UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 704 , 



\Sir Contribution from the Bureau of Public Roads "Vfih 



-'*->.^ 



^\^V*^^ LOGAN WALLER PAGE, Director 



Washington, D. C. PROFESSIONAL PAPER. August 30, 1918 



TYPICAL SPECIFICATIONS FOR NONBITUMINOUS 

 ROAD MATERIALS. 



By Peevost Hubbard, Chemical Engineer, and 



Fbank H. Jackson, Jr., Assistant Testing Engineer. 



CONTENTS. 



Introduction 1 



Specifications 4 



Methods of testing 27 



Page. 

 Methods of selecting and shipping samples. . . 35 



Detailed table of contents 39 



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. In 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. 



During the summer of 191T 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 enable the Bureau of Public Roads to recommend a minimum 



ITT. S. Department of Agriculture Bulletin 691. 

 2 " Public Roads," vol. 1, No. 2, June, 1918. 



