Abstract
Hydraulic conductivity or permeability is a key parameter that affects the stability of fresh cement-based materials. For example, bleeding and water retention are among the most important issues governed by concrete permeability. Whereas this parameter is relatively easy to measure at the cement paste scale, it is difficult to evaluate with the addition of sand or gravel due to the sample size needed to obtain a representative sample. For ordinary permeability measurement, the test duration is linearly linked to the sample height. The aim of this study is to relate the concrete permeability to the cement paste permeability for various aggregate volume fractions in mortar or concrete. The proposed model uses an adaptation of Darcy’s law to compute concrete permeability from measured cement paste permeability and mix-design parameters. This model has been successfully tested with kaolin and cement pastes with spherical aggregates (glass beads) and sand.
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