A kind of ultra-high-strength high-performance fiber concrete of c190 strength grade and preparation method thereof

Abstract

The invention discloses an ultra-high-strength high-performance fiber concrete of C190 strength grade and a preparation method thereof. The mass parts of the concrete are as follows: 514 parts of cement, 68 parts of water, 990 parts of gravel, 780 parts of fine aggregate, powder 68 parts of coal ash, 75 parts of rice husk ash, 120 parts of silica fume, 15.4 parts of water reducer, 10 parts of activator, 1.7 parts of cellulose fiber, 45 parts of hydroxyl modified carbon nanotube dispersion, 46 parts of graphene oxide dispersion part, 2.7 parts of defoamer. The prepared concrete has high toughness and excellent durability, and has a high bond strength with the steel. The compressive strength reaches 195.19MPa, the flexural strength reaches 37.53MPa, and the splitting tensile strength reaches 16.62MPa. The bonding strength between them reaches 8.14MPa, and the chloride ion impermeability level reaches level VI. Used in steel-concrete composite structures, it can effectively exert the synergistic performance between steel and concrete, make up for the poor bonding performance of steel and concrete, and the inability to give full play to their respective mechanical properties.

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 C190 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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