اعتبار،چابکی،پاسخگویی
نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری مهندسی عمران گرایش سازه،دانشگاه آزاد اسلامی واحد زنجان،ایران
2 دکتری مهندسی عمران گرایش سازه،دانشگاه تهران، مدرس دانشکده مهندسی و پرواز دانشگاه امام علی(ع) ، تهران، ایران
3 کارشناسی ارشد مهندسی عمران گرایش راه و ترابری، دانشگاه علم و صنعت ایران،مدرس دانشگاه امام علی(ع) ، تهران، ایران
کلیدواژهها
عنوان مقاله English
نویسندگان English
Airport runways, as critical aviation infrastructure, are continuously subjected to heavy dynamic loads during aircraft takeoff and landing, as well as diverse environmental conditions. In recent years, climate change has introduced severe temperature fluctuations, intense rainfall, and extreme weather events, posing serious challenges to the performance and durability of asphalt pavements on airport runways. This study investigates the effect of using two-component Parafiber (comprising a polymer soluble in bitumen and cellulose fibers) on the mechanical and performance properties of special asphalt mixtures designed for airport runways. To precisely evaluate the behavior of asphalt mixtures, a device for determining compressive and tensile strength of asphalt with a digital display was designed and manufactured. Two mix designs were prepared: a control mixture without additives and a mixture containing 1.5% two-component Parafiber. Marshall stability and flow tests, indirect tensile strength (ITS) tests, and moisture susceptibility tests (AASHTO T283) were conducted on the specimens. The results indicate that the use of two-component Parafiber increases Marshall stability from 1390 to 1420 kg (an increase of approximately 2%), reduces flow from 2.4 to 2.1 mm, and improves the Marshall stability ratio (24-hour to 30-minute immersion) from 78% to 87%. Furthermore, the indirect tensile strength of fiber-reinforced specimens in dry condition (930 kPa) and saturated condition (785 kPa) showed significant improvement compared to the control mixture (850 kPa and 660 kPa, respectively). The tensile strength ratio (TSR) for the fiber-reinforced mixture was 84.4%, compared to 77.6% for the control mixture. The bitumen film thickness in the fiber-reinforced mixture increased due to proper aggregate fracture and uniform bitumen coating, which reduced stripping and enhanced moisture resistance. Based on the findings, the use of Parafiber-reinforced asphalt can be considered an effective solution for increasing the strength and durability of airport runways against adverse environmental conditions and heavy air traffic loads
کلیدواژهها English
