EFFECT CONTENT OF GYPSUM ON SOME HYDRAULIC PROPERTIES OF SOIL
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Abstract
A study was conducted to determine some basic concept associated with moisture characteristics such as Pore sizes, distribution and air entry value of soil at different gypsum content 0 -40% gypsum for the main Drying Curve (MDC) and Main Wetting Curve (MWC), under unsaturated condition. Van Genuchen equation used to describe the experimental data curve of the soil characteristic curve and determine the best-fit parameters m,n,α. Data moisture characteristic curve with capillation equation were used to find pore sizes distribution as a function of θ. Veng and M. Fredlund parameters were used for calculated air entry value (AEV). Results showed that the effective value of pore sizes diameter (d) increasing by increasing moisture content. Soil with the 0% gypsum content the highest value of pore sizes diameter (d) was 0.03762 cm and 0.022387 cm for both MDC and MWC, and the 5% gypsum treatment the lowest value of pore sizes diameter (d). Air entry value decreased with increasing of the soil gypsum content from 11.77 cm to 6.3638 cm for treatment 0% to 40% gypsum for the MDC respectively.
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Copyright (c) 2019 L. S. Kudayr, S. B. Salim (Author)
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