Sampling for Strength of Concrete Sample Clauses

Sampling for Strength of Concrete. A random sampling procedure shall be adopted to ensure that each concrete batch shall have a reasonable chance of being tested that is, the sampling should be spread over the entire period of concreting and cover all mixing units. The minimum frequency of sampling of concrete of each grade shall be in accordance with the following: Quantity of Concrete in the Work, m3 Number of samples 31 – 50 4 51 and above 4 plus one additional sample for each additional 50 m3 or part thereof. Note: At least one sample shall be taken from each shift. Where concrete is produced at continuous production unit, such as ready-mixed concrete plant, frequency of sampling may be agreed upon mutually by suppliers and purchasers. Three test specimens shall be made for each sample for testing at 28 days. Additional samples may be required for various purposes such as to determine the strength of concrete at 7 days or at the time of striking the formwork, or to determine the duration of curing, or to check the testing error. Additional samples may also be required for testing samples cured by accelerated methods as described in relevant IS code. The specimen shall be tested as described in relevant IS code. The laboratory test results shall be tabulated and furnished to the Engineer. The test results of the sample shall be the average of the strength of three specimens. The individual variation should not be more than  15 percent of the average. If more, the test results of the sample are invalid.
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