Patching is an asphalt repair method that prevents further deterioration to the pavement and helps avoid hefty repairs. And contrary to what people might believe, there is more than one way to patch an asphalt pavement.
Various patching techniques can be used to repair potholes, cracks, and other types of damage on different surfaces, including asphalt roads, pavements, parking lots, playgrounds, tennis courts, and more. Also, different patching materials can be used, including hot mix asphalt, proprietary patching mixes with special blends, and asphalt emulsion mixes.
Your paving contractor can better guide you on what asphalt patching technique and material should fit your pavement’s needs, based on the extent of damage it has suffered.
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Below are four patching techniques that are used to repair the damage done to the asphalt pavement.
Throw-and-roll is a temporary patching method that uses liquid asphalt filled into the hole and rolled over. The asphalt can be applied in layers, and it will start to solidify as soon as it reacts with the air. This patching technique is ideal for pavement repair during harsh winters or adverse weather conditions. It is a ‘quick fix’ or emergency patch that is applied in situations when more permanent solutions cannot be achieved.
Spray injection method
In the spray injection method, special truck-mounted equipment is used to blow out water, debris, and loose asphalt from the pothole or crack. Next, aggregate and emulsion are injected to fill the empty space. Since the injection is done at high-pressure, there is no need for compaction. The spray injection asphalt patching technique can be used to treat damage in adverse conditions. On a side note, this is considered a more favorable method than temporary throw-and-roll.
This method is slightly longer-lasting than the previous two patching techniques. It requires proper surface preparation. An air compressor or broom is used to remove all water and debris from the damaged area. Next, a hand tool, pavement saw, or power equipment is used to cut out the damaged area by sawing off the pothole’s deteriorated sides, so only the good pavement is left with smooth edges (no uneven sides that are hard to fill). The hole is cleaned to remove the damaged asphalt, and the prepared hole is then filled with the patching mix. The patch is compacted using a roller or vibrating plate, depending on the blacktop patch‘s size.
This is a permanent repair technique that involves excavating the damaged area by a minimum depth of 4 inches, and extending the sides by at least one foot, so the new asphalt patching material that will be added will get a firmer support. Before the asphalt mix is added, an asphalt tack coat is applied, followed by a backfill to allow proper bonding with the existing surface.
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