Equipment World

September 2017

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September 2017 | EquipmentWorld.com 50 they'll come in with a cutter, cut in three slots and put three bars on each wheel path so you'll have a total of six bars per lane," Goss says. He adds that this technique provides long-term rideability. • Diamond grinding and groov- ing: This provides a smooth, rideable surface, and with certain cutter profiles, it can provide a low-noise roadway. "That's a two-step process where you have a diamond grinding up at the top and then come back and do a grooving where the blades are spaced out about three-quarters of an inch," Gross says. • Partial-depth repairs: Using concrete milling heads with dif- ferent patterns is becoming more popular in Iowa and Minnesota, Gross says, with Minnesota lead- ing the way. "They've been very successful with those, and we'd like to say, on the average, a par- tial-depth repair will give you at least 10 to 20 years of life if the pavement is the right candidate." Minnesota has several examples where such repairs have lasted 30 years. Gross says this tech- nique aims to rehabilitate where there is joint distress limited to the upper half or upper third of the concrete. "The overall goal is to get that loose concrete off the top, mill it out, clean out the patch, prep it and put in the patch mix," he says. "There are good mixes out there, and we're getting good performance." • Slab stabilization: This involves filling voids under the pavement with an injectable cement grout or polyurethane. This is a rela- tively non-destructive technique, Gross explains. "If you're using a cement grout, you're going to end up with a 1- to 2-inch hole in a series on a panel. If you're using a polyurethane, you only need about a half-inch hole." "What we also want to identify with pavement management and the pavement preservation tech- niques is that when we spend the money, we get that jump in qual- ity," Gross says. "If you pick the right techniques at the right time, you can bring that roadway up to an excellent condition." For example, partial-depth repair and diamond grinding can improve a concrete road's quality and ex- tend its life many years at minimal cost. But if used during the wrong conditions, problems can occur. "If you let a road go too far, and it's not the right tool or it's too far down the curve to provide a pres- ervation technique, what happens is that technique doesn't last as long and you're spending more money; you're investing more money over the years," Gross adds. "So it's im- portant to pick the correct tool for the correct roadway." road technology | continued A portion of concrete pavement that has been milled in preparation for partial-depth repair. A close-up of a milling head used in partial-depth repair. (Concrete Pavement Association of Minnesota) (Concrete Pavement Association of Minnesota)

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