Method for preparing room-temperature curing one-component alkali-activated cement with calcination at low temperature

Abstract

The invention discloses a method for preparing room-temperature curing one-component alkali-activated cement with calcination at a low temperature. The method comprises the following main steps that raw materials with silicon and aluminum oxide and an alkali activator are uniformly mixed, and then the obtained mixture is calcined for 2-3hours at the temperature of 650-950 DEG C to obtain clinkers; the obtained clinkers are uniformly mixed with lime and plaster in proportion and are ground to residues on sieve with granularity of 200 meshes, the mass ratio of the residues on sieve is at most 10 percent, and cement powder is obtained; and the powder can be hardened at the room temperature after the powder is mixed with water. Through the method, the raw materials with the silicon and aluminum oxide are alkalified, and the one-component alkali-activated cement with enough strength can be prepared at the temperature much lower than the calcination temperature (1450 DEG C) of Portland cement clinkers. The method is simple, the raw materials are easily obtained, and the early-strength performance of the cement is good. The use convenience of the alkali-activated cement is obviously increased, the performance of the cement is further optimized, the preparation cost is reduced, and the development potential is provided.

Description

technical field [0001] The invention belongs to the field of new cement materials, and in particular relates to a low-temperature calcination preparation method of single-component alkali-activated cement maintained at normal temperature. Background technique [0002] In 2011, my country's cement output reached 2.063 billion tons, most of which were Portland cement. The calcination temperature of Portland cement reaches 1450°C, high energy and material consumption, high carbon emissions, serious environmental pollution, poor acid resistance, corrosion resistance and durability, and consumes a large amount of high-quality limestone resources, so its use should be gradually restricted and reduced. The alkali-activated cement that has been studied more recently is a two-component cement composed of an aqueous solution of a strong alkali salt and an active solid oxide powder, in which the typical component is Na 2 O-Ca(Mg)O-Al 2 o 3 -SiO 2 Alkali slag cement is the most cost...

AI Technical Summary

Problems solved by technology

However, the alkali-activated cement prepared by these patents needs to be cured at a temperature higher than room temperature to harden, which is inconvenient to use

Images