UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 704 ¢ 
Contribution feu the Bureau of Public Roads 
LOGAN WALLER PAGE, Director 
Washington, D. C. PROFESSIONAL PAPER. August 30, 1918 
TYPICAL SPECIFICATIONS FOR NONBITUMINOUS 
ROAD MATERIALS. 
By Prevost HuBBArD, Chemical Engineer, and 
FRANK H. JACKSON, Jr., Assistant Testing Engineer. 
CONTENTS. 
Page. Page 
ATT EROCMICEL OMe eee eta ete ee eerste 1 | Methods of selecting and shipping samples... 35 
SPECI CALTOMSEN a yu aene ee seni Mune reel Ln mine 4 | Detailed table of contents.................-.- 39 
Methodslofitestingis eas aes eee ee 27 | Index of materials and use................... 40 
INTRODUCTION. 
This publication should be considered as a companion bulletin to 
“Typical Specifications for Bituminous Road Materials.”? In it 
are given a number of typical specifications for the more common 
nonbituminous materials used in the construction and maintenance 
of various types of highways. These are grouped mainly according 
to type of road. Im so far as practicable materials of the same class 
have also been kept together. When a single type of road requires 
more than one class of nonbituminous material peculiarly suited to 
that class, all of the materials are treated in the same specification 
under appropriate subheadings. Thus in specification RC-2, where 
the requirements for coarse aggregate for concrete base are the same 
for broken stone or gravel, these materials have been specified to- 
gether. Also in specifications such as RBC-2, for bituminous con- 
crete, all of the nonbituminous constituents, including broken stone, 
sand, and filler, are included. 
Baie the summer of 1917 a survey was made of stone quarries 
in certain sections of the country? with the primary object of ob- 
taining data relating to the commercial sizes of broken stone, which 
would Senable the Bureau of Public Roads to recommend a minimum 
> U: S. Department of Agriculture Bulletin 691. 
“ Public Roads,” vol. 1, No. 2, June, 1918. 
