Prediction of Lateral Form Pressure Exerted by Cement-Based Materials at Low Casting Rates

Author(s): Arnaud Perrot, Alexandre Pierre, Vincent Picandet
Paper category: Conference
Book Title: 8th International RILEM Symposium on Self-Compacting Concrete - SCC 2016
Editor: Kamal H. Khayat
ISBN: 978-2-35158-156-8
e-ISBN: 978-2-35158-157-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 329-338
Total Pages: 10
Language: English

Abstract: In this work, we propose to extend the Ovarlez and Roussel model, for estimating lateral form pressure exerted by fresh concrete, to low casting rates and long duration formwork filling. In this case, the assumption of a linear increase of the concrete yield stress with time at rest is imprecise. This assumption is valid for approximately one hour at rest after placing and may lead to an overestimation of the lateral pressure for a longer period. Based on chemical arguments and experimental observations, it has been shown that the yield stress increases exponentially over time. The same fundamental physical assumptions made by Ovarlez and Roussel are used to predict the lateral pressure exerted on formwork. Comparison of the proposed model with experimental measurements shows that, pressure can be predicted with an accuracy comparable to the Ovarlez and Roussel model for casting times less than one hour. The prediction of the previously published model has been improved in case of slow and very low casting rates.

Online publication: 2016
Publication Type: full_text
Public price (Euros): 0.00