Optimizing the Durability and Functionality of PFC Surfaces Don Watson Test Track Sponsor Meeting May 11, 2011 1.

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Presentation transcript:

Optimizing the Durability and Functionality of PFC Surfaces Don Watson Test Track Sponsor Meeting May 11,

Objective Durability Issues – Raveling – Crack Resistance Functionality Issues – Permeability – Smoothness – Structural Value 2

– Raveling – Crack Resistance Durability Issues 3

4 Raveling

Change in Texture with Traffic 5

Crack Resistance 6

PFC Surface Cracks (Tack Method) 2006 crack susceptible dense Superpave mix – Surface cracks after 1.9M ESALs (Rehab at 5.6M) 2009 PFC surface placed with conventional tack – Surface cracks after 2.2M (cracking/pumping at 8.2M) 2009 bonded PFC surface placed with spray paver – Surface cracks after 4.1M (looks good at 8.2M) 7

OGFC Surface Cracks (Tack Method) Conventional Tack Bonded 8

5/2/2011 Crack Maps (N2 / N1) 9

– Permeability – Smoothness – Structural Value Functionality Issues 10

Permeability 11

Same Mix Drains Better at 1¼” N1 - ¾” Bonded N2 - ¾” Tacked S8 - 1¼” Tacked 12

Smoothness 13

Change in Smoothness with Traffic 14

Structural Value 15

Structural Contribution of OGFC 16

Similar Rutting Performance 17

Similar Strain Response 50% RAP Virgin Mixes 18

Questions?? 19