Virtual soil science learning resources 2,485 views. Plastic limit test, procedures, sample calculations. Pdf determination of plastic limit of soil using modified methods. Determination of plastic limit of soil the constructor. After we have done the experiment liquid limit and plastic limit tests, we found that the plastic index of the soil is equal to 27 and the liquid limit of the soil is equal to 50. 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. Apparatus needed to carry out the test are, laboratory porcelain dish, spatula, soil sample, balance to an accuracy of 0. Report report the individual and the mean of the results as the plastic limit of the soil to the nearest second decimal. The group performed standard practice in determining the liquid limit, plastic limit, and plasticity index of a soil sample in accordance to astm d 4318. 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.
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. Pdf atterberg limits test introduction maneesh shakya. Precautions at no time shall an attempt be made to produce failure at exactly 3mm diameter. Determination of liquid limit and plastic limit of soil. The following procedures are followed step by step. Liquid limit is defined as the water content at which the soil changes from liquid state to plastic. If the sample is taken after completion of the liquid limit test and is still too dry to permit rolling to a 3. Atterberg limit objective to determine the liquid limit. 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. The calculated liquid limit of the soil sample is 34, its plastic limit as 20, and plasticity index as 14. Standard test methods for liquid limit, plastic limit, and. Pdf a note on the determination of plastic limit of finegrained. A number in parentheses indicates the year of last reapproval.
Determination of plastic limit is as important as liquid limit so as to ascertain plasticity index, ip of the soil. Pdf plastic limit is an important property of finegrained soils. Liquid limit of soil, determination of liquid limit plastic limit, atterberg limit test procedure,ll duration. 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. Add sufficient water to produce a consistency that will require 25 to 35 drops of the cup to cause closure. In this article test methods used for determination of soil plastic limit in accordance with astm d4148 will be presented. This lab is performed to determine the plastic and liquid limits of a fine grained soil.
Determine the plastic limit for at least two points of the soil passing 425 micron is sieve. The threadrolling test was standardised at the us public roads bureau in the 1920s and 1930s, and has subsequently become one. Pdf standard test methods for liquid limit, plastic limit, and. 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. Atterbergs original liquid limit test involved mixing a pat of clay in a roundbottomed porcelain. Liquid limit and plastic limit tests lab experiments. To improve consistency, a 3 mm diameter rod is often used to gauge the thickness of the thread when conducting the test. The plastic limit of soils was first described by atterberg in 1911.