硅酸盐学报2021，Vol.49Issue(8)：1662-1669,8.DOI:10.14062/j.issn.0454-5648.20200878
不同粒径纳米氧化硅改性白水泥水化过程的1H低场核磁弛豫特征
1H Low-Field NMR Relaxation Characteristics of Hydration Process of White Cement Modified with Silica Nanoparticles
摘要
Abstract
1H low-field nuclear magnetic resonance instrument was used to continuously monitor the changes in the transverse relaxation time of white cement with silica nanoparticles with different sizes (i.e.,15 nm,50 nm and 100 nm) from adding water to hydration for 72 h.The effect of silica nanoparticles with different sizes on the hydration process of cement was investigated.The setting time of cement paste was measured using the Vicar apparatus.The results show that the crystal nucleation of silica nanoparticles can affect the early hydration process of cement,thus breaking the flocculation structure of cement paste due to the physical adsorption and pozzolanic reaction,reducing the number of macropores,and improving the uniformity of cement paste.In addition,the smaller the silica nano particles is,the less the free water content in hydration process and the shorter the setting time will be.关键词
纳米氧化硅/白水泥/低场核磁共振/横向弛豫时间/水化过程Key words
nano-silica/white cement/low-field nuclear magnetic resonance/transverse relaxation/hydration分类
建筑与水利引用本文复制引用
张爱,葛勇..不同粒径纳米氧化硅改性白水泥水化过程的1H低场核磁弛豫特征[J].硅酸盐学报,2021,49(8):1662-1669,8.基金项目
国家自然科学基金项目(51278157). （51278157）
