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Open AccessArticle

Estimation of Soil-Water Characteristic Curves in Multiple-Cycles Using Membrane and TDR System

School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea
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Academic Editor: Durga Misra
Materials 2016, 9(12), 1019; https://doi.org/10.3390/ma9121019
Received: 30 September 2016 / Revised: 28 November 2016 / Accepted: 13 December 2016 / Published: 17 December 2016
The objective of this study is to estimate multiple-cycles of the soil-water characteristic curve (SWCC) using an innovative volumetric pressure plate extractor (VPPE), which is incorporated with a membrane and time domain reflectometry (TDR). The pressure cell includes the membrane to reduce the experimental time and the TDR probe to automatically estimate the volumetric water content. For the estimation of SWCC using the VPPE system, four specimens with different grain size and void ratio are prepared. The volumetric water contents of the specimens according to the matric suction are measured by the burette system and are estimated in the TDR system during five cycles of SWCC tests. The volumetric water contents estimated by the TDR system are almost identical to those determined by the burette system. The experimental time significantly decreases with the new VPPE. The hysteresis in the SWCC is largest in the first cycle and is nearly identical after 1.5 cycles. As the initial void ratio decreases, the air entry value increases. This study suggests that the new VPPE may effectively estimate multiple-cycles of the SWCC of unsaturated soils. View Full-Text
Keywords: membrane; soil-water characteristic curve; time domain reflectometry; unsaturated soils; volumetric pressure plate extractor membrane; soil-water characteristic curve; time domain reflectometry; unsaturated soils; volumetric pressure plate extractor
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Hong, W.-T.; Jung, Y.-S.; Kang, S.; Lee, J.-S. Estimation of Soil-Water Characteristic Curves in Multiple-Cycles Using Membrane and TDR System. Materials 2016, 9, 1019.

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