An investigation on structural build-up of cement paste containing superplasticizers and fly ash under different temperatures

Author(s): Wenkai Shen, Caijun Shi, Kamal Khayat, Qiang Yuan, Rong Zeng ,
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
ISBN:978-2-35158-204-6
e-ISBN:978-2-35158-205-3
Publisher: RILEM Publications SARL
Publication year:2018
Pages:122-134
Total Pages:13
Language : English

Abstract: When fresh cement-based materials are at rest, their structure can build-up. The structural build-up at rest of the cement-based materials is crucial to many concrete applications, such as formwork pressure, 3D printing, and multi-layer casting. Besides, constituents of the concrete mixtures, temperature are also important factors affecting the structural build-up at rest. In this paper, the structural build-up of cement pastes incorporating fly ash and polycarboxylate superplasticizers (PCs) was investigated by means of growth of static yield stress test. Calorimetric testing was also carried out. Results showed that the elevated temperature significantly accelerated the hydration of cement paste, and had a positive effect on the
structural build-up of the cement pastes. The role of fly ash on the structural build-up in the cement pastes was temperature-dependent and the PCs retarded the structural build-up process. This phenomenon was more pronounced in the mixture exposed to lower temperature.

Online publication : 2018
Publication type : full_text
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