The rate of rolling should be between 80 to 90 strokes per minute to form a 3mm dia. I) Take about 8g of the soil and roll it with fingers on a glass plate. Procedure to determine The Plastic Limit Of Soil Mix the soil with distilled water in an evaporating dish and leave the soil mass for naturing. Take out 30g of air-dried soil from a thoroughly mixed sample of the soil passing through 425µm IS Sieve.
Iii) Container to determine moisture content I) Porcelain evaporating dish about 120mm dia. It begins to crumble when rolled into threads of 3mm dia. This test is done to determine the plastic limit of soil as per IS: 2720 (Part 5) – 1985.The plastic limit of fine-grained soil is the water content of the soil below which it ceases to be plastic.
