1403/01/10
مهدی نعمت زاده افروزی

مهدی نعمت زاده افروزی

مرتبه علمی: استاد
ارکید: 0000-0002-8065-0542
تحصیلات: دکترای تخصصی
اسکاپوس: 36198613700
دانشکده: دانشکده مهندسی و فناوری
نشانی: دانشگاه مازندران، دانشکده مهندسی و فناوری
تلفن: 011-35302903

مشخصات پژوهش

عنوان
Erosion resistance of high-strength concrete containing forta-ferro fibers against sulfuric acid attack with an optimum design
نوع پژوهش
JournalPaper
کلیدواژه‌ها
Sulfuric acid attack Forta-ferro fibers Nano-silica Ultrasonic pulse velocity Erosion resistance High-strength concrete Optimization Response surface method
سال
2017
مجله CONSTRUCTION AND BUILDING MATERIALS
شناسه DOI
پژوهشگران Mahdi Nematzadeh ، saber fallah

چکیده

One important factor affecting the resistance and durability loss of concrete structures is acid attack, and one common method of improving concrete properties against this attack is to use high-strength fiberreinforced concrete. In this study, high-strength concretes containing different percentages of fortaferro fibers (consisted of synthetic materials in the form of twisted bundle non-fibrillated monofilament and fibrillated polypropylene network) in the presence of silica fume and nano-silica pozzolans were made. After placing the specimens in 5% sulfuric acid for different days of immersion, the effect of adding fibers and pozzolans to the concrete mix on the strength and durability of the high-strength concrete was examined and the relationships between them were determined. Here, ultrasonic pulse velocity (UPV) test was also performed as a nondestructive test to evaluate the quality of high-strength fibrous concrete. The results indicated that as the volume fraction of fibers in the high-strength concrete exposed to sulfuric acid attack increased, less reduction in weight, crushing load, and ultrasonic pulse velocity occurred. In addition, using silica fume resulted in a greater improvement in the durability of the acid-exposed specimens relative to using nano-silica. Moreover, after 63 days immersion in acid, the specimen FF0.6SF10 had the lowest loss in the crushing load, UPV, and weight by demonstrating 4.7, 2.9, and 3.1%, respectively, variations relative to the corresponding reference specimen. Finally, an optimum solution for the design parameters where the crushing load of high-strength fibrous concrete is maximized, was found employing response surface method (RSM).