CALIFORNIA BEARING RATIO TEST

OBJECTIVE

To determine the California bearing ratio by conducting a load penetration test in the laboratory. 

NEED AND SCOPE

The california bearing ratio test is penetration test meant for the evaluation of subgrade strength of roads and pavements. The results obtained by these tests are used with the empirical curves to determine the thickness of pavement and its component layers. This is the most widely used method for the design of flexible pavement.

CONSOLIDATION TEST

OBJECTIVE

To determine the settlements due to primary consolidation of soil by conducting one dimensional test. 

NEED AND SCOPE

The test is conducted to determine the settlement due to primary consolidation. To determine :

1. Rate of consolidation under normal load.

UNDRAINED TRIAXIAL TEST

OBJECTIVE

To find the shear of the soil by Undrained Triaxial Test.

 NEED AND SCOPE OF THE TEST

The standard consolidated undrained test is compression test, in which the soil specimen is first consolidated under all round pressure in the triaxial cell before failure is brought about by increasing the major principal stress.

It may be perform with or without measurement of pore pressure although for most applications the measurement of pore pressure is

UNCONFINED COMPRESSION TEST

OBJECTIVE

determine shear parameters of cohesive soil

NEED AND SCOPE OF THE EXPERIMENT

It is not always possible to conduct the bearing capacity test in the field. Some times it is cheaper to take the undisturbed soil sample and test its strength in the laboratory. Also to choose the best material for the embankment, one has to conduct strength tests on the samples selected. Under these conditions it is easy to perform the unconfined compression test on undisturbed and remoulded soil sample. Now we will investigate experimentally the strength of a given soil sample.

 PLANNING AND ORGANIZATION

DIRECT SHEAR TEST

Objective

To determine the shearing strength of the soil using the direct shear apparatus. 

NEED AND SCOPE

In many engineering problems such as design of foundation, retaining walls, slab bridges, pipes, sheet piling, the value of the angle of internal friction and cohesion of the soil involved are required for the design. Direct shear test is used to predict these parameters quickly. The laboratory report cover the laboratory procedures for determining these values for cohesionless soils. 

Vane Shear Test

OBJECTIVE 
To find shear strength of a given soil specimen.
NEED AND SCOPE

The structural strength of soil is basically a problem of shear strength.
Vane shear test is a useful method of measuring the shear strength of clay. It is a cheaper and quicker method. The test can also be conducted in the laboratory. The laboratory vane shear test for the measurement of shear strength of cohesive soils,
is useful for soils of low shear strength (less than 0.3 kg/cm²) for which triaxial or unconfined tests can not be performed. The test gives the undrained strength of the soil. The undisturbed and remoulded strength obtained are useful for evaluating the sensitivity of soil.