Concrete Air Permeability Age Effects on Concrete

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Title: Concrete Air Permeability Age Effects on Concrete

Author(s): R. Munoz Martialay

Publication: Special Publication

Volume: 100

Issue:

Appears on pages(s): 335-350

Keywords: age; air; concrete durability; long-time study; permeability; Materials Research

Date: 4/1/1987

Abstract:
The results obtained on the evolution of permeability to air of six slabs for a period of 20 years are described. Measurements were taken at four pressure levels: 0.40, 0.95, 1.35, and 1.90 kp/cmý. The concrete plates of 1 x 1 x 0.20 m were placed in a test chamber. The results from permeability have a qualitative value, as boundary effects are unknown. In the bibliography, the publication includes quantitative results of eight concretes of different dosage. Differences obtained among the slabs, even having the same dosage and being similarly conserved, are pointed out. Twenty years after the concrete was made and in normal preservation conditions of a test chamber, a tendency to stabilization of permeability values is observed, especially in the lower pressure, 0.40 kp/cmý.