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UNIT] 3D STATES DEPARTMENT OF AGRICU 
Ti i 1921 ^k 
Contribution from the Bureau of Pubic Roads 
THOMAS H. MacDONALD, cieX: 
Washington, D. C. 
October 10, 1921 
STANDARD AND TENTATIVE METHODS 
OF SAMPLING AND TESTING 
HIGHWAY MATERIALS 
Recommended by the 
SECOND CONFERENCE OF STATE HIGHWAY TESTING ENGINEERS 
AND CHEMISTS 
Washington, D. C, February 23 to 27, 1920 
CONTENTS 
Page 
Introduction 1 
Tests- for Nonbituminous Road Ma- 
terials 3 
Tests for Bituminous Road Materials . . 36 
Tentative Tests 62 
Page 
Recommended Standard Methods of 
Sampling 69 
Miscellaneous Matter 75 
Forms for Recording and Reporting Re- 
sults . ,♦ • • • 79 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1921 
