What is ASTM C1231?
ASTM C1231/C1231M-08a – Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders.
What is the maximum number of reuses for a neoprene pad used with compressive strengths of 8000 psi?
Neoprene Pads flow during compression to fill irregularities in the cylinder ends and assure load uniformity. Pads are economical and can be reused for up to 100 tests.
What is the unit of machine loading rate that need to be calculated from the stress rate in compressive strength measurement?
pound-force per square inch
The compressive strength is calculated from the failure load divided by the cross-sectional area resisting the load and reported in units of pound-force per square inch (psi) in US Customary units or megapascals (MPa) in SI units.
What is ASTM C39?
ASTM C39 determines the compressive strength of cylindrical concrete specimens such as molded cylinders and drilled cores. It is limited to concrete having a unit weight in excess of 50 lb/ft3 (800 kg/m3). The results of this test method are used as a basis for quality control of concrete.
Why is compressive strength test important?
Compressive strength is one of the most important properties of concrete and mortar. The strength of the binder (cement) therefore has a significant effect on the performance characteristics of the mixture and ensures the overall quality of the finished product.
What is the normal range of compressive strength for concrete?
between 25 and 50 MPa
The compressive strength of normal concrete varies between 25 and 50 MPa. Above this level, the term High Performance Concrete is used.
When should you break concrete cylinders?
Under ACI and CSA Standards, a break is considered to be low when an individual compressive strength test (average of two cylinders) is more than 500 psi below the specified strength or if the average of three consecutive sets of tests does not equal or exceed the specified strength.
What is ASTM 90?
ASTM E90: Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements.