بررسی تأثیر پیرشدگی بلندمدت بر خصوصیات عملکردی دمای بالا و پایین قیر

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
محمدمهدی دادایی 1
پوریا حاجی کریمی 1
محمد راهی 2
مهدی دستوری رزاز 3
بهنوش طهماسبی 3
فریدون مقدس نژاد 1
1 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)، تهران، ایران
2 واحد تحقیق و توسعه، شرکت نفت پاسارگاد، تهران، ایران
3 واحد تحقیق و توسعه، شرکت نفت پاسارگاد، آبادان، ایران
10.22034/25.3.6
چکیده
تحلیل دقیق رفتار قیر به عنوان یک ماده ویسکوالاستیک و پدیده‌های طبیعی حاکم بر آن مانند پیرشدگی، از مسائل مهم مهندسی روسازی است. از این رو کنترل خصوصیات دمای پایین و بالای قیرها به منظور پیشگیری از ترک خوردگی‌های دمای پایین و آسیب‌های متداول دمای بالا به منظور خدمت‌دهی مناسب در طول عمر روسازی ضروری است. در این مطالعه شبیه‌سازی پدیده پیرشدگی و بررسی اثرات آن بر روی خصوصیات مکانیکی قیرها با استفاده از روش دستورالعمل سوپرپیو یعنی روش RTFOT برای پیرشدگی کوتاه‌مدت و روش PAV برای پیرشدگی بلندمدت انجام شده است. به منظور بررسی تأثیر چرخه‌های مکرر PAV بر خصوصیات قیرها سه نوع قیر با درجات نفوذ مختلف 50-40 (70-16PG)، 60-70 (64-22PG) و 100-85 (28-58PG) انتخاب و از هر کدام سه نمونه تحت مراتب پیرشدگی یک الی سه بار PAV قرار گرفته‌اند. آزمون رئومتر تیر برشی (BBR) در سه دما از صفر تا 12- درجه سانتی‌گراد و رئومتر برش دینامیکی (DSR) در هفت دما از 46 تا 82 درجه سانتی‌گراد انجام شده است. بر اساس نتایج به ‌دست ‌آمده، دمای بالای عملکردی قیرها حداکثر سه ‌رده و دمای پایین عملکردی آن‌ها حداکثر دو رده افزایش پیدا کرده است. به ‌عبارت دیگر درجه‌بندی قیرهای مورد بررسی در این پژوهش، پس از سه مرتبه اعمال PAV به‌ترتیب به 4-82، 10-82 و 16-70 تبدیل شده است. همچنین ارتباط خصوصیات عملکردی دمای بالای قیرهای پیرشده با تغییرات شیمیایی آن‌ها در مراتب مختلف پیرشدگی بررسی و تغییرات آن‌ها به منظور نمایش همبستگی میان این خصوصیات مورد بررسی قرار گرفته است. نتایج نشان داده است که خصوصیات ویسکوالاستیک دمای بالا و شاخص پیرشدگی شیمیایی قیرهای مختلف دارای ارتباط خطی قوی با ضریب تعیین (R2) بیش از 9/0 بوده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Investigation of the effect of long-term aging on the high- and low-temperature performance of bitumen

نویسندگان English

Mohammad Mehdi Dadaei 1
Pouria Hajikarimi 1
Mohammad Rahi 2
Mehdi Dastoori Razaz 3
Behnoosh Tahmasbi 3
Fereidoon Moghadas Nejad 1
1 Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
2 Dept. of Research and Development, Pasargad Oil Company, Tehran, Iran
3 Dept. of Research and Development, Pasargad Oil Company, Abadan, Iran
چکیده English

Accurate analysis of bitumen behavior as a viscoelastic material and its natural phenomena such as aging are important issues in pavement engineering. Therefore, controlling the low and high temperature properties of bitumens is essential to prevent low temperature cracking and common high temperature distress in order to provide proper service throughout the pavement life. In this study, the aging phenomenon and its effects on the mechanical properties of bitumens were simulated using the Superpave method, namely the RTFOT method for short-term aging and the PAV method for long-term aging. In order to investigate the effect of repeated PAV cycles on the properties of bitumens, three types of bitumen with different penetration degrees of 40-50 (PG70-16), 60-70 (PG64-22) and 85-100 (PG58-28) were selected and three samples of each were subjected to one to three PAV aging times. The beam shear rheometer (BBR) test was performed at three temperatures from 0 to -12°C and the dynamic shear rheometer (DSR) at seven temperatures from 46 to 82°C. Based on the results obtained, the high temperature performance of the bitumens increased by a maximum of three grades and their low temperature performance increased by a maximum of two grades. In other words, the grading of the triple bitumens, after three times of PAV, became 82-4, 82-10, and 70-16, respectively. Also, the relationship between the high temperature performance properties of the aged bitumens and their chemical changes at different times of aging was investigated and their changes were examined to show the correlation between these properties. The results showed that the high temperature viscoelastic properties and the chemical aging index of the different bitumens had a strong linear relationship with a coefficient of determination (R2) of more than 0.9.

کلیدواژه‌ها English

Asphalt binder
Aging
Bending Beam Rheometer
Dynamic Shear Rheometer
Performance Grading
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مهندسی عمران مدرس
دوره 25، شماره 3 - شماره پیاپی 83
مرداد و شهریور 1404
صفحه 61-72