Pursuant to our assignment, continuation issuing from the meeting of March 29, 1967, with Messers Brunnhoeffer, Mathis, et al, the Research Division staff performed specific-gravity tests on an ensemble of gravel samples furnished by Mr. Mays and made further evaluations of those and other data available -- that is, for the purpose of deriving the best or most judicious unit weights -- with a minimum of areal and mineralogical differentiation. Because of previously recognized variances in pavement densities, we elected to proceed on a theoretical basis. On the basis of assumed volume constants, it was possible to calculate theoretical unit weights. The real (measured) values of O.D., bulk, specific gravity and absorption were used in calculating the theoretical, unit weights for the respective aggregates.

Report Date


Report Number

No. 249

Digital Object Identifier