Crack self-healing concrete using aerobic alkaliphilic microorganisms and preparation method thereof

Abstract

The invention relates to crack self-repairing concrete using aerobic basophilic microorganisms and a preparation method thereof. The concrete contains expanded perlite loading an aerobic basophilic microorganism repair agent, cement, pebbles, sand, silica fume, water, calcium lactate and water reducer. The crack self-repairing concrete has the crack self-repairing function and has heat-preservation and heat-insulation functions, the aerobic basophilic microorganisms serve as a crack repairing agent, calcium lactate serves as nutritional matter for microorganism metabolism, and expanded perlite serves as a carrier of the crack repairing agent. When concrete cracks, water and air enters the cracks so that resting microorganisms can restore the metabolism function, calcium lactate is converted into calcium carbonate precipitate, and accordingly the aims of automatically diagnosing and repairing the concrete cracks, preventing expansion of the cracks and improving concrete impermeability are achieved. The microorganism crack self-repairing concrete serves as a concrete material integrating the functions of crack self-diagnosis and self-repairing, lightweight, heat preservation and heat insulation, and has large research value and application potential.

Description

technical field [0001] The invention relates to a concrete material, especially a crack self-repairing concrete material, in particular to a crack self-repairing concrete which uses aerobic alkaliphilic microorganism technology to realize crack self-diagnosis and self-repair, and has the function of heat preservation and heat insulation. Background technique [0002] Concrete is widely used in construction engineering because of its advantages of high compressive strength, good durability and low cost. However, concrete is a typical brittle material, which will inevitably produce micro-cracks or local damage under the action of external force or other factors, resulting in a decrease in its mechanical properties and durability. If effective treatment measures are not taken in time, the cracks may further expand, making it easier for harmful substances such as water, oxygen, carbon dioxide, and chlorides to enter the interior of the concrete, which may cause corrosion of stee...

AI Technical Summary

Problems solved by technology

Although the above methods can achieve self-repair of concrete cracks to a certain extent, these methods also have obvious deficiencies: 1. Mineral self-repair method has limited repair amount and low repair efficiency; 2. Fiber-reinforced cement-based composite Although the material has higher potential self-healing performance than ordinary concrete, it is still affected by age, environmental media, temperature and humidity, and admixtures, etc., which takes a long time and the effect is not obvious; 3. The repair adhesive injected into microcapsules The agent is generally toxic, which greatly affects the application of the research results in construction projects, and how to choose the nature and quantity of the carrier of the repair agent and whether it can be repaired multiple times without affecting the performance of the concrete still needs to be further studied. Verification; 4. The cost of the concrete active self-healing system using smart devices is too high, which limits its application in construction projects