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Effect of Chemical Admixtures on Rheological Properties of Mortars
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Chaoyang ZHANG, Jianwei YU, Xiangming KONG, Yi CAI
Journal of the Chinese Ceramic Society | 2020, 48(5) : 622 - 631
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Journal of the Chinese Ceramic Society | 2020, 48(5): 622-631
Effect of Chemical Admixtures on Rheological Properties of Mortars
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Chaoyang ZHANG, Jianwei YU, Xiangming KONG, Yi CAI
Affiliations
  • Institute of Building Materials, Department of Civil Engineering, Tsinghua University, Beijing 100084, China

    • ZHANG Chaoyang (1994-), male, Doctoral candidate. E-mail:

About Author:

ZHANG Chaoyang (1994-), male, Doctoral candidate. E-mail:

Published: 2020-05-20 doi: 10.14062/j.issn.0454-5648.20190645
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Effects of water-binder ratio, polycarboxylate superplasticizers (PCEs) with different molecular structures, super-absorbent polymer (SAP) and an anionic viscosity modifying agent (VMA) on the rheological properties of mortar were investigated. The results show that increasing the water-binder ratio simultaneously reduces the yield stress and plastic viscosity of mortar and increases the fluidity retention capacity. The addition of PCE reduces the yield stress of mortar and the steric hindrance induced by the side carbon chains is one of the main reasons for the dispersion effect of PCE. The side carbon chains inhibit the adsorption of PCE on the surface of cement particles. Increasing the length of the side chains of PCE has little effect on the initial rheology. SAP increases the yield stress and plastic viscosity of mortar by reducing its free water content, and its action mechanism is the same as reducing the water-binder ratio. VMA improves the yield stress of mortar due to the bridging effect at low dosages, but has little effect on the plastic viscosity. At high dosages, the bridging effect of VMA weakens but the viscosity of liquid phase greatly increases, thus decreasing the enhanced effect on the yield stress of mortar and greatly increasing the plastic viscosity of mortar.

mortar  /  rheological property  /  water-to-binder ratio  /  polycarboxylate superplasticizers  /  viscosity modifying agent
张朝阳, 喻建伟, 孔祥明, 蔡熠. 化学外加剂对砂浆流变性能的影响. 硅酸盐学报, 2020 , 48 (5) : 622 -631 . DOI: 10.14062/j.issn.0454-5648.20190645
Chaoyang ZHANG, Jianwei YU, Xiangming KONG, Yi CAI. Effect of Chemical Admixtures on Rheological Properties of Mortars[J]. Journal of the Chinese Ceramic Society, 2020 , 48 (5) : 622 -631 . DOI: 10.14062/j.issn.0454-5648.20190645
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Article Info
doi: 10.14062/j.issn.0454-5648.20190645
  • Receive Date：2019-09-22
  • Online Date：2026-10-29
  • Published：2020-05-20
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History
  • Received：2019-09-22
  • Revised：2019-11-27
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Affiliations
    Institute of Building Materials, Department of Civil Engineering, Tsinghua University, Beijing 100084, China

Corresponding:

KONG Xiangming (1974-), male, Ph.D., Associate Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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