Laboratory Testing

Soil Testing

Sieve Analysis:A sieve analysis (or gradation test) is a practice or procedure used to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass.

Specific Gravity:The specific gravity of a given material is defined as the ratio of the weight of a given volume of the material to the weight of an equal volume of distilled water. In soil mechanics, the specific gravity of soil solids is an important parameter for calculation of the weight-volume relationship.

Rock Testing

Unconfined Compressive Streght:The unconfined compressive strength (UCS) is the maximum axial compressive stress that a right-cylindrical sample of material can withstand under unconfined conditions.

Brazilian Tensile Strength:A method for the determination of the tensile strength of rock by applying a load vertically at the highest point of a test cylinder or disk, which is itself supported on a horizontal plane.

Cerchar Abrasive Index: The CERCHAR Abrasivity Test is a method to determine an index called CERCHAR Abrasivity Index (CAI) for the rock's abrasivity. The test measures the wear on the tip of a steel stylus having a Rockwell Hardness of HRC 55. A rock specimen, disc-shaped or irregular, is firmly held in the test apparatus. The stylus is lowered carefully onto the rock surface. While under a normal force of 70 N, the stylus is moved a total distance of 10.0 mm across the rock. The wear surface of the stylus tip is measured under a microscope to an accuracy of 0.01 mm

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