【作者】 马保国； 李相国； 王信刚； 朱洪波； 王凯；

【Author】 MA Bao-guo, LI Xiang-guo, WANG Xin-gang, ZHU Hong-bo, WANG Kai (Key Laboratory for Silicate Material and Engineering Ministry of Education, Wuhan University of Technology, 430070, China)

【机构】 武汉理工大学硅酸盐材料工程教育部重点实验室；

【摘要】 用激光粒度分析仪、N2吸附比表面积测定仪、SEM和化学分析等手段,研究不同种类粉煤灰的组分、粒度分布和表面结构等形态效应。在此基础上,研究与分析了粉煤灰对水泥浆体中Cl-的吸附固化作用与机理。研究表明粉煤灰主要以球形颗粒为主,颗粒粒径分布波动0-60μm,平均粒径为10-15μm,粉煤灰颗粒具有空心结构和较大的内比表面积。与水泥浆体相比,纯粉煤灰浆体对氯离子的固化力稍低一些,其相对固化率为26.7%。粉煤灰对氯离子吸附固化机理在于粉煤灰和水化产物(如C-S-H凝胶体)具有较大比表面积和特殊结构,对自由Cl-离子产生物理吸附作用;水化铝酸钙与Cl-反应生成“Friedel盐”而产生Cl-化学固化作用。更多还原

【Abstract】 The configuration effect on composition, particle size distribution and surface structure of different kinds of fly ash were investigated by means of laser particle size distribution, chemical analysis, N2 absorption specific surface area and SEM. Based on the results, the properties and mechanism of absorption and binding chloride iron in cement pastes with fly ash. The results demonstrated that fly ash is mostly crowned particle, the particle size distribution ranges from 0 to 60μm, and the mean particle size is 10-15μm. Moreover, fly ash particles have hollow structure and higher specific surface area. Compared with cement pastes, initial binding capacity of pure fly ash is lower, the relative binding rate is 26.7%. The absorption and binding mechanism is that fly ash and C-S-H gel have good physical binding capacity to chloride iron due to their special structure and larger specific surface. Moreover, that hydrated calcium aluminate reacts with Cl- forms “Friedel” salt, which is chemical binding capacity to free chloride iron.更多还原