RETEMPERING OF PROLONGER-MIXED CONCRETE WITH ADMIXTURES IN HOT WEATHER

The effect of water-reducing, and water-reducing and retarding admixtures on prolonged-mixed concrete at 30 C (86 F) was studied over a range of dosages. Loss of slump during mixing (for 1 or 2 hr), and the total mixing water required for regaining the initial slump of 10 cm (4 in.) after retempering, were measured. Results show that while loss of slump was higher (compared with the reference concrete) with the admixtures, the total mixing water after retempering was less. At the recommended dosage of admixtures, the differences in both parameters were very small and so were the differences in compressive strength. At higher dosages, however, a pronounced reduction in the total mixing water was observed, with a parallel significant increase in strength. /Author/

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  • Accession Number: 00126481
  • Record Type: Publication
  • Report/Paper Numbers: No 72-23
  • Files: TRIS
  • Created Date: Dec 16 1975 12:00AM