps of:
adding an activating agent into water, uniformly mixing to obtain an activating agent solution, and adding an oxidizing initiator and a cross-linking agent into the activating agent solution at room temperature while stirring until the activating agent solution is uniform to obtain a second repairing system, wherein the activating agent in the activating agent solution has the mass fraction of 10-20%, the oxidizing initiator accounts for 1.5-2.0% of the activating agent solution, and the cross-linking agent accounts for 0.12-0.2% of the activating agent solution.
9. Use of the cement crack activation and cross-linking repair system according to any one of claims 1 to 6 for cement crack repair, wherein the first repair system and the second repair system in the cement crack activation and cross-linking repair system are uniformly mixed at room temperature and then soaked or filled in the cement crack to be repaired.
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