最近保加利亚用烧粘土制得膨胀水泥.烧粘土的煅烧温度为830℃.先用烧粘土、消石灰和石膏制成膨胀剂.再用30%膨胀剂和70%普通水泥拌和均匀即得膨胀水泥.制得的水泥细度在0085号筛上筛余为8.67%;标准稠度35.3%;初凝:2小时9分钟;终凝:3小时 Recently, Bulgaria used expanded clay to make expanded cement. The calcined clay was calcined at a temperature of 830°C. It was first made of burnt clay, hydrated lime, and gypsum to form a bulking agent. The mixture was then mixed with 30% expansion agent and 70% ordinary cement to obtain expanded cement. The cement fineness obtained on the No. 0085 sieve is 8.67%; the standard consistency is 35.3%; the initial setting is 2 hours and 9 minutes; the final setting is 3 hours.