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Comparative study of adsorption isotherm and kinetics of superplasticizer on cement and fly ash particles
Author(s): 
Pages: 612-615
Year: Issue:  5
Journal: Materials Science and Technology

Keyword:  GetLinkList(KeywordFilter('减水剂水泥粉煤灰吸附')'kw''CJFD');
Abstract: 为了揭示水泥与粉煤灰对减水剂的竞争吸附规律,采用分光光度法研究了SMF、FDN和ASP三种减水剂在此两种颗粒表面的吸附行为.结果表明,三种减水剂在胶凝颗粒表面的吸附均符合Langmuir等温吸附方程,属单分子层吸附.吸附量顺序均为:SMF>FDN>ASP.20℃时,SMF、FDN、ASP减水剂在水泥表面的饱和吸附量分别为12.95、11.35、3.83mg/g,而在粉煤灰表面的饱和吸附量则分别为3.15、2.86、1.10mg/g,表明水泥对减水剂的吸附强于粉煤灰对减水剂的吸附.减水剂在胶凝颗粒表面的吸附动力学也遵循Lang-muir吸附速率方程,SMF、FDN在水泥表面的平均吸附速率大于在粉煤灰颗粒表面的平均吸附速率,而ASP在两种胶凝颗粒表面的吸附速率较为接近.研究表明SMF、FDN将优先吸附在水泥颗粒表面,而ASP在水泥和粉煤灰表面的吸附选择性不高.
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