توسعه بتن ژئوپلیمری عملکرد بالا با خواص عایق حرارتی برتر از طریق استفاده از پودر PET، لاستیک و مصالح فعال‌شده با اکسید کلسیم

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
هادی بهمنی 1
داوود مستوفی نژاد 2
1 فارغ التحصیل دکترا، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان
2 دانشکده مهندسی عمران/ دانشگاه صنعتی اصفهان
10.22034/24.6.81
چکیده
تحقیقات پیشین به ندرت به بررسی توسعه بتن عایق حرارتی با عملکرد بالا با استفاده از مواد فعال‌سازی شده با اکسید کلسیم پرداخته‌اند. هم‌چنین، تأثیر جای‌گزینی نسبت‌های بالایی از سنگ­دانه‌ها با پودر لاستیک فرسوده و پلی‌اتیلن ترفتالات (PET) بر ویژگی‌های مکانیکی و حرارتی بتن‌های ژئوپلیمری با عمل­کرد بالا کم­تر مورد مطالعه قرار گرفته است. این مطالعه به بررسی توسعه بتن ژئوپلیمری عایق حرارتی با عمل­کرد بالا با استفاده از مواد فعال‌سازی شده با اکسید کلسیم می‌پردازد و یک روش اختلاط نوین را برای بهبود تراکم بتن عایق حرارتی با عمل‌کرد بالا که شامل سرباره فعال‌سازی شده با اکسید کلسیم است، ارائه می‌دهد. در این تحقیق، 10%، 20%، 30%، 40% و 50% از سنگ­دانه‌ها با پودر لاستیک فرسوده و پودر PET جایگزین شده‌اند. آزمایش‌های مقاومت فشاری، خمش چهار نقطه‌ای و مقاومت کششی به منظور تعیین ویژگی‌های مکانیکی بتن انجام شده‌اند. علاوه بر این، آزمایش ضریب هدایت حرارتی برای ارزیابی ویژگی‌های حرارتی بتن توسعه‌یافته انجام گرفته است. نتایج نشان می‌دهند که جایگزینی سنگدانه‌ها با 10% پودر لاستیک فرسوده یا پودر PET، ظرفیت جذب انرژی بتن را به ترتیب تا 143% و 107% افزایش داده است، در حالی که ویژگی‌های مکانیکی به ترتیب تا 10% و 7% کاهش یافته‌اند. استفاده از 50% پودر لاستیک فرسوده و PET به عنوان جایگزینی برای سنگدانه‌ها، ضریب هدایت حرارتی نمونه‌ها را به ترتیب تا 70% و 60% کاهش داده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Development of thermal-insulating high-performance geopolymer concrete containing rubber and PET powders with calcium oxide-activated materials

نویسندگان English

Hadi Bahmani 1
Davood MOSTOFINEJAD 2
1 PhD, Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan,
2 Professor, Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan
چکیده English

Prior research has not explored the creation of concrete with superior thermal insulation properties using calcium oxide-activated materials. Furthermore, the impact of substituting large proportions of sand with worn rubber powder and PET on the mechanical and thermal characteristics of high-performance geopolymer concrete remains uninvestigated. This study addresses these gaps by examining the development of geopolymeric concrete with enhanced thermal insulation properties using calcium oxide-activated materials. A novel mixing method has been devised to improve the compaction of thermally insulating concrete, which includes calcium oxide-activated slag. For the purposes of this research, worn rubber powder and PET powder have replaced 10%, 20%, 30%, 40%, and 50% of the aggregates. The mechanical properties of the concrete were determined through compressive strength, four-point bending, and tensile strength tests. Lastly, the thermal conductivity coefficient was tested to ascertain the thermal properties of the developed concrete.

The findings revealed that in the developed concrete, substituting 10% of the aggregates with worn rubber powder or PET powder increased the energy absorption capacity of the concrete by 143% and 107%, respectively, while its mechanical properties decreased by 10% and 7%, respectively. Moreover, using 50% worn rubber powder and PET as aggregate substitutes reduced the samples’ thermal conductivity by 70% and 60%, respectively.

 

کلیدواژه‌ها English

Scrap tire
PET
thermal conductivity
geopolymer concrete
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مهندسی عمران مدرس
دوره 24، شماره 6
آذر و دی 1403
صفحه 81-92