SUCTION RESPONSES DUE TO NOMOGENEOUS SHEAR OF DILUTE MONTORILLONITE-WATER PASTES

A RECENTLY DESCRIBED PHENOMENON, THE SHEAR INDUCED DECREASE OF MOISTURE SUCTION IN SATURATED CLAY-WATER SYSTEMS AND ITS SUBSEQUENT RECOVERY, HAS BEEN INVESTIGATED WITH THE AID OF A PARALLEL PLATE SHEARING DEVICE. THE APPARATUS ALLOWED A MORE QUANTITATIVE DESCRIPTION OF THE PHENOMENON THAN WAS PREVEIOUSLY POSSIBLE. IN 4-6 PERCENT NA-MONTMORILLONITE PASTES IT DEMONSTRATED A WELL DEFINED SUCTION RESPONSE TO SHEAR EVEN FOR SHEAR ANGLES AS SMALL AS ONE DEGREE. THE OBSERVED DESCREASE IN SUCTION WAS RAPID AT FIRST. IT TERMINATED WITHIN A FEW MINUTES AND WAS FOLLOWED BY AN APPROXIMATELY EXPONENTIAL, OCCASIONALLY INCOMPLETE RECOVERY. ALL THE TESTS CARRIED OUT EXHIBITED THE SAME GENERAL FEATURES OF SUCTION CHANGE. IT IS POSTULATED THAT SHEAR INDUCES A DISPLACEMENT OR CHANGE IN CONGIGURATION OF PARTICLES AND THAT SUBSEQUENTLY THEY RETURN TO THEIR ORIGINAL STATES DUE TO THERMAL MOTION. THE SHAPES OF THE RECOVERY CURVES CAN BE INTERPRETED IN TERMS OF THE RELAZATION SPECTRUM FUNCTIONS ENCOUNTERED IN LINEAR VISCOELASTICITY THEORY. BY UTILIZING A CHARACTERISTIC RELAXATION TIME FOR THESE SPECTRA, RATE PROCESS THEORY HAS

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 307-16
  • Serial:
    • Volume: 26

Subject/Index Terms

Filing Info

  • Accession Number: 00237379
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 11 1994 12:00AM