Journal
12TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS ON SUSTAINABLE, MODERN AND SAFE TRANSPORT
Volume 192, Issue -, Pages 124-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.proeng.2017.06.022
Keywords
SCC; fresh concrete; rheological properties; formwork pressure
Funding
- National Science Centre in Cracow, Poland [842/B/T02/2011/40]
- EU from European Regional Development Fund
- project DoktoRIS - Scholarship program for innovative Silesia - European Union under European Social Fund
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Formworks for self-compacting concrete (SCC) are commonly designed under the assumption of full hydrostatic pressure. However, current research shows that SCC's design pressure could be reduced, if the concrete's rheological properties were taken, into account. Knowing the relationship between the properties and the pressure, we can prevent formwork overdesign. This research was based, on the assumption that fresh concrete can be described as a Bingham fluid. This paper presents the correlations between static and dynamic yield stress, and lateral formwork pressure. Measured rheological parameters were compared to standard technical concrete tests. Formwork pressure were determined on the element imitating a column with dimensions of 0.20 x 0.20 m and a height of 1.20 m with two casting speeds 1 and 7 m/h. Three types of cement, 2 superplasticizers, and 2 w/c ratios were used. A correlation between rheological parameters and pressure reduction over time was observed. Based on our results we propose a methodology and testing sequence applicable in practice. (C) 2017 The Authors. Published by Elsevier Ltd.
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