عنوان	Study of Compress Strength and Time Setting of Concrete by Additives of Silica Fume and Nano Silica
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Cement,Nano-SiO2,Silica fume, Setting time, Compressive strengths
چکیده	In the present study effects of the silica fume and nano-SiO2 on cement mortars is investigated. Silica fume size is in range of 0.1-0.5 micron and nano-silica is in particle form with 98.31 % of SiO2 in nano scale. The properties of cement mortar are studied at three water/cement ratios of 0.30, 0.35 and 0.50 and three contents of silica fume particles per cement of 5, 10 and 15 %. For evaluation of nano-silica effects on the cement mortar four water/cement ratios of 0.25, 0.30, 0.35 and 0.50 and four contents of nano-SiO2 particles per cement of 5, 10 and 15 % are used. The experimental results show that the compressive strengths of mortars with nano-SiO2 particles are higher than the corresponding mortars containing silica fume for two times of 7 and 28 days. The setting time of mortars with nano-SiO2 particles are less than the corresponding mortars containing ordinary portland cement and micro silica.
پژوهشگران	افشار علی حسینی (نفر اول)، سید حسین حسینی (نفر دوم)، علیرضا عباس زاده (نفر سوم)