BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

Fineness Modulus offine aggregate 2.3 - 2.4 2.3-2.4 1.8Applicable to Foundation, Trenches, LevellingColumn, slab, drain-channel,beam, wallcorner stone,pile, road,ductspavement17.6.3 TESTSIn order to control the quality of concrete to be placed, samples of concrete fortesting shall be taken and cubes made as and when directed by the Board. Testsshall be done in accordance with this Specification or equivalent Standardsapproved by the Board.a. Slump testb. Compression testC. Air testFor each grade of concrete, six test cylinders conforming to ACI or equivalentshall be prepared for each 30 cubic meters of concrete in each day's work. Threecylinders shall be tested on the 7th day and the remaining three on the 28th day.The slump and compression tests shall be carried out and the results shallsubmitted to the Board in written form.The cost of preparing, storing and transporting test specimens to the place oftesting and testing shall be borne by the Contractor.17.6.4 CEMENTAll cement shall be of normal Portland cement complying with BSTI or otherapproved standard. When required by the Board, the Contractor shall obtain forhim the manufacturer's test certificate prior to any delivery. All cement shall bestored dry in a well-ventilated and weatherproof building. The cement shall befurnished either in bulk or in bags from the cement factory approved by theBoard.17.6.5 ADMIXTUREThe Contractor may use water-reducing and set-retarding agents, but the use ofadmixture must have the prior approval of the Board.17.6.6 WATERThe water used for making concrete, mortar and grout shall be clean, fresh andfree from injurious amounts of oil, organic-matter or any other deleterioussubstance.17.6.7 AGGREGATEThe fine and coarse aggregates shall be durable, non-reactive hard materialscomplying with internationally accepted standards approved by the Board. AllGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)169