Waterproof self-repairing building material and preparation method thereof

Abstract

The invention relates to a waterproof self-repairing building material and a preparation method thereof. The building material comprises the following raw materials in parts by weight: 4-6 parts of a self-repairing agent, 0.1-0.15 part of an initiator, 70-80 parts of Portland cement, 200-250 parts of sand and 30-35 parts of water, wherein the self-repairing agent is alkenyl acid salt and / or alkenyl amide containing a cross-linking agent. The building material disclosed by the invention has relatively high impermeability, can quickly and continuously repair small defects in a cement structure, prevents the expansion of the small defects, and prolongs the overall service life of the waterproof structure building material; the preparation method comprises the steps of uniformly mixing a self-repairing agent, an initiator and water to obtain a mixed solution; and uniformly mixing the obtained mixed solution with Portland cement and sand to obtain the building material. The preparation method is simple and does not need heating treatment, and the polymerization reaction of the high polymer material and the cement hydration hardening process are carried out together, so that the structures of the two can be closely linked.

Description

technical field [0001] The invention belongs to the field of concrete self-repair, in particular to a waterproof self-repair building material and a preparation method thereof. Background technique [0002] In the field of construction engineering, waterproof engineering failures often occur, resulting in water leakage in buildings and structures, which brings great inconvenience to people's daily work and life. Researchers have done a lot of research on this phenomenon. At present, the commonly used method is to apply a layer of permeable crystalline material near the leakage part of the mortar or concrete surface, and through the action of the water environment, the inorganic matter will penetrate into the surface of the mortar or concrete, and the calcium salt and hydroxide in the cement Substances such as calcium or silicate react to form solid crystals to seal the defects and gaps in them, thereby preventing water from flowing through and increasing the impermeable pre...

AI Technical Summary

Problems solved by technology

However, after the osmotic crystalline material is directly doped into the concrete or mortar system, it will react with the osmotic and crystalline active substances during the initial hydration of the cement. During this process, a large amount of osmotic and crystalline active substances will be consumed, resulting in The self-healing effect of concrete is not ideal

There are also researchers who wrap active substances with water-soluble polymers. When the cement is initially hydrated, the polymer film plays an isolation role, so that the active substances will not participate in the reaction. When water seepage begins to appear in the structure, through the action of water, Gradually dissolve the polymer film, let the active material flow out, and then repair the structural defects, but in practical applications, it is found that the polymer film is difficult to dissolve under the action of a small amount of water. If the thickness of the polymer film is reduced to a relatively When the level is low, the structure will be destroyed during the construction process, so the control of the thickness of the polymer film has become a major difficulty and the main bottleneck for the realization of this technology

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