ASTM C1231/C1231M-15 PDF Download
Standard EN
Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical Concrete Specimens
Also Known As:
The ASTM C1231/C1231M-15 standard provides guidelines for the use of unbonded caps in testing hardened concrete cylinders or cores.
The standard specifies that the unbonded capping system can be used as an alternative to the capping systems described in Practice C617. The elastomeric pads used in the unbonded caps are designed to deform and conform to the contour of the ends of the test specimens. They are restrained from excessive lateral spreading by plates and metal rings, ensuring a uniform distribution of load from the testing machine to the concrete or mortar specimens.
The standard also includes requirements for the unbonded caps. Unbonded neoprene caps of a defined hardness can be used for testing concrete cylinders without qualification testing up to a certain compressive strength level. Beyond that strength level, neoprene caps will require qualification testing. For other elastomeric materials, qualification testing is required regardless of the concrete strength. It is important to note that unbonded caps should not be used for acceptance testing of concrete with compressive strength below 10 MPa or above 80 MPa.
| Descriptors | test specimens, acceptance test, neoprene rubber,Chloroprene Rubber,Hardened Concrete,Acceptance Testing,Compressive Strength,Test Specimens and Test Engines |
| ICS Codes | 91.100.30 - Concrete and concrete products |
| Language(s) | English |
| File Size | 143.4 KB |
