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Thermal Conductivity of Pervious Concrete for Various Porosities
Thermal conductivity (K) of pervious concrete specimens was measured using the heat-flow meter and the thermal needle probe methods. The two test methods were first conducted on 285.75 mm (11.25 in.) dry square slabs with varying porosities (q>) from 19 to 36%. Strong linear K-q> relationships were obtained based on both methods. On average, K for the slabs was 0.50 W/(mK) using the heat-flow meter, and 0.62 W/(mK) by the needle probe. Using the needle probe, 4% water in the slabs resulted in a 20% increase in K. One-hundred millimeter (4 in.) diameter cylinders were saw cut in half and were testedfor K at the top and bottom. K-q> were obtained for the cylinder halves using the needle probe. The mean geometric model showed a near-perfectfitfor the slabs in dry conditions. The modelfit reasonably well to the top cylinders 'K and overestimated K for bottom cylinders with a mean square error of 0.012 W/(mK).
Thermal Conductivity of Pervious Concrete for Various Porosities
Thermal conductivity (K) of pervious concrete specimens was measured using the heat-flow meter and the thermal needle probe methods. The two test methods were first conducted on 285.75 mm (11.25 in.) dry square slabs with varying porosities (q>) from 19 to 36%. Strong linear K-q> relationships were obtained based on both methods. On average, K for the slabs was 0.50 W/(mK) using the heat-flow meter, and 0.62 W/(mK) by the needle probe. Using the needle probe, 4% water in the slabs resulted in a 20% increase in K. One-hundred millimeter (4 in.) diameter cylinders were saw cut in half and were testedfor K at the top and bottom. K-q> were obtained for the cylinder halves using the needle probe. The mean geometric model showed a near-perfectfitfor the slabs in dry conditions. The modelfit reasonably well to the top cylinders 'K and overestimated K for bottom cylinders with a mean square error of 0.012 W/(mK).
Thermal Conductivity of Pervious Concrete for Various Porosities
Nassiri, Somayeh (author) / Nantasai, Benjamin
ACI materials journal ; 114
2017
Article (Journal)
English
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