In this paper, the micromorphology of asphalt binders with wax warm additives is investigated by atomic force microscopy (AFM) and optical microscopy before and after aging. Performance grade (PG) 64-22 asphalt binder is used to produce warm mix asphalt binder containing two wax additives, LEADCAP and Sasobit, and then the warm binders are artificially short-term and long-term aged using the rolling thin film oven (RTFO) and pressure aging vessel (PAV) procedures. Microstructure and rheology properties of the binders are characterized using AFM tapping-mode imaging techniques and the Superpave asphalt binder test, respectively. The results of this study indicate that (1) the wax type and aging level have a significant effect on the micromorphology of the binders; (2) the binders with LEADCAP exhibit no “bee-like” structures; (3) the addition of Sasobit into the binder increases the dimension of the bee-like structures regardless of the aging level and binder types; (4) the dispersed domain has higher stiffness than does the para phase; (5) the aging of the binders increases the bee shape but reduces the number of the structures; (6) the expanded peri phase is observed after the aging; and (7) the binder roughness increases after aging and shows a good relationship with the stiffness results.

Abrasion resistance is a crucial factor in pavement concrete durability, influenced by compressive strength, surface finishing and curing techniques, aggregate characteristics, and testing conditions. Research shows that improving concrete’s abrasion resistance through proper mix design, additives like fibers and silica fume, and optimal curing practices can extend its service life by reducing wear from traffic and environmental forces, but concrete remains vulnerable to abrasion over time. This is a comprehensive review investigating the abrasion resistance in concrete pavements. It explores the mechanisms of abrasion resistance and standard testing methods. It then delves into the numerous factors affecting abrasion resistance, focusing on material properties (aggregates, cement type, admixtures, and water–cement ratio), pavement design (surface texture and reinforcement), and environmental conditions. Finally, the review examines advancements in enhancing abrasion resistance, including new materials and technologies, and concludes by highlighting current limitations in understanding the phenomenon and suggesting avenues for future research. This paper aims to provide a better understanding of materials, techniques, and predictive models to enhance abrasion resistance, which is crucial for enhancing the durability and longevity of concrete pavements.

Concrete’s coefficient of thermal expansion (CTE) is a critical property affecting the durability and performance of rigid pavements. This review paper examines the significance of CTE in pavement design and the factors influencing it, including the type of aggregate, cement composition, age, relative humidity, and curing conditions. Thermal stress due to temperature changes and moisture variation can lead to cracking, spalling, and warping in concrete pavements, impacting their performance. The paper also discusses experimental methods for measuring CTE, alongside recent advances like mechanistic–empirical pavement design and prediction models. Integrating CTE considerations into pavement design enhances the predictive accuracy of pavement performance, particularly in addressing issues like joint movement and cracking. By comprehensive literature review and synthesizing current research, the paper emphasizes the importance of integrating CTE considerations into pavement design for improved durability and performance predictions. The paper emphasizes the importance of integrating CTE considerations into pavement design for improved durability and performance predictions.

The study presents an experimental evaluation to improve the resistivity of binders with “Styrene-Butadiene-Styrene” (SBS) and “Processed oil” by studying the physical properties, rheology, and cracking. For this experiment, PG 64-22 was mixed with SBS at different percentages of 5%, 10%, and 15% by weight of the original binder with two processed oil contents of 6% and 12% by weight of the binder. Laboratory tests have been conducted at various high, medium, and low temperature ranges to evaluate their properties. The processed oil polymer modified asphalt (PMA) binder is artificially aged in both the short and long-term using a Rolling Thin Film Oven (RTFO) and a Pressure Aging Vessel (PAV). The Superpave testing method was performed on modified binders using a Rotational Viscometer (RV), Dynamic Shear Rheometer (DSR), and Bending Beam Rheometer (BBR). The results of this study illustrate (1) The addition of SBS leads to higher viscosity, but the co-modification of asphalt binder with the processed oil shows a significant modulation of the viscosity value. (2) In addition, processed oil reduced the resistance to rutting, but the addition of SBS significantly improved the rutting resistance of the asphalt binder. (3) The addition of SBS and processed oil improved the value of G sin δ, notably. (4) According to BBR, it has been shown that the addition of SBS in addition to the processed oil improves the stiffness values of modified asphalt binders.

Crumb rubber binder with thermoplastic polyurethane (TPU) has been experimented with to characterize the performance properties considering the workability, rutting, fatigue cracking and cracking resistance at low temperatures depending on the temperatures and aging states. Physical and rheological properties were evaluated to proceed with the study by applying Superpave asphalt binder testing and multi-stress creep recovery (MSCR). Based on the targeted experiments, the binder samples were produced at three aging states (original, short-term aged and long-term aged) using a rolling thin film oven (RTFO) and pressure aging vessel (PAV). The results revealed that (i) the addition of TPU into CRM binders has a potential effect on increasing viscoelasticity at the original condition, (ii) CRM binders containing TPU showed improved anti-aging performance based on results of RTFO residues and (iii) the inclusion of TPU made it possible for CRM asphalt binder to improve its fatigue and cracking resistance at low temperature.