C230-strength-grade ultrahigh-performance fiber reinforced concrete containing coarse aggregates and preparation method of C230-strength-grade ultrahigh-performance fiber reinforced concrete

Abstract

The invention discloses C230-strength-grade ultrahigh-performance fiber reinforced concrete containing coarse aggregates and a preparation method of the C230-strength-grade ultrahigh-performance fiber reinforced concrete. The concrete comprises the following components in parts by mass: 560 parts of cement, 64 parts of water, 900 parts of detritus, 780 parts of fine aggregates, 75 parts of fly ash, 63 parts of rice hull ash, 145 parts of silica fume, 16 parts of water reducing agent, 11 parts of excitant, 1.7 parts of cellulosic fiber, 78 parts of steel fiber, 50 parts of hydroxyl modified carbon nanotube dispersion liquid, 52 parts of graphene oxide dispersion liquid and 2.9 parts of defoaming agent. The prepared concrete has relatively high toughness and durability and relatively high bonding strength with profile steel and has the compressive strength of 235.48MPa, the breaking strength of 48.23MPa and the split tensile strength of 22.95MPa, the bonding strength of the C230-strength-grade ultrahigh-performance fiber reinforced concrete and the profile steel reaches 9.24MPa, and the impermeability grade of chloride ions reaches the VI grade. When being used in a profile steel and concrete combined structure, the C230-strength-grade ultrahigh-performance fiber reinforced concrete containing coarse aggregates is capable of effectively exerting the cooperative working performance between the profile steel and the concrete and making up the defects that the bonding performance of the profile steel and the concrete is poor and the respective mechanical performances of the profile steel and the concrete cannot be sufficiently exerted.

Description

technical field [0001] The invention belongs to the field of new building materials, and is a high-strength, high-toughness and high-durability superhigh-strength building material containing coarse aggregate mixed with rice husk ash, cellulose fiber, steel fiber, modified carbon nanotube and graphene oxide. The performance concrete particularly relates to a C230 strength class ultra-high-performance fiber concrete containing coarse aggregate with high toughness and a preparation method thereof. Background technique [0002] Ordinary concrete and cement-based materials have low tensile strength and poor toughness, and a large number of microcracks will occur during hardening or under external loads, making Cl - , SO 4 2- and other harmful ions and CO 2 Harmful gases such as harmful gases invade the interior of the concrete, accelerate the erosion of the concrete structure, seriously affect the durability of the concrete or cement-based composite structure, and reduce the ...

AI Technical Summary

Problems solved by technology

[0005] In the existing research, the ultra-high performance concrete containing coarse aggregate is obviously brittle and has poor deformation resistance, which limits the application of this type of concrete in actual engineering. On the basis of performance, improve the strength of concrete and greatly improve the toughness of concrete, and prepare ultra-high performance fiber concrete with compressive strength above 200MPa, containing coarse aggregate, high toughness and ultra-high durability

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