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Influence of Water Cement Ratio and Curing on the Permeability and Structure of Hardened Cement Paste and Concrete

Published online by Cambridge University Press:  22 February 2011

Herbert Gräf  and
Max J. Setzer
Herbert Gräf
Affiliation:
Research Center of the Cement Industry, Tannenstraβe 2, 4000 Dülsseldorf 30, W. Germany
Max J. Setzer
Affiliation:
University – GH – Essen, Inst. Physics of Construction and Materials Science, Universitätsstraβe 15, 4300 Essen 1, W. Germany
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Abstract

Curing affects sincerely the durability of concrete especially in surface regions. This is reflected in the pore structure and in the permeability. In a systematic research the structural changes due to water cement ratio and curing have been studied by mercury porosimetry, by nitrogen adsorption, by oxygen diffusion and by oxygen permeability. Due to these results diffusion and permeability are connected by a power law. Structural changes alter the permeability by four orders of magnitude. The results can be well explained by pore size distribution both for hcp and for concrete. Carbonation and frost action as well as strength and elastic modulus are closely correlated to permeability and therefore to pore structure. For practical application it is possible to give advice for concreting and curing. Service life can be predicted by permeability measurements in an early stage. The results are comparable with Nyames /20/.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 137: Symposium P – Pore Structure and Permeability of Cementitious Materials , 1988 , 337
Copyright
Copyright © Materials Research Society 1989

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