Crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and preparation method

A technology of recycled concrete and microorganisms, applied in the field of crack self-healing recycled concrete materials and crack self-repairing recycled concrete, which can solve the problems of reduced mechanical properties of recycled concrete, and achieve extended life, good durability, volume stability, and compatibility. Good results

Active Publication Date: 2017-05-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are certain defects in the crushing process of recycled coarse aggregate, and the accumulation of crushing damage causes a large number of micro-cracks inside and on the surface of the recycled aggregate, which is also an important factor that leads to t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A crack self-healing recycled concrete based on the mineralization deposition of urease-producing microorganisms, which is made of the following raw materials in parts by weight:

[0046] 90 parts of expanded perlite particles loaded with urease-producing microorganisms and wrapped on the surface, 400 parts of cement, 562 parts of recycled coarse aggregate, 562 parts of natural stone, 475 parts of sand, 22 parts of silica fume, urease-producing microorganism suspension (concentration of 5.5×10 7 22 parts per mL), 193 parts of water, 8 parts of urea, 8 parts of calcium chloride, and 4 parts of superplasticizer.

[0047] The preparation method of the expanded perlite particles loaded with urease-producing microorganisms and wrapped on the surface comprises the following technical process:

[0048] Vector preparation:

[0049] (1) Select Bacillus pasteurianum, purify and cultivate the strain;

[0050] (2) Preparation of medium for Bacillus pasteurianus (content of each ...

Embodiment 2

[0066] A crack self-healing recycled concrete based on the mineralization deposition of urease-producing microorganisms, which is made of the following raw materials in parts by weight:

[0067] 100 parts of expanded perlite particles loaded with alkaliphilic urease bacteria and wrapped on the surface, 420 parts of cement, 575 parts of recycled coarse aggregate, 575 parts of natural stone, 500 parts of sand, 24 parts of silica fume, urease-producing microorganism suspension (concentration 5.5×10 7 23 parts per mL), 202 parts of water, 8 parts of urea, 8 parts of calcium chloride, and 4 parts of superplasticizer.

[0068] The preparation method is the same as in Example 1.

Embodiment 3

[0070] A crack self-repairing regeneration concrete based on the mineralized deposition of urease bacteria, which is made of the following raw materials in parts by weight:

[0071] 115 parts of expanded perlite particles loaded with alkaliphilic urease bacteria and wrapped on the surface, 450 parts of cement, 826 parts of recycled coarse aggregate, 354 parts of natural stone, 530 parts of sand, 26 parts of silica fume, urease-producing microorganism suspension (concentration 6.0×10 7 24 parts per mL), 216 parts of water, 9 parts of urea, 9 parts of calcium chloride, and 5 parts of superplasticizer.

[0072] The preparation method is the same as in Example 1.

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Abstract

The invention discloses crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and a preparation method. The crack self-remediation regenerated concrete comprises components, namely, expanded perlite carried with urease production microorganisms, cement, stone, sand, silica fume, water, urea, calcium chloride, a urease production microorganism suspension and a water reducing agent. The urease production microorganisms are adopted as a concrete crack remediation agent, urease can be generated through metabolism through the urease production microorganisms, and the urea can be decomposed into NH4<+> and CO3<2+>, and furthermore the calcium carbonate can be mineralized and deposited to remedy cracks. In the preparation process, a part of the crack remediation agent is directly mixed with the concrete, then cracks and holes in regenerated crude aggregate self and weak adhesion areas between regenerated aggregate and a new cement stone base can be remedied, and thus the mechanical property of the regenerated concrete can be improved; meanwhile, the other part of the crack remediation agent is firstly adsorbed into an expanded perlite carrier and is further mixed into the concrete, then the crack self-remediation property of the regenerated concrete in the service period can be improved, and thus the anti-penetrability performance and the durability of the regenerated concrete can be improved.

Description

technical field [0001] The invention relates to a recycled concrete material, especially a crack self-repairing recycled concrete material, in particular to a crack self-repairing recycled concrete based on urease-producing microbial mineralization deposition technology to realize crack self-diagnosis and self-repair, and to be green and energy-saving. Background technique [0002] Due to the advantages of high compressive strength, good durability, and low cost, concrete is widely used in engineering fields such as industrial and civil construction projects, road and bridge engineering, and underground engineering. However, concrete will inevitably produce cracks and local damage during the service process. If effective measures are not taken in time, the cracks may further expand, eventually leading to a significant decrease in the mechanical properties and durability of concrete. The diagnosis and repair of cracks in concrete structures during service is a technical probl...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B20/10C12N11/14
CPCC04B20/10C04B20/1074C04B28/00C04B2111/00017C12N11/14C04B14/185C04B14/02C04B18/16C04B14/06C04B18/146C04B2103/0001C04B24/126C04B22/124C04B2103/302
Inventor 李珠张家广赵林
Owner TAIYUAN UNIV OF TECH
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