Rehabilitation
of Concrete Pavements
with Polyguard NW-75 Prior to Asphalt Overlay
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Rehabilitation
of Concrete Pavements POLYGUARD HOME | HIGHWAY HOME | DATA SHEETS | GUIDE SPECS | MSDS's | CONTACT US |
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There
is an alternative to the costly practice of removal and replacement
of failed pavement sections prior to an asphalt overlay.
On this project, the facility owner, who had planned removal and replacement of pavement sections, heard that he could save a significant amount on the project cost by applying Polyguard NW 75 Underseal to all joints and cracks. Not only was the project cost reduced, but the entire project was waterproofed. Water now cannot get through the joints and cracks of the concrete to the subbase. |
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| Procedure for application of Polyguard NW-75 Underseal to concrete pavement | ||||
1. |
Clean
the old pavement On this project, debris was removed from all cracks and joints, and the entire pavement was blown clean |
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2. |
Fill
holes with asphalt patching material The pavement surface should be relatively smooth in preparation for application of the NW 75 Underseal and asphalt overlay |
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3. |
Equipment
and supplies needed Brooms for final cleaning Utility knives to cut underseal to size Liquid adhesive primer (not always needed - see 4) with sprayer Rubber tired roller (tractor or truce) |
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4. |
Spray
liquid adhesive primer (if required) on joints and cracks in area where
Polyguard is to be applied. Primer is usually not necessary if temperature is >70 º. F. Apply a small test piece and walk on it; if it pulls off easily, primer is needed. If temperature is between 40 - 70 º F, primer is recommended. Primer should average 400 square feet per gallon when sprayed. |
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5. |
Roll
out a roll of NW 75 along the joint Once the roll is rolled out, center the NW 75 underseal across the joint. |
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6. |
Peel
the first 6 - 12 inches of silicone coated release liner away from
the adhesive face, and apply it to the pavement at the beginning of
the joint In this picture, Chris and Tony have peeled the release liner away and are ready to apply it to the pavement |
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7. |
With
one crew member standing on the adhered portion, the other crew member
should walk away down the length of the joint, pulling the release
liner away as he goes Crew should pause every 20 - 25 feet to make sure that the NW 75 underseal is still centered on the joint. |
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| Note: for high volume projects, such as this one on Interstate 20 near Tyler, TX, an installation cart is available |  |
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8. |
Cracks
in the slab should also be treated if they could allow penetration
of water into the subbase Hairline cracks do not need to be treated. If multiple cracks exist, Polyguard NW 75 is available in wider widths (24" and 48") for easy area coverage. |
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9. |
After
application, all NW 75 underseal should be rolled. A rubber tired roller
is best. The objective of this is to create 100% surface contact between the adhesive and the pavement. |
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10. |
Congratulations. You have saved money, waterproofed the pavement, and given the new asphalt overlay increased resistance to cracking. |  |
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SEE
LINKS BELOW FOR ADDITIONAL DETAILS |
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| Detailed instructions and guide specs (665 NW-75 Data Sheet) | ||||
| How Polyguard underseals protect pavements | ||||
| Highway DOT research…. | ||||
| List of State DOTs……. | ||||
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