Crack self-healing recycled concrete based on urease-producing microbial mineralization deposition and its preparation method

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...

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 the reduction of the mechanical properties of recycled concrete.

Recycled concrete will inevitably have micro-cracks during its service. Due to the limitations of current detection techniques, it is still difficult to detect and repair these micro-cracks in recycled concrete.