Plastic limit test pdf

Report report the individual and the mean of the results as the plastic limit of the soil to the nearest second decimal. Proceed to plastic limit yes test 3 add more soils to the proceed to soilwater mixture left secure 2 grams of plastic limit until you can form the sample from the. Pdf atterberg limits test introduction maneesh shakya. The atterberg limits are a basic measure of the critical water contents of a finegrained soil. A number in parentheses indicates the year of last reapproval. Precautions at no time shall an attempt be made to produce failure at exactly 3mm diameter. As we get the result of plastic limit, it will use to obtain the plastic index by the formula of liquid limit deduct plastic limit. Standard test methods for liquid limit, plastic limit, and.

Determination of plastic limit of a soils by means of a rolling device a new approach to the determination of the shear strength of clays by the fallcone test theory and practice of the fall cone. The calculated liquid limit of the soil sample is 34, its plastic limit as 20, and plasticity index as 14. Atterberg limit objective to determine the liquid limit. Determination of plastic limit of soil the constructor. The liquid limit, plastic limit and plasticity index of soils are also used extensively, either individually or together, with other soil properties to correlate with engineering behavior such as compressibility, permeability, compactibility, shrink. The plastic limit of soils was first described by atterberg in 1911. This lab is performed to determine the plastic and liquid limits of a fine grained soil. Pdf determination of plastic limit of soil using modified methods. To improve consistency, a 3 mm diameter rod is often used to gauge the thickness of the thread when conducting the test. Determination of liquid limit and plastic limit of soil. Pdf a note on the determination of plastic limit of finegrained. Liquid limit of soil, determination of liquid limit plastic limit, atterberg limit test procedure,ll duration. In this article test methods used for determination of soil plastic limit in accordance with astm d4148 will be presented.

Virtual soil science learning resources 2,485 views. Note 1 allow ample time for mixing and curing since variations can cause erroneous test results. Determination of plastic limit is as important as liquid limit so as to ascertain plasticity index, ip of the soil. The following moisture conditions liquid limit, plastic limit, along with shrinkage limit are referred to as the atterberg limits, after the originator of the test. Liquid limit is defined as the water content at which the soil changes from liquid state to plastic. Add sufficient water to produce a consistency that will require 25 to 35 drops of the cup to cause closure. Standard test methods for liquid limit, plastic limit, and plasticity index of soils1 this standard is issued under the. Determine the plastic limit for at least two points of the soil passing 425 micron is sieve. The results have shown that if the plastic limit tests are performed by a trained operator, then consistent results can be obtained and that the cffect of size of the. Apparatus needed to carry out the test are, laboratory porcelain dish, spatula, soil sample, balance to an accuracy of 0. The following procedures are followed step by step. Atterbergs original liquid limit test involved mixing a pat of clay in a roundbottomed porcelain. Liquid limit and plastic limit tests lab experiments. Pdf plastic limit is an important property of finegrained soils.