Ultrahigh-strength and high-performance fiber concrete with C170 strength grade and preparation method thereof

Abstract

The invention discloses ultrahigh-strength and high-performance fiber concrete with a C170 strength grade and a preparation method thereof. The concrete is prepared from the following components in parts by mass: 497 parts of cement, 74 parts of water, 1000 parts of crushed stones, 760 parts of fine aggregate, 80 parts of fly ash, 75 parts of rich husk ash, 111 parts of silicon ash, 14.4 parts of a water reducing agent, 10 parts of an exciting agent, 1.6 parts of cellulose fibers, 41 parts of a hydroxyl-modified carbon nanotube dispersion solution, 42 parts of a graphene oxide dispersion solution and 2.6 parts of a de-foaming agent. The concrete prepared by the preparation method has relatively high toughness and excellent durability and has relatively high bonding strength with section steel; the compression strength reaches 175.91MPa, the flexural strength reaches 35.76MPa, the splitting tensile strength reaches 15.26MPa, the bonding strength with the section steel reaches 7.49MPa and a chloride ion anti-leakage grade reaches a grade VI. The ultrahigh-strength and high-performance fiber concrete is used in a section steel concrete composite structure and can effectively express cooperative work performance between the section steel and the concrete; the disadvantages that the bonding performance of the section steel and the concrete is poor and respective mechanical properties of the section steel and the concrete cannot be sufficiently expressed are 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 C170 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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