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138Dy.Ex. Engr.b) The base on which bituminous courses are to be laid must be dry andfree of dust and other delirious matters.c) Mineral aggregates to be used should be checked for theirspecifications, requirements and got approved by the Engineer.46 BITUMINOUS SPRAYED WORK:a) Temperature of binder in the boiler and rate of spray at site shall bechecked. Spraying shall be uniform and shall be carried out with the help of theeither self propelled or towed bitumen pressure sprayer with self-heatingarrangements and spraying nozzles arrangements.b) Rate and uniformity of spread of chippings should be checked andcontrolled.c) Adequate embedment of the chippings by rolling shall be ensured.47. HOT MIXED AND HOT LAID BITUMINOUS CONSTRUCTIONS:a) Job mix formula (JMF) satisfying specification requirements should beworked out based on laboratory tests and got approved by the Engineer. TheEngineer will have independent tests made before approving the JMF.b) The plant should be checked for capability to produce mix conforming tothe JMF If necessary, trial stretches should be laid and checked approximately.c) Control should be exercised on temperature of binder in the boiler,aggregate in the dryer and mix at the time of laying and rolling.d) Tests for stability flow, unit weight ,etc. of mix collected from thedischarge point of the plant, extraction test for binder content and aggregategradation should be performed to check on the quality of mix discharged fromthe plant.e) Thickness and density of compacted mix should be checked by takingcore samples.48 ACCEPTANCE CRITERIA:In addition to the stipulation in the specification of relevant items, the finishedsurface shall be checked with Roughometer for roughness values. The finishedsurface shall have a roughness value of not more than 2000 mm/Km. forbituminous concrete surface and 2500 mm/Km. for bituminous premix carpetsurface, when measured in accordance with M.O.S.T. Circular No.RW/NH/I11/8/10/64, dated 19/5/1984. Subsequent readings should be takenwithin 4-6 months after opening of the road to traffic or the defects liabilitySignature of Contractor No. of corrections Executive Engineer