A kind of high-performance fiber concrete of C90 strength grade and preparation method thereof

Abstract

The invention discloses a high-performance fiber concrete of C90 strength grade and a preparation method thereof. The mass parts of the concrete are as follows: 385-410 parts of cement, 120-135 parts of water, 700-720 parts of river sand, and 1020 parts of gravel ‑1050 parts, 85‑105 parts of fly ash, 45‑75 parts of rice husk ash, 7‑8 parts of water reducing agent, 11‑13 parts of activator, 1.1‑1.8 parts of cellulose fiber, 28 parts of carboxylated styrene-butadiene polymer 30 parts, 14-16 parts of hydroxyl-modified carbon nanotube dispersion, 2.0-2.1 parts of defoamer. The prepared concrete has high toughness and excellent durability, and has a high bond strength with the section steel. Its 28d cubic compressive strength is not less than 93.28MPa, its splitting tensile strength is not less than 8.37MPa, and its flexural strength is not less than 21.19MPa, the bonding strength with the steel is not less than 4.59MPa, 28d unsteady chloride ion migration coefficient D RCM Not greater than 46×10 ‑14 m 2 / s. 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 The invention belongs to the field of building materials, and is a high-strength, high-toughness and high-durability concrete mixed with rice husk ash, cellulose fiber, carboxylated styrene-butadiene polymer and modified carbon nanotubes, and specifically relates to a high-toughness concrete High-performance fiber concrete of C90 strength grade and a preparation method thereof. Background technique Ordinary concrete and cement-based materials have low tensile strength and poor toughness, and a large number of micro-cracks will occur during hardening or under external loads, which seriously affect the durability of concrete or cement-based composite structures and reduce the service life of structures. In order to overcome the brittleness of ordinary concrete and high-performance concrete, asbestos fibers, steel fibers, carbon fibers, polyvinyl alcohol fibers, polypropylene fibers, and basalt fibers with toughening effects are used in concrete. The use of a l...

AI Technical Summary

Problems solved by technology

The object of the present invention is to provide a kind of high-performance fiber concrete of C90 intensity grade and preparation method thereof, the present invention uses cellulose fiber, rice husk ash, modified carbon nanotube, carboxylated styrene butadiene polymer, cement, fly ash for the first time , river sand, gravel, chemical admixtures (including water reducer, activator, defoamer), and water have prepared a C90 strength grade with high volume stability, high toughness, high durability, and ultra-high strength. Fiber high-performance concrete overcomes the shortcomings of ordinary concrete such as high brittleness, easy cracking, and poor durability

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