| 摘要: |
| 通过不同水胶比、不同减水剂掺量下的颗粒堆积密实度湿测法试验和水泥净浆扩展度试验，分析了水泥拌和物中填充水、絮凝水和富余水量随掺入水量增加的变化过程，量化分析了减水剂对絮凝水的释放效应和对颗粒堆积的密实效应，提出了考虑减水剂作用的修正净浆水膜厚度模型，并与已有试验结果进行了对比.结果表明：絮凝水释放量可以用不同减水剂掺量下饱和水比的差值进行计算，并与减水剂掺量呈线性关系；修正水膜厚度与净浆扩展度有良好的线性相关性；修正净浆水膜厚度模型能较好地预测水泥净浆的工作性能，可以为混凝土配合比设计提供理论参考. |
| 关键词: 工作性能 水膜厚度 减水剂 絮凝水 |
| DOI：10.3969/j.issn.1007-9629.2022.05.003 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51479013）；重庆交通大学研究生科研创新项目（2019S0125） |
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| Water Film Thickness Model of Cement Paste Considering the Effect of Superplasticizer |
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ZHENG Dan, XIN Quanhao, LIANG Yuntao
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College of River and Ocean Engineering， Chongqing Jiaotong University， Chongqing 400074， China
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| Abstract: |
| The experiments of wet packing density measurement and flow spread test of cement paste with different water solid ratios and different superplasticizer contents were conducted. The variation process of filling water， flocculating water and surplus water in the cement mix with the increase of admixture was analyzed， and the release effect of flocculating water and densification effect of particle accumulation of superplasticizer were quantitatively clarified. A modified water film thickness model considering the effect of superplasticizer was proposed and compared with the existing test results. The results show that the content of flocculating water can be calculated by the difference of saturated water ratio under different superplasticizer contents， which is linearly related to the superplasticizer contents. The modified water film thickness has a good linear correlation with the cement paste expansion， and the model can well predict the working performance of cement paste， which can provide references for scientific concrete mix ratio design. |
| Key words: working performance water film thickness superplasticizer flocculating water |
