This document discusses using recycled industrial materials in roadways. It notes that over half a billion tons of potentially reusable materials are produced by industries each year in the US. These materials can be used as substitutes for raw materials in construction projects like roads and buildings. Some examples of reusable industrial materials mentioned are coal combustion products, construction and demolition waste, used tires, and blast furnace slag. The document outlines environmental, economic, and performance benefits of using these recycled materials in roadways, such as reducing pollution and costs while improving road durability.

1. USING RECYCLED
INDUSTRIAL
MATERIALS IN ROADWAYS

2. INTRODUCTION

Each year in the United
States, industries produce over ½ a
billion tons of potentially usable
materials.

Many have chemical and physical
properties that make them valuable
resources when recycled or
beneficially reused, but they are
often disposed of as waste.

These materials can be used as
substitutions for raw materials in the
manufacture of consumer
products, roads, bridges, buildings
and other construction projects.

3. QUESTION??

Each year in the
United
States, industries
produce over ½ a
billion tons of
potentially usable
materials…
 What
could be a
usable material??

4. DEFINITIONS

Fly Ash - residue generated in the
combustion of coal

Bottom Ash - non-combustible residue
of the combustion of coal

Aggregate - sand, gravel, crushed
stone, slag

Slag - during smelting, when metals
such as iron, copper, lead or nickel are
exposed to high temperatures,
impurities are separated from the
molten metal and can be removed. Slag
is the collection of compounds that are
removed.

5. DISCUSSION
Why do we need coal?
What do we make with sand, gravel and
stone?

6. REUSABLE MATERIALS
- Coal combustion products (CCPs)
- Construction and demolition (C&D)
materials
- Used tires
- Compost
- Pulp and paper byproducts
- Bottom ash
- Foundry sand
- Reclaimed concrete and asphalt
- Glass
- Roofing shingles
- Blast furnace slag
- Steel slag
- Scrap tires
- Fly ash

7. WHY USE INDUSTRIAL MATERIALS IN ROADWAYS?
Environmental Benefits
Economic Benefits
Performance Benefits

8. ENVIRONMENTAL BENEFITS

Many industrial materials are used to
replace nonrenewable virgin materials that
must be mined and processed.

Using industrial materials conserves
natural resources and reduces the energy
use and pollution associated with these
activities.

Roads and other structures made with
industrial materials can be more durable.


Maintaining and replacing roads less frequently is
good for the environment because it conserves
natural resources and energy.
Substituting fly ash (a CCP) for cement in concrete
saves the energy and greenhouse gas emissions
associated with producing cement.

9. ECONOMIC BENEFITS

Using industrial materials makes good
economic sense for project owners and
contractors.

Industrial materials are often less
expensive than the virgin materials they
replace.

Recycling or reusing materials onsite can
reduce material hauling and disposal
costs.

Reduces the need for new or expanded
landfills, saving valuable landfill capacity.

The total project bid cost can be
lower, allowing the project owner to
accomplish more work with the same
budget.

10. PERFORMANCE BENEFITS

Asphalt pavement made with used tires is more flexible, quieter and less
prone to cracking than standard asphalt pavement.

Rubber tires used as lightweight fill material offer outstanding long-term
performance benefits and are less expensive than many alternatives.

Using fly ash as a partial replacement for cement in concrete enhances
the durability and smoothness of the concrete.

11. BASIC ROAD LAYERS

12. CAREERS IN TRANSPORTATION

13. ACTIVITY: FIX THE ROAD GAP

Divide into groups of 2-3

Design the section of the
road (remember the
layers)

Construct a section of road
out of given recycled
materials so that a truck
may pass over

Road must be
compacted, smooth and
dry

The truck must be able to
roll over the constructed
road section only using
gravity as a force

Choose one group
member to explain the
design process

Prizes will be given for
best design and field test

14. PROJECT LAYOUT