An Evaluation of Elastic-Plastic Methods Applied to Crack Growth Resistance Measurements

2009 ◽  
pp. 288-288-19 ◽  
Author(s):  
DE McCabe ◽  
JD Landes
Keyword(s):  
Crack Growth ◽  
Crack Growth Resistance ◽  
Elastic Plastic

R-Curve Characterization of Crumb Rubber Modified Asphalt Mixtures Incorporating Warm Mix Additive at Low Temperatures

2021 ◽  
Vol 894 ◽  
pp. 109-114
Author(s):  
Sepehr Ghafari ◽  
Fereidoon Moghadas Nejad
Keyword(s):  
Crack Propagation ◽  
Crack Growth ◽  
Low Temperatures ◽  
Crumb Rubber ◽  
Crack Growth Resistance ◽  
Elastic Plastic ◽  
Performance Grade ◽  
Propagation Regime ◽  
Resistance Curves ◽  
Temperature Levels

In a previous research by authors, a methodology was developed to derive J-R curves for Hot Mix Asphalt (HMA) mixtures using an elastic-plastic approach where a comprehensive understanding of crack propagation regime could be achieved. In this research, the effect of crumb rubber modification of HMA binder is studied in terms of R-curves and crack propagation at low temperatures. Mode I Single edge notched beam (SE(B)) fracture tests were conducted in temperature levels of 0 °C, -10 °C, and -20 °C. PG58-22 and PG64-22 binders were used in the fabrication of HMA samples. Modified specimens consist of 20% crumb rubber along with the incorporation of 3% warm mix admixture. Crack growth resistance curves were obtained in SE(B) tests by means of image processing and recording of the progressive crack length. Elastic-plastic J-R curves revealed that crumb rubber modified mixtures exhibit higher crack growth resistance for each bitumen performance grade. As well, increased ductility and cohesive energy can be observed according to the R-curves as the mixtures are modified by crumb rubber.

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