GAIL (India) Limited

15Cement bags shall be stacked close together away from external walls and in stacks of not more than tenbags to avoid lumping under pressure.Cement stored during monsoons or cement expected to be in store for more than eight weeks shall becompletely enclosed in 700 micron polyethylene sheet so arranged that the flap closes on the top stack.The contractor shall ensure that protective polyethylene sheet is not damaged at any time during use.Consignments of cement shall be used in order of delivery A record shall be kept of the batch numbers ofcement deliveries in such a form that the part of the works in which the cement is used can be readilyidentified. If during delivery or by test, the cement is found to be defective, the same shall be returnedback forthwith.The contractor shall be responsible for the storage of cement at the site and no claim will be entertained inthe event of any damage occurring to cement due to faulty storage by the contractors or on account of hisnegligence.Cement stored on site for a period longer than eight weeks shall be tested to the satisfaction of theConsultant/Engineer-in-charge before it is used in the works. Cement that has failed the tests conductedshall not be used in the works and shall be remarked from the site immediate by without fail.3.8.2 STORING OF AGGREGATEAggregates shall be stored on a suitable well drained raft of concrete, timber, metal or other approvedmaterial. The storage of aggregates on the ground will not be permitted.Each size of aggregate shall be stored separately in such a manner as to prevent spillage and mixing ofone aggregate with an adjacent aggregate The dividing walls of any bin shall be of sufficient height andthe aggregate shall be so deposited that a distance of 100 mm shall be left between the top of the divisionwall and any part of the aggregate stackWhen stack piling, the aggregate shall not form pyramids resulting in segregation of different sizeparticles. The stacks shall be regular and of a height not exceeding two meters.3.9 Grades of ConcreteThe grades of concrete shall be in accordance with the following table. The grade of concrete to beused in each section of work will be shown in the drawings or in the Bill of Quantities:Grade of ConcreteCHARACTERSTIC STRENGTHCharacteristic strength i.e.compressive strength of 15 cm.Cubes at 28 days (N/mm2)10 10 2515 15 2520 20 2025 25 2030 30 2035 35 20Nominal maximumaggregate size (mm)