粉煤灰-赤泥-钢渣微粉胶凝材料特性研究

Study on Characteristics of Fly Ash - Red Mud - Ultrafine Steel Slag Powder Cementing Material

摘要:

为解决水泥成本高、能耗污染大等问题，基于固废协同效应，以粉煤灰（FA）、赤泥（RM）、钢渣微粉（USS）为原材料，外掺水玻璃溶液为碱激发剂制备全固废胶凝材料（SWCM）。通过室内试验，以单因素极差法分析SWCM工作力学及水稳定性能变化规律，并利用XRD、SEM微观试验分析SWCM水化反应机理。试验结果表明：SWCM凝结时间、抗折抗压强度及水稳定性均在RM：USS=1：4时最佳，且工作力学性能可满足P.O42.5及以下硅酸盐水泥性能指标。SWCM生产成本仅为P.O42.5硅酸盐水泥的48.5%~55.4%。试件水化产物主要为水化硅铝酸钙（C-S-（A）-H）、钙矾石（AFt），当试件龄期增长、选择合适的RM及USS掺量可使试件中C-S-（A）-H、AFt数量增多，力学性能更为优良。通过对SWCM系统性研究，对其用于实体工程做数据理论支撑。

Abstract:

In order to solve the problems of high cement cost， high energy consumption and pollution， and based on the synergistic effect of solid waste， the fly ash （FA)， red mud （RM) and ultrafine steel slag powder （USS) are used as the raw materials， and the external water glass solution is used as the alkali activator to prepare the solid waste cementing material （SWCM). Through the laboratory tests， the variation of SWCM working mechanics and water stability performance is analyzed by the single-factor range method， and the hydration reaction mechanism of SWCM is analyzed by XRD and SEM microscopic tests. The test results show that the setting time， flexural and compressive strength and water stability of SWCM are the best when RM:USS = 1:4， and the working mechanical properties can meet the performance indexes of portland cement P.O42.5 and below. The production cost of SWCM is only 48.5 % ~ 55.4 % of that of P.O42.5 Portland cement. The hydration products of the specimen are mainly the calcium silicaluminate hydrate （C-S-（A)-H) and ettringite （AFt). When the age of the specimen increases， the number of C-S-（A)-H and AFt in the specimen can be increased by selecting the appropriate amount of RM and USS， and the mechanical properties are better. Through the systematic study of SWCM， it is used as the data theoretical support for entity engineering.