水利学报2012，Vol.43Issue(3)：302-307,6.
溶蚀条件下水化硅酸钙结构演化与粉煤灰适宜掺量研究
Structure evolution of calcium silicate hydrate and suitable content of fly ash among cementitious materials under dissolution
摘要
Abstract
Cement pastes incorporated with fly ash（30%～70%） with and without dissolution were investigated employing 29Si MAS NMR（magic angle spinning nuclear magnetic resonance） technique.The mechanism of strength development with different fly ash content and property deterioration with dissolution was discussed.The results reveal that,the compressive strength of specimens decrease with the increase of fly ash content,and the descent ratio is the least when the content of fly ash is 50%.Accordingly,the intensity of Q1 and Q2 decreased with the increase of the content fly ash,and the attention of invesligation was captured by the change of Q1.The intensity of Q0,Q1 and Q2 decreased after dissolution when the content of fly ash was 0-50%,but Q1 did faster.The peak of Q1 was not distinct and the area under Q2 was lower than other series when the fly ash content was 70%.Correspondingly,the descent ratio of strength and property deterioration was significant.The intensity of Q2（1Al） increased obviously,especially with 50% fly ash.These results indicate that Q1 plays an important role of determining the suitable content of fly ash in cementitious materials,because it has a visible engineering property.关键词
粉煤灰/适宜掺量/溶蚀/核磁共振/水化硅酸钙Key words
fly ash/suitable content/dissolution/29Si MAS NMR/calcium-silicate-hydrate(C-S-H)分类
建筑与水利引用本文复制引用
蔡新华,何真,孙海燕,范福平..溶蚀条件下水化硅酸钙结构演化与粉煤灰适宜掺量研究[J].水利学报,2012,43(3):302-307,6.基金项目
国家自然科学基金 （）
教育部博士点专项基金 （）
国家重点基础研究发展计划 （）
