Influence of Controlled Permeability Formwork Liner on the Quality of the Cover Concrete

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Title: Influence of Controlled Permeability Formwork Liner on the Quality of the Cover Concrete

Author(s): A. A. Sha'at, A. E. Long, F. R. Montgomery, and P. A. M. Basheer

Publication: Special Publication

Volume: 139

Issue:

Appears on pages(s): 91-106

Keywords: carbonation; concrete durability; curing; durability; sorption; formwork (construction); permeability; strength; tests; Materials Research

Date: 9/1/1993

Abstract:
Numerous methods are available to improve the surface durability of concrete. The most commonly used techniques are improved curing practices and the application of surface treatments. A new technique that employs a controlled permeability formwork liner (CPF) has been introduced in the U.K. This paper describes the results of an investigation to compare the effect of the controlled permeability formwork liner with that of various curing techniques and the absorption of silane in relation to the air permeability, sorptivity, water permeability, and strength of the cover concrete. Also, the resistance to carbonation has been studied. Results indicate that, in general, the use of CPF improves the surface properties compared with conventional steel formwork. The effect of variation of curing methods was marginal for concrete with CPF.