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Civil Engineering Tests

Unconfined Compression Test

The unconfined compression test is a type of triaxial test in which the confining pressure is taken as zero. The test is onlybe conducted in clayey soil specimens which can stand without confinement because of this case. The test is generally performed on intact (non-fissured), saturated clay specimens. Although the test can be conducted in a triaxial test apparatus it is more convenient to perform it in an unconfined compression testing machine. There are two types of machines as described below:

1. Machine with a spring
In this type of testing machine a loaded spring is used. It consists of two metal cones which are fixed on horizontal loading plates supported on the vertical posts. The upper loading plate is fixed in position, whereas the lower plate can slide on the vertical posts. The soil specimen is placed between the two metal cones

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Consolidation Test of Soil

The consolidation test for soil samples is conducted in laboratory scale to determine the compressibility behavior of the soil specimen. The test is performed in the consolidation test apparatus, known as the consolidometer or an oedometer. Consolidometer consists of a loading device and a cylindrical container which is called as a consolidation cell. The soil specimen is placed in the consolidation cell between the top and bottom porous stones. The consolidation cells are of two types as follows:

1. Floating or free ring cell in which both the top and bottom porous stones are free to move. The top porous stone can move downward and the bottom stone can move upward as the sample consolidates.

Consolidation Test of Soil
Source: Soil Management India

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Elongation Index Test For Aggregates

AIM OF THE EXPERIMENT:
To determine the Flakiness Index of the given sample of course aggregate.

CODE OF REFERENCE:
• IS 2386(Part 1):1963 Methods of Test for Aggregates of Concrete- Particle Size and Shape. Reaffirmed Dec 2016
• ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat Elongated Particles in Coarse Aggregates, American Society for Testing and Materials.
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Laboratory Tests For Determination of Strength of Rocks

The following laboratory tests are commonly used for determination of the strength of rocks:
1. Unconfined compression test
2. Triaxial compression test
3. Splitting tension test
4. Beam bending test
5. Ring shear test

All these tests are briefly described as below:
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Direct Shear Test

AIM OF THE EXPERIMENT:
To determine the undrained shear strength of a sandy to silty soil.

CODE OF REFERENCE:
• IS 2720 (Part 13)- 1986 Methods of test for soils: (Part -13) Direct Shear Stress
• IS 2720 (Part 2)- 1973 Methods of test for soils: (Part -2) Determination of water content

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