| 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. |
| 关键词: 硫酸盐 聚羧酸减水剂 流变性 吸附量 聚集行为 |
| DOI：10.3969/j.issn.1007 9629.2015.06.003 |
| 分类号: |
| 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） |
|
| Effect of Sulfate on Rheological Properties of Cement Paste with Polycarboxylate Type Superplasticizer |
|
HE Yan, ZHANG Xiong, ZHANG Yongjuan
|
|
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University, Shanghai 201804, China
|
| 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. |
| Key words: sulfate polycarboxylate type superplasticizer rheological property adsorption amount aggregation behavior |
