A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Apparent Contact Angle and Water Entry Head Measurements for Organo-Silane Modified Sand and Coal Fly Ash
Organo-silane (OS) surface modification chemically alters the surface of silica-based materials such as soils and industrial byproducts, rendering them hydrophobic. Such modification offers the potential to transform porous media with relatively high hydraulic conductivity into a water-repellent barrier to infiltration. This paper reports on experimentally observed relationships between dry density, apparent contact angle, and water entry head for Ottawa sand and a Class-F coal fly ash (CFA). Modification with two different OS products resulted in maximum apparent contact angles of approximately 120° and 140° for sand and CFA, respectively. Both products and materials exhibited an asymptotic relationship such that increasing OS dosages beyond a threshold level yielded diminishing increases in contact angle. The water entry head was found to range from 0 to 14 cm of water and 0 to 542 cm of water for OS-modified sand and OS-modified CFA, respectively. Positive correlations were established between dry density, apparent contact angle, and water entry head. Soil hydrophobicity was found to have a negligible effect on saturated hydraulic conductivity; the governing parameter for infiltration control is water entry head. The Washburn equation was found to provide reasonable estimates of experimentally observed water entry head, especially at large values of apparent contact angle. These results suggest that designing with water repellency is a plausible concept for infiltration control.
Apparent Contact Angle and Water Entry Head Measurements for Organo-Silane Modified Sand and Coal Fly Ash
Organo-silane (OS) surface modification chemically alters the surface of silica-based materials such as soils and industrial byproducts, rendering them hydrophobic. Such modification offers the potential to transform porous media with relatively high hydraulic conductivity into a water-repellent barrier to infiltration. This paper reports on experimentally observed relationships between dry density, apparent contact angle, and water entry head for Ottawa sand and a Class-F coal fly ash (CFA). Modification with two different OS products resulted in maximum apparent contact angles of approximately 120° and 140° for sand and CFA, respectively. Both products and materials exhibited an asymptotic relationship such that increasing OS dosages beyond a threshold level yielded diminishing increases in contact angle. The water entry head was found to range from 0 to 14 cm of water and 0 to 542 cm of water for OS-modified sand and OS-modified CFA, respectively. Positive correlations were established between dry density, apparent contact angle, and water entry head. Soil hydrophobicity was found to have a negligible effect on saturated hydraulic conductivity; the governing parameter for infiltration control is water entry head. The Washburn equation was found to provide reasonable estimates of experimentally observed water entry head, especially at large values of apparent contact angle. These results suggest that designing with water repellency is a plausible concept for infiltration control.
Apparent Contact Angle and Water Entry Head Measurements for Organo-Silane Modified Sand and Coal Fly Ash
Keatts, Matthew I. (author) / Daniels, John L. (author) / Langley, William G. (author) / Pando, Miguel A. (author) / Ogunro, Vincent O. (author)
2018-03-30
Article (Journal)
Electronic Resource
Unknown
| British Library Online Contents | 2018
Soil Improvement with Organo-Silane
| ASCE | 2009
Soil Improvement with Organo-Silane
| British Library Conference Proceedings | 2009
Organo-silane coated substrates for DNA purification
| British Library Online Contents | 2011
Contact Angle Measurements for Use in Specifying Organosilane-Modified Coal Combustion Fly Ash
| British Library Online Contents | 2017