A kind of anti-crack finish layer of cement concrete member and preparation method thereof

Abstract

The invention relates to an anti-crack finish layer of a cement concrete component and a preparation method thereof. The anti-crack finishing layer of the cement concrete member is composed of cement, metakaolin, silica fume, expansion agent, polyvinyl alcohol fiber, fine aggregate, coarse aggregate, admixture, reinforcing agent and water. Firstly, weigh each component material in order and mix for 3 minutes to 6 minutes to obtain the ready-mixed concrete for the facing layer. Then, according to the position and structure type of the facing layer of the component, three molding methods are provided: horizontal plane, elevation and pattern design. Finally, after the curing is completed, the Brush the fair-faced concrete protective agent on the surface to get the required finishing layer. The performance of the mixture of the facing layer is good, the mechanical properties of the concrete meet the requirements of the design strength grade, and the reinforcing agent can obviously improve the strength of the concrete. It can make concrete components meet the design requirements of high crack resistance, high-quality appearance and component decoration diversity without reducing their mechanical properties and durability, reduce construction costs, and have strong practicability.

Description

technical field [0001] The invention relates to the technical field of cement concrete products, in particular to a crack-resistant finish layer of a cement concrete component and a preparation method thereof. Background technique [0002] Compared with wood, steel, plastic and other building materials, cement concrete has the advantages of low raw material prices, wide sources, and easy construction. However, cement concrete also has shortcomings such as high brittleness and easy cracking. Once cracks occur, the structural performance will be greatly reduced. , Solving the crack problem of concrete is also one of the difficult problems in the engineering field. [0003] In concrete components such as prefabricated box girders and large pier columns, it is often required that the concrete surface has good crack resistance, and there are few defects such as holes, air bubbles, and honeycomb pockmarks, and high-quality appearance requirements such as uniform color. If the com...

AI Technical Summary

Problems solved by technology

If all the components are made of high-crack-resistant fair-faced concrete, the production and construction process will be complicated and expensive, and the current high-quality sand and gravel aggregates are in short supply, which will inevitably increase the difficulty of technical control and waste costs

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