Microbe-based three-dimensional self-healing concrete with deep and wide cracks and its preparation method

Abstract

The invention discloses a three-dimensional self-repairing concrete with depth and width of cracks based on microorganisms and a preparation method thereof. Its components are 30-120 parts of microbial self-healing agent, 0-50 parts of expanded perlite loaded with bacteria, 0-50 parts of oxygen slow-release agent, 0-50 parts of expanded perlite loaded with nutrients, and expanded perlite with a particle size of 120 mesh 23 parts, 350~500 parts cement, 1000~1300 parts gravel, 400~600 parts sand, 30~50 parts silica fume, 2~4 parts polypropylene fiber, 4~6 parts water reducer, 250~350 parts water. The four-component repair system composed of microbial self-repair agent, oxygen slow-release agent, bacteria-loaded expanded perlite, and nutrient-loaded expanded perlite is combined with polypropylene fiber to form a three-dimensional self-repair concrete with deep and wide cracks. The invention can make up for the poor repairing effect of the current concrete crack self-repairing technology in the crack depth direction, improve the durability of the concrete, and at the same time, the concrete also has the functions of green, light weight and heat insulation.

Description

technical field [0001] The invention relates to the field of microbial self-repairing concrete materials, in particular to a three-dimensional self-repairing concrete with depth and width of cracks based on microorganisms and a preparation method thereof. Background technique [0002] Concrete is the most widely used and used building material in the field of civil engineering. However, concrete is affected by factors such as temperature changes, external loads or corrosion during construction and service, and it is difficult to avoid local damage such as micro-cracks inside or on the surface of concrete. The generation of concrete micro-cracks will further expand, resulting in a reduction in the durability and bearing capacity of the structure, and eventually the structural components will be damaged. [0003] To solve the problem of reduced durability of concrete structures caused by cracking of cement-based materials, compared with ordinary self-healing concrete, the con...

AI Technical Summary

Problems solved by technology

However, the urease-producing microorganisms used in this method produce a large amount of ammonia gas when producing mineralized deposits, causing pollution to the environment, and at the same time, the effect of repairing deep cracks inside the concrete is poor.

[0006] In summary, the proposed microbial mineralization self-repair method has excellent repair effect on concrete surface micro-cracks, but poor repair effect on crack depth direction.