Characterization of surface gas permeability measurements on a variety of natural and engineered building materials using two relatively new, non-destructive surface permeameters is presented. Surface gas permeability measurements were consistent for both laboratory and field applications and correlated well with bulk gas permeability measurements. This research indicates that surface permeability measurements could provide reliable estimates of bulk gas permeability; and due to the non-destructive nature and relative sampling ease of both surface gas permeability tools, it is possible to quantify the range of the spatial autocorrelation, heterogeneity, and anisotropy in porous building materials and their degree of degradation from weathering.
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Grover D, Savidge CR, Townsend L, Rosario O, Hu LB, Rizzo DM, Dewoolkar MM. Surface permeability of natural and engineered porous building materials. Construction and Building Materials. 2016 Jun 1;112:1088-100.