Electromagnetic controlled-release microcapsule/steel fiber self-repairing concrete and preparation method thereof

Abstract

The invention relates to electromagnetic controlled-release microcapsule / steel fiber self-repairing concrete and a preparation method thereof. The electromagnetic controlled-release microcapsule / steelfiber self-repairing concrete is prepared from cement, coal ash, a fine aggregate, a coarse aggregate, electromagnetic controlled-release microcapsules, surface-treated steel fibers, a water reducingagent and water. According to the invention, the prepared electromagnetic controlled-release microcapsules and the surface-treated steel fibers are added into concrete; the steel fibers are subjectedto eddy heat generation through an external electromagnetic field, a microcapsule wall material is heated and melted by utilizing the excellent heat conduction effect of graphite and high-heat-conductivity fibrous carbon powder, isocyanate in microcapsules is released, and the isocyanate and water in the concrete are subjected to chemical reaction to generate a cured product, so that the internaldamage and microcracks of the concrete are repaired. The electromagnetic controlled-release microcapsule / steel fiber self-repairing concrete prepared by the method is high in heating speed in the external electromagnetic field and good in repairing effect on the internal damage and microcracks of the concrete, and the service life of a concrete structure is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a self-repairing concrete and a preparation method thereof. Background technique [0002] Cement concrete is the most widely used building material, widely used in industrial and civil buildings, roads and bridges, subways, tunnels, hydropower stations, ports and wharves and other construction fields. However, concrete is a brittle material, which is prone to internal damage and micro-cracks during use, which not only reduces the strength of concrete, but also becomes a channel for corrosive substances to penetrate into the interior of the concrete, accelerating the chemical erosion of concrete and the corrosion of internal steel bars. As a result, the durability of concrete is reduced, and the service life of concrete is greatly shortened. [0003] In order to improve the durability of concrete, more and more attention has been paid to concrete with crack self-heal...

AI Technical Summary

Problems solved by technology

However, due to the limited mixing amount of microcapsules in concrete, and the low content of magnetic iron powder in microcapsules, the heating rate of microcapsules in concrete is very slow under the action of an external electromagnetic field, and it takes a long time for the action of an external electromagnetic field to make the microcapsules The melting of the wall material of the capsule greatly limits the effect of the microcapsule on repairing the internal damage and micro-cracks of the concrete, restricting its practical application

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