پديد آورندگان :
صالحي، حسن دانشگاه پدافند هوايي خاتم‌الانبياء(ص) - دانشكده ي مهندسي مكانيك , بيگلري جو، نادر دانشگاه عمران توسعه همدان - دانشكده ي مهندسي عمران , برخورداري، هوشنگ دانشگاه پدافند هوايي خاتم‌الانبياء(ص) - دانشكده ي مهندسي مكانيك
كليدواژه :
بتن بازيافتي , مدل‌سازي , بتن مادر , خصوصيات مكانيكي , مديريت مواد زائد
چكيده فارسي :
با وجود انجام مطالعات فراوان در زمينه‌ي بتن‌هاي بازيافتي، تاكنون درخصوص تأثير مقاومت بتن مادر در بتن‌هاي بازيافتي مدلي ارائه نشده است. ارائه‌ي مدل در طرح‌هاي بتني مي‌تواند از صرف هزينه و زمان مازاد براي ساخت آن‌ها جلوگيري كند. هدف از مطالعه‌ي حاضر، ارائه‌ي يك مدل رياضي براي پيش‌بيني رفتار مكانيكي بتن بازيافتي با استفاده از روش طراحي آزمايش مركب مركزي و تحليل آماري سطح پاسخ است. پارامترهاي مؤثر ورودي، شامل: مقاومت فشاري بتن مادر، درصدجايگزيني و عيار سيمان بوده است. نتايج نشان مي‌دهند كه مقاومت فشاري، مقاومت كششي و جذب آب بتن‌هاي بازيافتي به شدت وابسته به مقاومت فشاري بتن مادر هستند. با افزايش مقاومت فشاري شن بازيافتي از 19 به 36 مگاپاسكال، مقاومت فشاري بتن بازيافتي حدود 40٪ افزايش و جذب آب آن حدود 30٪ كاهش يافته است. زماني كه مقاومت فشاري بتن مادر بيش از 28 مگاپاسكال است، مي‌توان درصد جايگزيني سنگ‌دانه‌ي بازيافتي را افزايش داد و بتن‌هايي با مقاومت بالاتر از بتن مادر توليد كرد.
چكيده لاتين :
One of the most significant concerns of recent years among scientists has been related to waste management actions and policies. Unfortunately, landfills are filled with various debris and demolition from old building including waste concrete, glass, brick, ceramic, and plastic. Waste concrete seems to occupy a large volume of these landfills; thus, they are potentially among the most appropriate choices for recycling process. However, different papers have focused on the impact of recycled concrete aggregates in concrete and in recent years, no specific model has been recommended to predict the behavior of parent concrete in recycled concrete. In this study, a central composite design along with response surface methodology was employed to prepare experimental designs and model the properties of concrete made of recycled aggregates. Effective factors included compressive strength of parent concrete, substitution rate of parent concrete, and value of cement, while the compressive strength, tensile strength, and water absorption of recycled concrete were introduced as goal responses. Based on the statistical analysis, all recommended models were adequate with acceptable coefficient of determination ( ). Response surface and perturbation plots revealed that compressive strength, tensile strength, and water absorption of recycled concretes depended heavily on the compressive strength of parent concrete. Moreover, in order to generate concretes with higher compressive strength than the compressive strength of parent concrete, the value of compressive strength for parent concrete should be above MPa. However, for low-strength parent concretes, substitution rate should be limited in order to reduce undesirable performance. As the compressive strength of recycled concrete aggregates increased from to MPa, the compressive strength of recycled concrete was enhanced by over percent. In this substitution, water absorption reduced over percent. Additionally, when the compressive strength of recycled aggregates was fixed at MPa, by changing substitution rate from % to %, the compressive strength of recycled concrete increased from to MPa. The tensile strength of recycled concrete also was enhanced from to MPa.
