Steel-fiber ultrahigh-strength self-compacting concrete

Abstract

The invention discloses steel-fiber ultrahigh-strength self-compacting concrete, which comprises the following components in parts by weight: 100 parts of gelled material, 107-133 parts of crushed limestone with the grain diameter being 5-20mm, 100-114 parts of medium sand, 22-23 parts of water and 1.5-2.5 parts of high-efficiency water-reducing agent, wherein the gelled material comprises 5-10 parts of siliceous dust, 17-25 parts of S95-grade slag powder and 65-78 parts of ordinary silicate cement; and the steel-fiber ultrahigh-strength self-compacting concrete also comprises steel fibers with the volume content accounting for 0.3-0.9 percent of the total volume of the concrete. The steel-fiber ultrahigh-strength self-compacting concrete disclosed by the invention is the perfect combination of ultrahigh-strength concrete, fiber concrete and self-compacting concrete, the technical blank of the ultrahigh-strength self-compacting concrete is filled, and a positive promoting action is performed for the design and the construction technology development of new materials and novel structures in the field of civil engineering.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a steel fiber super high-strength self-compacting concrete. Background technique [0002] With the development of modern construction engineering, the performance requirements of concrete are getting higher and higher. High-strength and ultra-high-strength concrete have greatly improved the mechanical properties and durability of concrete. However, with the continuous improvement of the strength level of concrete, some problems have also been exposed. The most prominent problem is that the higher the strength of the concrete, the greater the brittleness of the material, and even burst damage occurs in ultra-high-strength concrete. In order to overcome this shortcoming, an effective way is to add fibers to increase its toughness; at the same time, in actual construction, in order to reduce the noise during concrete pouring, improve construction speed and quality, and solve vibra...

AI Technical Summary

Problems solved by technology

[0003] However, for high-strength concrete that needs to overcome brittleness and add steel fibers, it is currently difficult to achieve self-compacting performance requirements in engineering

Now the steel fiber self-compacting concrete with strength grade CF60 has been successfully applied in actual engineering. Polypropylene fiber and alkali-resistant glass fiber can also be used to prepare fiber self-compacting concrete with strength grade below CF80, but the strength exceeds CF80 and meets self-compacting requirements. Concrete with performance requirements is still a blank in domestic technology