Anecdota

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How to Treat and Repair Pavement Cracks


Crack sealing is the root of all evil as
far as pavement maintenance goes. Once the crack opens and water
gets down into the base of the pavement, that’s when problems start to appear. I
always try to encourage an agency, that if they have money to spend on any one type of maintenance to make it crack sealing. That’s the one thing that they get the
most bang for their buck. There are different types of cracks. There’s a transverse cracks, which run from the side of the payment towards the middle
or all the way across. There’s longitudinal cracks, which run
the length of the pavement. Either next to the centerline or about the middle of
the lane. Reflective cracking happens when an overlay has been put down and
the cracks below it have not been treated, and those cracks reflect up
through the new pavement and reform. Alligatored cracking develops because
the crack sealing process wasn’t done early in the pavements life. Once the pavement gets to this point, there’s really nothing you can do, the pavement is
too far gone. You can crack seal the cracks and buy some time into it. But
eventually, you have to tear all that out and start fresh. When is the best time to
crack seal? As far as the sealant manufacturers go, that the best time to crack seal is either in the spring or the fall. The reason being is pavements
move as we all know they expand and contract and they’re kind of midway
between their minimum and maximum movement. So you actually get a better
shot of effectively sealing it then. Crack preparation, there’s really a
couple of different techniques to go by. Routing, saw cutting, where you’re
actually creating a reservoir for the sealant to have room to adhere to the
sidewalls of the crack. Routing and saw cutting can add up to 40 percent to the life of the seal job. There’s blow and go where you just basically blow out that
debris and the dirt and just apply the sealant. The application methods of an
oil-jacketed machine usually includes a hose and a wand, which could be either non-heated or heated. The direct fire unit you usually
end up using, a what we call a pour pod or a bander. Where you pour the
material into it and apply it in the crack that way. When applying the sealant
one of the critical things to watch out for is, putting too much sealant on the
surface or leaving too much on the surface. If you’re doing an over band
situation, you really need to either have a sealant disc on your equipment or have
somebody follow with a squeegee. To make sure that sealant is nice and tight against the pavement. Main reason for this is, if you ever overlay that area if there’s a bunch of excess sealant on the surface. When that hot mix hits that
sealant, it live-ins up remelts it. When the roller comes along and hits that
spot, it actually slips because it becomes slick due to the melted sealant
underneath it. Which actually creates little bump in the pavement. All materials are equipment discussed are
readily available at any of our GemSeal One-Stop-Shop locations.

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