Preparation technology for slag foamed concrete block

Abstract

The invention discloses a preparation technology for a slag foamed concrete block. The preparation technology comprises: (1) preparing a slag early strength agent; (2) preparing a slag cementing material; (3) preparing a compound admixture; (4) preparing foam of a foaming agent; (5) preparing a mixed slurry; (6) mixing the mixed slurry and the foam of the foaming agent according to a volume ratio of 1:6, followed by carrying out stirring to prepare a foamed slurry having a volume weight of 20-130 mm; (7) conveying the foamed slurry in a standing room, and supplying saturated vapor to the standing room, wherein a heating rate on the standing room is 5-8 DEG C per hour, followed by standing for 3-6 hours at a temperature of 55-60 DEG C, then conveying the stood foamed slurry in a autoclave, wherein steam pressure in the autoclave is increased to 0.8-1.2 Mpa in 2-3 hours, then remaining a constant temperature for 4-6 hours, followed by decreasing the steam pressure to zero in 2-2.5 hours to prepare the finished product. Each technical index of the solid slag autoclaved foamed concrete block provided by the present invention is superior to or accords with standard requirements of JC/T1062-2007 foamed concrete block.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a waste slag foam concrete brick. Background technique [0002] In the prior art, the amount of cement in the foam concrete is 61% to 85%. In order to solve the technical problem of foam concrete collapse after pouring, early-strength high-grade cement is often used, which leads to increased production costs. At the same time, the production technology of foam concrete bricks is backward, and there is no large-scale industrial production technology so far. The quality of the products is unstable and the compressive strength cannot meet the needs of modern building development. In addition, the foamed concrete product itself has a large drying shrinkage, is prone to strength cracks, is not resistant to water, and is afraid of freezing and thawing, which affects the promotion and large-scale application of the foamed concrete product. Contents of the invention [0003] The purp...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the amount of cement in the foam concrete is 61% to 85%. In order to solve the technical problem of the collapse of the foam concrete after pouring, early-strength high-grade cement is often used, which leads to an increase in production costs

At the same time, the production process of foam concrete bricks is backward, and there is no large-scale industrial production process so far. The quality of the produced products is unstable and the compressive strength cannot meet the needs of modern building development.

In addition, the foamed concrete products themselves have a large drying shrinkage, are prone to strength cracks, are not resistant to water, and are afraid of freezing and thawing, which affects the promotion and large-scale application of foamed concrete products.