ADHESION IN SET PORTLAND CEMENT

A STUDY OF THE ADHESION BETWEEN SET PORTLAND CEMENT AND AGGREGATES WAS CARRIED OUT BY MEASURING THE POTENTIALS OF AGGREGATES TOWARDS CEMENT AS IT SETS, THE CHARGE FLOW AT THE BREAK OF THE BOND AND THE BOND STRENGTH, AND THE IGNITION LOSS, HEAT OF SOLUTION, AND HEAT OF HYDRATION OF PORTLAND CEMENT AND OF THE FILM OF CEMENT ADHERING ON THE SURFACE OF AGGREGATES. PARALLEL MEASUREMENTS WERE TAKEN, AS FAR AS PRACTICABLE, WITH TWO ORGANIC ADHESIVES - ARALDITE AND POLYVINYL ACETATE. THE NATURE OF THE ADHESION BOND BETWEEN SET CEMENT AND AGGREGATES IS PROPOSED TO BE A DONOR TYPE BOND. WHEN SET CEMENT ADHERS TO MILD STEEL, IT APPEARS THAT A THIN FILM OF SUCH CEMENT IS FORMED AT THE INTERFACE AND THIS FILM HAS PROPERTIES DIFFERENT FROM NORMALLY SET CEMENT. THE FILM STICKS FIRMLY ON THE STEEL SURFACE, AND DURING BREAK WHAT IS OBSERVED IS THE COHESIVE BREAK BETWEEN THIS FILM AND THE MASS OF SET CEMENT. THUS THE MEASURED BOND STRENGTH DOES NOT REPRESENT THE TRUE ADHESIVE BOND BETWEEN MILD STEEL AND SET CEMENT. /RRL/A/

  • Availability:
  • Supplemental Notes:
    • Vol39, No8, PP320-323, 2FIG, 2TAB, 3REF
  • Authors:
    • Chatterji, A K
    • Maitreya, V K
  • Publication Date: 1965-8

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00212196
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Feb 2 1994 12:00AM