Composite concrete containing mixed fibers and manufacturing method thereof

Abstract

The invention discloses composite concrete containing mixed fibers. The composite concrete comprises a cement composition and mixed fibers, wherein the cement composition is fixed with the mixed fibers; the mixed fibers comprise steel fibers, carbon fibers and polypropylene fibers; the shapes of the steel fibers are at least two selected from a group consisting of a long strip shape, a branch shape, a column shape, a polygon shape and a polyhedron shape, the surfaces of the steel fibers are covered with anti-corrosion layers, the anti-corrosion layers are epoxy resin anti-rust layers with thickness of 0.01-0.05 mm, and the surfaces of the steel fibers are uneven rough surfaces; the carbon fibers and the polypropylene fibers are cylindrical fibers, and the surfaces of the carbon fibers andthe polypropylene fibers are uneven rough surfaces; and a length-diameter ratio of the carbon fibers to the polypropylene fibers is 30-80, and the diameters of the carbon fibers and the polypropylenefibers are in a range of 0.01 to 0.02 mm. The concrete disclosed by the invention shows good in comprehensive performance, not only has the advantages of good erosion resistance and impermeability, but also is strong in tensile capacity, excellent in plastic shrinkage capacity, good in flexural capacity and long in service life.

Description

technical field [0001] The invention relates to the field of construction raw material technology and its production, in particular to concrete and its production method. Background technique [0002] Due to its unique properties, concrete materials have been widely used in construction, bridges, tunnels, ports and other fields. In order to cope with different working environments and resist different loads, it is often difficult to adapt to simply using traditional concrete. Therefore, the development and application of composite concrete with mixed fibers is on the agenda. Compared with traditional concrete, high-performance and multi-functional concrete has higher strength and durability, and various admixtures or fibers are mixed in the preparation process to achieve different functions, and can resist drought, high cold, high humidity, etc. High-performance and multi-functional concrete such as internally maintained high-strength concrete, phase-change temperature-cont...

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Problems solved by technology

The cubic compressive strength and flexural strength of steel fiber reinforced concrete increase with the increase of steel fiber content, and the crack resistance effect on concrete is obvious, but the restriction effect on concrete cracking is not obvious. The role of steel fiber in concrete It has a significant size effect; the surface of carbon fiber is rough, and it has a good physical combination with the cement matrix, so that the concrete shows good plastic deformation characteristics, and can significantly improve the elastic modulus of the concrete. Under a certain amount of fiber and aggregate, It can also achieve a certain degree of frost resistance, but its cost is relatively high; basalt fiber has a cost-effective advantage compared with carbon fiber, etc. It has high tensile strength, corrosion resistance, high temperature resistance, and good crack resistance. After chopping basalt fibers, the strength, crack resistance, compressive strength and flexural strength of concrete have been significantly improved, but the strength and flexural impact resistance of concrete will be affected when the fiber content reaches a certain range; although polypropylene fibers cannot improve The strength can prevent cracks and plastic shrinkage cracks caused by temperature changes at extremely low dosage, can effectively inhibit the damage caused by freezing and thawing, and can also reduce the early plastic shrinkage cracks of concrete and prevent their development, thereby improving its impermeability In theory, hybrid fibers refer to the mixing of fibers of different qualities or fibers of the same quality and different geometric forms, which not only improves the performance of a certain level of concrete, but improves the performance of concrete as a whole, but it is also possible to mix Improper proportion will reduce the performance of the final concrete

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