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Which of the below is the soil classification for the given data? Passing 0.074 mm sieve = 60% Liquid limit = 45% Plastic limit = 39% Use Highway research board classification system.

Which of the below is the soil classification for the given data? Passing 0.074 mm sieve = 60% Liquid limit = 45% Plastic limit = 39% Use Highway research board classification system. Correct Answer A – 5

According to the system, the soil is granular if percent passing 0.074 mm sieve is less than 35% and fine grained if it is more than 35%. Since the percent passing 0.074 mm sieve is more than 35% in question (60%), the soil is fine grained. The value of liquid limit must be a minimum of 41% for groups A – 5 and A – 7. Since the value in question is 45%, it may be A – 5 or A – 7. If the maximum plasticity index is 10, then it is A – 5, and if the minimum is 11, it is group A – 7. As per the question, plasticity index, PI = liquid limit – plastic limit = 45 – 39 = 6%. Therefore, it is classified as A – 5.

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