High-toughness cement-based composite material and preparation method thereof

Abstract

The invention relates to a high-toughness cement-based composite material and a preparation method thereof. The high-toughness cement-based composite material comprises cement, fly ash, fine sand, water, a water reducing agent, a thickening agent, PE fibers and steel fibers. The preparation method comprises the following steps: 1, dry mixing and dispersion of PE fibers, 2, dry mixing and dispersion of a cement-based material, 3, addition of a water reducing agent, 4, addition of a thickening agent, 5, addition of steel fibers, 6, preparation of the high-toughness cement-based composite material, 7, a tensile test on the high-toughness cement-based composite material by using a displacement meter clamp, and 8, an axis tensile test on the high-toughness cement-based composite material by using a test fixture. The compressive strength of the high-toughness cement-based composite material ranges from 45 Mpa to 50 Mpa, the ultimate tensile strain reaches 5%, the tensile cracking strength is4Mpa, the ultimate tensile strength is 5Mpa, the number of cracks in the 80-mm tested section of the dumbbell-shaped standard tensile test piece is about 30, and the high-toughness cement-based composite material is a building material with high ductility and high tensile property.

Description

technical field [0001] The invention relates to building materials, in particular to a high-toughness cement-based composite material and a preparation method thereof. Background technique [0002] Since the birth of Portland cement in the 19th century, the performance and application of concrete have developed by leaps and bounds. In today's society, concrete has become the most important building material. In the wide application of concrete, the "golden partner" of steel bar and concrete has to be mentioned. Steel bar shows good ductility while concrete shows good compressive capacity. , but very weak in tensile strength. In the "Code for Seismic Design of Buildings", it is pointed out that the elongation of steel bars should not be less than 9%, and the strain is generally 0.02% for concrete which is a brittle material, which means that reinforced concrete is prone to cracks in the working environment under tension. Work with cracks is also the normal state of reinforc...

AI Technical Summary

Problems solved by technology

[0004] However, the existing fixtures have heavy weight, complicated operation, high cost and low applicability, so it is necessary to design a new displacement gauge fixture to solve the above problems

[0005] However, the existing fixture has complex structure and inconvenient clamping, so it is necessary to design a new type of test fixture to solve the problem of large tension eccentricity in the stress process

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