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固硫灰是循环流化床锅炉燃煤固硫产生的工业废渣,具有自硬性、火山灰活性和膨胀性等特性,将其与碱性激发剂复合作为胶凝材料制备建筑砂浆将有望降低水泥用量、提高砂浆保水率和改善砂浆收缩。作者利用固硫灰-激发剂作为二元复合胶凝材料制备干混砌筑砂浆,研究碱性激发剂掺量、固硫灰细度、保水增稠材料掺量、胶砂比和砂级配对砂浆性能的影响。实验表明:粉磨至一定细度的固硫灰中掺15%碱性激发剂、胶砂比为1∶2、砂级配为1∶1时可制备28d抗压强度达到10.7MPa的干混砌筑砂浆,砂浆保水率94.7%、凝结时间6.9h、2h稠度损失率14.1%,各项性能均符合GB/T 25181—2010的要求。
Sulfur-fixing ash is a kind of industrial waste residue produced by sulfur solidification in coal-fired circulating fluidized bed boilers. It has characteristics of self-hardening, volcanic ash activity and expansibility. It is expected to reduce the amount of cement when it is used as a cementitious material to compound it with alkaline activator , Improve mortar water retention and improve mortar shrinkage. The authors make use of solid-sulfur-activator as binary composite cementitious materials to prepare dry-mix mortar. The effects of basic activator dosage, sulfur fineness, water-holding thickening content, mortar ratio and sand grade matching Effect of mortar properties. Experiments show that: the grinding to a certain degree of fineness of the sulfur-added dust mixed with 15% basic activator, mortar ratio of 1: 2, sand grade 1: 1 can be prepared 28d compressive strength of 10.7MPa dry mix Masonry mortar, water retention rate of 94.7% mortar, setting time 6.9h, 2h consistency loss rate of 14.1%, all of the performance are in line with GB / T 25181-2010 requirements.