Taking the next step

Concrete products are manufactured to last almost forever. Why, then, discard the sturdy material just because the useful life of a concrete building or highway has ended? For Terry McAfee and his son David, landfilling old concrete didn’t make sense; today they are on a mission to recycle concrete.

The McAfees own and operate Demotion Technologies Specialized Services Inc. (DT Technologies) from the company’s Tulsa, Oklahoma, headquarters, and it is from here that they manage demolition projects across the lower midwestern United States. Five years ago, while tearing down a concrete structure, the McAfees decided that the project created an unusually large pile of debris and the two were uncomfortable with hauling it all away to a landfill.

“We realized the sheer volume of concrete debris we created was going to be wasted rather than recycled. That was the cornerstone of our decision to start the crushing business,” says Terry McAfee. The result is an affiliated company called ReRock Materials Inc., which creates recycled concrete and aggregate products.
 

Committed to recycling

ReRock is a business and is operated as one, and the McAfees are committed to recycling as an environmental best practice, even though they live in a region where natural aggregate is in ample supply and landfill fees are low.

“We want to recycle a large amount of concrete per project,” David McAfee says. “But we are not doing this because, hey, this is a windfall. We are doing it as a commitment to the recycling industry.”

As experienced as David McAfee was in construction and demolition management in 2008, he was a novice recycler. He had seen a rock crusher at the exhibition ConExpo/Con-Agg in Las Vegas, and went shopping for more information. After visiting recycling operations and looking over different brands of crushers, he purchased a mobile jaw crusher and went to work.

Almost as important was his meeting with Brian Costello, cofounder and sales director of Crushing Tigers, which supplies mobile crusher and screen machines and spare parts in the Oklahoma and Arkansas markets. Costello sold McAfee an Extec S-3 screen, currently known as the Sandvik QA140, a tracked unit with a 10-foot by 5-foot screening area and double-deck screen, which McAfee says exceeded his expectations. After the sale, McAfee began to look to Costello for other industry insight.
 

Doubling up

He looked to the right person. When Costello and managing director Pat Doab started Crushing Tigers, they did so with the intention of guiding customers toward even more efficient crushing and screening operations. In looking critically at DT, the men soon concluded that more efficiency for DT operations would require bringing in a secondary crusher.

However, David McAfee was not in the market for another crusher. To convince the recycler, the team demonstrated a Sandvik QI240 PriSec mobile impact crusher. The demonstration and subsequent analysis showed that while the overhead of a second machine had been added to the crushing process, the cost per ton of crushed concrete decreased. Costello and Doab repeatedly crunched the numbers with David McAfee until there was no question in his mind.

As a result of the additional machine, ReRock Materials had increased production out of proportion to the increase in production cost. “Before adding the Sandvik crusher, we were normally producing 30 to 50 tons of salable product an hour,” David McAfee says. “Now, if we are not doing 200 tons an hour, there is something wrong.”

That massive increase in production makes all the numbers look good, he says. The addition of the Sandvik QI240 reduced the cost per ton to a third of its original value. Furthermore, with the QI240’s four-bar rotor turning irregular chunks into uniform nuggets, reliance on the original jaw crusher was lessened, extending its working life.

At DT Technologies, the QI240 is used primarily, but not exclusively, as a secondary crusher. The McAfees are able to use the machine in both capacities as the QI240 is the only impact crusher on the market capable of operating in either a primary or secondary position. This unmatched versatility comes from the patented design of its impactor box.

Besides operating efficiency, McAfee says what sold him on the QI240 was its portability. The 43-ton crusher moves on 20-inch-wide tracks and is transported by trailer. The compact machine is just 8 feet wide and 46 feet long—an easy permit to get for companies wanting to operate the crusher at more than one location at the production rate this machine can achieve. DT Technologies is one such company.

“My bigger motivation in getting the QI240, aside from cost savings, was to have a machine I could throw on a trailer, run 500 tons of material in a day, and then move it back off site,” he says. “Its mobility is key and its quick setup.”

These two attributes of the QI240—the efficiency of the machine’s crushing process and its portability—have ushered in additional business at DT Technologies. First, more rock is being processed by the company for selling and stockpiling against future sales. Second, when work is slow at a demolition site, the QI240 is trailered elsewhere for custom crushing.

“I’m glad we started doing business with Crushing Tigers and Sandvik,” McAfee says, adding, “We are better than we were before. Developing the relationship, coupled with the sharing of expert advice, has certainly improved our business.”

Such trusting relationships are precisely what Costello and Doab want to forge with their customers, according to Doab, saying, “the key is working together as a partnership. The relationship is important for sustainability, and the trust creates opportunities for everyone.”

Costello adds that selling and servicing good machinery is gratifying, but becoming trusted partners with customers tops all. “I respect what machines can do, but it is working with people that makes my day,” he says.

This article was submitted by Sandvik Construction, based in Sweden. Giles Lambertson is a freelance writer and former carpenter who has been writing about the construction industry for nearly two decades.