Coarse-aggregate-containing C240-strength-grade ultrahigh-performance fiber concrete and preparation method

Abstract

The invention discloses coarse-aggregate-containing C240-strength-grade ultrahigh-performance fiber concrete and a preparation method. The concrete is composed of, by mass, 578 parts of cement, 62 parts of water, 880 parts of rubble, 800 parts of fine aggregate, 70 parts of coal ash, 60 parts of rice husk ash, 154 parts of silicon ash, 16.5 parts of water reducer, 11.5 parts of excitant, 1.7 parts of cellulosic fiber, 90 parts of steel fiber, 51 parts of hydroxyl modified carbon nanotube dispersion, 54 parts of oxidized graphene dispersion and 2.9 parts of defoamer. The concrete prepared by the method has high toughness and durability and has high binding strength with section steel, compressive strength reaches 249.65MPa, bending strength reaches 50.88MPa, splitting tensile strength reaches 24.78MPa, the binding strength with the section steel reaches 10.54MPa, and chlorion anti-permeation grade reaches VI grade. When the concrete is used in a section steel and concrete combined structure, cooperative working performance between the section steel and the concrete can be brought into play effectively, and the defects that the section steel and the concrete are poor in binding performance and respective mechanical performance of the section steel and the concrete cannot be brought into full play are made up.

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 C240 ​​strength grade 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 be generated during hardening or under external loads, making Cl - , SO 4 2- and other harmful ions and CO 2 Harmful gases such as gas 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 s...

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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