贝壳基生态水泥熟料性能的研究

Study on Property of Shell-based Ecological Cement Clinker

以贝壳、粘土、粉煤灰、铁粉为原料,制备黑色致密状贝壳基生态水泥熟料。借助XRD、SEM、物理检测等方法对熟料性能、水泥物理性能和水化性能进行了分析。试验表明:煅烧温度1350℃,保温时间20 min,制备的水泥各项性能指标符合GB175-2007通用硅酸盐水泥规定。熟料主要矿物A矿、B矿、C3A、C4AF和少量的C11A7.CaCl2。水化产物为AFt、C-S-H凝胶、Ca(OH)2晶体。研究证实贝壳在低温快烧条件下生产52.5级硅酸盐水泥是可行的。

The shell-based ecological cement clinker was prepared by sea shells, clay and fly ash and iron powder, and then the performance of the Black and compact clinker and the physical and hydration properties of the cement were studied by XRD, SEM and physical examination. The results show that each index of the cement conforms to China standard GB175-2007 ＂ Common Portland Cement＂, prepared at 1350 ℃ for 20 rain. There are alite, belite, C3A and C4AF and a small quantity of C12A7 · CaCl2 in the clinker. The skeleton of the structure of the cement stone is constituted mainly by AFt, with C-S-H gel filling the pores and Ca（OH） 2 crystal included. The work confirms that it is feasible to prepare P. O52.5 portland cement by sea shell during fast firing at low temperature.