A kind of high-performance fiber concrete of C120 strength grade and preparation method thereof

Abstract

The invention discloses a high-performance fiber concrete of C120 strength grade and a preparation method thereof. The mass parts of the concrete are as follows: 440-460 parts of cement, 110-120 parts of water, 720-750 parts of river sand, and 1010 parts of gravel ‑1050 parts, 65‑100 parts of fly ash, 45‑65 parts of rice husk ash, 45‑65 parts of silica fume, 10‑12 parts of water reducing agent, 13‑14 parts of activator, 1.1‑1.8 parts of cellulose fiber, Hydroxyl-modified carbon nanotube dispersion liquid 24-26 parts, defoamer 2.2-2.4 parts. The prepared concrete has high toughness and excellent durability, and has a high bond strength with the section steel. Its flexural strength is not less than 27.19MPa, the 28d cubic compressive strength is not less than 122.07MPa, and the splitting tensile strength is not less than 10.82MPa, the bonding strength with the steel is not less than 5.24MPa, and the 28d unsteady chloride ion migration coefficient D RCM Not greater than 21×10 ‑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 [0001] The invention belongs to the field of new building materials. It is a high-strength, high-toughness and high-durability concrete mixed with rice husk ash, cellulose fiber and modified carbon nanotubes, and specifically relates to a high-toughness C120 strength grade high concrete Performance fiber concrete and its preparation method. Background technique [0002] Ordinary concrete and cement-based materials have low tensile strength and poor toughness. A large number of micro-cracks will occur during the hardening process or under external loads, which will seriously affect the durability of the concrete or cement-based composite structure and reduce the service life of the structure. 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, which have a toughening effect, are used in concrete with longer fibers. T...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of high-performance fiber concrete of C120 intensity grade and preparation method thereof, the present invention uses cellulose fiber, rice husk ash, modified carbon nanotube, cement, fly ash, river sand, crushed stone for the first time , chemical admixtures (including water reducer, activator, defoamer), and water prepared a fiber high performance concrete with high volume stability, high toughness, high durability, and ultra-high strength C120 strength level, overcoming It overcomes the shortcomings of ordinary concrete, such as high brittleness, easy cracking, and poor durability.

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