PAVEMENT PRESERVATION AND DESIGN: AN OVERVIEW
U S D O T U TC I N T R O D U C T I O N T O H I G H WAY PAV E M E N T P R E S E RVAT I O N ( C H P P )
OVERVIEW Civil Engineering Transportation and Pavement
Engineering Sustainability and Preservation
Concepts in Asphalt Pavements Testing Pavement Deflection Your Engineering Challenge
Civil engineers work on projects that touch nearly all facets of every day life
the buildings we live and work in the network of transportation, water
and power systems that support modern life and business
and projects we use to sustain and repair the environment that we all share
CIVIL ENGINEERING
CIVIL ENGINEERING DEPARTMENTS
Structural Engineering Transportation
Engineering Pavement Engineering Geotechnical Engineering Construction Engineering Hydraulics & Water
Resources Environmental
Engineering
TRANSPORTATION ENGINEERING
Transportation Engineers apply scientific principles to planning, design, construction, operation, & management of transportation systems.
TRANSPORTATION ENGINEERING
Design, operate, manage…
ROADWAYS
AIRPORTS AND RUNWAYS
PORTS AND TERMINALS
PAVEMENT ENGINEERINGPavement Engineers apply scientific principles to planning, design, construction, operation, & management of systems requiring pavement.
PAVEMENT ENGINEERINGDesign, analyze, create…
PAVEMENT DESIGN MATERIAL TECHNOLOGY
TRANSPORTATION AND PAVEMENT ENGINEERING
Need to know: - Mathematics- Physics- Mechanics- Statistics and Probability- Computer Programming
Always be concerned about environmental impacts!
SUSTAINABILITY AND PRESERVATION CONCEPTS IN
ASPHALT PAVEMENTS https://www.dropbox.com/s/v
tde8p9qt1tyaan/CPAR%20Video.mp4
CONCEPTS OF SUSTAINABILITY FOR ASPHALT PAVEMENTS
Longevity, increase service lifeMinimize long-term environmental
effectsReduced greenhouse emissions (e.g., CO2)
Reduced use of raw materialsRecycled asphalt pavements
Increased use of recycled materialsIncreased use of industrial by-products
Crumb (tire) rubber modified asphalt
THE PREMISE: REDUCE THE IMPACT AT THE PRODUCTION
LEVELLess energy used during production
= Less impact on the environment
RECYCLING EXISTING ASPHALT PAVEMENTS
Every year, about 100 million tons of pavement material is reclaimed, and about 95 percent of the total is returned to use in roads and highways.
This makes asphalt pavement America’s most recycled material.
CRUMB RUBBER MODIFIED HMA PAVEMENTS
Ground tire rubber + asphalt + aggregates
Asphalt rubber is the largest single market for ground rubber in the United States,
consuming an estimated 220 million pounds, or approximately 12 million tires annually. 14
DESIGN CONSTRAINTS IN PAVEMENT DESIGN
COST TIME MATERIALS
TESTING PAVEMENTWhat qualities make pavement “good”?
What do you want to test to see if pavement is “good”?
DEFLECTION- How much something changes
when a force (or load) is applied to it
- Goal for engineers: minimize deflection on pavement
DEFLECTIONHow do you measure it?
SENSORS!One type of sensor:
Piezoelectric Film Transducer as a Sensor
Wires connected to piezo
YOUR ENGINEERING CHALLENGE
APPLY what you have learned
about sustainability in asphalt
design to DESIGN, BUILD, and
TEST a sample of pavement
YOUR ENGINEERING CHALLENGE
1) GOAL: LEAST amount of deflection (measured with piezo and oscilloscope)
2) COST: LEAST amount of cost (you will calculate this)
3) TIME: Must finish production and testing before the end of this session
4) MATERIALS: You can only use what is provided for your group
1) Use the JB Weld glue to glue the piezo onto the top layer FIRST (it takes about 10 min to dry)
2) You can mix any supply with any other supply.
3) Make sure to compact their layers
4) Water can be added to any layer, but you do not want it to “float”
5) The Geogrid is generally used after the first layer
YOUR ENGINEERING CHALLENGE: HELPFUL HINTS
YOUR ENGINEERING CHALLENGE: MEASUREMENTS
How you will measure…DEFLECTION:
- Piezo - Oscilloscope- Applied force (weight) dropped from specific height
COST: - Calculate the amount of money it costs to build your sample using the values on the next slide
COST OF MATERIALSMaterial Cost per cubic
inchSand $0.30
Paver Base Sand (gravel)
$0.35
Pea Stone $0.20Red Clay $0.50
Air Dry (White Clay)
$0.50
Compacted Rubber
$0.45