Parking Lot Asphalt Crack Sealing

 Parking Lot Asphalt Crack Sealing

 

CRACKS HAPPEN

Where there is a parking lot, most likely there is asphalt paving and cracks are inevitable. They result from various factors including freeze / thaw cycles, differential settlement, etc. Let them get away from you and they will cause more and more damage Reason pro Crack to the point that finally your parking lot cannot be repaired; it must be replaced. Stay ahead of them and you can help to extend the life of your parking lot.

Some cracks are manageable and others are not. The ones that are not are those that are caused by structural fatigue in the pavement – fatigue or “alligator” cracking. And, the other manageable cracks – if not managed – will likely cause accelerated structural fatigue. So, it makes good sense to properly maintain / seal the ones that you can. Otherwise, due to normal expansion and contraction of the parking lot, cracks will be created, water will seep

in, water will turn to ice, and the ice will expand to 9% more than the volume of what it was in its liquid state, creating an even bigger opening for more water infiltration.

And all that water, combined with load stress, chemicals, and oxidation from the sun’s ultraviolet rays further accelerate the path to alligator cracking – a sign of a parking lot’s structural failure.

KEEP THEM SEALED

Obviously then, a key component to a good parking lot maintenance program is keeping water out of the base layers of asphalt where it is likely to cause the most damage. An effective crack sealing procedure is the key to keeping the water out and Parking Lot Maintenance, LLC (PLM) offers that well-tested effective procedure.

Initial Assessment

TYPES OF CRACKS AND OPTIONS

Since crack sealing is a preventative maintenance measure, the type of cracks is the main determining factor as to how, or even if, a crack or cracks can, or should, be properly sealed. Of course, most should be sealed, but again, as previously mentioned, if the cracks are due to structural failure, another repair / replacement method would prove most beneficial.

A lot of the crack assessment has to do with depth, width, pattern, frequency, etc. Those factors will help the PLM project manager determine the most appropriate material and methods to utilize.

One of the most effective methods, and therefore most frequently used, is Hot Rubberized Cracksealing. Compared to a cold applied sealer that typically lasts only 1-2 years, a hot rubberized cracksealer has a life cycle of 3-5 years. PLM’s proven process of applying hot rubberized cracksealer is described below.

The Process

Step 1: Cleaning and Drying

To help ensure the sealant properly adheres to the surface, cracks must be clean and dry – free of dirt, dust, asphalt fragments, oils, and moisture. That is achieved by either routing and / or hot-air-lancing.

In most cases, PLM recommends routing – or cutting through – the crack, and most beneficially to a depth equal to the width of the crack. A 1:1 width to depth ratio is optimum prior to sealing. Routing helps to provide a clean and uniform surface for the sealant to adhere. In fact, studies have shown that routing combined with using a hot air lance is the most beneficial method for cleaning and drying a crack prior to sealing.

However, at minimum and actually at the best cost / benefit ratio, a hot air lance alone is utilized. With heat and compressed air, a hot air lance will deliver a jet-streamed high pressure blast of hot air that will both clean and dry the crack and nearly with the same effectiveness as if combined with routing. Heat combined with high pressure air are obviously the key ingredients.