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

A cement concrete and finishing layer technology, which is applied in the field of cement concrete products, can solve the problems of increasing the difficulty of technical control, complex production and construction technology, and waste of cost, so as to improve workability and surface decoration effects, reduce construction costs, and improve components. The effect of crack resistance

Active Publication Date: 2021-12-28
HUNAN CSCEC5B CONCRETE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1~6

[0036] In Examples 1-6, the cement adopts Conch brand P.O42.5 cement, and the apparent density is 3070 kg / m 3 , the 28d compressive strength is 48.4MPa; the silica fume is made of Sichuan Langtian encrypted silica fume, and the apparent density is 2180 kg / m 3 , SiO 2 Content 94%, specific surface area 15800m 2 / kg, 28d activity 115%; expansion agent is three-source HEA type, water reduction rate 13%, 21d limit expansion rate in air -0.02%; polyvinyl alcohol (PVA) fiber adopts Guangheng Chemical high-strength high-modulus fiber, fiber length 12 mm, elastic modulus 36GPa, elongation 8%, tensile strength 1600MPa; fine aggregate is Xiangtan quartz machine-made sand, fineness modulus 2.8; coarse aggregate is Loudi limestone gravel, particle size is 5-20mm, The crushing value is 8.5%; the water is tap water; the admixture is a high-performance polycarboxylic acid admixture from China Construction Western Construction New Material Technology Co., Ltd., and the formulas of each comp...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2201/50C04B2111/343C04B2111/00482C04B14/106C04B18/146C04B16/0641C04B14/28C04B24/02C04B24/125C04B2103/302C04B2103/50C04B14/06C04B2103/0068
Inventor 向佳瑜蒋震冷政王军李曦田青曾维
Owner HUNAN CSCEC5B CONCRETE
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