Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/873881
September 2017 | EquipmentWorld.com 48 they're hiring it out for contractors to do crack sealing or a preserva- tion project," Gross says. "You need to ask yourself what is most feasible for your agency and how do these strategies impact the overall perfor- mance." 5. What's the long-term funding solution? To answer this question, Gross recommends agencies use a software program that processes road condition data, such as crack measurements. Programs such as MicroPAVER or dTIMS provide a variety of management tools to help establish budgets and help deter- mine how an overall road network will perform under different fund- ing levels. Software also provides quantitative data and assigns a road's priority level in an agency's capital improvement plan or man- agement plan. CPR techniques Concrete preservation methods need to be thought of as a toolbox of techniques, Gross says. Some- times there could be two or three different tools that an agency will want to use, but care has to be tak- en in going through what he refers to as a "hierarchy of techniques." "For example, if you have a road- way that needs concrete full-depth patching or partial patching or if you have faulted joints, you would do the full-depth repairs before you do any dowel bar retrofit," Gross says. "Then you would hopefully do some diamond grinding, if you have funds that would allow that. The last technique would be to reseal those cracks, because with both concrete and asphalt roads, we want to keep that water out, especially in the upper Midwest where we want to eliminate or minimize freeze-thaw distress." The more common CPR methods include full-depth repair, partial- depth repair, diamond grinding and grooving, joint and crack reseal- ing, slab stabilization and dowel bar retrofitting. Each one of these techniques, described below, has its own timeline and limitations for usage, depending on the pavement condition. • Full-depth repair: In Iowa, Gross says, this sometimes in- volves placing precast sections of pavement in heavily populated areas where it isn't feasible to close a road for extended periods of time. "They go in manufac- tured onsite, so we can dial them into the pavement and get the road open right away." • Dowel bar retrofitting: This re- stores load transfer from concrete panel to concrete panel. "If you have faulted joints or there is the load transfer between the joints, road technology | continued (Concrete Pavement Association of Minnesota) [ ] In partial-depth repair, an upper por- tion of the damaged concrete is milled out, then a slurry mixture is added.