This is a video of our asphalt crew performing a full depth replacement of Tapawingo Rd. in the Town of Vienna. Full depth replacement is a process where we remove the entire layer of existing asphalt down to the sub base which is the foundation for roadways. Using a Wirtgen 1200 milling machine, we grind the existing asphalt to a predetermined depth and empty the ground up pieces of asphalt (millings) into the bed of a tandem Mack dump truck. The millings are then taken to an asphalt plant where they are recycled, and introduced into a new mix of asphalt. After the milling is complete, the existing sub base is re-compacted and then we will pave the new road way.
This is a video of our asphalt crew paving a parking lot for a Home Owners Association in McLean, VA. Using a Lee Boy asphalt paver and a tandem Mack truck, we dump the new asphalt surface course into the hopper of the paver, and spread the new asphalt on the existing parking lot. The asphalt paver allows us to lay the asphalt in a uniform manner at a predetermined depth; in this case we removed the surface layer of existing deteriorated asphalt to a depth of up to two inches, and replaced it with a new layer of 9.5 mm asphalt surface course. After the asphalt is laid we use an Ingersoll Rand roller to compact the new asphalt and remove any voids of air making the roadway smooth for future traffic.
This video is of our asphalt crew doing night work at the office buildings at Reagan National Airport. Most of the work at Reagan National has to be night work due to the high volume of traffic coming in and out of the airport during the daytime hours. In this process we use a Wirtgen 1200 milling machine to grind the existing layer of deteriorated asphalt surface course to a predetermined depth; in this case it is a removal and replacement of the top two inches of asphalt. Once we remove the asphalt, we will pave the parking lot with a new two inch layer of 9.5 mm asphalt surface course. Once we spread the new layer of asphalt at a uniform layer of two inches, we compact the asphalt with a Ingersoll Rand roller to provide a smooth surface for future traffic.
This is a video of our concrete crew at George Mason University. Here we removed various sections of the existing deteriorated sidewalk throughout the Presidents Park section of the student housing. Once we have removed the old concrete, we compact the existing sub base to ensure a strong foundation for the new concrete. We then form the perimeter of the area with wood/metal forms, and install steel reinforcement using ½ inch rebar. The installation of steel reinforcement will provide the new concrete with a “skeleton” so that if the future concrete cracks or fractures, it will have a means of maintaining its existing integrity and hold together properly. As this area was not accessible to heavy equipment, we used power buggies to transport the concrete from the concrete truck to the site where the new sidewalk is to be installed. We then pour the new 3500 psi concrete, and finish it using floats and edging tools, and then provide a broom finish to deter the new concrete from being slippery when wet.
This video is of our concrete crew at The Patriot Center at George Mason University. Here we removed various walkways leading up to the entrances to the arena. In this process we had to excavate the existing deteriorated concrete. The concrete was excavated to full depth, and we then compacted the existing sub base. Once the sub base was compacted, we installed steel reinforcement using 6″x6″ welded wire mesh. As this was an area that was not accessible to heavy equipment, we had to transfer the new 3500 psi concrete using power buggies. Once the new concrete is dumped from the buggy, we spread it using a metal leveler and then finish the concrete using floats, edging tools, and provide a broom finish to deter the new concrete from being slippery when wet. As concrete expands and contracts throughout the winter and summer months, this can cause existing concrete wo move slightly over time, which can lead to damaging the edges of new and existing concrete. To eliminate this, we use expansion joints to provide a buffer between the two pieces of sidewalk so that they have room to let mother nature work.