偏高岭土对聚合物改性水泥浆体流变的影响

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (2): 17-23.

偏高岭土对聚合物改性水泥浆体流变的影响

关玲^*1, 袁志华²

1.重庆外语外事学院, 重庆 401120;
2.东华理工大学土木与建筑工程学院, 江西南昌 330013

收稿日期:2022-09-17 出版日期:2024-04-28 发布日期:2024-04-29
通讯作者: 关玲(1986-),女,重庆开县人,副教授.Email:Guanling202209@163.com
基金资助:
国家自然科学基金(52078088),重庆市教育委员会项目(193345)

Effect of metakaolin on rheology of polymer modified cement paste

GUAN Ling¹, YUAN Zhi-hua²

1. Chongqing Institute of Foreign Studies, Chongqing 401120, China;
2. School of Civil and Architectural Engineering, East China University of Technology, Nanchang China

Received:2022-09-17 Online:2024-04-28 Published:2024-04-29

摘要/Abstract

摘要： 研究了偏高岭土掺量对不同水胶比的聚合物改性水泥浆体流动度、流变参数、触变性和粘弹性的影响.结果表明:掺入偏高岭土的复合浆体在新拌阶段的流变性能符合H-B模型,并且所有浆体均呈剪切稀化的流变特性.随着偏高岭土掺量的增大,浆体流动度、屈服应力和塑性黏度均增大.掺入20%偏高岭土后,水泥浆体的触变环面积由原来的1 502 Pa·s^－1增加至6 672.63 Pa·s^－1,并且水胶比更低的浆体对应更大的触变面积.所有的复合浆体均存在明显的粘弹特性,并且当偏高岭土掺量越大时,浆体的临界点振幅和线性区的储能模量值均越大.

关键词: 偏高岭土, 聚合物, 水泥浆体, 流变性

Abstract: The effects of metakaolin content on the fluidity, rheological parameters, thixotropy, and viscoelasticity of polymer-modified cement pastes with different water-to-binder ratios were studied. The results showed that the rheological properties of the fresh composite paste incorporating metakaolin conform to the H-B model during the initial mixing stage, and all the pastes show the rheological characteristics of shear thinning. With the increase of metakaolin content, the fluidity, yield stress, and plastic viscosity of the paste all increase. After adding 20% metakaolin, the thixotropic loop area of cement paste increases from its original value of 1 502 Pa·s^－1 to 6 672.63 Pa·s^－1, and lower water-to-binder ratio pastes correspond to a larger thixotropic area. All the composite pastes have obvious viscoelastic properties, and the critical strain amplitude and storage modulus values of linear viscoelastic range increase as the metakaolin content increases.

Key words: metakaolin, polymer, cement paste, rheology

中图分类号:

TU528

关玲, 袁志华. 偏高岭土对聚合物改性水泥浆体流变的影响[J]. 兰州理工大学学报, 2024, 50(2): 17-23.

GUAN Ling, YUAN Zhi-hua. Effect of metakaolin on rheology of polymer modified cement paste[J]. Journal of Lanzhou University of Technology, 2024, 50(2): 17-23.

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