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Home| Questions|Q 72262
Answered
Oliva Jones
Oliva Jones
Asked: June 21, 20222022-06-21T23:16:42+05:30 2022-06-21T23:16:42+05:30In: Highway Engineering

Write quality-controlled operations involved in bituminous concrete construction.

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      Vipin Chauhan Professional
      2022-06-22T00:31:56+05:30Added an answer on June 22, 2022 at 12:31 am
      • The samples of coarse aggregates collected for construction of dense graded bituminous mix are subjected to specified tests in the laboratory to decide the suitability.
      • The grading of the coarse and fine aggregates for the dense-graded mix is checked.
      • The voids in the mineral aggregates (VMA) of the dense-graded mix are checked.
      • A sample of selected bitumen binder is subjected to the specified tests.
      • The binder content of the mix is checked at a rate of one set per 400 tonnes of mix or a minimum of two tests per day by conducting a bitumen extraction test.
      • The temperature of the binder in the boiler, the aggregate mix in the dryer, and the bituminous mix during laying are checked at regular intervals.
      • After the mix is spread, the rate of spread or average thickness of the layer is checked after the fifth truckload.
      • The density of the compacted layer is checked at a rate of spread or the average thickness of the layer is checked after every fifth truckload.
      • The density of the compacted layer is checked at a rate of one set per 700 m2
      • After the final rolling of 300 m stretches, the surface finish is checked using a 3 m straight edge to find the depth of depressions and their number along with the longitudinal and transverse profile.
      • After completing the construction of a substantial length of the road stretch, the unevenness index or roughness index is measured using a calibrated bump integrator, along the wheel paths of each lane, in the case of BC surface, the average value of the unevenness index shall not exceed 2000 mm/Km length of the highway.
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