LONG LIFE PAVEMENTS

Peter VacuraChief, Office of Asphalt Pavement

Pavement Program

California Asphalt Pavement AssociationFall Conference

October 24, 2013

PRESENTATION OVERVIEW

• Pavement Selection• Testing• Design (CalME)• Performance Specifications• Lessons Learned

Pavement Project Selection

• Identify location with long life

in mind

• Rehabilitation projects

• Life Cycle Costs/Scoping

Document

• Program project for SHOPP

Cycle

Testing

• As-builts of existing roadway

• Verify with coring and GPR

• Identify possible binder and

aggregate sources for testing

• Preliminary shear/fatigue

testing

Design (CalME)

• Mechanistic Empirical approach

• Design for over 40 years

• Building materials library

• Based on Shear and Fatigue

testing

• Establish Performance

Requirements

Performance Specifications

• Based on Shear, Fatigue,

Stiffness

• Meet certain levels of

repetitions

• Beyond standard mix design

• Investigating Asphalt Material

Performance Tester (AMPT)

MIX DESIGN BASED ON ‘MECHANISTIC/PERFORMANC

E’ LAB TESTING

• Hveem (CT 366) • Shear Testing (T 320)• Fatigue Testing (T 321)• Hamburg WT (T 324)

LESSONS LEARNED• New to industry

Complex data analysis and presentation

Currently looking at ways to simplify process • Present test results more straight forward manner

• Availability of testing labs• Testing time

LESSONS LEARNED

• Pre-bid conference for potential bidders very beneficial

• Partnering Meeting used to ensure an understanding by the contractor and testing laboratory of the performance test procedures

LESSONS LEARNED

• Anticipate the need for multiple mix designs/iterations.

• Schedule mix design and testing as soon as possible

• Ensure sufficient testing capacity is available

LOOKING FORWARD

• Reevaluate performance requirements (shear, fatigue)

• Building of Materials Library

• Investigate AMPT as an alternate to the shear tester (AASHTO T-320)

• Pre-award qualification of mix design(s)

Thank you