خواص مکانیکی و نفوذپذیری بتن سنگین حاوی گندله آهن، پوسته آهن و میکروسیلیس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 استادیار، گروه مهندسی عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

3 گروه عمران، دانشکده صنعت و معدن چرام، دانشگاه یاسوج، چرام، ایران

10.22124/jcr.2022.21474.1550

چکیده

بتنی که دارای وزن مخصوص بیشتری نسبت به بتن معمولی است به عنوان بتن سنگین شناخته می شود. استفاده از سنگدانه با وزن مخصوص بالا در واقع مهمترین راهکار تولید بتن سنگین می‌باشد. به دلیل استفاده از سنگدانه‌های با خاصیت فلزی و عدد اتمی بالا، این نوع بتن دارای خاصیت حفاظت در برابر اشعه‌های مضر می‌باشد. در این تحقیق امکان استفاده از گٌندله آهن به همراه پوسته آهن به عنوان جایگزین بخشی از سنگدانه بتن برای تولید بتن سنگین مورد برسی قرار گرفته است. بدین منظور 25، 80 و 100 درصد سنگدانه با گندله و پوسته آهن جایگزین شده و برای جلوگیری از اثر این جایگزینی در افزایش تخلخل بتن، بخشی از سیمان طرح اختلاط نیز با میکروسیلیس جایگزین شده است. آزمایشات مقاومت فشاری، مقاومت کششی، خمشی و همچنین نفوذپذیری بر روی نمونه‌های ساخته شده، انجام گرفته و همچنین وزن مخصوص بتن سنگین تولید شده نیز گزارش شده است. نتایج نشان دهنده اثر بسیار خوب میکروسیلیس بر بهبود خواص بتن سنگین می‌باشد. مقاومت فشاری بتن سنگین با افزایش درصد گندله و پوسته آهن در حضور میکروسیلیس تا 34 درصد بیشتر از بتن معمولی بدست آمده است. مقاومتهای کششی و خمشی نیز در صورت استفاده از میکروسیلیس به ترتیب حداکثر تا 50 و 12 درصد نسبت به بتن معمولی افزایش داشته اند. نفوذپذیری بتن سنگین برای هر درصد جایگزینی گندله و پوسته آهن کمتر از بتن معمولی بوده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Mechanical Properties and Permeability of Heavyweight Concrete Containing Iron Pellets, Crumb Iron, and Microsilica

نویسندگان [English]

  • Abdollah Karami 1
  • Abdolkarim Abbasi Dezfooli 2
  • Seyed Abbas Hosseini 3
1 M.S.c Student, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
2 Assistant Professor, Department of civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
3 Assistant Professor in Structural Engineering, Faculty of Technology and Mining, Yasouj University, Choram, Iran .
چکیده [English]

Concrete that has higher specific gravity than conventional concrete is known as heavy concrete. The use of high specific gravity aggregate is the most important way for the production of heavy concrete. Due to the use of aggregates with metallic properties and high atomic number, this type of concrete has the property of shielding against harmful rays. In this research, the possibility of using iron pellets with crumb iron as a substitute for concrete aggregate to produce heavy concrete has been investigated. For this purpose, 25, 80 and 100% of aggregates have been replaced with pellets and iron shells, and to prevent the effect of this replacement on increasing the porosity of concrete, part of the mixing cement has also been replaced with micro silica. Compressive strength, tensile strength, flexural strength as well as permeability tests have been performed on the constructed specimens and the specific gravity of the produced heavy concrete has also been reported. The results show a very good effect of micro silica on improving the properties of heavy concrete. The compressive strength of heavy concrete in the presence of micro silica is up to 34% higher than conventional concrete. Tensile and flexural strengths have increased up to 50% and 12%, respectively, compared to conventional concrete if micro silica is used, respectively. The permeability of heavy concrete for each percentage of pellet and iron shell replacement was lower than conventional concrete

کلیدواژه‌ها [English]

  • Heavyweight concrete
  • Iron pellets
  • Crumb iron
  • compressive strength
  • Permeability

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