Microorganism-based crack depth-width three-dimensional self-repairing concrete and preparation method thereof

Abstract

The invention discloses microorganism-based crack depth-width three-dimensional self-repairing concrete and a preparation method thereof. The concrete is prepared from 30-120 parts of a microbial self-repairing agent, 0-50 parts of probiotics-loaded expanded perlite, 0-50 parts of an oxygen slow-release agent, 0-50 parts of nutrient-loaded expanded perlite, 23 parts of expanded perlite with the particle size of 120 mesh, 350-500 parts of cement, 1000-1300 parts of pebbles, 400-600 parts of sand, 30-50 parts of silica fume, 2-4 parts of polypropylene fiber, 4-6 parts of a water reducer and 250-350 parts of water. A four-component repair system composed of the microbial self-repairing agent, the oxygen slow-release agent, the probiotics-loaded expanded perlite and the nutrient-loaded expanded perlite is combined with the polypropylene fiber to form the crack depth-width three-dimensional self-repairing concrete. The concrete can remedy the deficiency that the crack depth-direction repaireffect of a current concrete crack self-repairing technology is poor, the durability of the concrete is improved, and meanwhile the concrete is environmentally friendly and light and has a heat insulation function.

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.