What is asphalt maintenance?Asphalt maintenance consists of protecting asphalt by employing the following methods ( asphalt sealcoating, crack repair, and asphalt repair ) to prevent damage to the existing asphalt.
So why should a property owner have their asphalt sealcoated? From the very first moment that asphalt is installed it starts a deterioration process. The asphalt is diminished when the binder that holds all of the aggregate (stone) together begins to oxidize from sun light, water and external conditions. Through the sealcoating process, the asphaltic binder is now protected from damaging effects from gasoline, oil, and de-icing salts. The asphalt regains that new apperance for a fraction of the original cost.
Asphalt sealcoating is a process in which coal tar emulsion or asphalt emulsion is sprayed or brushed on the asphalt surface. The sealcoat material should be applied in two coats in general areas and three coats in high traffic areas, such as drive lanes.
There is much debate as to what is the best application method for the sealcoat material. There is a predominant mindset amongst “old school” sealcoater’s that brushing the sealcoating material is the only way to go. However, there are some short comings from the brushing technique. By brushing the sealcoat material the natural indentations of the asphalt are filled in and the ashalt loses its traction. Also, contray to popular belief, thicker is not better when applying the sealcoat material. The Sealcoat material should be applied at .17 gal/sq. yd. and should never exceed .51 gal/sq. yd. total.
With the short comings brushing the sealcoat material being stated, there is a better alternative. That alternative is spraying the sealcoat material. This method allows the sealcoat material to be applied evenly without filling the natural grooves of the asphalt. If a contractor that they brush exclusively, take caution in dealing with these companies. Many times these companies have not invested in updated equipment, which will prevent them from completing the bigger sealcoating jobs. Another aspect of sealcoating that is overlooked by customers is the mixture of the sealcoat material itself. The material should be mixed at 25 to 35 gallons of water per 100 gallons of concentrated sealer. Also, the sealcoat material should be enhanced with 2-5 pounds of sand per every gallon of sealer. The sand is used to restore traction to the surface after the asphalt has been treated. When creating work specifications make sure to include the amount of desired sand required per gallon of sealer. The smoother the existing surface or the higher the traffic volume will require higher volumes of sand in the sealcoat material.
In addition to asphalt sealcoating, crack repair is vital to properly caring for asphalt. Due to settling of the ground, poor base design and asphalt oxidation asphalt will crack. When the asphalt cracks it is exposed to water damage. Water penetrates the cracks and gravity pulls it into the sub-base (stones) which deteriorates that supportive structure. This deterioration leads to asphalt depressions, pot holes and further cracking. Also, in the winter when water expands in cracks via the freezing process, the cracks widen over time.
Hot tar is applied to cracks to prevent water penetration. Hot tar is melted to 375 degrees and poured into the cracks. To finish the crack repair process the hot tar is squeeged into the crack to create a 4 inch band. All debris should be removed from the cracks before treatment. Crack repair is a temporary fix and does not replace the need to actually replace the asphalt. However, crack repair is much more cost effective than actual asphalt replacement.
It is said that if 30% or more of asphalt is deteriorated, it is more cost effective to replace it. With that being said, the majority of property owners choose to replace certain sections at a time. One thing to keep in mind is that if an area of asphalt needs replaced because it was sinking, there is definitely a problem with the sub-base and that should be replaced.
If the asphalt needs to be replaced there are two methods for replacement. The conventional method is to saw cut the area and replace the asphalt and seal the seams with hot tar. Another modern method consist of using a Infared Heater to heat the existing asphalt, then additional asphalt is added and the area is compacted. The benefit of using an infared heater is that the fix is a seemless fix that will no longer allow water to penetration. The major fall back with using infared is that if there is an existing sub-base problem, the asphalt will not be properly repaired if it is only re-heated and not actually removed to replace the underlying stone. In the right conditions, infared treatments to asphalt add extra benefits to the property owner because of the final aspect of seamless repair.
The bottom line is that property managers should incorporate an effective asphalt maintenance strategy into their overall preventative maintenance strategy. The benefits of asphalt sealcoating, crack repair, and asphalt replacement will pay dividends in the future through the avoidance of costly new asphalt. One last point, the asphalt maintenance and pavement marking industry has wide fluctuation in quality of contractors, so always do your due diligence in the selection process.
Just Seal It LLC is the recognized Asphalt Sealcoating and Pavement Marking leader in the York, PA. – Harrisburg, PA. – Lancaster, PA. – Baltimore, MD. to Washington D.C. areas. Our great attention to detail combined with our commitment to superior customer service assures that your asphalt will be sealed correctly. For a free quote click here or give us a call @ 717-855-7775.