Abstract
The objective of this research is to study the effect of adding Styrene Butadiene Styrene polymer SBS as a modifier on the mechanical properties of asphalt binder and hot mixtures asphalt (HMA) and to compare between the properties of the modified and unmodified asphalt binder and hot mixture asphalt (HMA) which is used in the rehabilitation of Baghdad province and Al-Basra province highway by paving the surface course of highway for areas suffers from problems such as rutting and cracks. There are two stages were used in the laboratory tests on asphalt binder and hot mixture asphalt (HMA). The first stage is used laboratory tests without using SBS polymer with asphalt and the second stage is used SBS Polymer with asphalt as an additive material. The results of asphalt binder tests show that the using of SBS Polymer with asphalt binder lead to improve the mechanical properties of asphalt binder. According to penetration test, the grade of asphalt is decreased from 61 and 62 to 39. The flash point, the ductility, and viscosity are increased and the solubility is decreased. The results of hot mixture asphalt test show that the adding of SBS polymer lead to improve the mechanical properties of modified hot mixture asphalt. Therefore, the Marshall stability for modified hot mixtures asphalt is increased for all samples. Therefore, the resistance to plastic flow and the load carrying capacity is improved by approximate more than 60%. The others Marshall properties such as Marshall flow, Marshall density, and Marshal air voids are improved. Therefore, the recommendation of this study is to use the modified hot mixture asphalt that is using Styrene Butadiene Styrene polymer SBS in the paving of new flexible pavement layers and in rehabilitation of the surface course of the old flexible pavement
Highlights
Pavement is an important in the construction of highway, runways, cars parking, and driveways
The objective of this research is to study the effect of adding Styrene Butadiene Styrene polymer SBS as a modifier on the mechanical properties of asphalt binder and hot mixture asphalt (HMA) and to compare between the properties of the modified and unmodified asphalt binder and hot mixture asphalt (HMA) which is used in the paving of surface course of Baghdad province and Al-Basra province highway in Iraq
From this study it can be concluded that the using of Styrene Butadiene Styrene polymer (SBS) to improve the mechanical properties of asphalt binder are effective and it will lead to improve the mechanical properties of hot mixture asphalt
Summary
Pavement is an important in the construction of highway, runways, cars parking, and driveways. Hot mixture asphalt (HMA) is used in the construction of flexible pavement, and it can be produced by mixing many different percents of aggregates and asphalt binder in an asphalt plant at elevated temperatures ranged between 300 and 350oF. The hot mixture asphalt pavement structural performance depends on the properties of asphalt binder, and external factors such as the volume of traffic and the environment conditions. The early failures of flexible pavement have many reasons Some of these reasons are due to high traffic loads and the others related to environmental conditions such as high temperature and moisture. The improvement or modifying of hot mixture asphalt (HMA) is an important to increase the structural performance of asphalt layer (surface layer) of pavement to resists the traffic loads and environmental conditions and to reduce the probability of different types of pavement failures. The objective of this research is to study the effect of adding Styrene Butadiene Styrene polymer SBS as a modifier on the mechanical properties of asphalt binder and hot mixture asphalt (HMA) and to compare between the properties of the modified and unmodified asphalt binder and hot mixture asphalt (HMA) which is used in the paving of surface course of Baghdad province and Al-Basra province highway in Iraq
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