The criteria for acceptance of compressive test for concrete are:

 1. Average strength: The average compressive strength of the three cubes should not be less than the specified characteristic strength.


2. Individual strength: No individual cube strength should be less than 80% of the specified characteristic strength.


3. Variation: The variation between the strengths of the three cubes should not exceed 15%.


4. Target mean strength: The target mean strength should be achieved, which is usually specified by the designer.


5. Standard deviation: The standard deviation of the strengths should be within acceptable limits, usually 5-10 MPa.


6. Number of tests: A minimum number of tests should be conducted, usually 3-6 cubes per test.


7. Test frequency: Tests should be conducted at regular intervals, usually weekly or fortnightly.


8. Testing age: Tests should be conducted at the specified age, usually 28 days.


9. Testing method: Tests should be conducted in accordance with the specified testing method, usually IS 516 or ASTM C39.


10. Equipment calibration: The testing equipment should be calibrated and certified.


Note: These criteria may vary depending on the project specifications, local regulations, and industry standards.



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