Composite flyash-gypsum block (brick) and its production process

Abstract

The composite flyash-gypsum block (brick) is produced with building gypsum powder 30-40 wt%, flyash 30-40 wt%, lime 10-14 wt%, perlite 13-18 wt%, gypsum water reducing agent 0.6-1.4 wt% and flyash activator 0.8-1.2 wt% and through the following processes: mixing the mixture of ground lime and flyash with water solution of gypsum water reducing agent and flyash activator; adding gypsum powder and alkali resisting glass fiber or produce slurry through stirring; molding the slurry inside mold through vibration to produce block or brick; demolding and curing to obtain product with water content less than 5 %. The composite block or brick of the present invention has high softening coefficient, simple production process and low cost and may be used in moist environment.

Description

(1) Technical field [0001] The invention relates to the field of building materials, in particular to a fly ash gypsum composite building block (brick) and a production method thereof. (2) Background technology [0002] At present, there are many domestic manufacturers producing gypsum blocks, and the production methods are basically the same, that is, gypsum powder is used as the main raw material, together with fly ash and other fillers and foaming agents, it is crushed, batched, stirred, molded, formed, and demoulded. , maintenance and other processes (as described in the "Hollow Gypsum Blocks" and "Gypsum Blocks" sections in "New Wall Materials Handbook"). The main disadvantages of this technology are: (1) a large amount of gypsum needs to be used as raw material, the production cost is high, gypsum resources are wasted, and fly ash or industrial slag which is discarded and pollutes the environment cannot be used more; (2) this block Due to the low softening coefficient...

AI Technical Summary

Problems solved by technology

The main disadvantages of this technology are: (1) a large amount of gypsum needs to be used as raw material, the production cost is high, gypsum resources are wasted, and fly ash or industrial slag which is discarded and pollutes the environment cannot be used more; (2) this block Due to the low softening coefficient (less than 0.6), it cannot be used in a humid environment. If it is necessary to use it in a humid environment, it must be treated with moisture-proof treatment or the block must be steam-cured (the function of steam-cured is to improve the quality of fly ash. Activity), so although the use of fly ash can not reduce the cost, but increase it, affecting the enthusiasm of people to use fly ash

As for the use of fly ash and gypsum for bricks, there has not been heard of them yet.