硅酸盐通报2018，Vol.37Issue(3)：772-780,9.
硫酸盐侵蚀对不同养护制度UHPC水化产物微结构的影响
Effects of Sulfate Attack on Microstructure of UHPC Hydration Products under Different Curing Regimes
摘要
Abstract
By using the 29Si and 27Al Magic Angle Spinning Nuclear Magnetic Resonance(MAS NMR), XRD and SEM,effects of sulfate attack on microstructure of Ultra-High Performance Concrete(UHPC) hydration products under different curing regimes was studied.The results indicate that the hydration products of UHPC are mainly C-S-H,Ca(OH)2,AFt,AFm and TAH in standard curing and 80℃high temperature steam curing.After 210℃,2 MPa autoclave curing for 8 h,the main hydration products are tobermorite, Ca(OH)2and TAH.The effect of sulfate attack on the compressive strength and microstructure of UHPC with different curing regimes is weak, but the transformation from TAH to AFm and AFt in UHPC gel cured in autoclave regime is promoted at 210 ℃.At the same time, when the sulfate attacked to 180 d, the MCL and Al[4]/Si of C-S-H gel decreases slightly, but the reduction range is small.UHPC has good resistance to sulfate attack.关键词
UHPC/硫酸盐侵蚀/养护制度/微结构Key words
UHPC/sulfate attack/curing regimes/microstructure分类
建筑与水利引用本文复制引用
丁庆军,刘勇强,刘小清,耿春东,胡曙光,陈宝春..硫酸盐侵蚀对不同养护制度UHPC水化产物微结构的影响[J].硅酸盐通报,2018,37(3):772-780,9.基金项目
国家自然科学基金重点项目(U1305245) （U1305245）
国家重点基础研究发展计划(973计划)(2015CB655101) （973计划）
