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Using the below given data, which of the options represent the group index of the soil? Passing 0.074 mm sieve = 50% Liquid limit = 46% Plastic limit = 37%

Using the below given data, which of the options represent the group index of the soil? Passing 0.074 mm sieve = 50% Liquid limit = 46% Plastic limit = 37% Correct Answer 4

Using the equation for group index as GI =0.2a+0.005ac+0.01bd where “a” represents the portion of material passing 0.074 mm sieve, greater than 35 but not exceeding 75 percent (represented as whole number in the range 0-40), “b” represents the portion of material passing 0.074 mm sieve, greater than 15 but not exceeding 35 percent (expressed as whole number in the range 0-40), “c” represents the liquid limit in excess of 40 but less than 60 (expressed as whole number in the range 0-20), “d” represents the plasticity index in excess of 10 but less than 30 (expressed as whole number in the range 0-20) As per the question, Plasticity index = liquid limit – plastic limit = 46 – 37 = 9 a=50-35=15 b=50-15=35 c=46-40=6 d=9-10=0 (whole number) GI =0.2×15+0.005×15×6+0.01×35×0=3.45 \(\approx\) 4 (whole number).

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