Biological admixture for self-healing of concrete microcracks and preparation method of biological admixture

Abstract

The invention provides a biological admixture for self-healing of concrete microcracks and a preparation method of the biological admixture. The biological admixture is prepared from components and raw materials in parts by mass as follows: 0.5-3 parts of phosphate, 0.1-1.0 part of sulfate, 0.01-1.5 parts of chlorine salt, 0.25-1.2 parts of citrate, 0.5-3.2 parts of peptone, 0.2-2 parts of a yeast extract, 1,000-1,050 parts of distilled water, 0.1-10 parts of urea, 0.5-2 parts of a beef extract, 10-20 parts of agar, 10-15 parts of white carbon black, 0.1-8 parts of calcium lactate, a proper amount of sodium hydroxide solution with the mass percent concentration being 30% and a Pasteur sporosarcina strain. The invention further provides the preparation method of the biological admixture. The biological admixture has good healing performance for concrete microcracks, accordingly, the durability of concrete engineering is improved, and construction costs are saved. The biological admixture is especially applicable to concrete structures with high requirements for mechanical strength, such as roads, bridges and other major engineering.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a concrete crack repairing agent, in particular to a biological admixture for concrete micro-crack self-healing. The invention also relates to a preparation method of the biological admixture for the self-healing of concrete micro-cracks. Background technique [0002] The commonly used concrete crack repair agents on the market mainly include epoxy resin, urethane, acrylamide polymer, asphalt and silicate mortar. Most of them belong to organic substances, while concrete is inorganic substances, so the compatibility between the two is poor, and it only plays the role of filling cracks, and does not improve the mechanical properties of cracked concrete much. Portland mortar and concrete are both inorganic components, and the compatibility between the two is good, which can make up for the loss of concrete strength caused by cracks to a certain extent. However, for some small cracks, the ab...

AI Technical Summary

Problems solved by technology

[0004] The above technologies have not given specific guidance on how to make the admixture for self-healing of concrete micro-cracks have good healing properties so as to improve the durability of concrete engineering

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