| 硫酸盐对掺聚羧酸减水剂水泥浆体流变性的影响 |
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| 引用本文： | 何燕,张雄,张永娟.硫酸盐对掺聚羧酸减水剂水泥浆体流变性的影响[J].建筑材料学报,2015,18(6):930-934. |
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| 作者姓名： | 何燕 张雄 张永娟 |
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| 作者单位： | 同济大学先进土木工程材料教育部重点实验室,上海201804,同济大学先进土木工程材料教育部重点实验室,上海201804,同济大学先进土木工程材料教育部重点实验室,上海201804 |
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| 基金项目： | 国家自然科学基金资助项目（51378391）；“十二五”国家科技支撑计划项目（2011BAE27B04） |
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| 摘 要： | 研究了6种硫酸盐对掺聚羧酸减水剂水泥浆体的Marsh时间、剪切应力及表观黏度的影响.通过微观手段分析硫酸根离子对聚羧酸减水剂吸附量的影响.结果表明:碱金属硫酸盐会显著降低掺聚羧酸减水剂水泥浆体的分散性,而难溶性硫酸盐对掺聚羧酸减水剂水泥浆体分散性的影响较小.硫酸根离子大量存在时,聚羧酸减水剂的表观吸附量及无效吸附量增加,聚羧酸减水剂的分散性能降低,浆体絮凝结构数量及强度增大.
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| 关 键 词： | 硫酸盐 聚羧酸减水剂 流变性 吸附量 聚集行为 |
| 收稿时间： | 3/7/2014 12:00:00 AM |
| 修稿时间： | 4/1/2014 12:00:00 AM |
Effect of Sulfate on Rheological Properties of Cement Paste with Polycarboxylate Type Superplasticizer |
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| HE Yan,ZHANG Xiong and ZHANG Yongjuan.Effect of Sulfate on Rheological Properties of Cement Paste with Polycarboxylate Type Superplasticizer[J].Journal of Building Materials,2015,18(6):930-934. |
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| Authors: | HE Yan ZHANG Xiong and ZHANG Yongjuan |
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| Affiliation: | Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University, Shanghai 201804, China,Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University, Shanghai 201804, China and Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University, Shanghai 201804, China |
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| Abstract: | Effects of different sulfates on Marsh time, shear stress, and apparent viscosity of cement paste with polycarboxylate type (PC) superplasticizer were investigated. Through a series of micro measurements, it was indicated that with abundant SO2-4 in the cement paste, the adsorption amount of PC superplasticizer increased. The results show that sulfates with alkali ions(such as Na2SO4 and K2SO4) have a pronounced negative effect on the dispersity of PC superplasticizer, while the effect of indissolvable sulfate (such as CaSO4·2H2O) on the dispersity of PC superplasticizer is slight.Large amount of SO2-4 contributed to the declining dispersity of PC superplasticizer, and the increasing amount and strength of flocculent structure in cement paste. |
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| Keywords: | sulfate polycarboxylate type superplasticizer rheological property adsorption amount aggregation behavior |
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