不同水泥对脱硫建筑石膏胶凝材料性能和微观结构的影响  

Effects of Different Cements on the mechanical Properties and Microstructure of Flue Gas Desulfurization Gypsum Cementitious Materials

作　　者：劳有盛 杨久俊[1,2] 张磊 王雪平[1] 余海燕[1] 

机构地区：[1]天津城建大学材料科学与工程学院,300384 [2]天津市软土特性与工程环境重点试验室,300384

出　　处：《混凝土与水泥制品》2013年第11期6-9,共4页China Concrete and Cement Products

基　　金：国家科技支撑计划课题(2012BAJ02B01-05);天津市科技支撑计划重点项目(12ZCZDSF1500)

摘　　要：主要研究铝酸盐水泥(AC)、普通硅酸盐水泥(OPC)对脱硫建筑石膏胶凝材料水化后微观结构与性能的影响。试验结果表明,单掺AC初、终凝时间最高分别延长至54.5min和64min,抗折强度和抗压强度最高可分别增加到15.3MPa和43.6MPa;单掺OPC初、终凝时间最短分别为4min和5.5min,抗折强度和抗压强度可分别最高增加到14.3MPa和36.3MPa;复合掺杂两种水泥的凝结时间,抗折强度和抗压强度介于单掺两者之间。XRD和SEM的研究结果表明,掺水泥后形成了钙矾石和团聚状C-S-H凝胶,钙矾石的填充作用和C-S-H凝胶的胶结作用是复合胶凝材料增强的原因。Abstract：The mechanical properties and microstructure of flue gas desulfurization gypsum doped with aluminate cement （AC） and ordinary Portland cement （OPC） are investigated. Results show that the initial and final setting time are prolonged to 54.5min and 64min respectively, the flexural strength and compressive strength are increased up to 15.3MPa and 43.6MPa respectively doped with AC. And the initial and final setting time are only 4min and 5.5rain respectively, the flexural strength and compressive strength are increased up to 14.3MPa and 36.3MPa respectively doped with OPC. The setting time, flexural strength and compressive strength are ranged between single doped when these two kinds of cement are doped at the same time. The ettringite （AFt） and C-S-I[ gel are observed in all samples. Filling the role of AFt and cementation of C-S-H gel are the reason for the composite cementitious material reinforced.

关 键 词：脱硫石膏 高铝水泥 普通硅酸盐水泥 力学性能 微观结构 钙矾石 C—S—H凝胶 

分 类 号：TQ177.3[化学工程—硅酸盐工业]