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CN-118221392-B - Microbial interfacial agent for post-cast strip and preparation method and application thereof

CN118221392BCN 118221392 BCN118221392 BCN 118221392BCN-118221392-B

Abstract

The application relates to the technical field of building materials, and particularly discloses a microbial interfacial agent for post-cast strips, and a preparation method and application thereof. The microbial interface agent comprises, by weight, 0.02-0.06 part of bacillus barbituric bacteria liquid, 90-110 parts of cement raw slurry with a water cement ratio of 0.4-0.5, 0.5-1 part of foaming agent, 0.1-0.5 part of compatilizer, 0.2-0.5 part of calcium salt saturated solution and 0.03-0.07 part of aliphatic dihydric alcohol, wherein the compatilizer is one or more of sodium dodecyl sulfate, cocoamide and polyoxyethylene ether, and the calcium salt saturated solution is one or more of calcium acetate solution, calcium formate solution and calcium hypophosphite solution. The application also provides a preparation method of the microbial interfacial agent and an application process in post-cast strips. The microbial interfacial agent provided by the application can effectively improve the bonding strength, leakage resistance and durability of new and old concrete.

Inventors

  • JI SHENGJIE
  • WANG SHAORUI
  • ZHU JIANJUN
  • ZHANG HONG
  • WANG CHANGJUN
  • WANG JIAN
  • WANG SIQI
  • PANG SEN
  • XU DANDAN
  • Jiang Zihang
  • LI XIAOXIAO
  • ZHANG RUI

Assignees

  • 北京中建建筑科学研究院有限公司
  • 北京市建设工程质量第六检测所有限公司
  • 河北雄安科铖检验认证有限公司
  • 中国建筑一局(集团)有限公司

Dates

Publication Date
20260508
Application Date
20240315

Claims (10)

  1. 1. The microbial interface agent for the post-cast strip is characterized by comprising, by weight, 0.02-0.06 part of bacillus barbituric bacteria liquid, 90-110 parts of cement raw slurry with a water cement ratio of 0.4-0.5, 0.5-1 part of foaming agent, 0.1-0.5 part of compatilizer, 0.2-0.5 part of calcium salt saturated solution and 0.03-0.07 part of aliphatic dihydric alcohol; the compatilizer is one or more selected from sodium dodecyl sulfate, cocoamide and polyoxyethylene ether; The calcium salt saturated solution is one or more selected from calcium acetate solution, calcium formate solution and calcium hypophosphite solution.
  2. 2. The microbial interface agent according to claim 1, which is characterized by comprising, by weight, 0.03-0.05 part of bacillus pasteurizer bacterial solution, 96-104 parts of cement raw slurry with a water cement ratio of 0.4-0.5, 0.7-0.9 part of foaming agent, 0.2-0.4 part of compatilizer, 0.3-0.4 part of calcium salt saturated solution and 0.04-0.06 part of aliphatic dihydric alcohol.
  3. 3. The microbial interface agent according to claim 1, wherein the compatilizer is composed of sodium dodecyl sulfate and cocamide in a weight ratio of 3-5:3-5.
  4. 4. A microbial interface agent according to claim 3, wherein the amount of sodium dodecyl sulphate in the compatibilising agent is greater than the amount of cocoamide.
  5. 5. The microbial interface agent of claim 1, wherein the aliphatic diol is one or more of ethylene glycol, 1, 2-propanediol, 1, 2-butanediol, 1, 3-butanediol, neopentyl glycol, 2-methyl-1, 3-propanediol, diethylene glycol, 1, 4-cyclohexanediol, 1, 4-cyclohexanedimethanol.
  6. 6. The microbial interface agent according to claim 5, wherein the aliphatic diol is composed of 1, 2-butanediol and diethylene glycol in a weight ratio of 10:1-2.
  7. 7. The microbial interface agent according to claim 1, wherein the foaming agent comprises, by weight, 1.0-1.4 parts of sodium chloride, 1.2-1.7 parts of sodium thiosulfate, 0.2-0.4 parts of nekal BX, 0.3-0.5 parts of a water reducing agent JN, 0.6-0.10 parts of ammonium chloride, 0.003-0.007 parts of aluminum powder and 0.003-0.007 parts of iron powder.
  8. 8. The method for preparing the microbial interface agent according to any one of claims 1 to 7, which comprises the following steps: adding a foaming agent and a compatilizer with the dosage of one sixth to one half of the foaming agent into the cement primary pulp with the water-cement ratio of 0.4 to 0.5, and uniformly stirring to obtain slurry; Uniformly mixing a calcium salt saturated solution, the residual amount of compatilizer and aliphatic dihydric alcohol to obtain a premix; And adding the bacillus pasteurizer bacteria solution into the slurry, continuously and uniformly mixing, then adding the premix solution, and uniformly mixing to obtain the microbial interfacial agent.
  9. 9. Use of the microbial interface agent according to any one of claims 1-7 in post-cast strip, new and old concrete interfaces.
  10. 10. The new and old concrete interface treatment process is characterized by comprising the following steps of: performing roughening cleaning on the post-cast strip part of the old concrete interface, and fully wetting; spraying the microbial interfacial agent according to any one of claims 1-7 to the old concrete interface with a thickness of 3-5mm, and then spraying 820-880mg/L urea solution; pouring new concrete after 4-6min, fully vibrating, and normally curing according to the construction standard.

Description

Microbial interfacial agent for post-cast strip and preparation method and application thereof Technical Field The application relates to the technical field of building materials, in particular to a microbial interfacial agent for post-cast strips, and a preparation method and application thereof. Background The post-cast strip is a temporary construction joint arranged in order to overcome the defect that harmful cracks can be generated due to temperature, shrinkage, sedimentation and the like in the construction process of the cast-in-place concrete structure. As a part of a concrete building structure, the post-cast strip is an effective measure capable of solving the settlement difference and reducing the shrinkage stress, has corresponding construction standards and requirements, but is frequently affected by factors such as construction space, construction process and the like in the actual construction process, and becomes one of main occurrence nodes and common problems of building leakage. Aiming at the problems, it is very important to develop a post-cast strip (new and old concrete interface) treatment process with convenient construction and excellent anti-leakage performance. Disclosure of Invention In order to solve the technical problems, the application provides a microbial interfacial agent for post-cast strip, and a preparation method and application thereof. The application provides a microbial interface agent for post-cast strips, which comprises, by weight, 0.02-0.06 part of bacillus barbituric bacteria liquid, 90-110 parts of cement primary pulp with a water-cement ratio of 0.4-0.5, 0.5-1 part of foaming agent, 0.1-0.5 part of compatilizer, 0.2-0.5 part of calcium salt saturated solution and 0.03-0.07 part of aliphatic dihydric alcohol; the compatilizer is one or more selected from sodium dodecyl sulfate, cocoamide and polyoxyethylene ether; The calcium salt saturated solution is one or more selected from calcium acetate solution, calcium formate solution and calcium hypophosphite solution. The application is based on a microorganism-induced calcium carbonate deposition technology (MICP technology), utilizes bacillus barbiturae in nature, and can generate urease for decomposing urea by metabolism, and carbonate ions generated after urea decomposition are combined with free metal cations in nature to generate gel crystals, so that the gel crystals can seal the basal plane of new and old concrete, have excellent sealing property, can improve the compactness and apparent strength of a base layer, prevent hollowness and cracking, and improve the leakage resistance. The addition of the compatilizer and the aliphatic dihydric alcohol is mainly used for improving the sealing effect and the water resistance of the concrete interface treating agent, improving the compactness and apparent strength of the concrete interface treating agent and cement after mixing and roughening, improving the crosslinking density and the crosslinking strength between the concrete interface treating agent and an old concrete base layer, obviously improving the water resistance and the durability of the concrete interface treating agent, and obviously improving the adhesive force to the base layer. Preferably, the microbial interface agent specifically comprises the following components, by weight, 0.03-0.05 part of bacillus barbituric bacteria liquid, 96-104 parts of cement raw slurry with a water cement ratio of 0.4-0.5, 0.7-0.9 part of foaming agent, 0.2-0.4 part of compatilizer, 0.3-0.4 part of calcium salt saturated solution and 0.04-0.06 part of aliphatic dihydric alcohol. Preferably, the compatilizer is formed by mixing sodium dodecyl sulfate and cocoamide in a weight ratio of 3-5:3-5. In a specific embodiment, the compatibilizing agent may comprise sodium dodecyl sulfate and cocoamide in a weight ratio of 3:3, 3:4, 3:5, 4:3, 4:4, 4:5, 5:3, 5:4, 5:5. In some specific embodiments, the compatibilizing agent may comprise sodium dodecyl sulfate and cocoamide in a weight ratio of 3-4:3, 3-5:4, 3-4:5, 4:3-4, 4:4-5, 4:3-5, 3-5:3, 4-5:4, 5:3-5. Experimental analysis shows that the application performance of the microbial interfacial agent in the post-pouring belt can be further improved by selecting the sodium dodecyl sulfate and the cocoamide in the weight ratio as the compatilizer. Preferably, the amount of sodium dodecyl sulfate in the compatibilizer is greater than the amount of cocoamide. Preferably, the aliphatic diol is one or more of ethylene glycol, 1, 2-propylene glycol, 1, 2-butanediol, 1, 3-butanediol, neopentyl glycol, 2-methyl-1, 3-propanediol, diethylene glycol, 1, 4-cyclohexanediol, and 1, 4-cyclohexanedimethanol. Preferably, the aliphatic diol is composed of 1, 2-butanediol and diethylene glycol in a weight ratio of 10:1-2. In a specific embodiment, the weight ratio of the 1, 2-butanediol to the diethylene glycol in the aliphatic diol may be 10:1, 10:1.5, 10:2. In some specific embodiments, the weig