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 ENGINEERING

Design, 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 life

Minimize long-term environmental effects

Reduced 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 PAVEMENT

What 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

DEFLECTION

How 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 MATERIALS

Material Cost per cubic inch

Sand $0.30Paver Base Sand

(gravel)$0.35

Pea Stone $0.20Red Clay $0.50

Air Dry (White Clay)

$0.50

Compacted Rubber

$0.45