Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Toughening mechanisms in polypropylene fiber-reinforced asphalt mastic at low temperature
https://orcid.org/0000-0003-0159-0025
Highlights The addition of polypropylene fiber reinforcement significantly increases the tensile strength and fracture toughness of asphalt binder at low temperatures. Fiber bridging and fiber pull-out processes were experimentally and theoretically shown to be the dominant toughening mechanisms in these materials. Higher fiber contents for a constant fiber length result in higher strengths and fracture toughnesses at low temperatures. For the same fiber content, longer fibers resulted in higher strengths and fracture toughnesses. There is an optimum amount of fibers that can enhance the strength and fracture toughness while keeping the mix workable. That optimum polypropylene fiber content and length were obtained as 1.0% and 12 mm, respectively.
Abstract Low temperature cracking is a prevalent mechanism of failure in hot mix asphalt (HMA) pavements. Prolonged cold temperatures can lead to premature cracking and subsequent failure of pavements. It has been previously shown that fibers as additives can improve the mechanical properties of asphalt mastic (asphalt binder and filler material passing the 75 μm sieve). However, the success of any effort to evaluate the low-temperature behavior of the fiber-reinforced asphalt mastic is based on the understanding of the fracture and toughening mechanisms. The objective of this study was to develop an asphalt mastic with enhanced resistance against cracking with the use of small amounts of fiber. Here, the effects of fiber length and content in the asphalt mastic were studied to create an asphalt mastic with enhanced fracture toughness. The Single Edge Notched Three-point Bending (SENB) test was performed at low temperatures to measure the strength and fracture toughness for polypropylene fiber-reinforced asphalt mastic. The major conclusions were that both fiber length and content improved the fracture properties of mastics significantly, and crack bridging and fiber pull-out were the two main toughening mechanisms in these materials.
Toughening mechanisms in polypropylene fiber-reinforced asphalt mastic at low temperature
https://orcid.org/0000-0003-0159-0025
Highlights The addition of polypropylene fiber reinforcement significantly increases the tensile strength and fracture toughness of asphalt binder at low temperatures. Fiber bridging and fiber pull-out processes were experimentally and theoretically shown to be the dominant toughening mechanisms in these materials. Higher fiber contents for a constant fiber length result in higher strengths and fracture toughnesses at low temperatures. For the same fiber content, longer fibers resulted in higher strengths and fracture toughnesses. There is an optimum amount of fibers that can enhance the strength and fracture toughness while keeping the mix workable. That optimum polypropylene fiber content and length were obtained as 1.0% and 12 mm, respectively.
Abstract Low temperature cracking is a prevalent mechanism of failure in hot mix asphalt (HMA) pavements. Prolonged cold temperatures can lead to premature cracking and subsequent failure of pavements. It has been previously shown that fibers as additives can improve the mechanical properties of asphalt mastic (asphalt binder and filler material passing the 75 μm sieve). However, the success of any effort to evaluate the low-temperature behavior of the fiber-reinforced asphalt mastic is based on the understanding of the fracture and toughening mechanisms. The objective of this study was to develop an asphalt mastic with enhanced resistance against cracking with the use of small amounts of fiber. Here, the effects of fiber length and content in the asphalt mastic were studied to create an asphalt mastic with enhanced fracture toughness. The Single Edge Notched Three-point Bending (SENB) test was performed at low temperatures to measure the strength and fracture toughness for polypropylene fiber-reinforced asphalt mastic. The major conclusions were that both fiber length and content improved the fracture properties of mastics significantly, and crack bridging and fiber pull-out were the two main toughening mechanisms in these materials.
Toughening mechanisms in polypropylene fiber-reinforced asphalt mastic at low temperature
https://orcid.org/0000-0003-0159-0025
Highlights The addition of polypropylene fiber reinforcement significantly increases the tensile strength and fracture toughness of asphalt binder at low temperatures. Fiber bridging and fiber pull-out processes were experimentally and theoretically shown to be the dominant toughening mechanisms in these materials. Higher fiber contents for a constant fiber length result in higher strengths and fracture toughnesses at low temperatures. For the same fiber content, longer fibers resulted in higher strengths and fracture toughnesses. There is an optimum amount of fibers that can enhance the strength and fracture toughness while keeping the mix workable. That optimum polypropylene fiber content and length were obtained as 1.0% and 12 mm, respectively.
Abstract Low temperature cracking is a prevalent mechanism of failure in hot mix asphalt (HMA) pavements. Prolonged cold temperatures can lead to premature cracking and subsequent failure of pavements. It has been previously shown that fibers as additives can improve the mechanical properties of asphalt mastic (asphalt binder and filler material passing the 75 μm sieve). However, the success of any effort to evaluate the low-temperature behavior of the fiber-reinforced asphalt mastic is based on the understanding of the fracture and toughening mechanisms. The objective of this study was to develop an asphalt mastic with enhanced resistance against cracking with the use of small amounts of fiber. Here, the effects of fiber length and content in the asphalt mastic were studied to create an asphalt mastic with enhanced fracture toughness. The Single Edge Notched Three-point Bending (SENB) test was performed at low temperatures to measure the strength and fracture toughness for polypropylene fiber-reinforced asphalt mastic. The major conclusions were that both fiber length and content improved the fracture properties of mastics significantly, and crack bridging and fiber pull-out were the two main toughening mechanisms in these materials.
Toughening mechanisms in polypropylene fiber-reinforced asphalt mastic at low temperature
Wang, Shuai (Autor:in) / Mallick, Rajib B. (Autor:in) / Rahbar, Nima (Autor:in)
06.03.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Mechanism and behavior of fiber-reinforced asphalt mastic at high temperature
| Taylor & Francis Verlag | 2018
Engineering Index Backfile | 1933