Concrete crack self-repairing agent as well as preparation method and application thereof

Abstract

The invention discloses a concrete crack self-repairing agent which is mainly composed of a liquid raw material A and a solid raw material B. The liquid raw material A comprises the following specific components in parts by weight: 10-25 parts of chitosan, 20-50 parts of cellulose fiber and 10-25 parts of epoxypropane; the solid raw material B comprises the following specific components in parts by weight: 100-200 parts of calcium oxide, 10-25 parts of bauxite, 20-40 parts of metakaolin, 5-10 parts of calcium carbonate, 100-150 parts of an expanding agent and sufficient water. The concrete crack self-repairing agent provided by the invention is doped, so that the compressive strength of concrete is improved, the compressive strength after crack repairing is higher than that before crack prefabrication, the compressive strength after concrete crack repairing is improved, the strength recovery rate is relatively good and can reach 155%, the crack repairing effect is relatively good, and the cracks are completely healed; the self-repairing effect is good; and after being added into concrete, the anti-freezing agent can improve the compactness of slurry, reduce holes, has better compatibility with a matrix, is beneficial to crack repair, obviously improves the freezing resistance, has a good application prospect, and is suitable for wide popularization and application.

Description

technical field [0001] The invention relates to the technical field of concrete crack repair, in particular to a concrete crack self-repairing agent and a preparation method and application thereof. Background technique [0002] As a micro-porous brittle material, concrete is easily affected by external conditions such as external load and temperature, resulting in different degrees of micro-cracks and local damage. Micro-cracks in concrete will affect the durability and noise of components, thus affecting the service performance of concrete components. On the one hand, it is difficult to detect micro-cracks non-destructively and accurately with the existing technologies, and it is also difficult to repair internal micro-cracks by conventional methods. On the other hand, the self-healing phenomenon of concrete micro-cracks has been observed in natural environment for many years due to the formation of calcium carbonate and continuous hydration of anhydrous cement materials,...

AI Technical Summary

Problems solved by technology

Concrete microcracks will affect the durability and sound of components, thereby affecting the service performance of concrete components.

On the one hand, it is difficult for existing technologies to detect micro-cracks non-destructively and accurately, and conventional methods are also difficult to repair internal micro-cracks.

On the other hand, self-healing of concrete microcracks has been observed in natural environments for many years due to the formation of calcium carbonate and continuous hydration of anhydrous cementitious materials, but the self-healing efficiency of these microcracks is relatively low, so improving The study of concrete to improve the self-healing ability of cracks has received more and more attention from academia and engineering circles

[0003] Although the above research on the self-healing of concrete cracks has made remarkable progress, there are still many problems to be solved urgently. Hollow fibers or capsules are easily broken, shape memory alloys are expensive and will cause creep after long-term use, and the evaluation of the self-healing effect of electrodeposition There is relatively little method research, making the above technologies immature

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