Write quality-controlled operations involved in bituminous concrete construction.
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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 theRead more
- 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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