Crack-resistant waterproof cement-based permeable composite repairing material and method for preparing same

Abstract

The invention discloses a crack-resistant waterproof cement-based permeable composite repairing material and a method for preparing same. The crack-resistant waterproof cement-based permeable composite repairing material of the invention comprises the following components by the mass fraction: 20% to 40% of Portland cement clinker, 3% to 20% of fly ash, 2% to 10% of gypsum, 2% to 10% of high-alumina cement, 1% to 4% of sodium silicate, 0.1% to 1.5% of high-efficiency naphthalene-based water-reducing agent, 0.1% to 2.0% of sodium carbonate, 40% to 70% of shaping quartz sand, 0.1% to 3.0% of polypropylene staple fiber and 0.05% to 1.0% of sodium carboxymethyl cellulose. The high-performance material of the invention is free from toxicity and pollution, and further has the characteristics of solid cementation, good penetration depth, good waterproof, anti-permeability and crack-resistant effects and the like; and meanwhile, the invention has the advantages of low production cost, simple preparation process and construction method and wide applicable range.

Description

technical field [0001] The invention relates to a technology for preparing a cement-based permeable crack-resistant and waterproof composite repair material, in particular to a cement-based permeable crack-resistant and waterproof repair material with high anti-seepage and anti-crack performance and a preparation method thereof, belonging to the cement-based cement base for construction engineering The field of waterproof coating materials. Background technique [0002] In construction projects, the concrete structure will crack due to its high brittleness and changes in temperature and humidity, which cause its shrinkage and expansion, wet expansion and dry shrinkage, or uneven settlement, etc. And the corrosion of steel bars, etc., may eventually lead to the destruction of the concrete structure and cannot be used normally. This is a common problem in the construction industry, and it is also the main reason that affects the durability of concrete. [0003] The solution ...

AI Technical Summary

Problems solved by technology

At present, there are mainly three methods for surface waterproofing: the first is to use waterproofing coils or paints to form a waterproof film on the concrete surface to cover up cracks, and physical waterproofing cannot fundamentally solve the problem of waterproofing; The surface is painted with a layer of permeable hydrophobic paint, which can repel water in the cracks and on the surface to achieve the purpose of waterproofing, but it is still physically waterproof, which treats the symptoms but not the root cause. These materials are usually organic materials, aging resistance and durability. The thermal properties are low, and some products are not environmentally friendly; the third is a rigid waterproof material composited with cement-based and organic materials, which overcomes the shortcomings of the first two waterproof materials, and has a strong bond with the base surface concrete. Even when the base surface is wet or has water seepage, it can still be used for waterproofing the back surface and the wet base surface, and has incomparable performance with the first two materials

However, most of the current cement-based waterproof materials are surface-sealed waterproofing agents. The waterproof effect only acts on the surface and cannot penetrate into the structure automatically and deeply; the waterproof effect is not long-lasting, and there will be a continuous degradation process over time. Once waterproof The coating is damaged, and the waterproof ability is lost; and the alkali-aggregate reaction is caused due to the high alkali content of the waterproof material

[0004] Although there are few permeable crystalline cement-based waterproof materials, because they contain active chemical substances that can penetrate into the concrete through the carrier, so that the concrete is dense and waterproof, but they are expensive, and their bonding crack resistance is not good. it is good