Chipseals, also known as tar and chip, chip seal or seal coating, are constructed by evenly distributing a thin base of hot bitumen or asphalt onto an existing pavement and then embedding finely graded aggregate into it. The aggregate is evenly distributed over the seal spray, then rolled into a smooth pavement surface. On average the chips and asphalt are no thicker than 1/4 inch.
Aside from being a thin layer, chipseal has othe drawbacks:1
The challenge with chip seal starts with the foundation or base layer. The Asphalt Institute reports:2
"Chip seals are not suited for all pavements; the existing structure should be sound with only minor surface defects. They are not appropriate for rutted, potholed, or severely distressed surfaces. Once structural damage has occurred, preventive maintenance treatments are no longer applicable and more involved corrective strategies are required."
But all too often cost savings and hasty application practices cause installers to spread asphalt over the defects and loose agregate hoping to bind or hide the defect before putting down the chips. Those chips then get shaken loose as vehicle traffic moves, damaging windshields and leading to a loss of traction, leading to property damage, injury or even loss of life.
Adding fog-seal on top of chip seal further reduces traction ratings by 30% and over time up to 50%.5
Petraviam is up to 10-times stronger than chip seal when applied conventionally, saturating into the sub-base material. When applied topically, it outperforms chip seal by penetrating the sub-base and creating a bond the sub-base that is 3/4 to 1 and 1/2 deep. When infused into a 3 or 4-inch lift, Petraviam creates a rock hard paved surface through out.3
Petraviam is organic and does not contain the Volatile Organic Compounds and carcinogens found in the asphalt used in chip seal.4
Applying Petraviam topically on properly prepared roads is cost effective compared to chip seal. Pave naturally, chose Petraviam.
1 Wikipedia, March 1, 2018, https://en.wikipedia.org/wiki/Chipseal
2 Asphalt Magazine, February 28, 2018, http://asphaltmagazine.com/improving-chip-seal-performance/
3 Petraviam, February 28, 2018, https://www.petraviam.com/solutions.html
4 Petraviam, February 28, 2018, https://www.petraviam.com/case-studies/asphalt-or-petraviam-for-your-county-road
5 Purdue University, EVALUATION OF PAVEMENT SURFACE FRICTION TREATMENTS, December 2011, https://docs.lib.purdue.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=2992&context=jtrp
Petraviam stands up to a pounding, wet or dry, exceeding asphalt specifications.
For research purposes, we continue to test Petraviam for durability and performance. During rain or shine, Petraviam maintains a hard and impervious surface.
Following a Brinell hardness methodology, we measured wet compacted road base, dry compacted road base and a county road against Petraviam roads for hardness. Wet Petraviam roads were 300 percent harder than wet road base that had been compacted. Over time, as the solution oxidizes, the Petraviam paved surface continues to get harder.
What does it mean for counties and municipalities? Safer roads, happier citizens, reduced road and bridge expenditures. The county road below was paved 2-months ago with an asphalt seal coat, when it rained it turned to mud with a relative hardness of 0.114 compared to the adjacent Petraviam paved ranch road with a hardness of 3.39. The photo below tells the tale; ruts and mud that will turn to dust and erosion over time.
What does it mean for facilities operators and logistics companies? Petraviam stands up to 80,000 pound trucks running all day, every day, rain or shine.
Watching a road runner cross this section of road recently sprayed with asphalt and the question comes; how is this different from the ecological disaster of an oil spill? Granted asphalt is refined crude oil but what can be learned when you look at the Material Safety Data Sheet?
Examining the Material Safety Data Sheets, asphalt’s MSDS is chock full of serious notations and warnings. Compare this to Petraviam sheet and it’s obvious just how different Petraviam is.
When environmental safety is a key decision criteria, Petraviam emerges as the clear winner.
And the road didn’t hold together very well either. In the photo below you can see the aggregate breaking loose at the surface only three days after the asphalt was sprayed. What does that mean? This road treatment will need to be repeated, putting more toxins into the environment.
Over a month ago, Petraviam was applied to this ranch road leaving the surface smooth and dust free. Watch the video as the driver takes you on 3-minute journey out the ranch road and down the county road. The ranch road is smooth at speeds of 45-miles per hour. The untreated county road is dusty, rough and at 40-miles per hour, uncomfortable to drive on.
States and municipalities are moving to unpaved roads to contain costs and improve the environment. As reported in Wired Magazine1, 27 states have made the move.
By un-paving instead of repaving, the city of Montpelier, Vermont, saved about $120,000—a big chunk for a city whose annual budget for street building and repairs was $1.3 million.
Plus, using materials like cement are expensive and environmentally unfriendly, the cement industry is a huge producer of the green house gas, carbon dioxide — responsible for about 5 percent of all global emissions. 2
Asphalt is harmful as well as it contains Volatile Organic Compounds such as benzene, and other known carcinogens. Coal tar, used in many surfacing applications is actually even more hazardous to the environment and ultimately our health.