Technical Questions

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Factors affecting permeability

Q. What are the important factors affecting permeability?


A. Permeability indicates the ability of liquids or gases to flow under pressure through concrete. Low permeability is a principal requirement for concrete exposed outdoors. To achieve low permeability, the w/cm must be limited. It is also beneficial to replace a portion of the portland cement with pozzolans or slag. Consolidation and curing are also important.


References: SP-1(02); ACI 201.1R-08; ASTM C1202

Topics in Concrete: Concrete Fundamentals; Durability; Permeability

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