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.