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. 494 ii) The nominal size if the coarse aggregate for reinforced concrete work shall be 20mm. Larger coarse aggregate upto 40mm size may be used if approved by the Engineer, in plain concrete work. The maximum size of coarse aggregate shall be as large as possible within the limits specified but in no case shall be greater than one quarter of the minimum thickness of the member, provided that the concrete can be placed in form work without difficulty so as to surround all reinforcement thoroughly and to fill the corners of the form work. The minimum size of coarse aggregate shall be, as mentioned earlier, such as to retain most of the material (90% - 95%) on I.S. Sieve No.480. iii) The aggregate shall be screened and, if necessary, blended to Sieve Size give the required grading when tested in the laboratory at Contractors cost by means of standard mesh sieve, the grading shall fall within the following limits. Percentage retain by weight Plain C.C. R.C.C. 40 mm -- -- 25 mm 10 to 15 -- 20 mm 35 to 40 15 to 0 10 mm 75 to 80 100 to 80 No.480 98 to 100 100 to 95 The percentage given above are for guidance and the Engineer reserves the right to modify the same to any other lower or higher value if considered necessary by him. In consolance with the requirements of the work.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 495 iv) In the event of undesirable segregation occurring in coarse aggregates, the contractors shall separate the coarse aggregates in two or more suitable fraction as directed by the Engineer, who shall set up the required limit of each such fraction. The grading so specified shall be such as to give a dense, water tight concrete of specified proportion and strength and required consistency. v) The Engineer shall have the right and authority to carry out routine control tests and analysis of the broken rock at any stage of the work processing and/or concreting operation and the contractors shall give all necessary facilities in respect of such testing. The sampling and testing shall be carried out as per Standard I.S. practice entirely at the cost of the contractor. e) Water The water used for the preparation of concrete, for washing sand etc. and for curing shall be clean and free from objectionable quantities of silt, organic material, acid, alkali, salts, oil and other deleterious impurities and it shall be obtained from the sources approved by the Engineer. Potable water shall generally be found fit for preparation of concrete. The quantity of water to be added shall generally be properly measured and controlled. iii) Water cement ratio Suitable water cement ratios for the different mixes and used shall be determined in consultation with the Engineer and they shall generally not be exceeding 0.5 (i.e. 50% by weight), the exact values being fixed after taking into account all relevant factors such as strength required, weather condition, water absorbed by material, work ability and slump required consistent with the work requirements, methods of compaction etc.
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