NATURAL ASPHALT DEPOSITS THROUGHOUT THE WORLD

NATURAL ASPHALT IS EXTRACTED IN THE FORM OF ROCK. ASPHALTIC ROCKS ARE LIMESTONE OR SANDSTONE WHICH ARE NATURALLY IMPREGNATED WITH SOLUBLE BITUMEN IN COMMON ORGANIC SOLVENTS. THE BITUMEN CONTENT IS USUALLY APPROXIMATELY 8 TO 9 PERCENT, BUT IT CAN VARY ACCORDING TO THE DEPOSIT AND THE BANKS WITHIN THE SAME DEPOSIT BETWEEN 2.5 AND 16 PERCENT. BITUMENS FOUND IN ASPHALTIC ROCKS ARE, IN FACT, OXIBITUMENS, HIGHLY VISCOUS OR SOLID SUBSTANCES AT ORDINARY TEMPERATURES, WHICH RESULT FROM THE OXIDATION AND POLYMERIZATION OF CRUDE PETROLEUM. TWO HYPOTHESES ARE ACCEPTED REGARDING THE OXIBITUMEN IMPREGNATION OF ASPHALTIC ROCKS: EITHER THE PETROLEUM WHICH INITIALLY IMPREGNATED THE ROCK SUBSEQUENTLY POLYMERIZED AND OXIDIZED IN THE ROCK, OR THE ROCK WAS IMPREGNATED WITH PETROLEUM ALREADY TRANSFORMED INTO BITUMEN. ASPHALTIC LIMESTONE IS A ROCK OF MEDIUM HARDNESS WHICH MUST BE BLASTED. BITUMEN IMPREGNATION MAKES THIS ROCK VERY DIFFICULT TO BREAK INTO SMALL FRAGMENTS AND BLASTING MUST BE CAREFULLY CARRIED OUT AS NOT TO OBTAIN TOO LARGE BLOCKS. A LIST IS GIVEN OF THE MAIN ASPHALT DEPOSITS IN THE WORLD, THEIR GEOGRAPHICAL POSITION, GEOLOGICAL ORIGIN, ROCK CHARACTERISTICS, GRADING, AND PROPERTIES OF NATURAL BITUMEN. GUIDELINES FOR WORKING AND MANUFACTURING OPERATIONS ARE APPENDED. /IRRD-IRF/

  • Corporate Authors:

    Rev Techn Batim Construc Industr /Fr

    ,    
  • Authors:
    • Geoffroy, J
  • Publication Date: 1971-1

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 35-56
  • Serial:
    • Issue Number: 22

Subject/Index Terms

Filing Info

  • Accession Number: 00211292
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 23 1974 12:00AM