Serving the needs of liquid asphalt manufacturers and suppliers worldwide since 1919.

INCLEMENT WEATHER INFORMATION
ASPHALT INSTITUTE FOUNDATION
ASPHALT MAGAZINE
R18LabQMS ®
THANK YOU FOR YOUR PATIENCE WHILE OUR WEBSITE IS UNDERGOING AN UPGRADE.
MEMBERS WILL BE UNABLE TO LOGIN DURING THIS TRANSITION.

Asphalt Maintenance and Rehabilitation

While there are an infinite number of questions that can be asked, we compiled a list of those questions that have been directed to us the most.

We tried to keep both the questions and answers concise. Additional information is referenced where applicable for those seeking more in-depth information on a given subject.

For further information see the other engineering areas, Asphalt magazine and APA websites, Asphalt Institute online store and the links page for other information related to these topic area.

We also recommend that you attend our Asphalt Academy courses at sites throughout the country to obtain expert instruction on asphalt topics.

Driveway Construction

Should construction crews be allowed to pave in the rain?
What does the Asphalt Institute say regarding pavement preservation and maintenance, including timing, distresses, materials, crack sealing, patching, and the various surface treatments options?
What do I need to know about building my asphalt driveway?

Seal-Coats

What does the Asphalt Institute say regarding pavement preservation and maintenance, including timing, distresses, materials, crack sealing, patching, and the various surface treatments options.
Should a newly paved driveway or parking lot be sealed (or seal-coated)?
When should a driveway or parking lot be sealed?
How should driveways and parking lots be sealed?

Chip Seals

What structural value does a chip seal add to a pavement?
When is the optimum time or season for chip seals?
Can chip seals be of multiple applications?
What type of equipment is needed for this application?
What are the benefits of a chip seal?
What is the average life of chip seal?
Why do the chips not adhere to the asphalt?
Do the chips need to be clean?
What is the best size?
How soon should the chips be spread after the asphalt application?
What is a Cape seal?
What type asphalt should be used?
How much asphalt should be applied for the aggregate? (chips)
What causes roadway streaking in chip seals?
Is it acceptable to apply asphalt full width and chips half width?

Crack Sealing

What is the make-up of a crack sealant.
Can crack sealing precede a seal coat or hot mix overlay? My concern is that the crack seal material could have a negative reaction with the new surface material.

Lift Thickness

Should construction crews be allowed to pave in the rain?
What is the proper thickness of lift that should be used?

Prime Coats

What is a prime coat?
What is the purpose of a prime coat?
What asphalt materials should be used for prime coats?
Is a prime coat necessary?

Tack Coats

Why is a tack coat needed?
What material should be used for a tack coat?
What application rate should be used?
When is a tack coat necessary?

Mix Release Agents

What should be used as a mix release agent for truck beds and rollers?

Placement

Should construction crews be allowed to pave in the rain?
How do I determine how much asphalt is required for a project?
What is the proper paver speed?
Is it ok to cool down the laid mat immediately using water for early traffic?
What is acceptable in terms of standing water or “ponding” on parking lots and other asphalt pavements?

Compaction

Should construction crews be allowed to pave in the rain?
How many rollers are required?
How is air void content controlled?
What is the recommended air void content for compaction of asphalt pavements?
What should compaction requirements be?
What is the best way to check density?

Plant Operations

How can you tell that a mix is properly mixed?

Asphalt Mixtures

What is the proper mix temperature?
What is a minimum temperature for asphalt mixes?
How do I ensure HMA is impervious to water?

Intersections

How do you design a good quality asphalt instersection?

Weather

Should construction crews be allowed to pave in the rain?
Can asphalt be applied in the rain (light drizzle)?

De-icing Chemicals

Do de-icing salts or calcium magnesium acetate (CMA) have a detrimental affect on asphalt?

Troubleshooting

Should construction crews be allowed to pave in the rain?
What causes tire scuffing and what should be done about it?
Will an oil leak from a car hurt an asphalt surface?
Why does the mat have a rich shiny strip down the middle with dull, torn-looking edge strips?
What causes the mat to have rich shiny strips on each side and a dull, torn look in the middle?
Why do potholes occur and what is the best way to fix them?
What might cause surface cracking on newly placed asphalt concrete? The cracking occurred during the breakdown rolling and finish rolling.
How do I ensure HMA is impervious to water?

Special Applications

Does AI have any recommendations of an asphaltic concrete sealer?
Is there a way to color an asphalt pavement other than shades of black and grey?

Railroads

Does AI have any information about asphalt and its use in railroad beds?