Medium-coarse aggregate high-toughness polyvinyl alcohol fiber-reinforced cement-based composite material

Abstract

The invention discloses a medium-coarse aggregate high-toughness polyvinyl alcohol fiber-reinforced cement-based composite material comprising the components by the mass percentage: 20%-50% of cement, 10%-40% of fly ash, 10%-50% of quartz sand, 0%-20% of broken stones, 10%-35% of water, 0%-5% of a water reducing agent, 1-3% of polyvinyl alcohol fiber, 0%-5% of silica fume, and 0%-1% of a thickening agent. The material has the advantages of high strength, good binding properties with coarse aggregate concrete, easily available raw materials, lower cost, high toughness, multi-point cracking, and hairline cracks. The material is applicable to repairing and reinforcement of road surfaces of old cement roads and bridge deck slabs, expansion and contraction joints and beam bottom cracks of old bridges.

Description

technical field [0001] The invention relates to a fiber-reinforced cement-based composite material, especially a high-toughness cement-based composite material, and belongs to the technical field of building materials and construction. Background technique [0002] China's highway and bridge engineering construction has developed rapidly and vigorously in the past two decades. A large number of bridges are accompanied by various diseases during use. Among them, the concrete used for bridges is mainly reflected in the corrosion of steel bars caused by concrete cracking, the reduction of bridge bearing capacity, and the protective layer. Pockmarked surface, peeling affect the appearance and so on. At present, in the repair and reinforcement of the pavement of old cement roads and bridge decks, expansion joints, and beam bottom cracks of old bridges, it is usually carried out by pouring concrete or plastering the surface with cement mortar. [0003] Commonly used concrete surf...

AI Technical Summary

Problems solved by technology

[0004] Their disadvantages are: 1) Concrete or cement mortar is easy to crack, and has poor anti-cracking, anti-penetration, anti-freezing and thawing capabilities, which affects the durability and safety of bridges during use.

2) When the traditional low-toughness fiber concrete is used in the repair and reinforcement of roads and bridges, there are problems of insufficient toughness, excessive crack width, and insufficient anti-seepage and corrosion resistance.

3) In the patent document with the publication number CN 101665342A, a high-toughness crack control and anti-seepage fiber concrete is disclosed, but this technology has poor workability with coarse aggregate old concrete, high production cost and insufficient strength in the later stage The problem

4) In the patent document with the publication number CN 101891417A, a strong and tough polypropylene fiber reinforced cement-based composite material is disclosed, but this technology has extremely strict requirements on the variety of polypropylene fiber, and at the same time it works with coarse aggregate old concrete poor performance

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