The liquid limit test is done to determine the liquid limit of cohesive soils.it is arbitrary defined as the water content, in percent, at which a portion of soil in in a standard cup and cut by a groove of standard dimensions will flow together at the base of the groove for a distance of half an inch.

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Atterberg limits lab
The liquid limit
Introduction
The liquid limit test is done to determine the liquid limit of cohesive soils.it is arbitrary defined as the water content, in percent, at which a portion of soil in in a standard cup and cut by a groove of standard dimensions will flow together at the base of the groove for a distance of half an inch. When subjected to 25 blows from the cup being dropped 10 mm in a standard liquid limit apparatus that works in the rate of blows per second. As you test for the liquid limit in the lab it is important to care how to organize your information before the test begins the most advisable is the tabular form. After the tests are done results are obtained and the liquid limit can be determined by graphing the ,moisture content (%) versus the number of blows in a semi –log plot.

Conclusion
From measuring the penetration and determining the water content of the soil the liquid limit was able to be determined. As the liquid limit corresponds to the water content .a liquid limit of 19.2 was obtained. This result reveals that when water content in the soil rises above 19.2 % the soil will begin to behave like a liquid where it is able to deform under its own weight. The liquid limit value reveals that the soil is of low plasticity. The liquid limit is necessary to find as it gives an indication into the engineering behavior of the soil as a higher water content correlates to a higher plasticity and lower strength.
plastic limit test
Introduction
The plastic limit of the soil is the moisture content, can be expressed as a percentage of the weight of the oven dry soil, and at the boundary between the plastic and semisolid states of consistency .it is the moisture content at which a soil will just begin to crumble when rolled into a thread on a flat non-porous surface. If the soil is at moisture content where its behavior is plastic this thread will remain in its original shape down into a very narrow diameter. The sample can be remolded and used in another test.as the moisture content falls due to evaporation the thread begins to break apart at larger diameters. The plastic limit has a standard value. The plastic limit is defined as the moisture content where the thread breaks apart at a diameter of 1/8 inch. A soil is considered non plastic if a thread cannot be rolled out down to 1/8 inch at any moisture possible. Plastic limit can also be calculated by
Plastic limit= weight of water/weight of dry –oven soil x100

Conclusion
According to our lab findings the average soil plasticity was 10%. The low plasticity is due to its low liquid level 25% .soils mechanical properties primarily depend on the nature of the soil and its grains.
After determining the atterberg limits we determine the plasticity index in order to achieve our main objective which is to determine the type of soil we are dealing with the help of the casagrandes plasticity chart. When engineers want to construct foundations, roads, dams etc. they need to know the type of soil structure present. If for example it’s not strong enough could be excavated and replaced with a more stable type of soil. And at this point atterberg limits prove to be useful.