Upcoming Priorities
Track 1 Performance-Based Concrete Pavement Mix Design System
Priority: Start now
Air content:
How much is needed? Measurements and variability. Test methods.
Combined grading:
How to specify? How to pay for it?
Cement content:
Should a minimum be specified? What performance is affected?
Priority: Start soon
Who decides what (the perfect specification):
Engineer's decisions, supplier's decisions
Rejection:
When should a truck be rejected? When should a new slab be removed and replaced? When should an old slab be removed and replaced?
Marginal materials:
Tests, limits
Sustainability:
"Optimized" structural design. "Optimized" mix proportions. Recycled materials.
Priority: Start later
Uniformity:
Monitoring, accommodating, specifying limits
Correlation between tests and life:
Fresh concrete, young concrete, old concrete