EFFECT OF MOISTURE CONTENT ON THE CREEP OF HARDENED CEMENT

DETAILS ARE GIVEN OF CREEP TESTS ON HARDENED CEMENT PASTE HAVING A 0.4 W/C RATIO. AFTER 28 DAYS OF HYDRATION, ALL THE SAMPLES WERE DRIED AT A TEMPERATURE OF 105 DEGREES C FOR TWO DAYS. LOADS, 20 PERCENT OF THE ULTIMATE LOAD, WERE APPLIED. THE WATER, TAKEN FROM THE AIR THE RELATIVE MOISTURE CONTENT OF WHICH IS LOWER THAN 40 PERCENT, IS ADSORBED BY THE SURFACE OF THE HYDRATION PRODUCTS, THUS RESULTING IN A DECREASE IN SURFACE TENSION. IN THE LESS MOIST ZONE, THE STRUCTURE OF THE GEL REMAINS UNCHANGED. THE PORE WATER AND THE WATER FROM THE CRYSTALS OF SOME OF THE HYDRATION PRODUCTS, WHICH HAD DISAPPEARED DURING DRYING, CAN BE AGAIN FIXED IN THE STRUCTURE BY HIGH MOISTURE CONTENT. THIS PROCESS IS THE CAUSE OF AN INCREASED CREEP DEFORMATION WHEN THE MOISTURE CONTENT IS HIGH. /TRRL/

  • Corporate Authors:

    Rheologica Acta, Munich /Germany

    ,    
  • Authors:
    • Wittmann, F
  • Publication Date: 1970

Media Info

  • Features: Figures; References;
  • Pagination: p. 282-7
  • Serial:
    • Volume: 9
    • Issue Number: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00213156
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Dec 4 1973 12:00AM