Soil Mechanics Lap - Lab Report Example

rent laboratory tests, which were performed to determine various important mechanical properties and index of soils: Atterberg Limits, Visual classification, compaction (Moisture-Density relationship), Constant Head Method (Hydraulic Conductivity), Consolidation, and Unconfined Compression Test. This lab was performed with a view to determine the liquid and plastic limits of fine-grained soil. The LL (Liquid limit) is defined arbitrary as the water content expressed in percent, at which part of soil in a cut and standard cup by the groove of dimensions can flow together at a groove for 13 mm, when it is subjected to 25 shocks from a cup, which is being dropped from a distance of 10 mm in a standard LL apparatus operated at two shocks per second.

The PL (Plastic Limit) refers to water content, expressed as a percentage, at which soil can be deformed any longer by rolling it into 3.2 mm diameter threads without crumbling. Porcelain dish, Liquid limit device, Flat grooving tool with gage, Balance, Spatula, Drying oven set at 150 degrees Celsius, Eight moisture cans, Wash bottle filled with distilled water, and Glass plate 1. About three quarters of the soil was taken and placed into the porcelain dish. The soil was thoroughly mixed with some small amounts of distilled water until a smooth uniform paste appeared.

The cellophane was used to cover the dish in order to prevent moisture from getting out. 3. The liquid limit apparatus was adjusted by checking height of the drop of cup. The block which was the end of grooving tool was 10 mm high and was used as a gauge. Using the cup, the correct rate was determined by rotating the crank to drop the cup approximately 2 times per second. 4. A portion of previously mixed soil was placed into the cup containing the liquid limit apparatus at a point where the cup could rest on the base.

The soil was squeezed down in order to eliminate air pockets and ensure it is spread into a cup to a 10 mm depth at its deepest point. 6.