Performance eva‎luation of asphalt mixtures containing crumb rubber and Warm additive using balanced mixture design approach (BMD)

1/1/1900 12:00:00 AM

Asphalt mixtures, which are essential materials for road construction and maintenance, often face challenges such as rutting, low-temperature cracking, and moisture susceptibility. To enhance the properties of asphalt mixtures and increase their durability against these challenges, the incorporation of additives and recycled materials plays a crucial role. This study examines the performance of asphalt mixtures that include crumb rubber and WMA chemical additives (Iterlow-T). The primary objective of this research is to assess the effects of crumb rubber as a recycled material and Iterlow-T additives on the mechanical properties and durability of asphalt mixtures in response to environmental factors and traffic-inducted loads. This study employed the Balanced Mix Design (BMD) method to design and test asphalt mixtures with 15% crumb rubber and Iterlow-T additives at three different levels (0.5%, 1%, and 1.5%). Performance tests including I-FIT, moisture susceptibility, dynamic creep, and SCB fracture under pure loading mode I, were conducted at temperatures of 0°C, -10°C, and -20°C. the results indicated that the addition of crumb rubber and WMA chemical additives improved the mechanical properties of the mixtures. The mixture containing 1% Iterlow-T additive exhibited the optimal performance in both the moisture susceptibility and dynamic creep tests, with increases of 10% and 342%, respectively, compared to the control sample. Overall, the fatigue index (FI) increased in all samples compared to the control, with the mixture containing 0.5% Iterlow-T additive showing the optimal performance, exhibiting an 85% increase. In the fracture test, the addition of 0.5% Iterlow-T additive resulted in a 164% increase in fracture energy at -20°C compared to the control sample, and was the most optimal performance at this temperature. Therefore, the use of recycled materials and WMA chemical additives can be an effective solution to enhance the performance of asphalt mixtures and reduce the costs associated with the production of new materials. Additionally, the results of the Balanced Mix Design indicated that all three performance parameters of the samples containing WMA chemical additives (Iterlow-T) were within the acceptable range as per the standards.

طرح اختلاط تعادلي , پودر لاستيك , افزودني‌ نيمه‌گرم شيميايي , شكست دماي پايين

BMD , crumb rubber , WMA chemical additives , Low-temperature fracture

mahsa moharrami aghabagher

mahmod ameri