Maluke, NMturi, George AJHesp, SAM2018-10-232018-10-232018-10Maluke, N., Mturi, G.A.J. and Hesp, S.A.M. 2018. Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life. 2018 SARF/IRF/PIARC, Durban ICC, 9-11 October 2018http://www.sarf-irf2018.co.za/wp-content/uploads/2018/10/Mturi-G.pdfhttp://hdl.handle.net/10204/10489Paper presented at 2018 SARF/IRF/PIARC, Durban ICC, 9-11 October 2018In South Africa, over the last two decades, there has been a need to improve on the ductility specification test and to better simulate ageing of the asphalt bitumen in the laboratory for the control of fatigue cracking distress. Focusing on the former, various extensional tests have been recommended to replace the ductility test. Initially, this brought the Force-Ductility (FD) test to South Africa followed by a wave of surrogate Dynamic Shear Rheometer (DSR) protocols. More recently, the Double-Edge-Notched Tension (DENT) test has been introduced. This paper aims to compare these extensional tests and their surrogates with Four-Point Bending Beam (4-PBB) asphalt mixture fatigue results of various bitumen, using similar mix designs in terms of binder content, voids, gradation and aggregate types. The DENT test provides a measure of strain tolerance in the ductile state under severe constraint, expressed as the approximate Critical Crack Tip Opening Displacement (CTOD). The CTOD property was identified to be the most accurate in relation to asphalt mixture fatigue life. This paper discusses the significance of CTOD as an improved parameter for predicting fatigue life in South African asphalt mixtures.enDENT testDuctilityExtensional propertiesFatigue behaviourHot mix asphaltConference PresentationMaluke, N., Mturi, G. A., & Hesp, S. (2018). Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life. http://hdl.handle.net/10204/10489Maluke, N, George AJ Mturi, and SAM Hesp. "Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life." (2018): http://hdl.handle.net/10204/10489Maluke N, Mturi GA, Hesp S, Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life; 2018. http://hdl.handle.net/10204/10489 .TY - Conference Presentation AU - Maluke, N AU - Mturi, George AJ AU - Hesp, SAM AB - In South Africa, over the last two decades, there has been a need to improve on the ductility specification test and to better simulate ageing of the asphalt bitumen in the laboratory for the control of fatigue cracking distress. Focusing on the former, various extensional tests have been recommended to replace the ductility test. Initially, this brought the Force-Ductility (FD) test to South Africa followed by a wave of surrogate Dynamic Shear Rheometer (DSR) protocols. More recently, the Double-Edge-Notched Tension (DENT) test has been introduced. This paper aims to compare these extensional tests and their surrogates with Four-Point Bending Beam (4-PBB) asphalt mixture fatigue results of various bitumen, using similar mix designs in terms of binder content, voids, gradation and aggregate types. The DENT test provides a measure of strain tolerance in the ductile state under severe constraint, expressed as the approximate Critical Crack Tip Opening Displacement (CTOD). The CTOD property was identified to be the most accurate in relation to asphalt mixture fatigue life. This paper discusses the significance of CTOD as an improved parameter for predicting fatigue life in South African asphalt mixtures. DA - 2018-10 DB - ResearchSpace DP - CSIR KW - DENT test KW - Ductility KW - Extensional properties KW - Fatigue behaviour KW - Hot mix asphalt LK - https://researchspace.csir.co.za PY - 2018 T1 - Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life TI - Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life UR - http://hdl.handle.net/10204/10489 ER -