Better Roads

Better Roads June 2014 15 Applications & Innovations With traffi c diverted to one lane, the work hours on the I-94 project were restricted to 9 p.m. to 8 a.m. six nights per week, with designated times that the contractor could not in- terfere with traffi c. "While the cost of removing every transverse joint fol- lowed by diamond grinding sounds expensive, the overall project cost is far less than the overall project cost of the oth- er treatment options available," IGGA's Robert says. He also notes with diamond grinding, the work is able to be com- pleted with only minor inconvenience to the travelling public. Considering all the factors, full-depth patching coupled with diamond grinding was the most economical solution that can exceed a 20-year minimum life and be constructed at night under traffi c, Roberts notes. Targeting the problem areas IGGA member Interstate Improvement Inc. was awarded the contract in the amount of $8,422,705 for the 11.2 miles of concrete rehab and diamond grinding. With the cost at $752,027 per mile for the total project, the concrete items were only $537,134 per mile. The cost of the full-depth re- pairs was $420,089 per mile. Interstate Improvement worked with their concrete supplier Cemstone Products Company to develop two different full-depth mix designs. One mix was designed to reach the required DOT com- pressive strength of 3,000 psi in about fi ve hours, and the second mix was designed to reach strength in about three hours. Having two mix designs ensured Interstate Improve- ment Inc. could open the patched area to traffi c at 8 a.m., yet reduce the cost by using the fi ve-hour mix when possible. Also helping to conserve time and materials was the fact that MnDOT has always designed their full depth patches at a length along centerline of 4 feet or less. "Most states use 6 feet as a minimum length and thus sometimes remove good concrete just to make a 6-foot patch," says Frentress. "But Minnesota has an excellent service record with the 4-foot patch and understands that they can get three joints fi xed in- stead of two joints with the same amount of concrete." (Edi- tor's note: IGGA supports diamond grinding.) This article and photos are courtesy of the International Grooving and Grind- ing Association (IGGA). CUSTOM LUBE TRUCKS BECAUSE NOT EVERY JOB SITE IS THE SAME. 877-OIL-VACS WWW.SAGEOILVAC.COM Text INFO to 205-289-3789 or visit www.betterroads.com/info A&I_BR0614.indd 15 6/2/14 9:56 AM

• Cover
• ROAD SCIENCE: Down to the Dirt: Intelligent and new technologies are revolutionizing soil compaction. Better Roads takes a look at new technologies of soil compaction, covering high performance vibration via variable drum frequencies, high and low amplitu
• APPLICATIONS & INNOVATIONS: Minnesota's New Solutions for Aging Pavement: Using myraid concrete pavement restoration techniques, this state DOT minimized cost and traffic disruption while maximizing longevity and optimizing results.
• New Road Products
• Advertiser Index
• Marketplace
• HIGHWAY CONTRACTOR: Fighting Thermal Segregation: A temperature bar can provide a thermal profile in real time to protect against inconsistent densities that can occur if freshly paved asphalt pavement becomes too cool and does not compact properly.
• Transportation Talk: Better Roads Editor-at-Large Tina Grady Barbaccia talks with the U.S. Transportation Secretary Anthony Foxx.
• In Court: No License Doesn't Mean No Payment: Unlicensed contractors on federal construction projects are entitled to payment under the Miller Act.
• The Last Word: Material Handler Tries to Destroy B15 Smartphone: The phone is dropped from 35 feet, plunged in water and more, but can it pass the "Tina Test?" Web Extra Video