3. A dry soil has a total volume of 250 em3 and 120 cm pore volume. Caleulate th

Question

3. A dry soil has a total volume of 250 em3 and 120 cm pore volume. Caleulate the volume of air, water and the solid at 100, 60, 30 and 0 percent water saturation? Calculate the bulk density and porosity of a soil sample that has an oven-dry weight of 300 g and a volume of 250 cm3 A soil core was taken for determination of bulk density, and the following measurements were recorded: volume of eylinder 200 em3, weight of dry soil 260 g. Calculate the percentage of 5. nare enace asemino 265 olcm narticle densitv o cm

Explanation / Answer

Question 3. Total volume =250 cu.m Pore volume = 120 cu.m Since it is a dry soil, the pore volume is the volume of air. When percentage of saturation is 100: Volume of pore = volume of water. It is a fully saturated condition where pores with air will be replaced by water. Therefore, volume of air = 0. Volume of water = volume of pores = 120 cu.m Volume of solids = total volume - pore volume = 250-120 130 cu.m When saturation percentage is 60: Volume of water = 60% of 120 = 72 cu.m volume of air = 120 - 72 = 48 cu.m Volume of solids = 250 - 72 - 48 = 130 cu.m When saturation percentage is 30: Volume of water = 0.3 x 120 = 36 cu.m volume of air = 120 - 36 = 84 cu.m Volume of solids = 130 cu.m When saturation percentage is 0: Volume of water = 0 Volume of air = 120 cu.m Volume of solids = 130 cu.m

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