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Formwork striking times - criteria, prediction and methods of assessment (R136)

State-of-the-art advice on striking times. Since the beginning of concrete construction, the decision to remove formwork and allow the structure to support itself has been a matter for judgement between the needs for speed of construction and for avoidance of collapse or damage. This publication describes the criteria governing the striking of formwork. It reviews methods for predicting striking times using computer programs and describes the applications of these systems. Users are also guided on techniques for reducing striking times where these are considered excessive. The methods for determining formwork striking times are described, together with their advantages and weaknesses. The detailed appendices include a method for calculating the concrete strength required for a structure to withstand wind loading shortly after removal of formwork, and an example of the calculation of maturity using the Sadgrove formula.

Key words: site management, concrete and structures.

ISBN: 978-0-86017-431-8
Author: T A Harrison
Number of pages: 72 (paperback)
Publisher: CIRIA
Date of Publication: January 1995