2. Aging behavior of asphalt

Most of the coating systems are located at moderate temperatures. The asphalt cement has both a fluid and an elastic solid character. Since the asphalt is an organic material, it reacts with the surrounding oxygen. Oxidation changes the structure and complexity of asphalt molecules. Oxidation causes to oxidation on the asphalt, aging or hardening, leading to further fractures.

Oxidation occurs more rapidly at higher temperatures. When the asphalt cement is heated, mixed more easily and compressed, the amount of breakage is considerable. The characteristics of asphalt cement under temperature changes and loading rates and aging stages are determined by their ability to perform as a binder in coating systems.

Asphalt cement within the coating; it is hardened under the influence of air, environmental condition and heat during the service life. It is occurred aging hardening and viscosity increase in the bitumen over the time. In the bitumen subjected to aging hardening, lower penetration and higher viscosity are seen, and it is stated that aging hardening results in lower adhesion and brittle fracture.

The aging index of asphalt is shown the following Figure 1 in term of years.

Figure 1. Asphalt aging index by years [27].

different moisture induced distresses such as raveling, potholes, respectively. Therefore, various additives are used as modifiers to improve the engineering properties of the bitumen

The investigations in asphalt pavement technology and its application fields have enabled the development and practical use of polymer modifiers. A number of researches have been

Various additives which are called modifiers have been contributed binder to increase the performance of asphalt. Modifiers are provided long term service life of asphalt and prevented

Polymer has been used commonly with asphalt for nearly 50 years as of additives. Many tests

The traffic load and temperature cause the asphalt coating to lose strength over time. SBS Block Copolymer is used commonly with binders in order to ensure the high quality of materials, increase the endurance of binder and hot mix asphalt pavement. Many studies have been found that Modified asphalt with SBS provided to endurance rutting in high temperature,

Hamid et al. determined different types of HMAs which are prepared with grinded and nongrinded SBS polymers. It was seen better result with grinded SBS polymer modifier. According to the test result, it was determined that there was slight increase in the air gap and aggregate

Qadi et al. probed the effect of multiple additives and modifiers on asphalt pavement. Polyphosphoric acid (PPA), liquid anti strip (LAS), and hydrated lime were selected for using of laboratory study. It was seen that the moisture sensitivity in asphalt mixtures decreased

Styrene butadiene styrene copolymers (SBSC) are classified as thermoplastic elastomers because of their elastic and thermoplastic characteristics, and are used as modifiers for the bitumen because of their important features contributing to the mechanical properties of the

In numerical studies, it is performed Abaqus and Ansys program are widely used with nonlinear viscoplastic finite element model (FEM) analysis. Furthermore; Due to the longitudinal dimension, 2- and 3-dimensional models are generally approved for the design of modeling

Most of the coating systems are located at moderate temperatures. The asphalt cement has both a fluid and an elastic solid character. Since the asphalt is an organic material, it reacts with the surrounding oxygen. Oxidation changes the structure and complexity of asphalt

are being applied for increasing the properties of asphalt combination. [3].

volume, and endurance to stresses increased and the density decreased.

material. The most commonly used modifiers are polymers.

carried out to investigate in asphalt pavement [1–15].

fatigue behavior and low temperature cracking [17–20].

when used of Liquid Anti Stripe and hydrated lime [21].

them long term aging [17–20].

22 Modified Asphalt

asphalt [22–24].

2. Aging behavior of asphalt

[25, 26].
