Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 894-902   

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  NEW MODEL FOR VISCO-ELASTIC BEHAVIOR OF ASPHALT MIXTURE WITH COMBINED EFFECT OF STRESS AND TEMPERATURE
 
S. M. Mirabdolazimia and G. H. Shafabakhsh
 
( Received: February 14, 2017 – Accepted in Revised Form: January 06, 2018 )
 
 

Abstract    The analysis of pavements and their ingredients has always been important due to a good understanding of their behavior under different conditions; that leads to more accurate relations. Due to the extent of asphalt mixture application in the world, the assessment of different behaviors of this mix is very important from various aspects of performance and safety. Given that the asphalt mixtures are inherently very sensitive to temperature changes due to bitumen content, identification and analysis of the viscoelastic and visco-elasto-plastic behavior of the mixture is of particular importance. The scope of present research is to provide new model of viscoelastic behavior of asphalt concrete pavements with a combined effect of stress and temperature using genetic programming techniques. For this purpose, a number of dynamic creep tests under various temperatures and different stress levels were done. Beside, in this study a comparison is made between the generalized model and proposed model in estimating the visco elastic response of asphalt samples. Performance of the genetic programming model is quite satisfactory. The new proposed model will also help further researchers willing to perform similar studies, without carrying out destructive tests.

 

Keywords    Creep, Visco-elastic Model, Asphalt Mixture, Generalized Model, Genetic Programming

 

چکیده    تحليل روسازي راه ها و مواد تشکیل دهنده آنها همواره به دليل شناخت بهتر رفتار آنان تحت شرايط متفاوت از اهميت بالايی برخوردار بوده و باعث درک بهتر و در نتيجه طرح روابط دقيق‌تر مي‏گردد. با توجه به گستره وسیع کاربرد مخلوط های آسفالت در دنیا، ارزیابی رفتارهای مختلف این مخلوط از جنبه های مختلف عملکردی و ایمنی از اهمیت بسزایی برخوردار می باشد. با توجه به اینکه مخلوط های آسفالتی به طور ذاتی و به سبب قیر محتوی، نسبت به تغییرات دما بسیار حساس هستند، لذا شناسایی و بررسی رفتار ویسکو الاستیک و ویسکو الاستو پلاستیک این مخلوط ها و تعیین پارامترهای مؤثر در این رفتار که بسیار وابسته به تغییرات دماست، از اهمیت ویژه ای برخوردار است. هدف از این پژوهش ارائه مدل جدید رفتار ویسکو الاستیک رویه های بتن آسفالتی راه ها با تاثیر همزمان هر دو عامل تنش و دما با استفاده از تکنیک برنامه نویسی ژنتیک می باشد. برای این منظور، تعدادی آزمون خزش دینامیکی تحت دماهای مختلف و سطوح متفاوت تنش انجام گردید. علاوه بر این، در این پژوهش مقایسه ای بین مدل عمومی و مدل پبشنهادی در زمینه تخمین پاسخ ویسکو الاستیک نمونه های آسفالت انجام شده است. عملکرد مدل برنامه نویسی ژنتیکی کاملاً رضایت بخش است. همچنین مدل جدید ارائه شده، محققان بیشتری که قصد انجام تحقیقات مشابه دارند را بدون نیاز به انجام آزمونهای مخرب یاری خواهد نمود.

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