supply of materials for balance work of type- b block-2, 12 nos residential building at fire station atarra at district banda ( u.p. ) -2 supply of coarse sand at site shall be clean sharp and free from clay , loam , organic or any other foreign matter , shall be obtained from approved source . the supplier shall get the sample of coarse sand approved by the engineer - in -charge . sand which in the opinion of engineer-in-charge oh his or his reprensentative , if dirty must be washed to his satisfaction at the cost and expenses of the supplier coarse sand shall pass through a mess 475 mm sq. measured in true clear . sand shall not be used for concreate works if it contains more than 10% of fine grains passing through a 76 mess seive should be finess modules be less than 2.25unless specific permission is obtained from the engineer-in-charge. 3 supply of 20 mm gauge stone grite at site approved stone grit from stone chips of stone ballast for cement concreate ( plain of reinforced ) shall be hard of uniform and fine textures free from 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 . stones of black and hard variety as is generally available from quarries in kabrai area will be normally used stones aggregates from other places may also be used provided the same is found suitable in the opinion of the engineer-in-charge must be recorded in writing . the ballast or chip sahll be obtained by breaking from large blocks and must be more or less cubical in shapes . stone grit grading shall be in conformity with requirement laid down in the indian standard specification. 4 supply of 40 mm gauge stone ballast at site approved stone ballast from stone chips of stone ballast for cement concreate ( plain of reinforced ) shall be hard of uniform and fine textures free from 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 . stones of black and hard variety as is generally available from quarries in kabrai area will be normally used stones aggregates from other places may also be used provided the same is found suitable in the opinion of the engineer-in-charge must be recorded in writing . the ballast or chip sahll be obtained by breaking from large blocks and must be more or less cubical in shapes . stone grit grading shall be in conformity with requirement laid down in the indian standard specification. 5 supply of brick at site shall be of approved quality of standard specification , made of good brick earth , uniform deep red , cheery or copper colour , thoroughly burnt in kiln without being vitrified , regular in shape and size , sound , hard , homogeneous in texture , true to shape and of standard dimension and shall be free from craks , chips , flaws , stones of humps of any kind and shall not show appreciable signs of efforescence either dry or subsequent to saoking in water . brick shall measure 230*115*75 mm to a tolerence upto +- 5 mm in length +- 3 mm width and +- 2 mm in thickness shall be permitted . a frog 6 mm deep shall be provided on the upper face . the brick shall emit a clear ringing sound on being struck and have minimum crushing strength of 150 kg / sqcm. all the bricks which absorb water more than 20% of their own dry weight after 24 hours immersion in cold water shall be rejected. 6 supply of pozolana portland cement at site as per isi code 1489-2015 ( prism / birla / acc / mysem ) every bag shall be deemed to contain 50 kg of cement . the suppliers may liable to submit test report. 7 supply of tor steel at site in different sizes ( such as 8 mm to 25 mm ) as directed by the engineer-in-charge.the suppliers may liable to submit test report. 8 gst extra as per applicable