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41.3 Stone aggregates :147Dy.Ex. Engr.41.3.1 Quality : The aggregates shall be obtained by crushing approved stonesof specified type in a mechanical crusher and shall be clean, strong, tough, dense,durable, close grained and free from soft, decayed and weathered portions and fromcoating of dust, dirt or other objectionable matter. They shall preferably have goodhydrophobic characteristics They shall generally satisfy the following requirements.For light or mediumtrafficFor heavy trafficLos Angles abrasion test, percentfines maximumAggregate crushing test, percent,fines maximumWater absorption by weight after24 hours immersion , percent, notmore than25 1723 171 1Test shall be carried out according to I.S. 383-1970.Test considered necessary shall be carried out in an approved laboratory when theEngineer considers quality to be doubtful or there is dispute about the quality. If theresults are satisfactory, the cost of tests shall be borne by the Department and ifunsatisfactory by the contractor.Rd 41.3.2 Size : Size of the metal and chips shall be as under :Standard sizeWholly passing throughSquare mesh of internaldimensionWholly retained onsquare mesh of internaldimension.40 mm. ( about 1.5") 50 mm. ( about 2" ) 25 mm. ( about 1" )22 mm. ( about 1") 40 mm. ( about 1.5") 20 mm. (about 0.75")20 mm. ( about 0.75") 25 mm. ( about 1") 12 mm. (about 0.50")12 mm. ( about 0.05") 20 mm. ( about 0.75") 10 mm. (about 0.75")10 mm. ( about 0.75") 12 mm. ( about 0.50") 6 mm. (about 0.25")6 mm. ( about 0.25") 10 mm. ( about 0.75") 5 mm. (about 3/16")Note : Not more than 20% of any sample shall exceed in its greatestdimension , standard size plus 25 mm, for 40 mm. standard size and standard sizeSignature of Contractor No. of corrections Executive Engineer