بررسی رفتار بتن سنگین دارای نسبت‌های مختلف حجمی ‌پودر ایلمنیت و تاثیر محافظتی آن در برابر تشعشعات یونیزان

عظیمی, عباس; بازایی, امیرحسین; منصوری, بابک

doi:10.22065/jsce.2023.389367.3060

بررسی رفتار بتن سنگین دارای نسبت‌های مختلف حجمی ‌پودر ایلمنیت و تاثیر محافظتی آن در برابر تشعشعات یونیزان

نوع مقاله : علمی - پژوهشی

نویسندگان

عباس عظیمی ¹

امیرحسین بازایی ²

بابک منصوری ³

¹ کارشناس ارشد مهندسی عمران گرایش سازه، گروه مهندسی عمران، واحد سپیدان، دانشگاه آزاد اسلامی، سپیدان، ایران

² مربی، دانشکده مهندسی عمران، ، دانشگاه فنی و حرفه ای، تهران، ایران

³ استادیار گروه مهندسی عمران،واحد فیروزاباد، مرکز میمند،دانشگاه آزاد اسلامی،میمند ایران

10.22065/jsce.2023.389367.3060

چکیده

امروزه کلیه بیمارستان‌ها مجهز به آزمایشگاه و یا بخش‌های پرتو‌درمانی می‌باشند و بیمار ناچار است تا از مزایای روش‌های نوین پرتو درمانی بهره گیرد. همچنین ساخت نیروگاه‌ها و مراکز اتمی ‌و هسته‌ای جز زمینه‌های پیشرفت کشور تلقی می‌شود و داشتن تکنولوژی و دانش فنی در توسعه زیرساخت‌های کشور اهمیت بسزایی دارد. از طرفی افراد مشغول بکار در این مراکز عمدتاً پزشکان، پرستاران و مهندسین فیزیک اتمی ‌و هسته‌ای هستند که جزء سرمایه‌های انسانی و ملی محسوب می‌شوند و ضرورت دارد تا با ایجاد تمهیداتی میزان خطرات ناشی از تششعات مضر نظیر اشعه گاما و ایکس را به حداقل رساند. در حال حاضر از دیوار‌های بتنی عریض و با چگالی بالا یا بتن تسلیح شده با پوشش یک یا چند لایه سرب جهت جلوگیری از عبور پرتوهای مضر استفاده می‌شود. با توجه به اینکه کشور ایران غنی از معادن ایلمنیت می‌باشد ضرورت دارد تا جهت ارزان‌سازی و استفاده از مصالح بومی ‌جهت ارز‌آوری و اشتغال‌زایی و توسعه معادن بومی بررسی گردد که افزودن ایلمنیت در بتن تا چه میزان می‌تواند در تضعیف تششعات مضر موثر باشد. در این تحقیق برای ساخت بتن سنگین از ایلمنیت در نسبت‌های مختلف حجمی 10%، 20%، 30% و 40% جایگزین ماسه استفاده شد. مبنای طرح اختلاط بتن سنگین ACI-304.3R به روش حجمی انتخاب شد. برای بررسی خصوصیات رفتاری نیز آزمایش‌های اسلامپ، وزن مخصوص بتن تازه، مقاومت فشاری و در نهایت میزان نفوذ پرتو ایکس و گاما از بتن مورد بررسی قرار گرفت. نتایج این تحقیق نشان داد که افزودن 20% حجمی ‌ایلمنیت به جای ماسه می‌تواند تا 47% مقاومت فشاری 90 روزه بتن را افزایش دهد. همچنین افزودن 40% حجمی ‌ایلمنیت در بتن می‌تواند میزان پرتو عبوری ایکس و گاما را به ترتیب تا 77/24% و 16/18% تضعیف نماید.

کلیدواژه‌ها

بتن سنگین

پرتو گاما

پرتو ایکس

ایلمنیت

بتن محافظ

موضوعات

تحلیل، طراحی و اجرای سازه های ویژه

عنوان مقاله English

Investigating The Behavior Of Heavy Concrete With Different Volume Ratios Of Ilmenite Powder And Its Protective Effect Against Ionizing Radiation

نویسندگان English

abbas azimi ¹

amirhossein bazaee ²

Babak Mansoori ³

¹ Master's degree in Civil Engineering, Structural Engineering, Department of Civil Engineering, Islamic Azad University, Sepidan Branch, Sepidan, Iran

² Instructor, Faculty of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran

³ Assistant Professor, Department of Civil Engineering, Firoozabad Branch, Meymand center, Islamic Azad University, Meymand, Iran

چکیده English

Today, all hospitals are equipped with laboratories or radiation therapy departments, and the patient should take advantage of new treatment methods. Also, the construction of atomic and nuclear power plants and laboratories has contributed to the country's progress, and having technology and knowledge is important in the development of the country's infrastructure. Also, the people working in these centers are mainly doctors, nurses, and atomic physics engineers, who are considered geniuses and human capital, and it is necessary to reduce the amount of dangers caused by dangerous rays such as gamma rays and X-rays. Currently, thick and high-density concrete walls or reinforced concrete with one or more layers of lead tape are used to prevent the passage of dangerous rays. Considering that Iran has a lot of ilmenite mines, it is necessary to check how much ilmenite can be added in concrete in order to reduce the price and use domestic materials to save and find jobs and develop domestic mines. Dangerous to be effective. In this research, 10%, 20%, 30% and 40% ilmenite was used instead of sand to make heavy concrete. ACI-304.3R heavy concrete construction standard was determined by volumetric method. To investigate the characteristics of heavy concrete from slump tests, the specific weight of fresh concrete, compressive strength and X-ray and gamma penetration measurements of concrete were investigated. The results of this research showed that adding 20% by volume of ilmenite instead of sand can increase the 90-day compressive strength of concrete by 47%. Also, adding 40% by volume of ilmenite in concrete can weaken the amount of x-ray and gamma rays by 24.77% and 18.16%, respectively.

کلیدواژه‌ها English

Heavy concrete

gamma ray

X-ray

ilmenite

protective concrete

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