Bitumens And Their Essential Constituents for Road Construction And Maintenance
Bitumens And Their Essential Constituents for Road Construction And Maintenance
Prvost Hubbard
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So much confusion exists among road engineers and others in- terested in bituminous road binders concerning the meaning of cer- tain terms as applied to these materials that" it has seemed advisable to present in brief form the definitions of such terms as at present used by the United States Office of Public Roads. It should be un- derstood, however, that these definitions are at present more or less arbitrary, owing to wide differences of opinion held by those who are considered authorities o...n the subject of bitumens. Notwithstanding these facts, it is hoped that this circular will furnish highway en- gineers and other interested persons with a foundation for acquiring and systematically classifying further information along the lines herein indicated. To aid them in this matter a brief discussion of the value of the various materials used in road construction has been given in addition to the definitions. Acid Sludge. — A mixture of sulphonated hydrocarbons resulting from the treatment of bitumens with sulphuric acid; usually a waste or by-product obtained in this manner from the purification of tar and oil distillates.
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