Pressure of Concrete Against Formwork

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Title: Pressure of Concrete Against Formwork

Author(s): N. J. Gardner

Publication: Journal Proceedings

Volume: 77

Issue: 4

Appears on pages(s): 279-286

Keywords: concrete construction; formwork (construction); fresh concretes; hydrostatic pressure; lateral pressure; loads (forces); placing; plasticizers; pressure; slump tests; structural design; temperature; vibration; vibrators (machinery).

Date: 7/1/1980

Abstract:
The paper reviews the currently accepted design equations concerned with the lateral pressure of fresh concrete against vertical form faces and discusses the various factors that influence the lateral pressure; namely, vibration, rate of placing, minimum form dimension, concrete slump, and concrete temperature. The paper also reports experimental results obtained at the University of Ottawa on a large instrumented form. From the experimental results a design lateral pressure equation was developed. The experimental results are compared with the results predicted by the proposed equation and the accepted CIRIA and ACI equations.