15 March 2001
4.8.3. Dilute the material. The material can be used undiluted, but it is usually diluted. Dilution
rates can be as high as 1 part emulsion to 10 parts water, with an average of 1 part emulsion to
4 parts water. Manufacturer's dilution directions for rejuvenators should be followed.
4.8.4. Apply the material. A calibrated asphalt distributor shall be used for material application
(Figure 4.2.). The calibration of the distributor is very important. The spray bar nozzles should be
set at the proper angle and height. Nozzles shall be the proper size and all nozzles should be the
same size for proper material application. Make sure that the nozzles are not plugged before
asphalt material is applied. To avoid slick surfaces, the asphalt material should be applied in
multiple applications over the entire area.
4.8.5. Cure time. The fog seal should be allowed to fully cure before traffic is allowed on the
treated pavement. Cure time is usually 12 to 24 hours.
4.9. Problem Areas (Fog Seals and Rejuvenators). The distributor calibration and spray bar
can cause possible problems during material application; therefore, the distributor should be
calibrated, adjusted, and cleaned. The MAJCOM or TSMCX pavement engineer should be
contacted before a rejuvenator is used. Generally, fog seals are not allowed for airfield
treatments because they tend to reduce skid resistance; however, the MAJCOM or TSMCX
should be contacted. A major problem is over application of material; therefore, proper
application and dilution rates should be followed. Preliminary tests should be conducted to
determine the proper application and dilution rate.