Run at least five tests increasing the water content each time. Therefore, when the results of sieve analysis and hydrometer analysis are combined, a discontinuity generally occurs in the range where they overlap. It is known that most soil particles are comprised of flaky shapes, principally in case of fine soils.
The evidence is raised by a major changes which introduced by the British Standard BS was that the preferred method of liquid limit testing became the Cone Penetrometer.
Liquid Limit LL or wL - the water content, in percent, of a soil at the arbitrarily defined boundary between the semi-liquid and plastic states.
These limits as such do not indicate the consistency of undisturbed soil. This is because soil particles are generally irregular in shape. The liquid limit of a soil can be determined using the Cone Penetrometer or the Casagrande apparatus BS The water content that is just sufficient to fill the pores when the Liquid Limit Definition The Liquid Limit, also known as the upper plastic limit, is the water content at which soil changes from the liquid state to a plastic state.
Plasticity index in also a measure of cohesiveness with high value of PI indicating high degree of cohesion. In the early s, the Swedish chemist Albert Atterberg developed a classification system and method with which these states of consistency could be determined.
Repeat steps 1 through 5 with a sample of soil at a slightly higher or lower water content. The apparatus is arranged to allow the metal cup to be raised repeatedly 10mm and dropped freely on to its rubber base at a constant rate of two drops per second.
Through out 3 part of the soil classification lab experiment, the soil sample prepared is classified as SPu, Poorly uniformed-graded SAND with slightly silty or clayey in accordance to British Soil Classification System.
As the water content increases it will take less blows to close the groove. Lift and drop the cup at a rate of 2 drops per second. The plasticity index is thus 8. This event causes a mismatch in the curve of grain size distribution obtained from sieving and hydrometer methods.
When considering the plastic limit test, amount of finger pressure used and the shape of the tips of fingers varies to a great extent and, in addition, operators frequently do not carry out the test using the tips of the fingers as specified in the British Standard since these are eminently unsuited to the task.
The behavior of the soil, therefore, is related to the amount of water in the system.
The result of attempts to improve reproducibility has been a complexity of procedure which has increased expenses. Procedures for Plastic Limit 1 The plastic limit is the moisture content of the soil under test when remoulded and rolled between the tips of the fingers and a glass plate such that longitudinal and transverse cracks appear at a rolled diameter of 3mm.
The goal is to roll a thread of 3. For base course common specification is P. Stop when the bottom of the groove becomes joined along a distance of 13 mm.
When determining the liquid limit with the Casagrande apparatus, the base of the cup is filled with soil and a groove is then made Lab report liquid and plastic the soil to the base of the cup.
The moisture contents of the soil specimen for each penetration values Sample Calculation for Penetration Calculations and expression of results Liquid Limit: The plasticity of soils is determined by using relatively simple remoulded strength tests. Take care to eliminate air bubbles from the soil specimen.
The index to indicate consistency of undisturbed soils is called liquidity index of the soil or Water Plasticity Ration of the soil.
The amount of water added shall be such that a range of penetration values of approximately 15mm to 25mm is covered by four or more test runs and is evenly distributed.
Greater the difference, greater is the plasticity of the soil. For liquid limit test, the penetration values are plotted against the moisture content. Casagrande as the water contents which exist under the following conditions: Soils with high plasticity index are highly compressible. Continue cranking until the two halves of the soil specimen meet each other at the bottom of the groove.
Record the number of drops required to close the groove.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‑swell and shear strength.
4 PLASTIC LIMIT Discussion In our experiment we have determined the liquid from CIVIL ENG CE at Jordan University of Science & Tech. Lab Report. Uploaded By ali Pages 6 PLASTIC LIMIT Discussion In our experiment we have determined the liquid limit, plastic limit, and plastic index%(4).
Liquid Limit Lab Report. Atterberg Limit: Liquid and Plastic Limit report To determine the liquid limit, the plastic limit and the linear shrinkage and plasticity index of Documents Similar To Lab Report-Atterberg Limit Test.
Soil Comp Action Test report by yasas Uploaded by. yasas/5(1). Liquid Limit is the soil water content where the soil changes from a plastic to a viscous (liquid) state. Liquid limit is determined using the Casagrande cup. Liquid limit is determined using the Casagrande cup.
Standard Test Methods for Liquid Limit, Plastic Limit, The liquid and plastic limits of a soil and its water Liquid Limit Device—A mechanical device consisting of a brass cup suspended from a carriage designed to control its 5 Annual Book of ASTM Standards, Vol The liquid, plastic and shrinkage limits are therefore quantified in terms of the water content at which a soil changes from the liquid to the plastic state.
The difference between the liquid limit and plastic limit is the plasticity index. Because the liquid limit and plastic limit are the two most commonly used Atterberg limits, the following.Download