Question: What Is Liquid Limit And Plastic Limit?

What is meant by liquid limit?

Liquid limit (LL) is defined as a limiting water content separating the viscous liquid state and plastic state of soil consistency.

From: Applied Clay Science, 2017..

What is the importance of Atterberg limits?

The Atterberg limits can be used to distinguish between silt and clay, and to distinguish between different types of silts and clays. The water content at which the soils change from one state to the other are known as consistency limits or Atterberg’s limit.

Is code for plastic limit of soil?

DETERMINATION OF PLASTIC LIMIT AND PLASTICITY INDEX Page 4 STANDARDS • IS: 2720 (Part-5) 1985. OBJECTIVE • Plastic limit is defined as minimum water content at which soil remains in plastic state. APPARATUS • Porcelain evaporating dish about 12cm in diameter. Flat glass plate 10mm thick and about 45cm square or longer.

What is elastic limit and plastic limit?

A load that exceeds the elastic limit deforms the material into the plastic region, which means that the material is permanently deformed when the load is removed. The plastic limit occurs when the material reaches the maximum plastic deformation – the breaking point.

How do you find Atterberg limits?

Liquid LimitPlace a soil paste in the cup.Cut a groove at the center of the soil paste with the standard grooving tool.Lift the cup and drop it from a height of 10mm, using the crank-operated cam. … Repeat the procedure at least three times for the same soil at varying moisture contents.More items…

What is a plastic limit?

The plastic limit is the water content at which a soil-water paste changes from a semisolid to a plastic consistency as it is rolled into a 3.175-mm (1/8-inch) diameter thread in a standard test.

How do you calculate liquid limit?

x) Liquid limit is determined by plotting a ‘flow curve’ on a semi-log graph, with no. of blows as abscissa (log scale) and the water content as ordinate and drawing the best straight line through the plotted points. Report the water content corresponding to 25 blows, read from the ‘flow curve’ as the liquid limit.

What is plastic limit of soil?

2.1 The plastic limit of a soil is the moisture content, expressed as a percentage of the weight of the oven-dry soil, 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 ⅛ in.

Why are plastic limits and liquid limits important?

This is very important when trying to build with or build on these type of materials. The two commonly determined Atterberg Limits represent the moisture contents at which a specific soil’s behavior changes from solid to plastic (Plastic Limit) and from plastic to liquid (Liquid Limit).

Why is liquid limit important?

Value of liquid limit is used to classify fine grained soil. It gives us information regarding the state of consistency of soil on site. Liquid limit of soil can be used to predict the consolidation properties of soil while calculating allowable bearing capacity & settlement of foundation.

Why is there 25 blows in liquid limit?

7.3. The liquid limit is the moisture content at which the groove, formed by a standard tool into the sample of soil taken in the standard cup, closes for 10 mm on being given 25 blows in a standard manner. At this limit the soil possess low shear strength.

How is plastic limit calculated?

Record the difference between the wet and dry weights as the weight of moisture. Calculate the plastic limit wp by dividing the “weight of moisture” by the “dry weight of sample” and multiply by 100. Plasticity Index (Ip) of a soil is the numerical difference between its Liquid Limit and its Plastic Limit.

What is plastic limit test?

Plastic limit test is one of the laboratory tests used internationally to differentiate or classify soils into groups. … The boundary of soil between the plastic and solid state means, the limit at which the soil starts to behave as a plastic.

What is Atterberg limit test?

Atterberg limits tests establish the moisture contents at which fine-grained clay and silt soils transition between solid, semi-solid, plastic, and liquid states.