Continuously Reinforced Concrete Roadbases

Paper by UNKNOWN from ISCR 9th 2004 Instanbul Turkey

In the Netherlands Rijkswaterstaat is the authority in charge among others of the construction of highways. The department Noord Holland of Rijkswaterstaat has chosen a continuously reinforced concrete roadbase for the construction of the 9 km long new highway section between the cities of Haarlem and Hoofddorp. This choise was based on the expectation that future maintenance works would be minimal, thus a higher initial investment being acceptable. The specification of the total construction from bottom to top is as follows: 1.00 m sand for bedding, 0.25 m cement granulate subbase, 0.06 m bituminous intermediate layer, 0.25 m pavement quality concrete slag and 0.05 m porous asphalt surfacing. The bituminous intermediate layer should prevent the cement bound subbase from erosion. The quality of the concrete is B35 characteristic, which means that 95 % of the test results have to be 35 N/mm² or higher. The reinforcement has been placed at mid-slab depth and consists of grade 500 deformed steel bars. The diameter of the longitudinal bars is 16 mm and 0.59 % of the crosssectional are of the slab, the diameter of the transverse bars is 12 mm at 700 mm centres and at 60º to the longitudinal bars.

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