Seawater coral sand ultra-high performance concrete and preparation method thereof

Abstract

The invention discloses seawater coral sand ultra-high performance concrete, and belongs to the technical field of building materials. The seawater coral sand ultra-high performance concrete comprisesthe following components in parts by weight: 900-1100 parts of coral sand, 700-900 parts of cement, 100-270 parts of silica fume, 75-120 parts of modified metakaolin, 78-312 parts of steel fibers, 200-300 parts of water, 5-20 parts of a water reducing agent, and 1-2 parts of an defoaming agent. According to the concrete, coral sand is adopted to replace quartz sand to serve as an aggregate, by means of the water absorption and water return characteristics of the coral sand, the internal curing effect can be achieved in the concrete, self-shrinkage of seawater coral sand ultra-high performanceconcrete can be improved, corrosion of chloride ions in the ocean to concrete steel can be prevented by adopting modified metakaolin, and the durability of the concrete is further improved; stainlesssteel fibers are adopted to replace common steel fibers, the compressive strength and breaking strength of the concrete are improved, and the water reducing agent and the defoaming agent are adopted,so that the concrete has good workability and compactness. The proportion is reasonable and scientific, and the prepared seawater coral sand ultra-high performance concrete has the characteristics ofgood workability, high strength, low shrinkage and high durability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a seawater coral sand ultra-high performance concrete and a preparation method thereof. Background technique [0002] The development of my country's marine economy and the protection of marine rights and interests have increased the demand for offshore island and reef engineering construction. At the same time, because island and reef buildings are easily eroded by the surrounding environment and maintenance is inconvenient, higher requirements are put forward for the mechanical properties and durability of concrete. . [0003] Ultra-high performance concrete is a fiber-reinforced cement-based composite material with ultra-high mechanical properties and ultra-long durability. Its mechanical properties develop rapidly. It can maintain the integrity of the concrete system when used to repair and strengthen concrete structures. Compared with organic polymers, it can redu...

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Problems solved by technology

[0005] In view of the deficiencies or defects in the above-mentioned prior art, the purpose of the present invention is to provide a seawater coral sand ultra-high performance concrete and its preparation method, which can effectively solve the poor workability and low strength of concrete existing in the existing coral concrete preparation technology and other problems, as well as the problems of large shrinkage of ultra-high performance concrete, easy corrosion of ordinary steel fibers and complicated manufacturing process