بررسی اثر افزایش دما بر پدیده‌ پوسته شدن در قطعات بتنی پر مقاومت

نوع مقاله : یادداشت پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم

چکیده

در دنیای امروز استفاده از بتن پرمقاومت در صنعت ساختمانی روبه افزایش بوده و نیاز است که رفتار اجزای ساخته شده از این نوع بتن، در برابر عوامل گوناگون و ازجمله افزایش دما، مورد بررسی قرار گیرد. بیشتر تحقیقات صورت گرفته در بررسی اثر ‌افزایش دما بر رفتار قطعات بتنی پرمقاومت، برمبنای مدل‌های آزمایشگاهی بوده است و بررسی‌های نرم‌افزاری و عددی در این زمینه کمتر بوده است. در این تحقیق، با معرفی یک مدل تحلیلی، به بررسی رفتاری انواع قطعات بتنی ساخته شده از بتن پرمقاومت در برابر افزایش دما پرداخته شده است و هم­زمان پدیده‌ پوسته شدن بتن تحت حرارت مورد بررسی قرار گرفته است. در تحقیق پیش‌رو، ارتباط بین نرخ حرارت‌دهی و زمان پوسته شدن اولیه با معرفی یک رابطه، مشخص شده است. نتایج حاصل از این تحقیق گویای این مسئله است که افزایش دما بر قطعات بتنی پرمقاومتی که کاهش نفوذپذیری آن‌ها نسبت به رده‌های پائین‌تر خود بیشتر است، صرف­ نظر از رده‌ آن، اثر بیشتری داشته، طوری که اجزای ساخته شده از بتن رده ۸۰ مگاپاسکال این تحقیق، در معرض بیشتر پدیده‌ پوسته شدن، حین افزایش دما، بوده و سرعت پوسته شدن اولیه در این نوع خاص از بتن می‌تواند تا دو برابر دیگر رده‌های بتن پرمقاومت باشد، ضمن این­که در نرخ حرارت‌دهی کم (oC/min5/2) برخلاف نرخ حرارت‌دهی بالای ( oC/min15) اجزای بتنی، تفاوت قابل ملاحظه‌ای در سرعت پوسته شدن اولیه در رده‌های مختلف بتن پرمقاومت مشاهده نمی‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Effect of Increasing Temperature on the Spalling Phenomenon in High Strength Concrete Parts

نویسندگان [English]

  • Vahid Reza Afkhami
  • Ehsan Dehghani
Faculty of Civil Engineering, University of Qom, Qom 02532103000, Iran
چکیده [English]

In this research, by introducing an analytical model, the behavioral investigation of various types of concrete parts made of high-resistance concrete against the increase in temperature has been investigated, and at the same time, the phenomenon of flaking of concrete under heat has been investigated. In the upcoming research, the relationship between the heating rate and the initial spalling time has been determined by introducing a relationship.

کلیدواژه‌ها [English]

  • High strength concrete
  • Heating rate
  • Permeability
  • Spaling
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