High-toughness concrete composition

Abstract

The invention discloses a high-toughness concrete composition. The high-toughness concrete composition comprises following raw materials, by weight, 300 to 500 parts of cement, 30 to 50 parts of phosphorous slag powder, 50 to 150 parts of fly ash, 1000 to 1100 parts of a coarse aggregate, 600 to 750 parts of a fine aggregate, 5 to 15 parts of a water reducer, 5 to 15 parts of mixed fiber, 10 parts of polyvinylpyrrolidone, and 130 to 180 parts of water. The high-toughness concrete composition possesses high toughness, excellent deformability, and relatively high tensile strength and bending strength, and is capable of improving integrity and seismic resistance of structures effectively, and ensuring impermeability and durability of the structures.

Description

technical field [0001] The invention relates to a concrete composition, in particular to a high-toughness concrete composition. Background technique [0002] Concrete is the most widely used building material. Its main components include cement, active mineral admixtures, aggregates and water. It has the advantages of wide source of raw materials, simple process, and good fire performance. And low bending strength, small deformation capacity, poor toughness, easy to crack and difficult to control the crack width after cracking. The low toughness of concrete may lead to sudden catastrophic failure due to stress concentration at variable cross-section positions and joints of steel / concrete hybrid structures. cracking, resulting in a significant reduction in the seismic performance of the structure. Under the current economic and technical level, people usually think that the cracking of concrete is almost inevitable. Cracks, especially harmful cracks are not only unsightly, ...

AI Technical Summary

Problems solved by technology

Commonly used polypropylene fiber concrete, the volume mixing ratio of polypropylene fiber is usually 0.05% ~ 0.2%, mainly used to improve the early crack resistance of concrete, but the strength of polypropylene fiber is low (usually 300 ~ 600MPa), elastic modulus Low (3 ~ 10GPa), the toughening effect on concrete is limited, there is no obvious enhancement effect on the bending and tensile strength, and it cannot provide enough bridging stress after cracks appear in the concrete, and the cracks will expand rapidly

Steel fiber has high tensile strength (380-1400MPa) and high elastic modulus (150-210GPa), so it can significantly improve the tensile and flexural strength of concrete, and the corresponding flexural toughness, impact resistance and Fatigue and other properties have also been significantly improved, but the deformation capacity has not been significantly improved, and its tensile strain capacity is in the order of 0.01% to 0.03%, and the material still cannot effectively control the crack width after cracking

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