Nano-modified ultrahigh-strength steel fiber concrete and preparation method thereof

Abstract

The invention discloses nano-modified ultrahigh-strength steel fiber concrete and a preparation method thereof, and relates to the technical field of building concrete. The concrete disclosed by the invention is prepared from the following components in parts by weight: 370 to 420 parts of Portland cement, 80 to 120 parts of mineral powder, 30 to 50 parts of fly ash microbeads, 30 to 60 parts of silica fume, 12 to 20 parts of a high-performance water reducing agent, 40 to 160 parts of steel fibers, 0.05 to 0.25 part of graphene oxide, 3 to 20 parts of nano silicon dioxide, 600 to 800 parts of sand, 900 to 1100 parts of stones and 110 to 130 parts of tap water. The nano-modified ultrahigh-strength steel fiber concrete provided by the invention contains the substances such as the steel fiber, the graphene oxide and the nano silicon dioxide, so that the interface microstructure of set cement and aggregate can be improved, and the mechanical property, the impermeability and the durability of the concrete can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of building concrete, in particular to a nano-modified ultra-high-strength steel fiber concrete and a preparation method thereof. Background technique [0002] The mechanical properties and durability of ultra-high-strength concrete are significantly higher than those of ordinary and high-strength concrete. When it is used in practical engineering, it has large bearing capacity, light structure weight, can reduce the cross-sectional area of ​​the structure, save space, and improve Significant advantages such as material utilization. However, as the strength of concrete increases, its brittleness becomes more obvious, especially for ultra-high-strength concrete, which has little strain softening performance under axial compression and shows sudden burst failure. [0003] Steel fiber is a metal fiber with high tensile strength and high modulus of elasticity. After adding steel fibers to ultra-high-strength c...

AI Technical Summary

Problems solved by technology

However, as the strength of concrete increases, its brittleness becomes more obvious, especially for ultra-high-strength concrete, which has little strain softening performance under axial compression, showing sudden burst failure

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