Ultra-high performance cement-based material applied to wet spraying construction

Abstract

The invention discloses an ultra-high performance cement-based material applied to wet spraying construction. The ultra-high performance cement-based material comprises the following ingredients in parts by weight: 300-400 parts of cement, 50-100 parts of fly ash floating beads, 50-100 parts of silica fume, 40-70 parts of superfine limestone powder, 5-15 parts of a surfactant, 30-50 parts of a magnesium expanding agent, 300-400 parts of quartz sand, 100-200 parts of coral reef sand, 30-70 parts of microfilament steel fibers, 3-6 parts of ultra-high molecular weight polyethylene fibers, 1-5 parts of a mineral additive, 90-120 parts of mixing water, and 25-45 parts of a setting accelerator; wherein the surfactant is a naphthalene series or aliphatic series organic powder, the mineral additive is attapulgite gel powder with the average particle size of 5-15 microns, and the setting accelerator is an alkali-free accelerating agent with the total alkali content not larger than 1%, and the main components are aluminum sulfate and an organic amine. The ultra-high performance cement-based material can realize continuous wet spraying construction, and the mechanical property and durabilityof sprayed concrete are greatly improved. The ultra-high performance cement-based material can be widely applied to the field of cement-based material preparation.

Description

technical field [0001] The invention relates to the field of cement-based material preparation. More specifically, the present invention relates to an ultra-high performance cementitious material for wet spraying applications. Background technique [0002] In recent years, on the one hand, my country's large-scale infrastructure construction projects are increasing, which puts forward high requirements for the durability of concrete; on the other hand, as a large number of buildings in my country enter the aging period, a large number of buildings need to be renovated, repaired, Concrete has been paid more and more attention as a reinforcement and repair material. However, at present, shotcrete has problems such as low strength in the later stage, relatively poor toughness, large drying shrinkage in the later stage, easy cracking, and insufficient durability and environmental adaptability. Ultra-high performance concrete refers to a new type of cement-based engineering mate...

AI Technical Summary

Problems solved by technology

However, at present, shotcrete has problems such as low strength in the later stage, relatively poor toughness, large drying shrinkage in the later stage, easy cracking, and insufficient durability and environmental adaptability.

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