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A methodology to assess robustness of self-compacting concrete based on a paste rheological threshold theory

Author(s): Ding Nie and Xuehui An
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
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:18
Language : English

Abstract: The present paper highlights the importance of robustness in self-compacting concrete (SCC) production. A new methodology to assess the robustness of SCC against water and superplasticizer content was proposed. This methodology was based on a rheological
threshold theory at paste level. The theory indicated that the SCC formulated paste must satisfy the criteria to ensure good flowability and segregation resistance. A total of 12 cement paste mini-slump flow tests were initially conducted, and the relevant rheological
characteristics were derived. The correlation between mixture variables and rheological characteristics was determined using a bilinear interpolation method. A self-compacting zone (SCC-zone) at paste level was defined by determining the mixtures whose rheological
characteristics satisfied the criteria. The mixtures at the border of SCC-zone were obtained to assess robustness, and an iteration process was introduced to ensure that the rheological characteristics of these mixtures satisfied the criteria. The robustness of SCC was analysed quantitatively by using this methodology. Finally, paste tests with cement containing fly ash and limestone powder were introduced to verify this methodology and the differences of robustness between these mix proportions were analysed.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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