Enzyme can make dirt roads durable, man says
By Kristen Wyatt | Associated
Saturday, July 30, 2005
ATLANTA - Thomas Settles grew up on a dirt road in Edgefield, S.C., a
road so crummy it washed out completely after a heavy rain and he sometimes
couldn't get to school. Summers were spent choking at the road's dust.
Mr. Settles, 53, owns a paving company in Atlanta and is on a mission
to save poor Southerners from the indignities he grew up with. He's out
to make dirt roads as good as paved ones.
"Look at this," he says, holding up a plastic jug of molasses-looking
brown stuff. "This is all it takes."
The brown stuff is an enzyme called PZ-22X that can toughen dirt roads
and help them stand up better to rain. He says it will be a blessing for
rural communities that can't afford to pave all their roads.
Mr. Settles didn't invent the enzyme, but he bought the rights to it,
christened it Pave-Zyme and is getting permission across the Southeast
to test it on dirt roads.
Mixed with water and sprayed on dirt, the Pave-Zyme acts as a sealing
agent, making the dirt more impermeable to water.
"It seals, it acts as a dust suppressor and it compresses,"
says Mr. Settles, whose claims about the enzyme would seem ridiculous
if he didn't appear to believe them.
He says Pave-Zyme can improve health (by reducing dust in the air around
dirt roads), narrow the education achievement gap between rich and poor
(because kids living off dirt roads wouldn't have trouble getting to school)
and otherwise revolutionize life in rural America.
And he's spreading the dream.
Atlanta - which still has some dirt and gravel roads - will test Pave-Zyme
on three roads starting in August. The enzyme recently was put down on
a dirt road in Aberdeen, Miss., and also is being tested in Macon County,
Mr. Settles says Pave-Zyme can harden a dirt road for $60,000 to $100,000
a mile - versus $180,000 and up to put down a mile of asphalt.
He isn't charging for the tests, where Pave-Zyme is mixed with water and
sprayed on dirt or used under asphalt to make regular roads hold up longer.
Mr. Settles thinks that once local officials see how well it works, they'll
come back to buy.
"It was a win-win," said Atlanta City Councilman Ceasar Mitchell,
who sponsored the idea of allowing Mr. Settles' company to try Pave-Zyme
for free in Atlanta. Included in the city's test is a dirt road where
a girl died three years ago when her bike hit a pothole. The city still
hasn't found money to pave that road.
"It's just unsightly," said Mr. Mitchell, adding that dirt roads
often attract illegal garbage dumping.
In other communities, dirt roads can be dangerous. In Brantley County
in southeast Georgia, which has 700 miles of dirt roads, emergency workers
have reported getting stuck on their way to calls.
"It's always a challenge. In the winter when it's wet, you can get
stuck. In the summer, it's all dust and sand, and you can get stuck in
that. It happens quite frequently," said Tim Crews, the director
of the county's Emergency Medical Service.
Mr. Settles says Pave-Zyme makes a road good for five to seven years,
shorter than asphalt paving but still an improvement from plain dirt,
although road officials were skeptical.
Experts warn Pave-Zyme probably isn't a low-cost cure-all. Other hardeners
have been tried before, and products such as calcium chloride already
are regularly added to dirt roads to help them last and reduce dust.
Nothing, so far, has completely solved the problem, said Dennis Rice,
who puts together a quarterly newsletter on road technology for the Georgia
Department of Transportation.
"If you want a road to be like it's paved, you've got to pave it,"
Mr. Rice said.
Dirt-road improvements are especially troublesome in the South, where
heavy rains and hot summers work against road hardeners, he said.
"You really have to have something you can hold together real tight,"
such as gravel used in pavement, he said.
Mr. Rice and other transportation officials aren't completely dismissing
Pave-Zyme. The Georgia DOT is monitoring the Atlanta test and might consider
endorsing it for local use if Pave-Zyme performs well. (The department
doesn't directly maintain any dirt roads; all the ones in Georgia are
maintained by counties and cities.)
Georgene Geary, a materials and research engineer for the Georgia DOT,
said she's curious to see whether Pave-Zyme does the job.
"We've had other products come through here and they weren't successful.
They just didn't hold up," she said.
Mr. Settles is convinced he's about to change some minds.
"In some communities, they just can't afford to pave all their roads,"
he said. "This is something that will consistently make the roads
better at a price they can afford."
It's wait-and-see for officials.
"There's a lot of snake oil out there that doesn't work, but the
only way to know for sure is to put it down and try it out," Mr.
From the Sunday, July 31, 2005 printed edition of the Augusta Chronicle.