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Title: Form pressure characteristics of self-consolidating concrete used in repair
Authors: Assaad, Joseph 
Khayat, Kamal H.
Affiliations: Department of Civil and Environmental Engineering 
Keywords: Cohesion
Formwork surface
Lateral pressure
Self-consolidating concrete
Issue Date: 2021
Publisher: Elsevier
Part of: Cement and Concrete Composites
Volume: 122
This paper aims at assessing the lateral pressure exerted by self-consolidating concrete (SCC) on single-sided vertical formwork during repair work. Reinforced concrete repair wall elements measuring 5.6 ± 0.3 m in height and 180 mm in width were cast using SCC mixtures having different thixotropic characteristics at casting rates varying from 6 to 9.5 m/h. Results showed that the actual field pressure values are substantially lower than the equivalent hydrostatic pressure, varying from 60% to as low as 34% at the end of casting. This was attributed to the SCC structural build-up coupled with the presence of vertical/transverse reinforcing bars, arching effect in confined and tall repair sections, and increased friction between the concrete and existing repair substrate. The use of a 1.1-m high experimental PVC column was found appropriate to mimic the decay of lateral pressure observed in the repair wall elements, making it relevant to predict the effect of concrete restructuring on casting rate. Such data can be of interest to tailor the mixture proportions and enhance safety aspects related to casting slender repair sections with SCC.
ISSN: 09589465
DOI: 10.1016/j.cemconcomp.2021.104118
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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