Mechanism of Viscosity for Recycled Powder-Cement Paste Based on the Adsorption of Superplasticizer
LI Zhen1,2, LIU Jiaping3,*, QIAO Min1, YU Cheng1, XIE Weixiao3, CHEN Junsong1
1 State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 2 Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China 3 School of Material Science and Engineering, Southeast University, Nanjing 211189, China
Abstract: To improve the workability of cement-based material with recycled powder(RP), the effect of superplasticizers on the rheological properties of RP-cement paste was investigated. Meanwhile, the adsorption behavior of superplasticizers in paste, the packing density and the viscosity of interstitial solution were analyzed to reveal the adsorption on the viscosity of paste with RP. The results show that superplasticizers has a stronger adsorption ability on the RP surfaces with the similar flow spread of paste, especially for the carboxylic-superplasticizer and sulfonic-superplasticizer. Whereas, a higher packing density and viscosity of interstitial solution can be obtained for the paste with the addition of phosphonic-superplasticsizer, which will affect the viscosity of cement paste with RP together. Due to a lower viscosity of the interstitial solutions of carboxylic-superplasticizer and sulfonic-superplasticizer, the viscosity of cement paste with a low substitution rate of RP is lower than that of paste with phosphonic-superplasticsizer. However, with a high substitution rate of 30%, the well dispersion of mix particles with the help of phosphonic-superplasticizer can result in an increased packing density, thus leading to a lower viscosity of cement paste with RP, compared to that of paste with other superplasticizers.
作者简介: 李贞,博士,工程师。2020年1月毕业于东南大学,获材料科学与工程博士学位。同年加入江苏苏博特新材料股份有限公司研究院工作至今,主持和参与国家自然科学基金青年项目和国家重点研发计划等多个项目,主要从事固体废弃物的资源化利用和混凝土制品技术研究。以第一作者在Cement and Cement Composites、Cement and Building Materials、《建筑结构学报》等国内外学术期刊上发表论文10余篇。
引用本文:
李贞, 刘加平, 乔敏, 于诚, 谢惟肖, 陈俊松. 基于减水剂吸附行为的再生微粉-水泥浆体黏度调控机理研究[J]. 材料导报, 2023, 37(8): 21090090-7.
LI Zhen, LIU Jiaping, QIAO Min, YU Cheng, XIE Weixiao, CHEN Junsong. Mechanism of Viscosity for Recycled Powder-Cement Paste Based on the Adsorption of Superplasticizer. Materials Reports, 2023, 37(8): 21090090-7.
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