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A microbial repair agent for self-healing of marine concrete cracks

A microbial repair and concrete technology, applied in the field of concrete self-repair, can solve the problems of economic loss and casualties, damage accumulation, low tensile strength, etc., to reduce the generation of expansive erosion products, improve mechanical occlusal effect, improve the resistance The effect of compressive strength

Active Publication Date: 2021-07-30
ROAD & BRIDGE SOUTH CHINA EINGINEERING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, concrete is a heterogeneous anisotropic material with high brittleness and low tensile strength. Due to the influence of deformation, aging, corrosion and other unfavorable factors during use, it is easy to produce damage accumulation, resulting in micro-cracks.
Microcracks will not only reduce the integrity of concrete, but also provide channels for corrosive substances. The entry of corrosive substances will reduce the durability of concrete, and may even lead to corrosion of steel bars, resulting in damage to structural components, resulting in irreparable economic losses and casualties
At present, the main repair methods for concrete cracks are post repair or regular repair. However, this passive and planned repair method consumes a lot of manpower and material resources, and it is still difficult to repair small cracks.

Method used

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  • A microbial repair agent for self-healing of marine concrete cracks
  • A microbial repair agent for self-healing of marine concrete cracks
  • A microbial repair agent for self-healing of marine concrete cracks

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A preparation method of a microbial remediation agent, comprising:

[0051] Treatment of coral reef calcareous sand: Weigh 50g of coral reef calcareous sand, put it into a 1000mL three-necked flask, prepare 1.8wt% polyoxyethylene anhydrous toluene solution, and add 55.6g polyoxyethylene anhydrous toluene solution to the above container In medium, stir mechanically, add a small amount of distilled water dropwise, absorb for 45min, add dropwise 100mL ethanol solution containing 2.4vol% vinyl methyl ether, absorb for 60min, filter with suction, wash with absolute ethanol and distilled water for 3 times, and dry at 42°C to constant weight.

[0052] Coral reef calcareous sand is crushed and sieved from coral reefs as raw materials to obtain solid particles with a particle size of less than 5mm, a fineness modulus of 2.5, and a bulk density of 1320kg / m 3

[0053] The liquid culture medium used by Bacillus coerlii is: peptone 5g, beef extract 3g, NaHCO 3 0.42g, Na 2 CO 3...

Embodiment 2

[0058] 200g bacteria-carrying coral reef calcareous sand is put into 400g the mixed solution that contains 12wt% calcium lactate and 3wt% Pingpingjia, and all the other parts are completely consistent with embodiment 1.

Embodiment 3

[0060] A preparation method for crack self-healing concrete, comprising:

[0061] The composition and parts by weight of the concrete include: 432 parts of cement, 225 parts of seawater, 430 parts of gravel, 20 parts of silica fume, 200 parts of the microbial remediation agent prepared by the present invention, 410 parts of river sand, and 4 parts of water reducing agent.

[0062] Among them, the cement used is Huaxin Cement Co., Ltd. P.O.42.5 cement; the maximum particle size of crushed stone is 20mm, and the bulk density is 1625kg / m 3 ;The water reducer is a high-efficiency polycarboxylate water reducer with a solid content of 40% and a water reducing rate of 26%. The river sand is ordinary quartz sand with a fineness modulus of 2.8 and a bulk density of 1560kg / m 3 ; Silica fume, average particle size 180nm, specific surface area 13000m 2 / kg; seawater is artificially prepared seawater, the chemical composition is: NaCl 24.53g / L, MgCl 2 5.2g / L, Na 2 SO 4 4.09g / L, CaCl ...

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Abstract

The invention provides a microbial repairing agent for self-repairing of marine concrete cracks, which belongs to the technical field of concrete self-repairing, and comprises Bacillus kirsi, regulator, calcium lactate, and coral reef calcareous sand, and uses polyoxyethylene, vinyl methyl ether After the coral reef calcareous sand is treated, the Bacillus colii, regulator and calcium lactate are immobilized on the coral reef calcareous sand. The invention can increase the surface roughness of coral reef calcareous sand, improve the bonding strength of the interface transition zone, reduce gaps, and suppress SO 4 2‑ Enter the interior of the concrete to reduce the increase of expansive erosion products; the calcium carbonate particles that can regulate the formation of Bacillus kirsi are mainly stable calcite type, and can form a dense and structurally stable sealing layer in the cracks.

Description

technical field [0001] The invention belongs to the technical field of concrete self-repair, and in particular relates to a microbial repair agent for self-repair of cracks in marine concrete. Background technique [0002] Concrete is the most widely used and used building material in the field of civil engineering. However, concrete is a heterogeneous and anisotropic material with high brittleness and low tensile strength. Due to the influence of deformation, aging, corrosion and other unfavorable factors during use, it is easy to accumulate damage and cause microcracks. Microcracks will not only reduce the integrity of concrete, but also provide channels for corrosive substances. The entry of corrosive substances will reduce the durability of concrete, and may even lead to corrosion of steel bars, resulting in damage to structural components, resulting in irreparable economic losses and Casualties. At present, the main repair methods for concrete cracks are post-event re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B28/04C04B111/24
CPCC04B28/04C04B40/0039C04B2111/24C04B14/28C04B24/32C04B2103/0001C04B24/06C04B22/0026C04B14/02C04B18/146C04B14/06C04B2103/302
Inventor 王金梁张勇王道隆李涛赖小颖黄亚娥孙浩铭
Owner ROAD & BRIDGE SOUTH CHINA EINGINEERING CO LTD
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