Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Laboratory evaluation of CCM parameters for mode-I cracks in HMAs
Abstract A series of experimental testing, data acquisition and analysis procedure to determine substantial fracture parameters for openning mode (mode-I) cracks in hot mix asphalt (HMA) has been developed. The cohesive crack model (CCM) has been adopted for the identification and evaluation of fracture parameters: Tensile strength; Fracture Energy; Critical Crack Opening Displacement; and Characteristics Crack Opening Displacement. The concept of pseudo fracture energy has been introduced to better account for nonlinear and time dependent fracture in HMAs. Behavioral trend between pseudo fracture energy and reduced strain rate agrees with that of fracture energy determined from LVDT measurements. At low temperatures, the fracture parameters remain constant irrespective of reduced strain rates. This implies that the Linear Elastic Fracture Mechanics (LEFM) could be applied for low temperature cracking in asphalt concrete. Finally, a better understanding of cracking mechanism relating to strain localization in a fracture process zone (FPZ) was achieved. Further study on characteristics of FPZ due to other cracking modes is necessary to bnefit the pavement performance model.
Laboratory evaluation of CCM parameters for mode-I cracks in HMAs
Abstract A series of experimental testing, data acquisition and analysis procedure to determine substantial fracture parameters for openning mode (mode-I) cracks in hot mix asphalt (HMA) has been developed. The cohesive crack model (CCM) has been adopted for the identification and evaluation of fracture parameters: Tensile strength; Fracture Energy; Critical Crack Opening Displacement; and Characteristics Crack Opening Displacement. The concept of pseudo fracture energy has been introduced to better account for nonlinear and time dependent fracture in HMAs. Behavioral trend between pseudo fracture energy and reduced strain rate agrees with that of fracture energy determined from LVDT measurements. At low temperatures, the fracture parameters remain constant irrespective of reduced strain rates. This implies that the Linear Elastic Fracture Mechanics (LEFM) could be applied for low temperature cracking in asphalt concrete. Finally, a better understanding of cracking mechanism relating to strain localization in a fracture process zone (FPZ) was achieved. Further study on characteristics of FPZ due to other cracking modes is necessary to bnefit the pavement performance model.
Laboratory evaluation of CCM parameters for mode-I cracks in HMAs
Seo, Youngguk (Autor:in) / Kim, Y. Richard (Autor:in) / Zhang, Zhiwang (Autor:in)
KSCE Journal of Civil Engineering ; 10 ; 201-206
01.05.2006
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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