REPORT OF COOPERATIVE SERIES OF TESTS ON ACCELERATORS

IN TABLES INDICATING THE RELATIVE STRENGTHS OBTAINED AT THE DIFFERENT AGES FROM THE MIXTURES CONTAINING THE ACCELERATORS. IT IS CONCLUDED THAT THE BENEFICIAL EFFECTS OF THE ACCELERATORS ARE CONFINED TO THE EARLY AGES UNDER THE PRESCRIBED LABORATORY CONDITIONS OF CURING AND STORAGE. UNDER THESE CONDITIONS THE EFFECT OF THE CALCIUM CHLORIDE IS TO ACCELERATE THE HYDRATION OF THE CEMENT MARKEDLY DURING THE FIRST FEW DAYS, BUT THE RESULTING GAIN IN STRENGTH LARGELY DISAPPEARS AT THE 28-DAY PERIOD AND THEREAFTER. RELATIVE STRENGTH OF THE MORTARS CONTAINING THE ACCELERATORS AFTER THE 28-DAY PERIOD ARE SLIGHTLY HIGHER THAN THOSE OF THE CONCRETES AND OF THE PLAIN MORTARS FOR THE LATER PERIODS. DATA OBTAINED SUGGEST THAT THE ACCELERATION OF HARDENING IS PROBABLY DEPENDENT EITHER UPON THE PROPORTION OF CALCIUM CHLORIDE TO THE CEMENT, OR THE CONCENTRATION OF CALCIUM CHLORIDE IN THE GAGING LIQUID. CALCIUM CHLORIDE IS MORE EFFECTIVE UNDER DRY CURING THAN MOIST CURING.

  • Supplemental Notes:
    • No 23, Part 1, PP 223-229
  • Publication Date: 1923

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  • Accession Number: 00212686
  • Record Type: Publication
  • Source Agency: Engineering Construction
  • Files: TRIS
  • Created Date: Jul 29 2004 5:33PM