USING RECYCLED INDUSTRIAL

MATERIALS IN ROADWAYS

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.

QUESTION??

Each year in the United States, industries produce over ½ a billion tons of potentially usable materials…

What could be a usable material??

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.

DISCUSSION

Why do we need coal?What do we make with sand, gravel

and stone?

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

WHY USE INDUSTRIAL MATERIALS IN ROADWAYS?

Environmental Benefits

Economic Benefits

Performance Benefits

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.

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.

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.

BASIC ROAD LAYERS

CAREERS IN TRANSPORTATION

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

PROJECT LAYOUT