15 March 2001
reduce operator hazard may include protective clothing as well as eye and ear protection. The
operator must take special precaution not to overheat the pavement which may cause cracks and
chalking of the concrete surface. Direct flame devices must not be used.
9.7. Waterblasting Equipment. Waterblasting is an excellent technique for cleaning joint faces.
This technique is sometimes employed as an alternative to sandblasting due to local air
regulations or where the sand and debris might create additional problems. Waterblasting
equipment should consist of a trailer-mounted water tank, pumps, high-pressure hoses, an
auxiliary water supply, a wand with a safety cutoff if the operator should lose control, and a proper
size nozzle for the crack width (Figure 9.4.). After waterblasting is completed, the entire joint
must be dried.
9.8. Power Broom. A vacuum-type power broom should be present to remove debris from the
pavement surface and reduce the potential for FOD (Figure 9.5.).
9.9. Backer Rod Installation Equipment. Backer rod may be placed by hand and many
contractors have constructed their own hand-held equipment for this operation. However, there
are manufacturers of installation equipment. These devices place the rod at a consistent depth
without undue stretching or tearing of the backer materials (Figure 9.6.).
9.10. Hot-Applied Sealant Equipment. There are two basic types of hot-applied sealant
equipment: one for heating sealants that are solids or liquids at room temperature and one for
sealants that are liquids only. The former devices are much more prevalent. Both types must be
capable of holding a sufficient amount of sealant and be able to heat the material to the proper
controlled application temperature (usually between 325 degrees Fahrenheit (163 degrees
Celsius) and 480 degrees Fahrenheit (249 degrees Celsius)) without overheating.
9.10.1. Solid. The equipment necessary for application of room-temperature solid sealants must
consist of a double-wall-type kettle that is heated by a fluid between the walls of the chamber and