PROPERTIES OF PAVEMENT CONCRETE HARDENING: UNDER DRY AND WARM CLIMATIC CONDITIONS /IN RUSSIAN/

THE TECHNIQUE DEVELOPED BY MADI IS DESCRIBED FOR PREVENTING THE OCCURRENCE OF DISORDERS DURING THE CONCRETING OF ROAD SURFACINGS UNDER DRY AND WARM CLIMATIC CONDITIONS (TEMPERATURE 60 DEGREES C, HUMIDITY 10 PER CENT). THE METHOD CONSISTS IN ADDING TO THE CONCRETE A LARGE PROPORTION OF CALCIUM LIGNOSULPHONATE PLASTICIZER (0.5 PER CENT INSTEAD OF THE USUAL 0.2 PER CENT OF THE CEMENT WEIGHT), AND 5 PER CENT GYPSUM. THESE ADDITIONS SHOULD RESULT IN IMPROVED WORKABILITY FOR LONG ENOUGH TO ENABLE LAYING TO PROCEED SATISFACTORILY. A STUDY WAS MADE OF THE INFLUENCE OF THE ADMIXTURES ON THE MECHANICAL STRENGTH AND DEFORMATION OF THE TREATED CONCRETE UNDER NORMAL CURING CONDITIONS, AND UNDER DRY AND WARM CLIMATIC CONDITIONS. ONE TABLE AND THREE GRAPHS PRESENT THE STUDY RESULTS. THE CONCLUSIONS REACHED ARE AS FOLLOWS: IF CONCRETE IS PROTECTED FROM EVAPORATION FOR A MINIMUM OF 14 DAYS, IT HAS A HIGHER STRENGTH THAN THE SAME CONCRETE CURED AT 20 DEGREES C IN A SATURATED ATMOSPHERE. THE RETARDED SETTING AND HARDENING EFFECTS OF THE PLASTICIZERS ARE NEUTRALIZED BY THE CURING TEMPERATURE, ADDITION OF GYPSUM, AND REVIBRATING. FOR CONCRETE OF EQUAL STRENGTH, DEFORMATION PROPERTIES DO NOT DEPEND ON ADMIXTURES OR TREATMENT. /LCPC/RRL/

  • Supplemental Notes:
    • Vol 31, No 7, PP 18-19, 3 FIG, 1 TAB, 1 REF
  • Authors:
    • Shestoperov, V S
    • Popolov, A C
    • Khalmykhamedov, S
  • Publication Date: 1968-7

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Filing Info

  • Accession Number: 00212913
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Sep 28 1970 12:00AM