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Technical Tip
Sealing the Deal
A guide to sealing airport pavement joints
Joint sealants are used in concrete airport pavements to keep out incompressible
materials and to minimize water infiltration, reducing the risk of foreign object
damage (FOD). To perform well, sealant materials must withstand repeated extension
and compression as the pavement slabs expand and contract with temperature and
moisture changes. The size and shape of the sealant cross-section affects the sealant
material performance. Details 1 through 4 show common sealant configurations for
airfield pavements.
For hot-poured sealants, the shape factor (W/D) typically equals 1. For silicone and
two-component cold-poured sealants, it is typically 2. For preformed compression
seals, the W is normally sized for the slab length and climatic conditions & region of
the pavement.
For poured joint sealants, the lower the depth-to-width ratio or shape factor, the lower
the strain on the sealant during joint movement.
The required shape factor will depend on the properties of the sealant and the amount
of joint movement. Joint movement is related to the joint spacing and to the
maximum seasonal temperature change in the slab.
For preformed, compression-type seals, manufacturers provide recommendations for
seal widths depending on the slab size and climatic conditions.
For additional information, see ACPA publication "Airfield Joints, Jointing Arrangements
and Steel" (TB017P). To order ACPA publications, go to the ACPA website,
www.pavement.com; call toll-free 1-800-868-6733; or fax requests to 847-966-9666.
Contact Jim Lafrenz at 847-966-2272 for more information or if you have any
questions about this article. Would you like to submit a technical question? Send an email
to ACPA or call Bill Davenport or James Martinez at 847-966-2272.
ACPA Literature Showcase
Concrete Pavement Repair Manual
This pocket-sized field manual (JP002P) is an excellent resource for inspectors,
engineers, contractor crews, and anyone involved with concrete pavement repair
on both airfields and roadways.
The guidelines cover concrete pavement repair and restoration techniques
including full and partial-depth patches, diamond grinding, and load transfer
restoration. Numerous photos and diagrams depict the repair scenarios. This
manual is an annotated reprint of the U.S. Department of Defense Tri-Services
military manual UFC 3-270-04.
The cost of this publication is $24.00. To order JP002P, access
http://www.pavement.com/ecommerce/main.html; call toll-free 1-800-868-6733; or
fax requests to 847-966-9666.
Free Registration for World of Concrete Through ACPA
ACPA encourages early registration for the World of Concrete (February 16-20)
through ACPA's website, www.pavement.com, and save the $40 registration fee.
This annual trade show for the concrete industry will be held at the Orange County
Convention Center, 9800 International Drive, Orlando, Fla.
The world's largest annual trade show for commercial construction is the ultimate
showcase for concrete equipment, products, and technology. In February, these three
aspects combine to deliver personal interaction with manufacturers, hands-on
experience with the latest products and in-depth training from industry experts. More
than 50 seminars and demonstrations will feature technical issues including ACPA's
"Concrete Pavement Mega-Demo," a demonstration of an unbonded overlay.
Register now by clicking on the World of Concrete banner below, or click on the World
of Concrete banner on ACPA's website, www.pavement.com, and receive the following
... compliments of ACPA.
• Free registration for exhibits - a $40 value
• Reduced seminar fees - $10 savings per seminar
Click on the logo to register online with the ACPA code.
Click here to print a registration form to fax with the ACPA code.
Don't miss this opportunity to register for free ... Even if you are not sure which seminars you
will be attending, you can always add them to your registration at a later date. Be sure your
registration form contains the ACPA registration code: A14.
Concrete Pavement News Digest
ACPA Announces Airport Pavement Design Seminar ... ACPA has scheduled the
2004 Airport Pavement Design Seminar to be held February 9 - 11 ... The 2003 Fall
Airport Design Seminar (October 7 - 9) sold out within weeks of its announcement ...
ACPA urges those interested to sign up as soon as possible ... Scheduled at ACPA
offices in Chicago/Skokie, the three-day seminar is geared toward entry-level and
project engineers.
It will consist of: A comparative analysis of the Federal Aviation Administration,
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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