ASTM C-39 Standard Test Method for Compressive Strength of
Cylindrical Concrete Specimens and ASTM C-617Standard Practice for Capping
Cylindrical Concrete Specimens
Compressive Strength of Cylindrical Concrete Specimens
Part-3. ASTM C39/AASHTO T22
*Scope*
This test method covers determination of compressive
strength of cylindrical concrete specimens such as molded cylinders and drilled
cores. It is limited to concrete having a density in excess of 800 kg/m3 [50
lb/ft3]. The program requires a working knowledge of the following ASTM test
methods and practices.
Referenced Documents.
• C31/C31M Practice
for Making and Curing Concrete Test Specimens in the Field
• C42/C42M Test Method for Obtaining and Testing Drilled
Cores and Sawed Beams of Concrete
• C192/C192M Practice for Making and Curing Concrete Test
Specimens in the Laboratory
• C617 Practice for Capping Cylindrical Concrete Specimens
• C670 Practice for Preparing Precision and Bias Statements
for Test Methods for Construction Materials
• C873 Test Method for Compressive Strength of Concrete
Cylinders Cast in Place in Cylindrical Moulds
• C1077 Practice for Laboratories Testing Concrete and
Concrete Aggregates for Use in Construction and Criteria for Laboratory
Evaluation
• C1231/C1231M Practice for Use of Unbonded Caps in
Determination of Compressive Strength of Hardened Concrete Cylinders
• E4 Practices for Force Verification of Testing Machines
• E74 Practice of Calibration of Force-Measuring Instruments
for Verifying the Force Indication of Testing Machines.
The results obtained by this test method should serve as a
guide in, but not as the sole basis for, selection of a chemical-resistant
material for a particular application. No attempt has been made to incorporate
in the test method all the various factors which may affect the performance of
a material when subjected to actual service.
This is not a test
for permeability and the test results are not to be interpreted as a
measurement of, or indication of, the permeability properties of the materials
tested.
As per IS 516, test specimens cubical in shape shall be 15×15×15 cm. If the largest nominal size of the aggregate does not exceed 2 cm, 10 cm cubes may be used as an alternative. Cylindrical test specimens shall have a length equal to twice the diameter. They shall be 15 cm in diameter and 30 cm long. Smaller test specimens shall have a ratio of diameter of specimen to maximum size of aggregate of not less than 3 to 1, except that the diameter of the specimen shall be not less than 7.5 cm for mixtures containing aggregate more than 5 percent of which is retained on IS Sieve 480.
The cylindrical mould shall be of 150mm diameter and 300mm height conforming to IS: 10086-1982*. The mould and base plate shall be coated with a thin film of mould oil before use, in order to prevent adhesion of the concrete.
The ends of all cylindrical test specimens that are not plane within 0.05mm shall be capped. Capped surfaces shall not depart from a plane by more than 0.05mm and shall be approximately at right angles to the axis of the specimens.Capping shall be of neat cement or sulphur or hard plaster.
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