Many motorists are wondering what TxDOT is doing to SH 73 between Port Arthur and Winnie. So, here's the lowdown on what's taking place on the 19-mile stretch of highway.
While some work is taking place in the westbound section of the highway, the project contractor is working mostly in the eastbound lanes. Over the years, the base material has become unstable causing cracking in the travel lanes. While one probably won't notice it on a casual drive, it's still a problem that has to be dealt with before it becomes a major one.
It's very similar to your home foundation. You probably won't notice too much of a problem if there is a crack in your home slab. But let it go for several years and you will have a major problem on your hands. I've yet to run across anyone who would let their home fall into the ground before making the needed repairs.
The first step is to remove the approximately three inches of existing asphalt to get to the base material, or, the highway's foundation. Workers then replace and work approximately a foot of base material. Afterwards, they lay a layer of asphalt on top of the base followed by a final riding surface of oil and rock known as a "seal coat". Seal coat involves shooting a layer of oil and then placing rock on top of the oil. The rock is rolled into place and the rest is broomed off the highway.
While seal coat is not the ideal riding surface in terms of noise, it is cheaper that regular asphalt and lasts just as long.
The question you may be asking is 'Why put seal coat on perfectly good layer of asphalt?". The reason is protection. Since we are only working certain lanes of the highway and not the entire roadway itself. a seal coat will help keep water from getting into the joints between the good section of highway and the portion being repaired. It's extremely important to keep water out of the base material.
A bad foundation makes for a really bad highway.
Look for more seal coating of some highways. Today's transportation money crunch means we have to stretch our dollars to go further than they have in the past. That means more seal coat on roads with lower traffic volumes.
Depending on the weather, the SH 73 project is expected to be completed by the end of the year.
Happy Driving.
Marc S



