Document Type : Original Article
Authors
1
M.Sc Student in Structural Eng., Ahrar Institute of Technology and Higher Education, Rasht, Iran
2
Ph,d. in Structural Eng, Department of Civil Enjineering, Ahrar Institute of Technology and Higher Education, Rasht, Iran
10.22065/jsce.2024.425482.3280
Abstract
The high energy consumption in the cement industry and the emission of CO2 provide serious environmental threats. Therefore, the use of pozzolanic materials as natural cementitious material can have a direct relation to sustainable development. The current research investigates the effect of natural zeolite and silica fume pozzolans on the durability of fiber reinforced concrete in chloride environments. The studied specimens contained silica fume of 5 and 10 percent and zeolite of 5, 10, and 15 percent as cement weight substitutes. Moreover, to examine the impact of steel fibers, one percent volume as the optimal percentage, was added to the mixture. The specimens, after being processed, were tested at 28 and 90 days in normal and chloride conditions. Results showed that various specimens in both conditions increased their compressive strength and mainly tensile strength due to the addition of pozzolans, with and without steel fibers. The electrical resistance of specimens without fibers remarkably exceeded that of the control sample. However, the electrical resistance of specimens containing steel fibers considerably lessened compared to those without fibers. The coefficient of chlorine ion migration was lower in samples containing pozzolan and higher in samples with fibers alone, compared to control samples. The results showed exposure to a chloride environment resulted on average in a decrease in compressive strength by 13.4%, tensile strength by 39.72%, and electrical resistance by 76.2% compared to identical samples in a normal environment. Furthermore, the chloride ion penetration coefficient in the samples, compared to the control samples, had a decrease of 24 to 50 percent. The average increase in water absorption in the chloride environment compared to the normal environment was also 73.6 percent.
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