THE USE OF PUMICE FOR LOW CLASS ROADS

A STUDY WAS UNDERTAKEN TO INVESTIGATE THE ENGINEERING CHARACTERISTICS OF VOLCANIC PUMICE AND HOW THE MATERIAL CAN BEST BE UTILIZED FOR FOREST ACCESS ROAD CONSTRUCTION. BOTH UNTREATED AND STABILIZED PUMICE WERE INVESTIGATED. PRELIMINARY OBSERVATIONS INDICATE THAT PUMICE HAS ABOVE AVERAGE STRENGTH AND BEARING CAPACITY CHARACTERISTICS WHEN USED AS BASE AND SUBGRADE MATERIAL, BUT ABRADES AND DUSTS BADLY WHEN USED AS A WEARING SURFACE. AS A RESULT, PUMICE IS NORMALLY NOT USED AS A WEARING COURSE FOR HIGH TRAFFIC VOLUME ROADS. BEING ABLE TO DETERMINE ECONOMICAL METHODS OF IMPROVING THE PROPERTIES OF PUMICE FOR USE AS A SURFACE COURSE WOULD BE EXTREMELY BENEFICIAL, AS MUCH OF CENTRAL OREGON IS COVERED WITH A MANTLE OF PUMICE. A LITERATURE REVIEW AND A LOCAL FIELD INVESTIGATION IN OREGON WERE MADE TO DETERMINE CURRENT USE AND CONSTRUCTION PRACTICE WITH PUMICE. A TEST WAS SELECTED ON THE WINEMA NATIONAL FOREST AND THE PUMICE WAS SAMPLED FOR LABORATORY TESTING. BASED ON THE LABORATORY TEST RESULTS, SIX TEST SECTIONS WERE INCORPORATED IN THE TEST ROAD. OVER A PERIOD OF 18 MONTHS THE CLAY AND LIME-TREATED SECTIONS APPEARED TO PERFORM THE BEST. THE CEMENT PERFORMED ALMOST AS WELL; HOWEVER, THE ASPHALTIC SECTIONS FAILED IN MOST CASES DUE TO INADEQUATE CURING. IN ALL CASES THE TREATED SECTIONS PERFORMED BETTER THAN THE UNTREATED PUMICE. /AUTHOR/

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Filing Info

  • Accession Number: 00233218
  • Record Type: Publication
  • Report/Paper Numbers: pp 63-64
  • Files: TRIS
  • Created Date: Apr 17 1972 12:00AM