The first prestressed 24-foot highway pavement in U.S.A. has six-inch slabs from 400 to 760 feet long between transverse steel bulkhead doweled joints. Twelve 1/2-inch 7-wire strands were post-tensioned at both ends of each slab to 29,000 pounds in three steps. The 200-psi longitudinal prestress prevented transverse cracks at early age. A double layer of polyethylene on the cement-treated base reduced friction. Studies of slab movements gave friction coefficients of about 0.5 for the daily frictional restraint stresses. In three slabs, the strands were in steel tubing, grouted after prestressing; in three, the prefabricated tendons were greased and plastic encased strands. Having the strands one-half inch below mid-depth prevented slab lift at the ends. Controlled tests with 10-and 17-ton axle loads before opening the road revealed foundation consolidations under initial axle loads. The highest load stresses were under wheels at pavement and joint edges.
Prestressed Concrete Highway Pavement at Dulles International Airport: Research Progress Report to 100 Days
1973
123 pages
Report
Keine Angabe
Englisch
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