Show Rubber Road Testing Program Enters Final Stretch Salt Lake City Building roads with rubber is the current problem prob-lem being undertaken by the Utah State Road Commission engineers. en-gineers. In recent months the material designers and laboratory labora-tory technicians of the Commission's Commis-sion's testing laboratory have been busy on research and experiments ex-periments with various types of rubber and asphalt combinations to determine the best formula to be used with .'-vailable local aggregates. ag-gregates. Hundreds of samples have been run and tested under the most rigid control to simulate actual specifications and construction. con-struction. The engineers now feel that a road test itself is the only way to tell how such rubber as- i phalt paving as they have designed de-signed will perform over the long haul and under the pounding of heavy traffic and changing weather. wea-ther. The commission has authorized they laying of such a comparative compara-tive test strip on U. S. Highway 40 at 4th and 5th South Streets between 7th and 11th East in Salt Lake City with alternate sections sec-tions of rubber asphalt and regular reg-ular asphalt. |