UFC 3-270-03
15 March 2001
a mechanical agitator to prevent localized overheating at the walls. Calibrated thermometers
must be easily visible to allow constant monitoring of the sealant temperature to prevent the
possibility of overheating. The sealant must be circulated through the delivery hose and back to
the heating chamber when not being applied.
9.10.2. Liquid. The equipment employed to apply sealants that are liquids at room temperature
does not maintain the sealant reservoir at the application temperature. The sealant is heated just
prior to application by pumping through transfer lines immersed in an oil bath.
9.11. Cold-Applied Sealant Equipment. The necessary equipment for application of
cold-applied sealants depends on whether the sealant is a single-component or a two-component
mix and whether the material is hand-mixed or machine-mixed. Two-component machine mixers
consist of an extrusion pump, air compressor, and the associated hoses to dispense the
components through separate nozzles and mixed in a 50:50 ratio with less than 5 percent error
just prior to discharge from the nozzle. Hand-mixing equipment for two-component sealants is
generally a slow-speed electric drill with a paddle mixer or an air-powered mixer. Single-
component sealants should be mixed to overcome any segregation before they are applied to the
pavement. Small hand-held caulking guns can also be employed for small jobs.
38
Previous Page
