OCR Text |
Show Information Sought on Strength of Hard Roads Actual stresses in concrete rond slabs and subgrade conditions beneath i are to be investigated in many states by the bureau of public roads of the United States Department of Agriculture. Agricul-ture. A truck Is now being equipped with suitable apparatus, including graphic strain guages and an autographic auto-graphic defleatometer especially developed de-veloped for the purpose. Data to be collected will include soil and moisture condition of the subgrade, design of slnb, direction and magnitude of stresses, and deflection of slab under legal limit of loadings as well as other londings. Some of the southern states will be visited first. Valuable Information should be secured as to the strength of different types of design. |