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

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.