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EXPERIMENT 3 : Plastic Limit Test Introduction The plastic limit, PL of a soil is the lowest water content at which the soil remain plastic, and when plotted against the liquid limit on the plasticity chart enables the classification of cohesive soils. The plasticity index of a soil is the numerical difference between the liquid limit and the plastic limit. It is the moisture content at which the soil is in a plastic state. Usually, the determination of the plastic limit is made in conju
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  EXPERIMENT 3 : Plastic Limit TestIntroduction The plastic limit, PL of a soil is the lowest water content at which the soil remain plastic, and when plotted against the liquid limit on the plasticity chart enables theclassification of cohesive soils. The plasticity index of a soil is the numericaldifference between the liquid limit and the plastic limit. It is the moisture content atwhich the soil is in a plastic state.Usually, the determination of the plastic limit is made in conunction with thedetermination of the liquid limit. It is recogni!ed that the results of the test aresubected to the udgement of the operator, and that some variability in results willoccur. It is important in civil engineering awareness of soil science for seismicmitigation of structure placed on soil foundation consists of soft soil. Objective To determine the samples of soil which the limit between plastic state andsemi plastic state. The plasticity index of a soil is the numerical difference between the liquidlimit and the plastic limit. It is the moisture content at which the soil is in a plastic state. Apparatus and Euipments #.$oil %ixing &quipment '$patula or Palette (nives, )lat *lass Plate, +istilledater-  .$ample of soil ' the left of sample after ta/ing out from the 0ven 1 #23 ##2 4 5-6.7alance 'accurate to 2.2# g-8.8 standard containers3.0ven Procedure #.9bout 2 g of soil sample paste too/ from the liquid limit test, a little pre  prepared dried soil added to it and shaped it into a ball..If soil in its natural state is used, allow it to dry partially on a glass plate beforeshaping it into a ball.6.The ball sample is molded between the fingers and rolls it between the palmsuntil the sample is dried sufficiently for slight crac/s to appear in its surface.The sample is then rolled on the glass plate with the palm. This sample isdivided into two sub samples of about #2g each and carries out separatedetermination on each portion. +ivide each sub sample into four more or lessequal parts and treat it.8.The soil molded in the fingers to equali!e the distribution of moisture. )romthe soil into thic/ threads by rolling the soil between the palms and then thethreads is rolled between the fingers 'from finger tip to second oint- of onehand and the surface of the glass rolling plate. 9lternate between mould androlling to effect the gradual drying of the soil.3.The sample is rolled into threads between the fingers, from the finger tip to thesecond oint of one hand and the palm of the other hand until the thread shears both longitudinally and the palm of the other hand until the thread shears bothlongitudinally and transversely when it has been rolled to about 3 mm indiameter si!e. +o not gather the pieces of sample together after they havecrumbled, in order to reform a thread and to continue rolling, the firstcrumbling point is the plastic limit.:. metal containers are ta/en and recorded their identification on the Table 8.#.&ach container is weighed separately and record weights are recorded.  ;.The crumbled thread is placed into one container and process of step 8 3 isrepeated on the three other remaining portions, placing all in the samecontainer. The container containing the crumbled threads is weighed and theweight recorded.<.The step 8 : is repeated on the duplicate sample formed in step 6 and thecrumbled threads are placed into another container. The container is weigh andcontents, and the weight recorded..=.The two containers are placed in the oven at a temperature of #23 1 ##2overnight '#: hours to 8 hours-. 9fter drying, the containers are removedfrom the oven and allow them to cool in a desiccator. .Tthe dry weight isrecorded and the moisture content is determined as specified in the %oisture5ontent Test.#2.The two moisture content values of the soil sample are recorded in table. Precaution #.e cannot rolled the soil paste on the surface of the table but ust can rolled onour palm to avoid further loss of moisture..*radual drying of the soil is affected by alternatively rolling and molding, not by continual rolling, either as a ball or as threads, which produces a driedcrust. ith soils that are marginally plastic it is often difficult to obtain thecorrect crumbling condition. Plasticit! #art  >esults and 5alculations7y the same process as the liquid limit measurements, we get the value of the plasticlimit?Plastic limit#a-5ontainer @o';<#- b-%ass of wet soil A container 'g-#6.;6a-%ass of dry soil A container 'g-#.6 b-%ass of container 'g-:.3:c-%ass of dry soil 'g-3.;:d-%ass of moisture 'g-#.8#e-%oisture content 'B-8.8<f-Plastic limit, PL 'B- 8.8<%#C %ass of container C 3.;: g%C %ass of container A wet soil C #6.;6 g
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