Intelligent concrete crack self repairing material preparation method

Abstract

The invention relates to an intelligent concrete crack self repairing material preparation method, which comprises the following steps: the raw materials of 30%-50% by mass of an active chemical component, 10%-20% of a reaction promoter, 10%-20% of an Al<3 +> additive, 10%-20% of a silicic acid radical additive, and 10%-20% of a Ca <2 + > additive are weighed; first, the active chemical component, the Ca <2 + > additive, the silicic acid radical additive and the Al<3 +> additive are weighed according to the weight ratio and evenly mixed; the mixture is placed in a ball mill for ball milling for 30min at the rotational speed controlled at 400r / min, the weight of screen residue of a 80um square hole sieve is less than 5%, finally the reaction promoter is added for mixing and milling for 15min to prepare concrete crack self repairing material masterbatch; when in use as a paint, a concrete crack self repairing material can be obtained by evenly mixing the masterbatch, quartz sand and cement according to the mass ratio of 1:10:20. The concrete crack self repairing material is simple and practical, and, compared with the prior art, can be used in the interior of concrete, also can be used by brushing on the surface of the concrete with cracks, and is convenient and easy to use. At the same time, the concrete crack self repairing material can also play a good effect to repair micro cracks, and the defects of large construction difficulty and not good enough repair effect of a bionic self repairing concrete construction method can be compensated.

Description

technical field [0001] The invention relates to the field of concrete intelligent repair materials, in particular to a method for preparing intelligent concrete crack self-repair materials. Background technique [0002] Concrete cracking is a worldwide technical problem. The premature failure caused by cracking has brought huge economic losses to the maintenance of concrete structures. At the same time, if the inspection or maintenance is not in place, it will also bury safety hazards and cause more serious consequences. [0003] In terms of micro-crack repair, concrete self-healing materials have advantages that cannot be compared with traditional methods. When cracks occur, the concrete self-repair mechanism can be activated to perform a series of reactions or actions to achieve repair. If microscopic damage can be effectively repaired before it develops into macroscopic cracks, the safety and service life of the structure will be greatly improved. Therefore, this method ...

AI Technical Summary

Problems solved by technology

[0004] The working principle of the bionic concrete crack self-healing structure is simple and clear, and the scientific research results are rich. Scholars at home and abroad have prepared various test devices to verify the repair effect of concrete. The promotion and application of cracked concrete self-healing structures mainly include the following points:

[0005] (1) The number of glass fiber tubes or microcapsules is difficult to determine

Concrete substrates with different ratios have different properties. The number of glass tubes or capsules directly determines the degree of self-healing of the matrix concrete. If the number is too small, the crack repair is not thorough enough, and if the number is too large, it may damage the macroscopic properties of the matrix concrete.

[0006] (2) The performance matching problem of glass fiber tube or microcapsule and matrix material is difficult to solve

[0007] (3) The repairing effect of the binder. The existing binder is mainly an organic binder with a high viscosity. If the viscosity is too high, the fluidity of the binder in the concrete crack will be greatly reduced, which is for the smaller width. microcracks are bad

[0008] (4) Difficult to construct and difficult to apply on a large scale

However, most of the existing adhesives have a short shelf life, and are prone to aging and failure under external light and heat conditions. Performance degradation affects the repair effect of concrete

[0010] The above bionic self-healing concrete structure method has its own shortcomings and deficiencies, which hinder the popularization and use of bionic self-healing concrete materials. Based on the needs of industrial self-healing concrete materials, it is of great practical significance to study a method for preparing intelligent concrete crack self-healing materials

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