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石粉岩性和表面积对聚羧酸减水剂吸附行为的影响是决定减水剂在机制砂混凝土中分散性能的关键因子。基于增强石粉界面减水剂吸附、改善浆体流动性的基本思路，对比研究了常规聚羧酸减水剂和引入磷酸基的减水剂对水泥–微斜长石粉浆体流变行为的影响。引入磷酸基可以提高减水剂在微斜长石粉表面的吸附，改善混合体系的堆积密实度，同时增加固体颗粒表面平均间距，提高了减水剂在水泥–微斜长石粉浆体中的分散性能，有效降低了浆体表观粘度。体系中微斜长石粉含量增加，含磷酸基减水剂相比仅含羧基的减水剂性能更优异。
Abstract：The performance of polycarboxylate(PCE) superplasticizer in concrete with machine-made sand greatly depends on the adsorption behavior on stone powder, which is concerned with the lithology and specific surface area. The workability can be improved via enhancing the adsorption of PCE on stone powder. In this regard, the rheological behavior of cement paste and cement/microcline paste with conventional PCE superplasticizer and phosphate-containing PCE superplasticizer was tested. The incorporation of phosphate group can enhance the adsorption of PCE molecule on the surface of microcline, thus improving the packing density of cement/microcline mixture. The average particle separation distance increases. Therefore, the dispersing performance of PCE superplasticizer in the mixture is obviously improved. The apparent viscosity of paste is reduced. The performance of phosphate-containing superplasticizer is even better when incorporating high content of microcline.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20220821
中图分类号:TU528.042.2
引用信息:
[1]舒鑫,毛永琳,张倩倩,等.选择性吸附对含磷酸基减水剂在水泥-微斜长石粉浆体中分散性能的影响[J].硅酸盐学报,2023,51(05):1126-1135.DOI:10.14062/j.issn.0454-5648.20220821.
基金信息:
国家自然科学基金(52178215); 江苏省自然科学基金(BK20201075); 南京市科技计划项目(202002027)
2022-09-30
2022
2023-02-07
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