Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluating the Utility of Tensiometers for Establishing Water Retention Characteristics Curves of Fly Ash
Fly ash has become an accepted waste material for many geotechnical and geoenvironmental applications such as embankment construction, compacted pavement/ roads construction, hydraulic barrier, and fertilizer in agricultural fields. In all these applications, the material remains in an unsaturated state and hence its characterization is essential. The primary characterization of unsaturated geomaterial depends on the accurate determination of the water retention characteristics curve (WRCC), which is the relationship between the suction (negative pore water pressure) and water content or degree of saturation. In this study, four different fly ashes collected from Indian thermal power plants were characterized for its WRCC using two tensiometers. One of the tensiometers used measures matric suction directly within a range of 80 kPa and the other known as equitensiometer has its measurement range up to 1000 kPa. The main objective of this study is to investigate the utility of these two tensiometers in establishing the WRCC of different fly ashes. This will help in choosing an appropriate suction measurement methodology for fly ashes, so that the WRCC is unambiguous. It was found that the near saturation portion and part of desaturation portion of the WRCC could be obtained by using lower range tensiometer (<80 kPa). The equitensiometer result was found to approach the residual portion of WRCC as well. The measured results were used to determine WRCC equation parameters. The influence of range of suction measurement on WRCC parameterization of fly ash was investigated.
Evaluating the Utility of Tensiometers for Establishing Water Retention Characteristics Curves of Fly Ash
Fly ash has become an accepted waste material for many geotechnical and geoenvironmental applications such as embankment construction, compacted pavement/ roads construction, hydraulic barrier, and fertilizer in agricultural fields. In all these applications, the material remains in an unsaturated state and hence its characterization is essential. The primary characterization of unsaturated geomaterial depends on the accurate determination of the water retention characteristics curve (WRCC), which is the relationship between the suction (negative pore water pressure) and water content or degree of saturation. In this study, four different fly ashes collected from Indian thermal power plants were characterized for its WRCC using two tensiometers. One of the tensiometers used measures matric suction directly within a range of 80 kPa and the other known as equitensiometer has its measurement range up to 1000 kPa. The main objective of this study is to investigate the utility of these two tensiometers in establishing the WRCC of different fly ashes. This will help in choosing an appropriate suction measurement methodology for fly ashes, so that the WRCC is unambiguous. It was found that the near saturation portion and part of desaturation portion of the WRCC could be obtained by using lower range tensiometer (<80 kPa). The equitensiometer result was found to approach the residual portion of WRCC as well. The measured results were used to determine WRCC equation parameters. The influence of range of suction measurement on WRCC parameterization of fly ash was investigated.
Evaluating the Utility of Tensiometers for Establishing Water Retention Characteristics Curves of Fly Ash
Abhijit, D. (Autor:in) / Sreedeep, S. (Autor:in)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 307-315
24.02.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Determination of the Soil Water Retention Curve with Tensiometers
| Springer Verlag | 2007
| British Library Online Contents | 2011
| British Library Conference Proceedings | 2014