The Dumpers shall be covered with tarpaulins while carrying the mix to the site.Īlso, Read: Granular Sub Base Construction and Quality Control.Dumpers used for the hauling of Asphalt mixture shall be adequately free of petroleum oils, solvents, or other materials that adversely affect the Asphalt mixture.Bituminous Mixes shall be kept free of contamination and segregation during transportation.Discharge temperature of dense bituminous macadam mix shall be 165☌ maximum.
The mixing shall be thorough to ensure that a homogeneous mixture is obtained.The difference in temperature between the binder and the aggregate does not exceed 14☌. The Aggregates shall be heated to mix within the temperature range of 150☌ to 170☌.The Bitumen shall be heated in the range of 150☌ to 165☌ as it can be distributed uniformly.HMP shall have automatic controls that coordinate the mixer proportioning, timing and discharge.The mixing cycle times shall be in the range of 30 to 40 seconds. The minimum mixing period shall be adopted to get an appropriate mix.Bitumen shall be heated to the specified temperature in the tanks and delivered to the mixing plant via insulated pipes to minimise heat losses.
They shall be equipped with a thermostat to prevent temperatures from rising above 170☌, and a fixed thermometer quickly read from outside the tank. The storage Bitumen tanks shall be capable of maintaining their contents at the specified temperature within a tolerance of ±5☌.The rated capacity of the DBM mixing plant shall be 200 T/hr.It shall be capable of regulating the composition of the mixture to within the tolerances as specified in table 501.3 of MORTH concerning the approved job mix formula. The mixing plant shall be of batch-mix type.
Preparation of Dense Bituminous Macadam (DBM) Mix and Transportation:
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