Steam-cured alkali-activated slag concrete and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and relates to steam-cured alkali-activated slag concrete and a preparation method thereof. When the steam-cured alkali-activated slag concrete is applied to engineering in alpine regions, the steam curing time is shortened by 1-2 hours, so that the characteristics of high strength, good freezing resistance and high chloride ion erosion resistance can be utilized, the quality of components is improved, and the steam-cured alkali-activated slag concrete is adapted to extreme weather conditions; besides, the problems of long forming and curing time and long construction period can be solved, the component steam curing and mold removal time is shortened, the mold turnover rate is greatly increased, the construction period is shortened, and the adverse effect caused by construction in winter is relieved; meanwhile, 20-30% of fly ash is doped to replace slag, and the problem of shrinkage cracking of the alkali-activated concrete is effectively solved by adopting a steam curing system; in addition, cement is not used for preparing the concrete, so that energy consumption and carbon emission are greatly reduced, and energy conservation and environmental protection are achieved; and river sand is replaced with machine-made sand, so that the usage amount of natural resources is reduced, the production cost is saved, and the steam-cured alkali-activated slag concrete has important significance on healthy and sustainable development of the building industry.

Description

Technical field: [0001] The invention belongs to the technical field of building materials, and relates to a steam-cured alkali-activated slag concrete and a preparation method thereof, which are applied to construction projects in alpine regions. Background technique: [0002] Extreme environmental conditions in alpine regions: high altitude, low air pressure, low temperature and large temperature difference between day and night, which have many adverse effects on the maintenance of concrete, reduce the mechanical properties of concrete, and have a greater impact on concrete aged 28 days and above. At the same time, the durability will also be significantly reduced. Concrete in the alpine region for a long time in the early stage will be subjected to multiple freezes and thaws before hardening, resulting in internal defects, resulting in a decrease in concrete strength and durability. Moreover, due to the frequent snow and ice weather, the widely used deicing salt on the t...

AI Technical Summary

Problems solved by technology

However, the hydration products of alkali slag cement and ordinary Portland cement are different, and the slag concrete excited by water glass is prone to shrinkage and cracking, which brings great difficulties to engineering construction.

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