What is the swell index?

The swell index which is the slope of the rebound curve of void ratio versus the logarithm of the effective pressure curve is used to estimate the consolidation settlement of over-consolidated fine grained soils.

What is DFS soil?

DFS test is a very essential and major test in soil. Do you know. Differential Free Swell (DFS) test is conducted as per IS: 2720 (Part XL) – 1977. In this test the free swell index of a soil sample is determined which helps to identify the potential of a soil to swell.

Which fluid is used in Free Swell Index test?

Take two 10gm soil specimen of oven dry soil passing through 425 micron IS Sieve. Pour each of the specimen in each of the two glass graduated cylinders of 100ml capacity. Fill one cylinder with kerosene oil and the other with distilled water upto the 100ml mark.

What is free swelling index of coal?

The free-swelling index (FSI) is a measure of the increase in volume of coal when heated under specified conditions (ASTM D720; ISO 335). The FSI method is a small-scale test for obtaining information regarding the free-swelling properties of a coal.

What is importance of swelling index?

The swell index test procedure is used to determine the general swelling characteristics of bentonite clay. The Swell Index test has not been demonstrated to have a proportional correlation to hydraulic properties, a high swell is considered by most to be a good indicator of bentonite quality.

What is FSI test in soil?

Free swell is the increase in volume of a soil, without any external onstraints, on submergence in water. The possibility of damage to structures due to swelling of expensive clays need be identified, at the outset, by an investigation of those soils likely to possess undesirable expansion characteristics.

What is plastic limit and liquid limit?

• The Liquid Limit (LL) is the moisture content at which a fine-grained soil no longer flows like a liquid. • The Plastic Limit (PL) is the moisture content at which a fine-grained soil can no longer be remolded without cracking.

What is swelling pressure?

objective. The expansive clays increase in their volume when they come in contact with water owing to surface properties of these clay types. The pressure which the expansive soil exerts , if it is not allowed to swell or the volume change of the soil is arrested , is known as Swelling Pressure of Soil.

What is plastic limit?

Plastic limit is defined as the water moisture content at which a thread of soil with 3.2mm diameter begins to crumble.

What is LTGK of coal?

Low Temperature Gray King Coke Type (LTGK) [10]: The purpose of the test is to assess the caking properties of a coal or a blend of coals and the yield of the various by- products by carbonization in a laboratory under standard conditions at a maximum temperature of 600°C.

What do you mean by swelling power?

BACKGROUND- Bentonite. is a natural, colloidal, hydrated aluminium silicate that has been processed to remove grit and non-swelling components of the ore. It is under the category of pharmaceutical aid.