Laboratory Manual of Bituminous Materials for the Use of Students in Highway Eng

Cover Laboratory Manual of Bituminous Materials for the Use of Students in Highway Eng
Laboratory Manual of Bituminous Materials for the Use of Students in Highway Eng
Prvost Hubbard
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Harder as distillation progresses, or, hi other words, the penetration of these residues decreases with distillation. For a given type of residue the penetration, therefore, decreases as the specific gravity increases. ' This relation is not, however, so marked in the case of blown products, which may decrease markedly in penetration with very slight change in specific gravity as the blowing process progresses. In comparing different types of materials there is no definite relation between pene...tration and specific gravity. Thus an asphalt cement of a given penetra- tion produced by straight distillation of a California petroleum will usually show a much lower specific gravity than will one of the same penetration from a Mexican petroleum or by flux- ing a native asphalt. Highly blown asphalt cements may usu- ally be identified by a very low specific gravity as compared 56 MELTING OR SOFTENING POINT TESTS with residual and fluxed native asphalts of the same penetration. Thus the penetration test, while practically valueless alone as a means of identification, owing to the fact that almost any type of material can be manufactured at any desired penetra- tion, may be a valuable aid to identification when considered in connection with the specific gravity of the material.

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