Ultrahigh-strength basalt fiber composite concrete and preparation method thereof

Abstract

The invention discloses ultrahigh-strength basalt fiber composite concrete and a preparation method thereof. The ultrahigh-strength basalt fiber composite concrete comprises cement, fine aggregate, coarse aggregate, fly ash, a silica powder, an expansion agent, a defoamer, water, a water reducer and fiber as raw materials according to a mixture ratio of 482.6 to 831 to 1046 to 111.6 to 86 to 39 to1.1 to 100 to 19.7 to 9.5, and the unit of the mixture ratio is kg / m<3>; the fiber comprises basalt fiber and carbon fiber according to a volume ratio of 0.4 to 1. The ultrahigh-strength basalt fibercomposite concrete has the advantages of capability of significantly improving the bonding performance between sectional steel and concrete, effective exertion of the mechanical properties of the steel and the concrete and great improvement on the bearing capacity and the durability of an SRC (Steel Reinforced Concrete) structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to an ultra-high-strength basalt fiber composite concrete and a preparation method thereof. Background technique [0002] With the continuous development of the construction industry, steel-concrete composite structures (SRC for short) have been more and more widely used in long-span, heavy-duty structures, underground, offshore engineering, high-rise and super high-rise buildings. The bonding effect between steel and concrete in SRC structure is an important basis to ensure the coordinated work of steel and concrete. Only when steel and concrete work together to resist various effects can the advantages of this structure be fully utilized. [0003] Ultra-high-strength concrete with a design strength grade of C150 or higher has been gradually used in SRC structures, but there are two major problems in use: First, such high-compressive-strength concrete has high brittleness,...

AI Technical Summary

Problems solved by technology

[0003] Ultra-high-strength concrete with a design strength grade of C150 or higher has been gradually used in SRC structures, but there are two major problems in use: First, such high-compressive-strength concrete has high brittleness, low toughness, and poor fire resistance. ; The second is the problem of poor natural bonding performance between steel and ultra-high-strength high-performance concrete

Therefore, it cannot meet the development requirements of the trend of super-high, super-large span, super-durable, heavy-duty and new-style structures in engineering.

In addition, the preparation technology for super-ultra-high strength and super-durability of concrete has been mature, but these technologies have not been able to solve the problem of poor bonding performance between SRC structural steel and ultra-high-strength concrete.

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