THE REAL REASON FOR ROCK BREAKDOWN

CONTRARY TO WHAT MOST PEOPLE THINK, IN MANY VARIETIES OF ROCK, WATER FREEZING IN THE PORES IS NOT THE REASON FOR THE DETERIORATION AND BREAKDOWN OF THE ROCK. WATER THAT DOES NOT FREEZE IS THE CHIEF CAUSE, ACCORDING TO RESEARCH CARRIED OUT AT RENSSELAER POLYTECHNICAL INSTITUTE. THERE, A TEAM OF GEOLOGISTS HAS FOUND THAT THE LESS ICE THAT FORMS IN PROPORTION TO THE TOTAL WATER PRESENT IN THE MAJORITY OF THE ROCKS TESTED, THE MORE SENSITIVE THE ROCKS ARE TO DISINTEGRATION. CERTAIN ROCK DETERIORATION IS DUE SIMPLY TO ALTERNATE WETTING AND DRYING ACCOMPANIED BY TEMPERATURE CHANGES. THE CAUSE OF THE TROUBLE SEEMS TO BE THE CLAY MINERALS IN THE ROCKS. EXPERIMENTS INDICATED THAT ONLY A SMALL PORTION OF THE WATER IN THE ROCKS FROZE, AND THAT IT FROZE IN A SINGLE FREEZING PULSE AT TEMPERATURES OF -7C TO -12C. IT WAS FURTHER SHOWN THAT THE WATER WHICH DID NOT FREEZE WAS ADSORBED WATER. THE CONCLUSION WAS REACHED THAT ROCKS ARE TORE APART BY THE CONSTANT ORDERING AND DISORDERING OF THE INTERNAL WATER AS A RESULT OF TEMPERATURE CHANGES. /AUTHOR/

  • Supplemental Notes:
    • Vol 33, No 8, PP 71-72
  • Corporate Authors:

    Construction Magazine

    ,    
  • Publication Date: 1966-4

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Filing Info

  • Accession Number: 00234020
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 1994 12:00AM