ADMIXTURES-THE ESSENTIAL FIFTH COMPONENT FOR DURABLE CONCRETE?

THE EFFECT OF ADMIXTURES ON THE DURABILITY OF CONCRETE IS CONSIDERED. ADMIXTURE MANUFACTURERS CLAIM THAT THE WORKABILITY OF CONCRETE CAN BE MAINTAINED WHEN MADE AT LOWER WATER CEMENT RATIOS THAN NORMAL, IF A PLASTICISER IS USED RESULTING IN A DENSER AND STRONGER CONCRETE. THE EFFECT OF ADMIXTURES ON THE DURABILITY OF CONCRETE IS MEASURED USING THE INITIAL SURFACE ABSORPTION TEST (ISAT) AND THE ACCESSIBLE PORE SIZE DISTRIBUTION. THE RESULTS ARE ILLUSTRATED GRAPHICALLY AND ANALYSED. THEY INDICATE THAT CEMENT REDUCTIONS OF 10%, FOR MIXES CONTAINING AN ADMIXTURE AND INITIALLY 300KG CU.M CEMENT, DO NOT AFFECT THE DURABILITY. A SUGAR REDUCED CALCIUM LIGNOSULPHONATE SOLUTION CONTAINING AN AIR DETRAINING AGENT IS THE ADMIXTURE USED. READY-MIX PLANT TRIALS INDICATE NO LOSS OF 28 DAY STRENGTH FOR CONCRETE WITH AN ADMIXTURE AND 10% LESS CEMENT. THE ARTICLE CONCLUDES THAT DURABLE CONCRETE NEEDS ADEQUATE CEMENT BUT THE CEMENT SHOULD BE USED EFFECTIVELY. THIS CAN BE ACHIEVED BY SPECIFYING THE USE OF A PLASTICISER IN CONJUNCTION WITH A STRENGTH REQUIREMENT AND/OR A MINIMUM CEMENT CONTENT.

Media Info

  • Features: Figures;
  • Pagination: p. 30-33
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00081721
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM