What is ASTM D7012?
ASTM D7012-13 – Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures.
How do you calculate uniaxial compressive strength of a rock?
The unconfined compressive strength of the specimen shall be calculated by dividing the maximum load (peak failure load) carried by the specimen during the test, by the average original cross sectional area.
How is UCS rock calculated?
The UCS of the specimen is calculated by dividing the maximum load carried by the specimen during the test, by the average cross sectional area.
What is uniaxial compression test?
uniaxial compression test. a method to determine the short-term strength of rocks; conducted by employing a constant loading rate until failure; the failure load is used to calculate the failure stress; can also be used to determine the elastic constants of rocks (i.e. Young’s modulus, Poisson’s ratio).
What is the ASTM standard for specific gravity?
ASTM D792 test is used for the determination of the specific gravity (relative density) and density of solid plastics in the form of sheets, rods, tubes, or molded items. Specific gravity means a measure of the mass ratio of a given substance volume at 23 °C of the same deionized water volume.
What is the size of tensile test specimen according to ASTM?
Specimens for ASTM D638 are dumbbell-shaped with either a 25 mm or 50 mm gauge length; a 50 mm gauge length is recommended.
How is UCS value calculated?
The Unconfined Compressive Strength is calculated as
- Initial Area Of Specimen (A0) = π4D02.
- Change in Length or Deformetaion △L = Dail Reading in mm.
- Axial Strain (∈ ) = △LL0.
- Load (Kg) = Proving Ring Reading * Proving Ring Constant.
- Corrected Area = A01−∈cm2.
- Stress (δ ) = LoadCorrected Area Kg/cm2.
What is UCS value?
A typical stress-strain diagram deriving from a Uniaxial Compression Test of an undisturbed specimen of basalt is presented in Figure 1. The UCS is the peak value of the diagram and is equal to 44.7 MPa.
How is UCS test done?
Testing Procedure
The two plates shall be carefully cleaned before the specimen is placed in the testing chamber. The load should be continuously applied at a rate of 0.5 MPa/s to 1.0 MPa/s (in case of a stress-controlled load device) and failure must occur in approximately 10 minutes.
What is UCS strength?
The uniaxial compressive strength (UCS) is the maximum axial compressive stress that a right-cylindrical sample of material can withstand before failing. It is also known as the unconfined compressive strength of a material because confining stress is set to zero.
What is difference between density and specific gravity?
Density is defined as mass per unit volume. It has the SI unit kg m-3 or kg/m3 and is an absolute quantity. Specific gravity is the ratio of a material’s density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m-3). It is therefore a relative quantity with no units.
How do you perform a density test?
Density Testing – YouTube
What is the formula for gauge length?
Specimens are said to be proportional when the gauge length, L 0, is related to the original cross sectional area, A 0, expressed as L 0 =k√A 0 . The constant k is 5.65 in EN specifications and 5 in the ASME codes.
How is tensile strength measured?
Tensile strength is often referred to as ultimate tensile strength and is calculated by dividing the peak tension force the sample withstands by its cross sectional area. A tensile tester is used to measure tensile strength. A load cell is fitted to the tensile tester to measure tensile force.
Why UCS test is done?
The primary purpose of the Unconfined Compression Test is to quickly determine a measure of the unconfined compressive strength of rocks or fine-grained soils that possess sufficient cohesion to permit testing in the unconfined state.
Why is UCS tested for concrete?
UCS Test – Unconfined Compressive Strength is a famous laboratory test to determine the compressive strength of a rock specimen. This test is only applicable on cohesive soils, which include clay or cemented soils. UCS test provides an approximate value of cohesive strength of soil in terms of total stresses.
What is the unit of specific gravity?
It has the SI unit kg m-3 or kg/m3 and is an absolute quantity. Specific gravity is the ratio of a material’s density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m-3). It is therefore a relative quantity with no units.
What factors affect specific gravity?
Specific gravity varies with temperature and pressure; reference and sample must be compared at the same temperature and pressure or be corrected to a standard reference temperature and pressure. Substances with a specific gravity of 1 are neutrally buoyant in water.
How do you calculate compaction?
3.7 Calculate percent relative compaction by dividing the dry density of the material from the test site by that material’s moisture density relation curve’s maximum dry density, and multiply by 100%.
How do we calculate dry density?
Calculate the dry density using the following equation: Dry Density (pcf) = Wet Density (pcf) – Moisture Content (pcf). 9.1. Report the moisture content of the soil to the nearest 0.1 percent and the moisture content of aggregate base materials to the nearest 0.1 pound per cubic foot.
What is the unit for elongation?
Ultimate elongation is the percentage change in length from original to rupture. Modulus is the force at a specific elongation value, ie 100% or 300% elongation. Expressed in pounds per square inch (psi) or megapascals (MPa), modulus is most widely used for testing and comparison purposes at 100% elongation.
What is elongation formula?
Elongation = ɛ = (ΔL/L) x 100
Elongation at Break is measured in % (% of elongation vs. initial size when break occurs).
What is ASTM standard for tensile test?
ASTM D638 is the most common testing standard for determining the tensile properties of reinforced and non-reinforced plastics. With the use of plastics being at an all-time high, it is critical that manufacturers be able to properly gauge the mechanical strength of their materials.
What is the procedure of tensile test?
A material is gripped at both ends by an apparatus, which slowly pulls lengthwise on the piece until it fractures. The pulling force is called a load, which is plotted against the material length change, or displacement. The load is converted to a stress value and the displacement is converted to a strain value.
What is the size of UCS Mould?
Two-Part Compaction Mold Assemblies are used in Unconfined Compressive Strength testing of remolded cohesive soil specimens. Mold Assemblies are available in sizes ranging from 1.4 to 6in (35.6 to 152.4mm).