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Utilizing waste polyethylene for improved properties of asphalt binders and mixtures: A review

Assolie Amani Abdallah, Al-Migdady Abeer, Borowski Gabriel, Alsaqoor Sameh, Ali Ahmed Suliman B., Alahmer Ali

Advances in Science and Technology. Research Journal

2025

Vol. 19, no. 1

301--320

This review highlights the effects of adding to asphalt binder and asphalt mixtures, emphasizing its growing adoption globally due to environmental and economic advantages. The analysis evaluates the performance of asphalt binders and concrete mixtures modified with different forms of polyethylene (PE), including low-density polyethylene (LDPE) and high-density polyethylene (HDPE). The review revealed that incorporating waste polyethylene significantly enhances key properties of asphalt mixtures. Specifically, PE addition increases the softening point, viscosity, and specific gravity while reducing penetration. Furthermore, it improves the complex shear modulus, thermal stability, moisture resistance, and resistance to permanent deformation, although it may lead to a decrease in bulk density and creep rate of modified mixtures. The optimal PE content is recommended to be in the range of 4–12% by weight of binder, yielding substantial improvements in Marshall stability, flow, voids in mineral aggregates (VMA), air voids, dynamic modulus, and overall strength.

Mechanical Performance and Microstructure Evolution of Nano-Titanium dioxide Enhanced Cement – A Comprehensive Experimental Analysis

Salama Ahmed Hamed El-Sayed, Assolie Amani Abdallah, Alsafasfeh Ashraf

Advances in Science and Technology. Research Journal

2024

Vol. 18, no. 7

203--214

This study focuses on improving the mechanical properties and microstructure of cement-based materials, which are crucial for the durability and safety of construction projects. Conventional cement, although commonly used, has certain limitations in terms of its mechanical strength and durability. Therefore, there is a requirement for innovative methods to enhance these properties. This study investigates the potential of nano-TiO2 (titanium dioxide) as an additive to overcome these limitations. The objective of this research is to perform a thorough experimental analysis to examine how different concentrations of nano-TiO2 impact the mechanical performance and microstructural changes in cement paste and mortar. The study examines the influence of nano-TiO2 on the compressive and flexural strengths of cementitious materials. It also explores how nano-TiO2 modifies the microstructure to enhance compactness and resilience. The results suggest that incorporating nano-TiO2 into cement leads to a substantial improvement in both compressive and flexural strengths. This enhancement is particularly notable when the nano-TiO2 concentration is at an optimal level of 1.0% by weight. The SEM and XRD analyses demonstrate that this concentration enhances the microstructure by decreasing voids and facilitating the development of C-S-H crystals. However, excessive concentration may have negative consequences, such as the creation of extra empty spaces. The results indicate that nano-TiO2 has considerable promise in enhancing cement-based materials, thereby aiding the advancement of construction materials that are more long-lasting and effective. This study contributes to the knowledge of how nano-TiO2 improves cement and emphasizes its potential uses in the construction sector.