Novel fiber-reinforced alkali-activated slag concrete material and preparation method thereof

Abstract

The invention discloses a fiber-reinforced alkali-activated slag concrete material and a preparation method thereof. The concrete material is composed of slag, sodium hydroxide, water glass, sand, gravel, coal gangue, water, a water reducer and basalt fibers. The concrete material is prepared from the following components in parts by mass: 414 parts of slag, 29 parts of sodium hydroxide, 138 partsof water glass, 515 parts of sand, 717 parts of broken stone, 239 parts of coal gangue, 166 parts of water, 8 parts of a water reducer and 13.3 parts of basalt fibers. The basalt fibers are well bonded with a concrete matrix, and the tensile strength and the crack resistance of the concrete material are remarkably improved and are higher than those of common concrete. The fibers can reduce concrete shrinkage and inhibit crack development in the concrete, when the concrete is subjected to external load, the load can be uniformly transferred, the internal stress concentration is avoided, the destroy on concrete is prevented, and the overall strength of the concrete can be greatly improved.

Description

technical field [0001] The invention belongs to the field of concrete building materials, and in particular relates to a novel fiber-reinforced alkali-excited slag concrete material and a preparation method thereof. Background technique [0002] Alkali-activated slag concrete, as a green and environmentally friendly material, can reduce the CO2 released due to the production of cement. Slag is a waste produced in the ironmaking process, but due to its own nature, its potential activity can be stimulated by alkali. As a bulk solid waste, coal gangue accumulates to form gangue mountains, which will pollute the land, air and water. It is a beneficial attempt to add coal gangue as aggregate into alkali-excited slag concrete, which can utilize a large amount of solid waste. The splitting tensile strength and flexural strength are low, so it is necessary to improve the mechanical properties of alkali-excited slag concrete by incorporating fibers. SUMMARY OF THE INVENTION [0...

AI Technical Summary

Problems solved by technology

It is a beneficial attempt to mix coal gangue into alkali-activated slag concrete as an aggregate, which can utilize a large amount of solid waste; but after coal gangue is mixed with alkali-activated slag concrete, it will reduce the strength of concrete, and at the same time, due to the alkali-activated slag concrete The splitting tensile strength and flexural strength of slag concrete are low, so it is necessary to improve the mechanical properties of alkali activated slag concrete by adding fibers

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