期刊
CEMENT AND CONCRETE RESEARCH
卷 140, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2020.106316
关键词
LC3; Thixotropy; Water distribution; Zeta potential; H-1 NMR
资金
- National Key RD Plan [2016YFE0206100]
- Education Department of Shandong Province [2019GGX102077]
- Science and Technology Innovation Support Plan for Young Researchers in Institutes of Higher Education in Shandong [2019KJA017]
- Case-by-Case Project for Top Outstanding Talents of Jinan, National Natural Science Foundation of China [51672107, 51761145023, 51802112]
- Shandong Provincial Natural Science Foundation [ZR2019BEM034]
- 111 Project of International Corporation on Advanced Cement-based Materials [D17001]
- Taishan Scholars Program [ts201712048]
Limestone calcined clay cement (LC3) displays unique thixotropic properties, primarily influenced by the negative surface charge and flocculation phenomenon, which affects its fluidity and development trend.
Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, H-1 nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time.
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