particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 496 45.1 CONCRETE All cement concrete, whether used in R.C.C. work or plain concrete work shall M-150, M-200 and M-250 as per latest I.S. code. 45.2 CONTROL AND TESTING OF CONCRETE Following tests shall be carried out at the site whenever required by the Engineer in accordance with I.S. 516 (latest). a) Works Tests – 7 days and 28 days compressive strength test. b) Consistency Test c) Moisture contents in aggregates d) Unit weight of concrete a) Work Tests During concreting operation, samples of concrete as placed in the work shall be taken every day and a set of six cubes of cylinder shall be made therefrom for being tested for their compressive strength, the consistency (slump) test shall also be made and slump required. All concrete cubes or cylinders shall be tested for compressive strength as specified under I.S. 456 and 516 at the CIDCO laboratory generally as per specifications under the latest I.S. 456 and 516. The above specification cover concrete mixes of grades M-150 and above. Ordinarily it is not necessary to test the compressive strength of mix of grade M-150 at it is generally used for non-structural purposes. However, where the mix M-150 is used extensively on works (i.e. more than 75% cu.mt. of concrete is to be placed at one time in any work), it shall be tested in the same manner as other grades
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 497 of concrete used for structural purposes. The minimum strength of various grade of concrete both at the age of 7 days and 28 days are as per I.S. specifications. In the case of concrete of mix M-150 and above, the Engineer may not insist on the testing of concrete if the quantity of concrete to be laid on any particular day is less than 10 cu.m. If, however, the quantity excess 10 cu.m. test specimens must invariably, be taken and sent to the CIDCO laboratory for testing. Specimen shall be made for every sample and three of them tested for 7 days strength. As mentioned earlier, the 28 days strength of concrete shall alone form the criteria for acceptance or rejection of the concrete samples shall be tested both for 7 days strength as well as 28 days strength at the start of the work and this shall be continued until the Engineer is satisfied that a proper relation between the 7 days compressive strength and 28 days compressive strength is established, in which case he may decide to relax the frequency of testing the concrete cubes for the 28 days compressive strength. If the average of strength of the specimen tested at the age of 7 or 28 days is not less than the strength specified in I.S. specifications, the tests shall be considered satisfactory, subject to the condition that only one out of three consecutive test may give a value less than the specified strength but not less than 90% of the specified strength. If the tests are unsatisfactory,
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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