امکان‌یابی ارائه منحنی جامع ویژگی‌های بنیادی ویسکوالاستیک قیر با استفاده از نتایج آزمایش جاروب دمایی

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
مسعود غلامی
پوریا حاجی کریمی
علی خدایی
دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)، تهران، ایران
10.22034/23.2.10
چکیده
خصوصیات ویسکوالاستیک قیرها براساس منحنی‌های جامع مدول برشی مختلط (G*) و زاویه اختلاف فاز (δ) بیان می‌شوند که این منحنی‌ها به طور متداول از انتقال افقی نمودارهای نتایج آزمایش‌ جاروب فرکانسی به کمک ضرایب انتقال دمایی ایجاد می‌شوند. در این پژوهش، توسعه منحنی‌های جامع قیر به کمک نتایج آزمایش جاروب دمایی به جای استفاده از نتایج آزمایش جاروب فرکانسی مورد بررسی و امکان‌سنجی قرار گرفته است. آزمایش‌های جاروب دمایی و جاروب فرکانسی بر روی قیرهای ساده و اصلاح‌شده حاوی 2، 4 و 6 درصد پلیمر استایرن ـ اتیلن/پروپیلن ـ استایرن (SEPS) به ترتیب در بازه‌های دمایی 30 الی 90 و 10 الی 60 درجه سانتی‌گراد انجام و به منظور تعیین ضریب انتقال، از روش LCPC استفاده شده است. سپس منحنی‌های جامع مدول برشی مختلط و زاویه اختلاف فاز قیرها با استفاده از نتایج آزمایش جاروب فرکانسی و جاروب دمایی رسم گردید و الگوها، رفتار و مقادیر نمودارها با یکدیگر مقایسه و همبستگی نتایج تعیین گردید. نتایج نشان داد که روش LCPC به خوبی می‌تواند در تولید منحنی‌های جامع از نتایج آزمایش جاروب دمایی استفاده شود و منحنی‌های جامع با الگو و مقدار صحیح را تشکیل دهد. به علاوه، مقایسه منحنی‌های جامع حاصل از نتایج آزمایش‌های جاروب فرکانسی و جاروب دمایی نشان داد که الگوهای موجود و مقادیر مدول برشی مختلط و زاویه اختلاف فاز در این منحنی‌های جامع توسعه داده شده، معادل می­باشد. بنابراین نتایج آزمایش جاروب دمایی که سریع‌تر از آزمایش جاروب فرکانسی می‌باشد، می‌تواند جهت ترسیم منحنی‌های جامع مربوط به ویژگی­های ویسکوالاستیک قیرهای ساده و اصلاح­شده استفاده شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Using Temperature Sweep Test to Develope Master Curves of Bitumen Viscoelastic Properties

نویسندگان English

M. Gholami
P. Hajikarimi
A. khodaii
Department of civil and environmental engineering, Amirkabir university of technology (Tehran Polytechnic), Tehran, Iran
چکیده English

Asphalt mixtures and bitumens are faced with different traffic loading and thermal stresses during their lifetime. Due to their viscoelastic behavior, these materials exhibit different mechanical properties at different temperatures and traffic loading. Viscoelastic properties of bitumens are commonly expressed using the master curves of complex shear modulus (G*) and phase angle (δ) generally created by the horizontal shifting of the frequency sweep test results using shift factors. There are several methods for evaluating temperature shift factors, such as Williams, Landel, and Ferry (WLF) equation, modified Kaelble method, Log-Linear approach, and LCPC method. The LCPC method, developed using the Kramers-Kronig relationship, can be used to accurately evaluate the shift factor of bitumens, mastics, and asphalt mixtures. This study investigated the possibility of generating the master curves of bitumen based on temperature sweep test results rather than frequency sweep test results. Two types of bitumens were investigated in this study, neat bitumen with an 85-100 penetration grade (PG 58-22 performance grade) and SEPS modified asphalt binder with SEPS polymer content of 2, 4, and 6% by weight of the total binder. Temperature sweep tests were performed on all types of bitumens in a range of temperatures between 30 and 90 °C and the frequency of 1.59 Hz. Also, frequency sweep tests were performed on all kinds of bitumens in a range of temperature between 10 and 60 °C and a range of frequency between 0.1 and 100 Hz. The LCPC method was also investigated to calculate the shift factors for the master curves of complex shear modulus and phase angle, and the master curves of viscoelastic properties for all bitumen types are made based on temperature sweep and frequency sweep test results. The results indicated that the SEPS polymer could effectively increase the complex shear modulus and reduce the magnitude of phase angle. So, this polymer improved the rutting resistance of SEPS polymer-modified binders and led to better high-temperature performance of binders. In addition, the LCPC method effectively produced a valid and accurate form of the master curve using temperature sweep test results similar to the master curve using frequency sweep test results. Furthermore, the master curves of complex shear modulus (G*) and phase angle (δ) derived from temperature and frequency sweep test results exhibited comparable patterns and values. By plotting the value of complex shear modulus and phase angle obtained from the temperature sweep master curves versus the complex shear modulus and phase angle obtained from the frequency sweep master curves at the same reduced frequency, it was observed that all points were scattered in the vicinity of the y=x line. It was indicated that the master curves created based on temperature sweep test results have an acceptable approximation and accuracy with the master curves created based on frequency sweep test results. As a consequence, it may be preferable to generate the master curve of viscoelastic characteristics of bitumens using the results of the temperature sweep test, which is faster and more accurate in some conditions, compared to the results of the frequency sweep test.

کلیدواژه‌ها English

Bitumen
LCPC Method
Frequency Sweep Test
Temperature Sweep Test
Master Curve
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مهندسی عمران مدرس
دوره 23، شماره 2
خرداد و تیر 1402
صفحه 151-165