Ultra-high performance concrete mixed with hybrid fibers

Abstract

The invention belongs to the technical field of building materials, and particularly relates to ultra-high performance concrete mixed with hybrid fibers. The concrete is prepared from ordinary Portland cement, silica fume, floating bead fly ash, slag powder, HP-CSA, quartz sand, limonite ore, titanium alloy sand, water reducing agent, defoaming agent, steel fiber, basalt fiber, cellulosic fiber and water. The ultra-high performance concrete mixed with the hybrid fibers has the advantages that the problems that the water-binder ratio is low, the usage amount of cementing material is large, andthe incorporation of the high-performance water reducing agent increases the shrinkage of the concrete can be solved, the constraint problem caused by the shrinkage on the application of the ultra-high performance concrete fabricated precast unit can be overcome, and the toughness of products is drastically improved. The ultra-high performance concrete mixed with the hybrid fibers is applicable tovarious concrete projects with special structures such as long span and super high-rise, and is suitable for various types of fabricated buildings.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to ultra-high performance concrete mixed with mixed fibers. Background technique [0002] With the development of technology, special structures such as long-span and super high-rise have put forward more and more stringent requirements for concrete. However, traditional concrete has been unable to meet people's needs due to its shortcomings such as heavy weight, low tensile strength, and insufficient durability. . Ultra-high performance concrete is characterized by a high content of cementitious components and a low water-binder ratio, and usually exhibits high mechanical properties and ductility. In addition, it has high toughness and excellent durability, so it has attracted the attention of the material industry and engineers soon after it came out. [0003] Ultra-high performance concrete is a kind of composition material with optimal particle gradation...

AI Technical Summary

Problems solved by technology

Although these measures have improved the mechanical properties of ultra-high performance concrete, the low water-binder ratio, the large amount of cementitious materials, and the addition of high-performance water reducing agents have increased the shrinkage of concrete, resulting in the generation of internal microcracks.

However, microcracks will greatly reduce the durability of concrete, greatly shorten its service life, and even cause serious engineering accidents, which restrict the application and development of ultra-high performance concrete.

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