جستجوی مقالات مرتبط با کلیدواژه "بهسازی بتن" در نشریات گروه "عمران"

Mineral additives are one of the used methods to prevent the decrease in strength of concrete against sulfate attack. In this paper, after identifying the characteristics and properties of Qotursui spa construction site, the effects of mineral additives (fly ash and micro-silica) on mechanical and durability parameters of the concrete specimens have been investigated before and after immersion in the Qotursuyi spa pool. Results showed that, in the improved samples with single component additives (e.g. micro-silica only) and two components, in the short-term cement type II and in the medium and long-term cement type V has been resulted greater compressive strength and durability. Fly ash has more positive effect on compressive strength in the long-term. The compressive strength of concrete samples containing type V cement with microsilica showed a greater increase than that of type II cement. Optimum amount of microsilica for concretes made of type II and type V cements are 10-15 percent and 10 percent replaced with cement, respectively. Similarly, optimum amount of flyash for concretes made of type II and type V cements are 15 for both, percent replaced with cement. The highest compressive strength in the two component additives is the F10S10 compound.