High-volume fly ash replacing cement helps to improve the fluidity, volume stability, durability, and economy of self-compacting concrete (SCC). Sulfate attack is most common form durability damage hydraulic concrete; in particular, performance degradation at water level change position more significant. Therefore, research on influence effect mechanism great significance. In this paper, regula...

migraine is one of the common varieties of headache. it involves 4 to 6 percent of men and 13 to 16 percent of women under 30 years in more than 80% of cases. some studies have shown that in 50% of patients serum magnesium level decreases during attacks of headache and using magnesium tablets and intravenous magnesium sulfate is more effective for treatment of migraine attack, than placebo. thi...

Exposure conditions significantly affect the resistance of cement to sulfate attack. This article investigates the effect of sulfate on electrical conductivity of ordinary Portland cement (OPC). Cement paste specimens were prepared according to water/cement (W/C) ratio equal 0.25 either free of sodium sulfate or its addition with concentrations of 5000ppm, 10000ppm and 15000ppm by weight. This ...