摘要
以钢渣和矿渣为矿物掺合料,采用0%和20%的取代量,在蒸养(早期80℃蒸养7 h)和标养条件下分别制备了钢渣和矿渣复合水泥胶砂,经过28 d的初始标准养护后,将其暴露于干湿循环与半浸泡2种硫酸盐侵蚀条件下,通过外观质量观察、质量变化和强度变化等手段对比了钢渣复合水泥胶砂与矿渣复合水泥胶砂的耐硫酸盐侵蚀性能.结果表明:2种养护制度下,钢渣复合水泥胶砂的耐干湿循环硫酸盐侵蚀性能均优于矿渣复合水泥胶砂;半浸泡硫酸盐侵蚀条件下,标养钢渣复合水泥胶砂的性能弱于标养矿渣复合水泥胶砂,但是蒸养钢渣复合水泥胶砂的情况正好相反.蒸养虽然粗化了水泥胶砂孔结构,使得蒸养水泥胶砂在半浸泡硫酸盐侵蚀条件下较早地出现了裂缝,但是蒸养同样提高了28 d水泥胶砂的化学结合水量、C-S-H含量并促进了C-A-S-H的形成,从而有助于改善蒸养水泥胶砂的抗硫酸盐侵蚀性能.
Steel slag(SS)and ground granulated blast furnace slag(GGBFS)blended cement mortars were prepared under two replacement levels(0%and 20%)and two curing regimes(initial steam curing at 80℃for 7 h and initial standard curing).After 28 d standard curing,they were exposed to two kinds of sulfate attack conditions:dry-wet cycles and partial immersion.The sulfate resistances were compared by appearance quality check,mass change and strength change.The results show that,no matter what initial curing condition is applied,SS cement mortar shows better performance than the GGBFS cement mortar under dry-wet cycles and sulfate attack.The performance of standard cured SS cement mortar is worse than that of standard cured GGBFS cement mortar under partial immersion sulfate attack,but the situation of steam cured SS cement mortar is just the opposite.The initial steam curing coarsens the pore structure of the cement mortar so that cracks appear earlier in the steam cured mortar than that in the standard cured one under the partial immersion,but the initial steam curing also improves the non-evaporable water content and C-S-H gels content in the cement mortar hydrated for 28 d,and promotes the C-A-S-H formation,thus,helping to improve the sulfate resistance of steam cured mortars.
作者
李保亮
霍彬彬
尤南乔
朱国瑞
陈春
张亚梅
Li Baoliang;Huo Binbin;You Nanqiao;Zhu Guorui;Chen Chun;Zhang Yamei(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第6期1144-1152,共9页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51778132)
中日政府间科技合作资助项目(2016YFE0118200)
关键词
钢渣复合水泥胶砂
矿渣复合水泥胶砂
蒸养
硫酸盐侵蚀
干湿循环
半浸泡
steel slag blended cement mortar
GGBFS blended cement mortar
steam curing
sulfate resistance
dry-wet cycles
partial immersion
