北京市亚新特种建材公司 (原窦点砖瓦厂 )已是4 7年的老厂 ,原料土已枯竭 ,老土塘剩下土的塑性指数偏低 ,在 7～ 8之间 ,采用原有设备 150挤泥机生产实心砖已属困难。根据北京市建委文件精神 ,自 1999年 7月 1日起将限制使用实心砖作为墙体材料。为此 ,北京市亚新特种建材公司 Beijing Yaxin Special Building Material Company (formerly sinus point brick and tile factory) is an old factory of 47 years. The raw material soil has dried up. The plasticity index of the remaining soil in the old earthen pond is low, between 7 and 8, and the original It is difficult to produce solid bricks with the equipment 150 mud squeezer. According to the spirit of the Beijing Municipal Construction Committee, the use of solid bricks as wall materials will be restricted from July 1, 1999. To this end, Beijing Yaxin Special Building Materials Company