Abstract:
A METHOD WAS EVOLVED BY WHICH BITUMINOUS-CONCRETE MIXTURES COULD BE MOLDED IN THE FIELD LABORATORY, INTO CYLINDRICAL SPECIMENS 2 IN. IN HEIGHT AND 4 IN. IN DIAMETER, HAVING A DENSITY APPROXIMATELY EQUAL TO THAT OBTAINED IN A PAVEMENT PRODUCED FROM THE MIX AND WITH APPROXIMATELY THE SAME AGGREGATE DEGRADATION. THE NECESSARY EQUIPMENT IS A SIMPLE DEVICE TO BE USED IN CONJUNCTION WITH A HYDRAULIC PRESS FOUND IN MOST FIELD LABORATORIES. THE MOLDING PRINCIPLE EMPLOYS GYRATORY SHEARING ACTION OF THE MIX AT LOW INITIAL PRESSURES, ALLOWING ORIENTATION OF THE AGGREGATE PARTICLES. THIS IS FOLLOWED BY DIRECT COMPRESSION AT 1,590 PSI. THE PROCEDURE IS MOST SATISFACTORY AND WAS USED AS A ROUTIERES LEADS TO A FINER DISTINCTION BETWEEN FILLERS STANDARD AND BECAME A PART OF THE SPECIFICATION REQUIREMENTS ON ALL BITUMINOUS-PAVING MIXTURES. THIS PAPER ALSO DESCRIBES A LATER ADAPTATION OF THE GYRATORY MOLDING METHOD IN PRODUCING SPECIMENS 4 IN. IN DIAMETER AND 8 IN. IN HEIGHT FOR TRIAXIAL TESTING. /AUTHOR/ EMPHASIZED TOGETHER WITH THE NEED FOR FREQUENT CONTROLS OF THE FILLER IN CRUSHED SAND. WHEN LARGE HAS MANY ADVANTAGES OVER PORPHYRY, SLAG OR FLY-ASH
Supplemental Notes:
Vol 31, pp 253-288, 14 TAB, 42 PHOT, APP. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
