Page 311 - Construction Waterproofing Handbook

EXPANSION JOINTS 6.15

FIGURE 6.12 Sheet expansion joint system. (Courtesy of American Hydrotech, Inc.)

FIGURE 6.13 Remedial sheet expansion-joint detailing.

Bellows systems
Bellows systems are manufactured from vulcanized rubber into preformed joint sections.
They are installed by pressurizing the joint cross section during adhesive curing that promotes
complete bonding to joint sides. A typical installation is shown in Fig. 6.14. These systems are
similar to preformed rubber systems, but use air pressure for installation. Their cross sections
are not stiffly reinforced by ribs manufactured in the material, as are other preformed systems.
Epoxy or polymeric nosing can also be installed, to provide for better wearing at edges.
Bellows are available in sizes up to 3 in but are normally applied in joints 1 in wide. Joint
material depth is approximately twice joint width. These systems function under 50 percent
compression movement and 50 percent expansion movement.
Since bellows systems use preformed material, traffic can be applied immediately
upon adhesive cure. Unlike sheet systems, adhesive is applied to interior sides of a