Ultrahigh strength high-performance fiber concrete at C160 strength grade and preparation method thereof

Abstract

The invention discloses an ultrahigh strength high-performance fiber concrete at C160 strength grade and a preparation method thereof. The concrete comprises the following components in parts by weight: 485 parts of cement, 82 parts of water, 1000 parts of macadam, 750 parts of fine aggregate, 70 parts of coal ash, 73 parts of rice hull ash, 102 parts of silica fume, 14.0 parts of water reducer, 9.5 parts of excitant, 1.6 parts of cellulosic fiber, 40 parts of hydroxy modified carbon nano tube dispersion liquid, 37 parts of graphene oxide dispersion liquid and 2.6 parts of de-foaming agent. The prepared concrete has higher toughness, durability, higher bonding strength with profile steel, compressive strength reaching up to 167.74MPa, breaking strength reaching up to 35.21MPa, splitting strength reaching up to 14.59MPa, bonding strength with profile steel reaching up to 7.54MPa and chloride penetration resistance grade at VI-grade. When the ultrahigh strength high-performance fiber concrete is applied to a profile steel concrete combined structure, the cooperative working property between the profile steel and the concrete is effectively exerted and the defects of poor bonding property of the profile steel and the concrete and incapability of fully utilizing the respective mechanical properties of the profile steel and the concrete can be overcome.

Description

technical field [0001] The invention belongs to the field of new building materials, and is a high-strength, high-toughness and high-durability concrete mixed with rice husk ash, cellulose fibers, modified carbon nanotubes and graphene oxide, and specifically relates to a C160 concrete with high toughness Ultra-high-strength high-performance fiber concrete of strength grade 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 service life of the structure. [0003] Carbon nanotube is a one-dimensional fiber material ...

AI Technical Summary

Problems solved by technology

However, due to the sp2 hybrid structure in the graphene plane, there is a strong molecular attraction between the nanoparticles, which causes mutual adsorption, causing the graphene to agglomerate together, unable to stably disperse in the polymer and play its role, and even cause the occurrence of defect

The oxidized graphene monolithic surface introduces a lot of oxygen-containing functional groups such as hydroxyl and carboxyl, so that it can be uniformly dispersed in water, but graphene oxide is prone to flocculation under alkaline conditions, which is very difficult for graphene oxide in cement. Dispersion is unfavorable and may even cause loss of concrete strength

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