剪切速率和温度对低水胶比水泥浆流变性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 48-56.

所属专题：水泥混凝土

剪切速率和温度对低水胶比水泥浆流变性能的影响

申文凯^1,2, 元强³, 纪友红⁴, 曾荣⁴, 李巍⁴, 李富民², 史才军²

1.青岛理工大学,滨海人居环境学术创新中心,青岛 266033;
2.湖南大学土木工程学院,绿色先进土木工程材料及应用技术湖南省重点实验室,长沙 410082;
3.中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075;
4.华润水泥技术研发(广西)有限公司,南宁 530000

收稿日期:2022-08-12 修订日期:2022-09-07 出版日期:2023-01-15 发布日期:2023-02-15
通信作者: 史才军,博士,教授。E-mail:cshi@hnu.edu.cn
作者简介:申文凯(1993—),男,博士,副教授。主要从事水泥基材料流变、混凝土泵送和3D打印方面的研究。E-mail:shenwenkai@qut.edu.cn
基金资助:
国家重点研发计划(2017YFB0310100)

Effects of Shear Rate and Temperature on Rheology of Cement Paste with Low Water-to-Binder Ratio

SHEN Wenkai^1,2, YUAN Qiang³, JI Youhong⁴, ZENG Rong⁴, LI Wei⁴, LI Fumin², SHI Caijun²

1. Innovation Institute for Sustainable Maritime Architecture Research and Technology, Qingdao University of Technology, Qingdao 266033, China;
2. Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, School of Civil Engineering, Hunan University, Changsha 410082, China;
3. National Engineering Laboratory for Construction of High Speed Railway, School of Civil Engineering, Central South University, Changsha 410075, China;
4. China Resources Cement Tech. R&D (Guangxi) Co., Ltd., Nanning 530000, China

Received:2022-08-12 Revised:2022-09-07 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： 水泥浆体的流变性能不仅与材料本身有关,还受环境及外部作用影响。本文针对水泥基材料实际工程中存在的主要外部影响因素,即剪切作用与环境温度,研究了两者对低水胶比水泥浆流变性能的耦合作用。结果表明:水泥浆体在剪切过程中的流变行为与所施加的预剪切有关,水泥浆体的屈服应力随预剪切速率的增大而减小,剪切增稠的程度随预剪切速率的增大而增大;温度升高,水泥颗粒对减水剂的吸附量增加,浆体在不同剪切速率下的平衡表观黏度减小;温度和剪切速率对水泥浆平衡表观黏度的影响具有耦合效应,剪切速率越高,温度的影响越小,反之亦然,并建立了不同温度和剪切速率下平衡表观黏度的数学关系。

关键词: 水泥浆, 减水剂, 剪切速率, 温度, 流变性能, 耦合效应, 吸附

Abstract: The rheological properties of cement paste are not only related to its proportion, but also influenced by the environmental effects. In this paper, considering the main external effect factors existed in the actual engineering of cement-based materials, the influences of temperature and shear rate on the rheology of cement paste with low water-to-binder ratio were investigated. The results show that the rheological properties of cement paste are related to the pre-shearing before data logging, the yield stress decreases and shear-thickening intensity increases with the increasing pre-shearing rate. The superplasticizer adsorption on cement particles increases and the apparent viscosity at equilibrium decreases with the elevating temperature. Besides, the effects of temperature and shear rate on the equilibrium apparent viscosity of cement paste have a coupling effect. The higher the shear rate, the smaller the effect of temperature, and vice versa. The mathematical relationship of equilibrium apparent viscosity under different temperatures and shear rates is established.

Key words: cement paste, superplasticizer, shear rate, temperature, rheology, coupled effect, adsorption

中图分类号:

TU528

申文凯, 元强, 纪友红, 曾荣, 李巍, 李富民, 史才军. 剪切速率和温度对低水胶比水泥浆流变性能的影响[J]. 硅酸盐通报, 2023, 42(1): 48-56.

SHEN Wenkai, YUAN Qiang, JI Youhong, ZENG Rong, LI Wei, LI Fumin, SHI Caijun. Effects of Shear Rate and Temperature on Rheology of Cement Paste with Low Water-to-Binder Ratio[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 48-56.

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剪切速率和温度对低水胶比水泥浆流变性能的影响

Effects of Shear Rate and Temperature on Rheology of Cement Paste with Low Water-to-Binder Ratio

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