Autoclaved sand-lime brick and producing method thereof

Abstract

The invention relates to a method for preparing a steaming-pressure sand lime brick. The steaming-pressure sand lime brick is characterized in that the steaming-pressure sand lime brick is prepared from the following materials in weight percentage: 88 to 90 percent of quartz sand and 10 to 12 percent of calcined lime. The key points of the preparation method include: the fineness of the ground calcined lime is less than 0.09mm; the size distribution of the quartz sand particle is as follows: 10 to 20 percent of quartz sand with the particle diameter of between 1.2 and 2.4mm, 60 to 70 percent of quartz sand with the particle diameter of between 0.14 and 1.2mm, and 20 to 30 percent of quartz sand with the particle diameter of less than 0.12mm; the high-temperature high-pressure process comprises three stages of heating-up, constant temperature and cooling down; the heating-up time is controlled to be between 2 and 2.5 hours, and the heating-up temperature is 200 DEG C; the constant temperature time is controlled to be between 4 and 5 hours, and the constant temperature is controlled to be between 190 and 200 DEG C; the cooling down time is controlled to be between 2 and 2.5 hours; and at the constant temperature stage, the steam pressure is controlled to be between 1.3 and 1.6MPa. The method resolves the problems of big separation degree and expansion coefficient existing in the prior steaming-pressure sand lime brick.

Description

technical field [0001] The invention relates to a production method of an autoclaved lime-sand brick. Background technique [0002] Autoclaved lime-sand brick is a dense silicate concrete product, the main raw materials are lime and sand. It is made by measuring, stirring and digesting the finely ground quicklime and sand, forming under pressure and curing under autoclave. At present, in addition to a small number of imported equipment enterprises in China that can produce lime-sand hollow bricks, most of them are lime-sand solid bricks, and the variety of designs and colors is relatively single. According to the analysis of foreign experience, lime-sand hollow brick products and colored lime-sand bricks will be the development of autoclaved lime-sand bricks. direction. [0003] The authorized announcement number is CN1172065C, and the authorized announcement date is a Chinese invention patent on October 20, 2004, which discloses a production method of steam-cured lime-san...

AI Technical Summary

Problems solved by technology

[0018] The problem of steam-cured lime-sand bricks is that, due to the lack of high-temperature and high-pressure chemical reactions, the strength is unstable, the dispersion is large, and the expansion coefficient of bricks is large. The walls of buildings using steam-cured lime-sand bricks are easy to crack.