Grading Asphalt Binders with the Multiple Stress Creep Recovery Test AASHTO TP-70 and MP-19 “The Future is Coming”. Karl Zipf DelDOT February 2014. WARNING. Brief History of the Test. DTFH61-08-H-0003 – Cooperative Agreement between the FHWA and the Asphalt Institute - PowerPoint PPT Presentation
Text of Karl Zipf DelDOT February 2014
Grading Asphalt Binders with theMultiple Stress Creep Recovery Test
AASHTO TP-70 and MP-19
“The Future is Coming”
Brief History of the Test
• DTFH61-08-H-0003 – Cooperative Agreement between the FHWA and the Asphalt Institute
• John A. D’Angelo (FHWA)• Asphalt Binder ETG• Member Companies of the Asphalt Institute –
Technical Advisory Committee
• The present test methods for asphalt binder grading do not adequately characterize rutting or polymer-modified asphalts (PMA).
• The current PG System (AASHTO M-320) is blind to modification and requires PG plus tests such as Elastic Recovery to characterize PMA binders.
• The PG system was supposed to reduce rutting but over the past decade and a half it has not
The New Asphalt Binder Test• Uses the DSR which labs already
have.• Runs the sample 10 times. Load
MSCR Test Data
• The test gives two values which are the basis of the standards, TP-70 and MP-19.
• Jnr – Nonrecoverable creep compliance for 10 cycles at a creep stress of 3.2 kPa
• % Average Recovery at a creep stress of 3.2 kPa
The New Asphalt Binder Test
What’s in a Name
• SHRP (Sharp) – Strategic Highway Research Program