Serving Chester & Delaware County
PA Paving Pro's:
Asphalt Sealcoating, Driveway Blacktop, & Hot Patching
The most common procedure we preform for asphalt maintenance is patching and we do it by replacing a specific area of pavement. The replaced pavement will usually includes crack and pothole removal. In this process, the asphalt around the damaged area is first removed, including approximately a foot of undamaged asphalt around cracks and holes. The area is prepped by marking a rectangle around the damage. We then break up the cut asphalt using a grinding machine or saw cutter and removed it, making sure to clean any debris. We then, apply tack to the bottom and sides of the hole to help the new asphalt adhere. At this point, the hole is filled with asphalt and a liquid tar to prevent water infiltration and then compressed. Finally, the edges of the filled hole, or patch, are sealed using hot or cold asphalt and aggregate chips and sand.
We usually perform hot patching in commercial parking lots and adjoining roadways (driveways).
2 Types of Sealers are Offered to Maintain Asphalt Installations
The first is an oil based sealer. We recommend this sealer for newly installed asphalt driveways or one that has never been sealed with a water based sealer. The way this sealer works is by combining with the asphalt. Asphalt is made with sand, stone and oil. The oil based sealer is pressured sprayed to penetrate the pores of the asphalt, so this replenishes the oil in the asphalt that the sun and weather dry away. Even after just 1 year, asphalt starts to fade from jet black to gray and white. At this point, the stones in the asphalt mix may start to unbind. The sealer maintains the asphalt as long as possible.
The second type of sealer is an asphalt emulsion sealer. This sealer is normally used for commercial parking lots and for driveways that are in poor condition. This sealer can help postpone the replacement of a residential driveway and we use it at times when a homeowner can't afford a completely new driveway. So it can serve a a short term solution for the need for new pavement.
Protect Your Investment...
The primary cause of pavement failure is the penetration of water into the asphalt base. Oxidation of the pavement surface from sun, water and temperature changes, begins this process which causes the asphalt to dry and become brittle. This eventually leads to the erosion of the top layer of the asphalt mix and the appearance of larger stones and small cracks on the surface. If left untreated, these cracks grow over time and eventually allow water to penetrate to the base of the pavement. When water enters this base, the base material moves and settles leading to further cracking and an "alligator appearance." When the pavement reaches this stage the only option is removal and replacement of the old asphalt, which costs the most.