Effect of Physical Characteristics of Manufactured Sand on Rheological Properties of Cement Mortar and Its Mechanism

被引：0
|
作者：
Wang J. [1 ,2 ]
An M. [1 ]
Liu Y. [1 ]
Wang Y. [1 ]
Yu Z. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University, Beijing
[2] Standards & Metrology Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 02期
关键词：
Adsorption; Gradation range; Manufactured sand; Mechanism; Physical characteristics; Rheological properties;
D O I：
10.3969/j.issn.1001-4632.2021.02.03
中图分类号：
学科分类号：
摘要：
Aiming at the problems of the poor workability, large loss of flowing time, easy bleeding and segregation of manufactured sand concrete, the mechanisms of such physical properties as the lithology, surface absorption and surface potential of manufactured sand on the rheological properties of cement mortar were studied by analyzing the influence of manufactured sand with different lithologies and gradation intervals on the rheological properties of cement mortar and the adsorption characteristics of superplasticizer. Results show that compared with calcareous manufactured sand, the influence of siliceous manufactured sand on the fluidity of cement mortar is greater. At the same time, the smaller the particle size gradation of manufactured sand is, the greater the influence is on the fluidity of cement mortar. The rheological properties of manufactured sand mortar are related to the absorption performance of manufactured sand on superplasticizer and the internal friction of manufactured sand. The adsorption performance of manufactured sand on superplasticizer is directly proportional to the amount of surface adsorption points. The higher the content of layered clay minerals in parent rock is, the stronger the adsorption performance of manufactured sand on superplasticizer is. The main factor affecting the rheological properties of cement mortar is the adsorption performance of manufactured sand on polycarboxylate superplasticizer, rather than the particle size and specific surface area of manufactured sand. © 2021, Editorial Department of China Railway Science. All right reserved.
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页码：19 / 27
页数：8
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