[KI-.I 
UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 691 
Contribution from the Office of Public Roads and Rural Engineering 
LOGAN WALLER PAGE, Director 
Washington, D. C. 
July 10, 1918 
TYPICAL SPECIFICATIONS 
FOR BITUMINOUS ROAD MATERIALS 
By 
PREVOST HUBBARD, Chemical Engineer, and 
CHARLES S. REEVE, Chemist 
CONTENTS 
Page 
Introduction 1 
Specifications ......... > » '' • . . 4 
Methods of Testing . . 47 
Samples and Sampling ,....,.,,,. 58 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1918 
