Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of Mixture Design and Tensile Characteristics of Polyvinyl Alcohol (PVA)–Fiber Reinforced HMA Mixtures
Extensive research studies have been conducted to assess the fracture performance of hot mix asphalt (HMA) reinforced with various fiber types, dosages, and aspect ratios. The effect of aggregate gradation and binder grades on the fracture performance of fiber reinforced mixes, however, was the subject of a few investigations. This study adopted a methodical approach to evaluate the impact of three different coarse and fine aggregate gradations with different nominal maximum sizes using three different binder grades and varying Polyvinyl Alcohol (PVA) fiber content. Superpave mix design procedure was used to develop various HMA mixtures, while indirect tensile strength (ITS) was performed to evaluate several fracture characteristics of PVA fiber reinforced HMA. Results of tested modified mixtures showed increase in optimum asphalt content regardless of gradation type and binder grade. All mixtures passed the minimum threshold criteria of 80% tensile strength ratio for moisture induced sensitivity. The experimental result presented a substantial improvement of stiffness modulus, total fracture energy and dissipated creep strain energy for intermediate grade binder at PVA content of 0.3% and 0.1% for respective coarse and fine graded mixtures. Furthermore, Digital imaging correlation (DIC) analysis revealed more strain distribution, and a higher tortuous path of crack propagation with lower grade PG 58-22 binder and 12.5 mm coarse gradation. Scanning electron microscopy micrographs revealed better adhesion due to asphalt coating and effective fiber bridging across the crack thus enhancing post peak deformation behavior under tensile loading.
Evaluation of Mixture Design and Tensile Characteristics of Polyvinyl Alcohol (PVA)–Fiber Reinforced HMA Mixtures
Extensive research studies have been conducted to assess the fracture performance of hot mix asphalt (HMA) reinforced with various fiber types, dosages, and aspect ratios. The effect of aggregate gradation and binder grades on the fracture performance of fiber reinforced mixes, however, was the subject of a few investigations. This study adopted a methodical approach to evaluate the impact of three different coarse and fine aggregate gradations with different nominal maximum sizes using three different binder grades and varying Polyvinyl Alcohol (PVA) fiber content. Superpave mix design procedure was used to develop various HMA mixtures, while indirect tensile strength (ITS) was performed to evaluate several fracture characteristics of PVA fiber reinforced HMA. Results of tested modified mixtures showed increase in optimum asphalt content regardless of gradation type and binder grade. All mixtures passed the minimum threshold criteria of 80% tensile strength ratio for moisture induced sensitivity. The experimental result presented a substantial improvement of stiffness modulus, total fracture energy and dissipated creep strain energy for intermediate grade binder at PVA content of 0.3% and 0.1% for respective coarse and fine graded mixtures. Furthermore, Digital imaging correlation (DIC) analysis revealed more strain distribution, and a higher tortuous path of crack propagation with lower grade PG 58-22 binder and 12.5 mm coarse gradation. Scanning electron microscopy micrographs revealed better adhesion due to asphalt coating and effective fiber bridging across the crack thus enhancing post peak deformation behavior under tensile loading.
Evaluation of Mixture Design and Tensile Characteristics of Polyvinyl Alcohol (PVA)–Fiber Reinforced HMA Mixtures
Int. J. Pavement Res. Technol.
Asghar, Muhammad Faizan (Autor:in) / Khattak, Mohammad Jamal (Autor:in)
International Journal of Pavement Research and Technology ; 17 ; 258-279
01.01.2024
22 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Polyvinyl Alcohol Fiber-Reinforced Mortars for Masonry Applications
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Polyvinyl Alcohol Fiber-Reinforced Mortars for Masonry Applications
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