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  • [ N/A ]
    Öğe
    The effect of sulphate on length change of concrete
    (Estonian Academy Publishers, 2007) Oymael, S.
    Sulphates usually affect calcium aluminates in cements. Sulphate ions might have negative effects on cement hydration and it would be a reason of decrease in cement strength. In this study, the effects of Na2SO4 solution on the concretes made from OPC with oil shale ash (OSA) addition (0, 15 and 30%) were investigated Concretes with 15% OSA gave the lowest value of Length Change Factor (LCF). Addition of an optimum amount of super-plasticizer increases positive properties of the concrete with 15% OSA addition, binds free Ca(OH)(2) in OPC, makes its composition more effective, prevents massive alkali-aggregates reactions showing that this addition rate is proper.
  • Küçük Resim
    Öğe
    Metal concentrations in blue crab (Callinectes sapidus) and mullet (Mugil cephalus) in Iskenderun Bay, northern east Mediterranean, Turkey
    (Springer, 2006) Turkmen, A.; Turkmen, M.; Tepe, Y.; Mazlum, Y.; Oymael, S.
    [Abstract Not Available]
  • Küçük Resim
    Öğe
    Suitability of oil shale ash as a constituent of cement
    (Estonian Academy Publishers, 2007) Oymael, S.
    Physical and chemical characteristics of ashes formed at burning oil shale at temperatures 500, 600, 700, 800, 900 and 1030 degrees C were studied. Standard procedures were used to determine both pozzolanic activity and binding parameters. The most suitable characteristics were provided with oil shale ash formed at 700 degrees C. Ashes (15 and 30%) were added to ordinary Portland cement. The optimum pozzolanic characteristics and performances were provided by the mixture containing 15% ashes. The mixes meet the corresponding Turkish standards, and therefore, this oil shale call be used as all admixture in Portland cement.