碱激发材料与硅酸盐水泥在盐湖环境中的性能对比研究  

Comparative Study on Performance of Alkali-Activated Slag Cement and Portland Cement in Bittern Environment

作　　者：宋强[1,2] 张肖燕[1] 李婷[1] 朱建辉[1,3] 

机构地区：[1]西安建筑科技大学材料与矿资学院,西安710055 [2]陕西省低变质煤洁净利用重点实验室,榆林719000 [3]陕西循环经济工程技术院,西安710055

出　　处：《硅酸盐通报》2015年第5期1360-1364,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家重点基础研究发展(973)计划(2012CB723302);陕西省自然科学基金(2012JM6006)

摘　　要：为克服传统硅酸盐水泥材料在盐湖环境中性能劣化严重的不足,通过浸烘循环,对比研究了在清水和模拟盐湖环境下,碱激发矿渣(AAS)水泥和硅酸盐水泥(PC)强度发展和微观结构的变化。实验结果表明:AAS材料具有优异的抗盐湖侵蚀能力,其强度随着养护龄期延长逐渐提高,20次循环之前强度增长迅速,且激发剂含量越高,强度增长约快。养护于盐湖溶液中的PC强度随时间逐渐下降,40次浸烘循环后完全破坏。激发剂含量越高,处于盐湖溶液中的碱激发材料孔隙率越低,扫描电镜结果表明,在材料孔隙中结晶的石膏晶体和氯化钠晶体有效填充了孔隙。盐湖环境使得PC多害孔含量明显增加,但使AAS水泥孔结构得到细化,提高了材料的力学性能。The blast-furnace slag and NaOH were used to prepare alkali-activated slag （AAS） cement. Under the immersion-dry condition, the effect of bittern on AAS cement and PC was studied by testing on the strength and micro structure of the specimens stored in artificial bittern solution, or fresh water at certain periods. The experimental results show that the AAS cement exhibits excellent resistance to chemical attack of bittern. The significant increase of strength of AAS mortar stored in bittern solution was observed with the soaking time, and the strength increases very quickly before 20 times of immersion-dry cycle, and the more the contents of NaOH activator in AAS cement, the more the strength gained. But the strength of PC decreases fast after 17 d, and PC was destroyed completely after 40 times of immersiondry cycle. And the more the contents of activator, the less porosity of AAS cement is. According to the scanning electron microscope observation, the crystal-growth of NaCl and CaSO4· H2O fill the void space of AAS cement. Curing the AAS cement in bittern environment leads to a reduction in the total pore volume and to a refinement of the pore structures.

关 键 词：碱激发矿渣 盐湖环境 抗压强度 孔结构 

分 类 号：TQ172[化学工程—水泥工业]