Question

A well graded soil is said to be frost susceptible if more than _________

(a) 10 % particle are smaller than 0.002 mm

(b) 3 % particle are smaller than 0.002 mm

(c) 3 % particle are smaller than 0.005 mm

(d) 10 % particle are smaller than 0.005 mm

This question was addressed to me in homework.

My query is from Frost Action in division Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

Answer 1

Correct choice is (b) 3 % particle are smaller than 0.002 mm

Easy explanation: A well graded soil is reckoned to be frost susceptible if 3 % particle are smaller than 0.002 mm and for poor graded soil 10 % particle are smaller than 0.002 mm.