Road building in the desert which occupies most of Western Rajasthan is difficult because the only construction material available locally is fine dune sand, and other aggregates and materials must be hauled from distant locations. Precast concrete blocks have recently been tested for full-scale highways in the Rajasthan area because they can be placed directly on the subgrade for quick and easy construction. In addition, the blocks can be cast at a central location on a repetitive basis under factory controlled conditions, can be readily replaced if a block is damaged, and have a high salvage value if the road is abandoned or relocated. The blocks are six-sided, measuring 56 centimeters along each side, and are cast in a hollow form with six interior ribs for reduction of weight. They are fastened together with dowels through hollow sleeves in the faces of the block. Edge blocks, used along the sides of the highway, are five-sided with four 56-centimeter sides and one 96 centimeter side. The precast block system is not suitable for use in curved highways, although such situations are uncommon in desert highways. Conventional paving techniques would be used in these limited situations. Comparision of initial costs show that the new pavement system is quite competitive with conventional flexible and rigid pavements. The Central Road Research Institute of New Delhi, India, which tested the block system, recommends the development of a small truck-mounted crane to expedite the placing of the blocks, and a heavy plate vibrator to seat the block efficiently in the subgrade sand.

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  • Accession Number: 00310755
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM