Testing on Rock Samples
STS provides the services for following tests on rock samples
Unconfined Compression Test
Unconfined compressive strength test involves axially loading a cylindrical rock core sample to failure. The term unconfined is used because the lateral force on the sample is zero. The test are conducted on the compressive strength testing machine equipped with digital screen and load cell.
The specific gravity of a given material is defined as the ratio of the weight of a given volume of material to the weight of an equal volume of distilled water at standard temperature. It is denoted by Gs. This quantity is used for calculation of void ratio, in hydrometer test, degree of saturation and also weight-volume relationship.
Water absorption tests involves oven drying the soil samples and weighing them. The samples are then soaked in water for 12 hours. The samples are then weighed again to determine the water absorption of samples.
Point Load Test
In Point load tests, the rock samples are compressed between conical steel plates until failure. These tests are used to determine rock strength of rock cores or lump rock samples where the RQD of the rock samples is relatively low. Unconfined compressive strength tests are estimated through conversions and correlations.
Sodium Soundness Test
The soundness tests of aggregates are conducted in order to determine the resistance of aggregates to weathering. Aggregates are submerged in the solution. Due to the formation of salt crystals, the aggregates tend to break because of the forces created by crystals. The loss of material is determined by sieving after five cycles of submerging and drying.