supply of material for extension of state council of educational research and training building at nishatganj, lucknow supply of material for extension of state council of educational research and training building at nishatganj, lucknow , laying and jointing pvc pipe. heading , supply of bricks shall be of approved quality of standard specifications, made of good brick earth, uniform deep red, cherry or copper colour, thoroughly burnt in kiln without being vitrified, regular in shape andsize, sound, hard, homogeneous in texture, true to shape and of standard dimension and shall be free form cracks, chips, flaws, stones or humps of any kind and shall not show appreciable signs of efflorescence either dry or subsequent to soaking in water.bricks shall measure 230x115x75 mm a tolerance upto ± 6mm in length ± 3 mmwidth and± 2 mm in thickness shall be permitted. a frog 6 mm deep shall be provided on the upper face. the bricks shall emit a clear ringing sound on being struck and have minimum crushing strength of 150 kg. / sq.cm. all the bricks which absorb water more than 20% of their own dry weight after 24 hours immersion in cold water shall be rejected. , supply of pozonolla portland cement as per isi code 1489-2015 ( prism, birla, acc. jaypee or equivalent ) every bag shall be deemed to contain 50 kg. of cement. the suppliers may liable to submit the test report . , supply of coarse sand shall be clean sharp and free from clay, loam, organic or any other foreign matter, shall be obtained from approved source. the contractor shall get the sample of coarse sand. approved by the engineer-in-charge.sand which in the opinion of the engineer-in-charge or his representative is dirty, must be washed to his satisfaction at the cost and expenses of the contractor coarse sand shall pass through a mesh, 4.75 mm. square measured in the clear. sand shall not be used for concrete works if it contains more than 10% of fine grains passing through a 76 mesh sieve. should the fineness modulus be less than 2.25 unless specific permission is obtained from the engineer-in-charge. , supply of 20mm guage approved stone grit from stone chips or stone ballast for cement concrete ( plain or reinforced ) shall be hard, of uniform and fine texture.free form faults or planes of weakness and free from weathered faces. the ballast or chips must be free from loam, clay or any surface coating, free from organic matter or other impurities and screened, free of dust. stone of black and hard variety as is generally available from quarries in kabrai areas will be normally used. stone aggregates from other sources may also be used provided the same is found suitable in the opinion of the engineer-in-charge. the opinion of engineer-in-charge must be recorded in writing. the ballast or chips shall be obtained by breaking from large blocks and must be more or less cubicle in shape stone grit grading shall be in conformity with the requirements laid down in the indian standards specification is : 383-1963 as shown below percentage passing for single sized aggregate of nominal size. 40mm passing 100% 20mm passing85-100% 10mm passing 0-20% 4.75 mm passing 0 - 5% , supply of 40mm guage approved stone ballast for cement concrete ( plain or reinforced ) shall be hard, of uniform and fine texture.free form faults or planes of weakness and free from weathered faces. the ballast or chips must be free from loam, clay or any surface coating, free from organic matter or other impurities and screened, free of dust. stone of black and hard variety as is generally available from quarries in kabrai areas will be normally used. stone aggregates from other sources may also be used provided the same is found suitable in the opinion of the engineer-in-charge. the opinion of engineer-in-charge must be recorded in writing. the ballast or chips shall be obtained by breaking from large blocks and must be more or less cubicle in shape stone grit grading shall be in conformity with the requirements laid down in the indian standards specification is : 383-2016 as shown below percentage passing for single sized aggregate of nominal size. 63mm passing 100% 40mm passing85-100% 20mm passing 0-20% 10 mm passing 0 - 5% , gst extra as per rule applicable