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CN-121974625-A - Hydraulic concrete crack self-repairing material based on double capsules

CN121974625ACN 121974625 ACN121974625 ACN 121974625ACN-121974625-A

Abstract

The application relates to the technical field of hydraulic engineering, in particular to a hydraulic concrete crack self-repairing material based on double capsules. The hydraulic concrete crack self-repairing material based on the double capsules is prepared by putting cement, fly ash, slag powder, fine aggregate, coarse aggregate and a double-microcapsule system into a stirrer according to the formula amount, dry-mixing for 1-2 minutes to uniformity, then adding a water reducer and water, and stirring for 3-5 minutes to obtain the hydraulic concrete crack self-repairing material based on the double capsules. The hydraulic concrete crack self-repairing material based on the double capsules has the advantages of high repairing efficiency, accurate repairing time control, good strength recovery of repaired concrete and convenient construction.

Inventors

  • AN XIAOGUANG
  • WANG ZIXU
  • SHI LEI
  • LI BING
  • WANG WENJING
  • WANG LUTING
  • DU XIAOLING
  • ZHANG RUITIAN

Assignees

  • 郑州工程技术学院

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The hydraulic concrete crack self-repairing material based on the double capsules is characterized by comprising, by mass, 300-400 parts of cement, 50-100 parts of fly ash, 50-100 parts of slag powder, 600-700 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 1-3 parts of water reducer, 0.3-1 part of double microcapsule system and 150-180 parts of water; The double-microcapsule system consists of a chemical repair microcapsule and a microbial repair microcapsule, wherein the mass ratio of the chemical repair microcapsule to the microbial repair microcapsule is 0.5-1.5:1; the hydraulic concrete crack self-repairing material based on the double capsules is prepared by the following steps: And (3) placing the cement, the fly ash, the slag powder, the fine aggregate, the coarse aggregate and the double microcapsule system into a stirrer according to the formula amount, dry-mixing for 1-2 minutes to uniformity, then adding the water reducer and water, and stirring for 3-5 minutes to obtain the double-capsule-based hydraulic concrete crack self-repairing material.
  2. 2. The dual-capsule-based hydraulic concrete crack self-repairing material according to claim 1, wherein the chemical repairing microcapsule is prepared by the following steps: 1, weighing 10-20 parts of sodium alginate, 20-40 parts of low-substituted hydroxyethyl cellulose, 10-30 parts of polyacrylic acid super absorbent resin, 4-8 parts of calcium chloride, 1-2 parts of glutaraldehyde, a pH regulator, 40-80 parts of absolute ethyl alcohol and 140-250 parts of deionized water according to parts by weight; a2, dissolving sodium alginate in 60-110 parts of deionized water, and then adding polyacrylic acid super absorbent resin for mixing to obtain solution A; A3, dissolving calcium chloride in 60-100 parts of deionized water, adding the solution A, mixing to obtain gel particles, filtering, washing and drying to obtain particles A; a4, dissolving glutaraldehyde in 20-40 parts of deionized water, and then regulating the pH value to 5-7 by using a pH regulator to obtain solution B; and A5, dissolving the low-substituted hydroxyethyl cellulose in absolute ethyl alcohol, sequentially adding the solution B and the particles A, mixing, and drying to obtain the chemical repair microcapsule.
  3. 3. The dual-capsule-based hydraulic concrete crack self-repairing material according to claim 1, wherein the microbial repairing microcapsule is prepared by the following steps: B1, dissolving chitosan in acetic acid solution, stirring to form chitosan solution, mixing volcanic rock with the chitosan solution, and spray drying to obtain a volcanic rock-chitosan carrier; B2, inoculating bacillus pasteurization freeze-dried powder into a sterilized LB (liquid-solid) culture medium for culture, then adjusting the concentration of bacterial suspension to 5-6 multiplied by 10 8 CFU/mL to form bacillus pasteurization bacterial suspension, inoculating vibrio desulfurization freeze-dried powder into a sterilized anaerobic culture medium for culture, then adjusting the concentration of bacterial suspension to 2-3 multiplied by 10 8 CFU/mL to form vibrio desulfurization bacterial suspension, obtaining double bacterial suspension, mixing with a volcanic-chitosan carrier, stirring, centrifuging, removing supernatant, and drying to obtain a carrier; And B3, preparing nutrient solution, mixing the nutrient solution with the bacteria-carrying carrier to form microcapsules, preparing slurry, immersing the microcapsules in the slurry, taking out, placing in a calcium chloride solution for crosslinking for 1-2h, curing, and drying to obtain the microbial repair microcapsules.
  4. 4. The dual-capsule-based hydraulic concrete crack self-repairing material according to claim 2, wherein the pH regulator is 0.1mol/L hydrochloric acid or 0.1mol/L sulfuric acid.
  5. 5. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, wherein the mass-volume ratio of the chitosan in the step B1 to the acetic acid solution is 1-2 g/100 ml.
  6. 6. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, wherein the mass ratio of the volcanic rock to the chitosan solution is 1:5-6.
  7. 7. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, wherein the spray drying is carried out at an inlet air temperature of 170-180 ℃ and an outlet air temperature of 70-80 ℃ and the feeding speed is 8-10mL/min.
  8. 8. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, wherein the dual-bacterial suspension consists of a bacillus pasteurization bacterial suspension and a vibrio desulphurisation bacterial suspension, and the volume ratio of the bacillus pasteurization bacterial suspension to the vibrio desulphurisation bacterial suspension is 1-2:1.
  9. 9. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, wherein the mixing in the step B2 is performed, and the mass ratio of the volcanic-chitosan carrier to the dual-bacterial suspension is 1:5-6.
  10. 10. A dual-capsule-based hydraulic concrete crack self-repairing material according to claim 3, characterized in that the slurry consists of 1-2wt% sodium alginate, 1-2wt% gelatin, 0.5-1wt% sodium bicarbonate and water.

Description

Hydraulic concrete crack self-repairing material based on double capsules Technical Field The application relates to the technical field of hydraulic engineering, in particular to a hydraulic concrete crack self-repairing material based on double capsules. Background At present, the concrete crack is repaired by adopting traditional methods such as external grouting, surface coating and the like, and the methods have the defects of complex construction, high cost, delayed repair time and the like. In recent years, self-repairing concrete technology has become a research hotspot, and microcapsule technology has been widely focused on advantages of strong design, easy dispersion in a matrix, prolonged timeliness of a core material and the like. The microcapsule self-repairing concrete has two main types, one is chemical repairing type and the other is microorganism repairing type. However, the prior art still has the disadvantages of (1) the limitation of a single repair mechanism, that is, the chemical repair reaction is rapid but the durability of the repair product is poor, and that the microbial repair product has good durability but a slower reaction speed. (2) The repairing time is inaccurate, most microcapsules release the repairing agent immediately when the crack is generated, but for the crack which is opened and closed under the action of reciprocating load, the repairing agent can be released before the crack is not stably closed, so that the repairing effect is poor. (3) The microorganism survival rate is low, and the concrete high alkali environment is unfavorable for the long-term survival of microorganisms, and affects the durability of the repairing effect. Disclosure of Invention Aiming at the problems, the application provides the hydraulic concrete crack self-repairing material based on double capsules, which realizes multi-stage and intelligent self-repairing of the hydraulic concrete crack by the synergistic effect of the chemical repairing microcapsule and the microbial repairing microcapsule, remarkably improves the crack repairing efficiency and quality and prolongs the service life of the hydraulic building. In order to achieve the aim, the application provides a double-capsule-based hydraulic concrete crack self-repairing material, which comprises 300-400 parts of cement, 50-100 parts of fly ash, 50-100 parts of slag powder, 600-700 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 1-3 parts of water reducer, 0.3-1 part of double-microcapsule system and 150-180 parts of water by mass; The double-microcapsule system consists of a chemical repair microcapsule and a microbial repair microcapsule, wherein the mass ratio of the chemical repair microcapsule to the microbial repair microcapsule is 0.5-1.5:1; the hydraulic concrete crack self-repairing material based on the double capsules is prepared by the following steps: And (3) placing the cement, the fly ash, the slag powder, the fine aggregate, the coarse aggregate and the double microcapsule system into a stirrer according to the formula amount, dry-mixing for 1-2 minutes to uniformity, then adding the water reducer and water, and stirring for 3-5 minutes to obtain the double-capsule-based hydraulic concrete crack self-repairing material. The chemical repair microcapsule is prepared by the following steps: 1, weighing 10-20 parts of sodium alginate, 20-40 parts of low-substituted hydroxyethyl cellulose, 10-30 parts of polyacrylic acid super absorbent resin, 4-8 parts of calcium chloride, 1-2 parts of glutaraldehyde, a pH regulator, 40-80 parts of absolute ethyl alcohol and 140-250 parts of deionized water according to parts by weight; a2, dissolving sodium alginate in 60-110 parts of deionized water, and then adding polyacrylic acid super absorbent resin for mixing to obtain solution A; A3, dissolving calcium chloride in 60-100 parts of deionized water, adding the solution A, mixing to obtain gel particles, filtering, washing and drying to obtain particles A; a4, dissolving glutaraldehyde in 20-40 parts of deionized water, and then regulating the pH value to 5-7 by using a pH regulator to obtain solution B; and A5, dissolving the low-substituted hydroxyethyl cellulose in absolute ethyl alcohol, sequentially adding the solution B and the particles A, mixing, and drying to obtain the chemical repair microcapsule. The microbial repair microcapsule is prepared by the following steps: B1, dissolving chitosan in acetic acid solution, stirring to form chitosan solution, mixing volcanic rock with the chitosan solution, and spray drying to obtain a volcanic rock-chitosan carrier; B2, inoculating bacillus pasteurization freeze-dried powder into a sterilized LB (liquid-solid) culture medium for culture, then adjusting the concentration of bacterial suspension to 5-6 multiplied by 10 8 CFU/mL to form bacillus pasteurization bacterial suspension, inoculating vibrio desulfurization freeze-dried powder into a sterilized anaerobic cultu