UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 314 
Contribution from Office of Public Roads and Rural Engineering 
LOGAN WALLER PAGE, Director 
Washington, D. C. PROFESSIONAL PAPER December 10, 1915 
METHODS FOR THE EXAMINATION OF 
BITUMINOUS ROAD MATERIALS 
By 
PREVOST HUBBARD, Chemical Engineer, and 
CHARLES S. REEVE, Chemist 
CONTENTS ; 
, Page 
Classification of Materials Bitumen Soluble in Carbon Disulphide . 
Scheme of Examination ee Bitumen Insoluble in Paraffin Naphtha . 
Specific Gravity Determination . 2 Bitumen Insoluble in Carbon Tetra- 
Specific Viscosity Determination chlorides ithe sites tie et ence 
Float Test eeee @ &©& &© @ 8 Fixed Carbon ©) 6a ale Ve) es Viep e 
Penetration Test . ParaffinSeale. . 2. « « © « « » 
Melting Point Determination . . Extraction of Bituminous Aggregates 
Flash and Burning Points . Grading the Mineral Aggregate . . 
Volatilization Test . . . . 5 Voids in the Mineral Aggregate . . 
Distillation Test. . ... 4 Bituminous Emulsions . 
Dimethy! Sulphate Test . fs Appendix 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1915 
ae yee Wie 7 a a i a ae rn a i ati oo 
