High-performance alkali-activated slag-based seawater coral aggregate concrete and preparation method thereof

Abstract

The invention provides high-performance alkali-activated slag-based seawater coral aggregate concrete and a preparation method thereof. The concrete is formed by mixing industrial waste residues, an alkali activator, fibers, coral reef sand, coral reef stones and seawater, wherein the industrial waste residues are formed by a mixture of slag, fly ash and silica fume. According to the invention, the coal ash and the silica fume in a certain ratio are doped to overcome the defects that an alkali-activated full-slag cementing material is short in setting time and large in shrinkage, and the strength characteristic of concrete cannot be affected; the fibers are doped to effectively improve the toughness and crack resistance of the coral aggregate concrete; and meanwhile, shrinkage of the alkali-activated slag cementing material can be relieved to a certain extent through the restraining effect of the fibers. The concrete is suitable for a marine environment, and the purposes of environmental protection, high strength and high durability are achieved.

Description

technical field [0001] The invention belongs to the technical field of marine construction engineering materials, and in particular relates to a high-performance alkali-activated slag-based seawater coral aggregate concrete and a preparation method thereof. Background technique [0002] Coral aggregate concrete is a new type of engineering material in marine engineering construction. It makes full use of seawater and abandoned coral reefs and other unique marine resources in island areas. It not only solves the shortage of traditional engineering materials on remote islands and reefs, but also saves engineering costs and reduces The construction period of the project is shortened, and it is suitable for high-temperature, high-humidity, high-salt, and windy marine environments. [0003] However, coral aggregate concrete has the following defects: 1) Due to the characteristics of coral aggregate, such as light porosity, low cylinder compressive strength, many internal defects,...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-performance alkali-activated slag-based seawater coral aggregate concrete and its preparation method. By adjusting the reasonable ratio of the raw material components of the cementitious material, the concrete has better strength without reducing its strength. work performance, and alleviate the problems of fast setting time and large shrinkage of traditional alkali-activated all-slag-based cementitious materials; then use the dense microstructure characteristics of alkali-activated cementitious materials to fill and improve the microscopic interface between slurry and aggregate, and then solve the traditional The problem of low strength and poor durability of coral aggregate concrete; the strength and toughness can be further enhanced by adding fibers

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