eva‎luation of effect of activated carbon on viscoelastic properties of hot mix asphalt

7/11/2023 12:00:00 AM

Nowadays increasing the number of axial loads cause the heighten in stresses and damages including rutting in the asphalt pavements. Since this type of incident, which depends on the viscoelastic properties of asphalt mixture, happens on the early days of operation, leading to improper appearance in the pavement and make the ground for more serious damage in the structure of road. This has led researchers and operators to modify the asphalt mixtures to better performance at high temperatures and to rutting and improve the viscoelastic properties of asphalt mixtures. In the present study, activated carbon powder (ACP) was added to the neat bitumen. At first, the optimum value of this material as bitumen modifier has been determinded by using of penetration grade, softening point, viscosity and dynamic shear reometer. The main purpose of this study is to eva‎luate the viscoelastic properties of asphalt mixtures containing activated carbon. To achieve this goal, the effect of temperature and stress level on the performance behavior of asphalt mixtures modified by activated carbon powder has been investigated under dynamic creep test. This experiment was conducted at two temperatures of 50℃ and 60℃ and under stress levels of 100, 200 and 300 KPa. According to the results, creep behavior of the samples was investigated. Also in order to determine the viscoelastic parameters of asphalt specimens, mathematical estimation was performed using matlab software and based on burger model. The results show that before the third phase of creep curve, the experimental curve has a good conformity with burger model. All the determinations that are achived by Burger model have a correlation coefficient more than 90 % . It shows that burger model is able to determine the viscoelastic behavior of asphalt mixture in the range of applied stress and temperature. The results of dynamic creep test show the increase of Flow Number in all test temperatures and levels of stress. It was more than 60 % in 100kPa stress level and even more than 100% at 300kPa stress level. In addition, the Flow Number obtained from dynamic creep test shows that by adding activated carbon to the hot mix asphalt, the mixture properties can be improved against rutting at high temperatures and stress levels.

اصلاح قير , كربن فعال پودري , تحليل ويسكوالاستيك , مدل برگر , مخلوط آسفالت داغ , شيارشدگي

Bitumen Modification , Activated carbon powder , Viscoelastic analysis , Burger's model , Hot mix asphalt , Rutting

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Dr.Ameri