Surface Texture: The Perception
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SURFACE TEXTURE: THE PERCEPTION Steven R Marvin, PE CalAPA Pavement Conference April 2016
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Transcript of Surface Texture: The Perception
SURFACE TEXTURE:THE PERCEPTION
Steven R Marvin, PECalAPA Pavement Conference April 2016
RESEARCH When searching for pavement texture
What is the public/owners looking for? Black and beautiful? White reflective topping? Smooth?
Let’s ask Google
GOOGLE PAVEMENT TEXTURE
GOOGLE PAVEMENT TEXTURE
GOOGLE PAVEMENT TEXTURE
GOOGLE PAVEMENT TEXTURE
CHANGE SEARCH PARAMETERS Asphalt Concrete Texture
More Concrete Pictures Asphalt Concrete Pavement Texture
Finally Asphalt Concrete Pictures
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
GOOGLE ASPHALT CONCRETE PAVEMENT SURFACE TEXTURE
WHY THEN DOES ANYONE SELECT ASPHALT CONCRETE?
Appearance? Apparently not
Smooth ride? How is that applicable to parking lots?
Constructability? Cost?
We therefore base our lively hood on being cheap?
WHY DO OWNERS LOOK AT THEIR PAVEMENTS?
Pavement performance is consistent with expectations Proactive pavement owners
Cities and Counties State Airports Seaports
Commercial property owners Image driven Performance/budget driven -
WHY DO OWNERS LOOK AT THEIR PAVEMENTS?
Pavement performance is not consistent with expectations Government agencies Commercial property owners/managers Small property owners Home owner associations Attorneys
WHY DO OWNERS LOOK AT THEIR PAVEMENTS?
Pavement appearance is suspect Attorneys Attorneys Attorneys Attorneys
HOW CLOSELY DO THEY LOOK?
HOW CLOSELY DO THEY LOOK?
HOW CLOSELY DO THEY LOOK?
APPEARANCE DETAILS DEFINE QUALITY DETAILS CONTRIBUTE TO SUCCESSFUL
PROJECTS DETAILS SELL THE JOB DETAILS AVOID LAWSUITS
WHAT DOES NOT DIRECTLY DEFINE APPEARANCE?
Stability Voids in Mineral Aggregate Retained Strength Air Voids Voids Filled with Bitumen Binder Content * Relative Compaction *
WHAT DEFINES SUITABLE APPEARANCE Roller cuts Roller checks Joints Surface Uniformity
Color Smoothness Texture
Design gradation Material Supplier ‘apparent’ gradation Segregation
SO, WHAT IS THE TEXTURE? What is the texture of asphalt
concrete? Open graded Dense graded Exposed aggregate Rock salt finish Smooth trowel Rough broom
Why don’t we ever speak of the texture?
WHAT DO WE SEE? Color
SIZE SIEVE SIZES
#4, #8, #16, #30, #40, #50, #80, #100, #200, #270
SANDPAPER 270 grit 200 grit 100 grit 40 grit Coarse
MATERIAL SUPPLIERS
MATERIAL HANDLING
MATERIAL HANDLING
MATERIAL HANDLING
AND NOW WE RECYCLE
AND NOW WE RECYCLE
AND NOW WE RECYCLE
AND NOW WE RECYCLE
AND NOW WE RECYCLE
AND NOW WE RECYCLE
AND NOW WE RECYCLE
HOW DOES RECYCLE IMPACT APPEARANCE?
All lumps are not created equal
HOW DOES RECYCLE IMPACT APPEARANCE?
Lumps test varies from appearance
HOW DOES RECYCLE IMPACT APPEARANCE?
Solid Center
IMPACT ON APPEARANCE Quality control is based on extracted
gradations Extractions expose the ‘centers’
Visual perceptions is based on as received gradations Visual as received conditions remained
coated It is nice to fool mother nature
Understand the variables Take advantage of the opportunities
WHAT DO WE NEED TO DO? Accept recycle is here to stay Recycling has included
Glass Ceramics Auto wrecking yard waste
WHAT DO WE NEED TO DO? Recycling now includes
Rubber tires Tire rubber Roofing material
Manufacturer ‘tear offs’ Old roofs
Simple shingles Built up roofs
WHAT DO WE NEED TO DO? Crushed Portland cement concrete Crushed asphalt concrete
Playgrounds Parking lots Local roadways Highways Airports Seaports
WHAT DO WE NEED TO DO? Order surface materials from single source
Single supplier Single plant
Understand implications of recycled materials Finish appearances are impacted
10% is different than 15% is different than 20%, etc, etc Select materials with defined and specified
gradations What is ½” fine with 20% or more recycled
materials?
WHAT DO WE NEED TO DO? Train our people to handle materials
properly Avoid segregation for general paving
Limit use of paver wings Match auger and screed widths Proper joint raking
Use aggregate segregation to your advantage
Purposely segregate materials in hand work areas
Use aggregate segregation to our advantage Discard course materials in hand work areas
WHAT DO WE NEED TO DO? Raise our understanding Raise our skills Change the perception of our product Change the perception of our industry RAISE THE PERFORMANCE BAR
