Rapid-hardening early strength concrete prepared from various industrial solid wastes, and preparation method thereof

Abstract

The invention belongs to the technical field of alkali-activated gelling materials, and relates to a rapid-hardening early strength concrete prepared from various industrial solid wastes, and a preparation method thereof. The rapid-hardening early strength concrete includes 35-45 parts of tailings and waste rocks, 30-40 parts of iron tailing sands, 4-10 parts of fly ash, 4-10 parts of granulated blast furnace slag micro-powder and 1-2 parts of steel slag micro-powder, and also contains 0.15-0.30% of sodium hydroxide, 3-6% of water glass, 0.4-0.6% of a set retarder, 0.05-0.10% of a water reducing agent and 4.5-5.5% of water. The large industrial solid wastes such as tailings and waste rocks, iron tailing sands, fly ash, granulated blast furnace slag micro-powder and steel slag micro-powderare fully utilized to obtain the rapid-hardening early strength concrete with excellent performances, so building materials with excellent performances can be prepared, the various solid wastes are consumed, and reuse of the solid wastes is achieved.

Description

technical field [0001] The invention belongs to the technical field of alkali-activated cementitious materials, and in particular relates to a rapid-hardening and early-strength concrete prepared by using various industrial solid wastes and a preparation method thereof. Background technique [0002] In 2017, the volume of bulk industrial solid waste generated in my country was about 3.656 billion tons, and its utilization was 1.716 billion tons, with a utilization rate of about 46.94%. The comprehensive utilization rate of tailings is 22.09%, the utilization rate of fly ash is 75%, the utilization rate of iron and steel slag is 76.05%, and the utilization rate of blast furnace slag is the highest, close to 100%. The utilization of bulk industrial solid waste in my country is mainly concentrated in the building materials industry, and the annual consumption of bulk industrial solid waste by cement, concrete and new wall materials accounts for about 70% of the total industrial...

AI Technical Summary

Problems solved by technology

[0004] At present, fly ash and granulated blast furnace slag powder are widely used as admixtures in cement and concrete, mainly because the addition of fly ash and granulated blast furnace slag powder can improve the performance of cement and concrete, and at the same time meet the national requirements Carbon and green environmental protection trends, but fly ash and granulated blast furnace slag powder are only used as admixtures in building materials, and have not been used with high added value / high dosage

At present, there are also many alkali-activated cementitious materials prepared by using fly ash and granulated blast furnace slag powder, but the biggest disadvantage of this type of material is that it is difficult to balance the workability, mechanical properties and shrinkage properties.

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