Randy Blanton, President of Chesapeake Materials, said, "Quarries can't specialize but Chesapeake does."
On this order, the rock must be 165 pounds (~75 kg) per cubic foot (~0,28m3) and have few seams-"not stuff that's easy to break," said Blanton
They could judge the stone at this quarry by color.
Only the darker grays had a specific gravity high enough to ensure the bridge plan's engineering specifications were met.
Blanton's crews are experts at this.
There will be no rejected shipments.
"This is all our people do, 50 to 55 hours a week, every week," Blanton
"They can tell you whether a rock weighs 4,000 pounds (~1.800 kg) or 5,000 pounds (2.267 kg) from 30 feet (~9,1 m) away.
They know what is good rock or bad rock."
Tools of the trade
said the hammer, the hydraulic breaker, is the most important tool on site.
"It's vital to everything-all we do is determined by the hammer."
All totaled, Chesapeake owns over a dozen hammers.
For nearly 10 years all of their hammers have been Atlas Copco
"We've been approached to try other manufacturers' models, even allowed to try them for free.
Some talk us into it and it usually ends up a disaster," Blanton
said they recently had one scheduled for replacement that was still in operation after 12 years.
For the chisel, he
said, they use the Atlas Copco SilverLine series due to its longevity, performance and price.
explained: "The 3000 is our bread and butter.
When Chesapeake Materials purchased theirs, they were excited by the prospect of a unit that, Blanton said, has "higher impact performance and runs on any excavator in our fleet."
reported, "The general impression from our operators is that it hits harder and gets more work done than a HB 3000.