利用电石渣改性固硫灰制备胶凝材料的研究

基于固硫灰自身的火山灰活性和自硬性,提出用钙质激发剂激发固硫灰活性制备固硫灰基胶凝材料。实验研究表明在激发剂的作用下,掺入偏高岭土后胶凝材料强度提高80%以上。用内掺50%偏高岭土的固硫灰,采用电石渣或熟石灰复合水玻璃作为激发剂制备胶凝材料都在体系的碱含量为30%,水玻璃的模数为2.0,养护温度为60℃时强度达到最大,两种激发剂对强度的影响差异不大,而采用电石渣作为激发剂更节约成本,更具优势。

Preparation of circulating fluidized bed combustion fly ash-based cementitious materials with carbide slag

Based on the pozzolanic activity and self-hardening property of circulating fluidized bed combustion(CFBC) fly ash,this paper proposes to prepare CFBC fly ash-based cementitious materials by stimulating the CFBC fly ash with calcium activator.Experimental studies have shown that the strength of the cementitious materials mixed with metakaolin in the role of the activator increased by more than 80%.The cementitious material prepared with CFBC fly ash and 50% metakaolin and activated by carbide slag or lime mixed with water glass solution can achieve optimal strength on following conditions:alkali content was 30%,modulus of water glass was 2.0,and curing under 60 ℃.The two activators had no significant impact on the strength,while taking carbide slag as activator was more sensible than taking lime since it was industrial waste.