A COMPREHENSIVE METHOD FOR THE CHEMICAL ANALYSIS OF HARDENED CONCRETE

THE METHOD DESCRIBED IS INTENDED TO GIVE THE AGGREGATE- CEMENT RATIO AND WATER-CEMENT RATIO FOR AN UNKNOWN CONCRETE WITH REASONABLE ACCURACY. IT IS BASED UPON THREE MAIN CONSTITUENTS, SOLUBLE SILICA, SOLUBLE CALCIUM OXIDE, AND INSOLUBLES, WHILE THE LOSS ON INGNITION AND CARBON DIOXIDE CONTENTS ARE USED FOR CORRECTIVE PURPOSES. THE METHOD REQUIRES NO KNOWLEDGE OF THE MATERIAL USED FOR THE CONCRETE ALTHOUGH SUCH KNOWLEDGE FACILITATES THE ANALYSIS. IT CONSISTS OF TOTAL ANALYSIS OF THE CONCRETE COMBINED WITH A THERMAL DECOMPOSITION GIVING TWO AGGREGATE FRACTIONS AND ONE CEMENT FRACTION. THESE FRACTIONS ARE USED FOR CORRECTING THE ANALYSES OF THE AGGREGATE AND THE CEMENT, I.E. THE AGGREGATE ANALYSIS IS CORRECTED FOR CEMENT PRESENT IN THE AGGREGATE FRACTION AND THE CEMENT ANALYSIS IS CORRECTED FOR AGGREGATE PRESENT IN THE CEMENT FRACTION. THE METHOD GIVES TWO SETS OF FINAL RESULTS, ONE IS BASED UPON SOLUBLE SILICA OR SOLUBLE CALCIUM OXIDE THE OTHER IS BASED UPON INSOLUBLE MATTER COMBINED WITH LOSS ON IGNITION. IT IS RECOMMENDED TO CONSIDER THE LOWEST CEMENT CONTENTS AND THE HIGHEST AGGREGATE CONTENTS AS THE CORRECT RESULT, AS EXPERIENCE HAS SHOWN THAT ONE USUALLY GETS TOO HIGH CEMENT CONTENTS AND TOO LOW AGGREGATE CONTENTS IN THIS TYPE OF ANALYSIS. ALTHOUGH THIS METHOD IS INTENDED TO BE USED FOR TOTALLY UNKNOWN CONCRETES, IT MUST BE EMPHASISED THAT ALL ADDITIONAL DATA ABOUT THE AGGREGATE, CEMENT, ETC. SHOULD BE USED AS FAR AS POSSIBLE. THIS WILL NOT ONLY MAKE THE ANALYSIS EASIER AND FASTER TO PERFORM, BUT IT WILL ALSO MAKE THE RESULTS MORE ACCURATE.

  • Corporate Authors:

    European Cement Association /France

    ,    
  • Publication Date: 1970-9

Language

  • English

Media Info

  • Features: Figures;
  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214363
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM