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From page 47... ... 47 Case Examples Unbonded Concrete Overlay of Asphalt on U.S. Highway 18 in Iowa Key features: Pilot-car operations with single-lane traffic through work areas, established maximum work zone lengths, a staging plan specifically established for efficient operations and to reduce disruptions, 3D stringless milling operations, 3D stringless paving operations, realtime smoothness measurements, concrete curing and strength gain monitored using maturity sensors for opening to traffic, early-entry saws for cutting transverse and longitudinal joints, portable signs that could be moved with operations, a longitudinal safety wedge along the length of the first paved lane to eliminate drop-off, and public meetings immediately prior to paving operations. Read the entire page →
From page 48... ... 48 Construction and Rehabilitation of Concrete Pavements Under Traffic The original plans called for milling 0.5 in. and overlaying with 4-in. Read the entire page →
From page 49... ... Case Examples 49 single-lane slipform paver in two 16-ft-wide passes with two different pavement depths simultaneously, 4.5 in. for the roadway and 8 in. Read the entire page →
From page 50... ... 50 Construction and Rehabilitation of Concrete Pavements Under Traffic at the same time. Moving the paver was relatively easy because equipment design allowed for moving the paving train from one site to another in less than one day and the stringless paving process enabled the contractor to make moves quickly. Read the entire page →
From page 51... ... Case Examples 51 strength. The meeting was announced through a flyer that was hand delivered to each local residence prior to the meeting and included visual displays of the paving schedule. Read the entire page →
From page 52... ... 52 Construction and Rehabilitation of Concrete Pavements Under Traffic This section of Interstate 66 was 9-in. JRCP built in the early 1960s (Figure 18) Read the entire page →
From page 53... ... Case Examples 53 lane. The panels were usually set between 11:30 p.m. Read the entire page →
From page 54... ... 54 Construction and Rehabilitation of Concrete Pavements Under Traffic made significant improvements to processes and procedures that increased productivity by the third week from fewer than 8 panels per night to 10 panels per night. By the end of the project, up to 12 panels were placed per night for the 12-ft-wide panels and 6 panels per night for the 27-ft-wide panels. Read the entire page →
From page 55... ... Case Examples 55 30% trucks. In 20 years, the traffic is projected to grow to almost 80,000 vehicles per day, with peak-hour traffic of about 7,000 vehicles per hour. Read the entire page →
From page 56... ... 56 Construction and Rehabilitation of Concrete Pavements Under Traffic also partnered with Ohio DOT to make sure that weekend closure of a ramp was not needed by adjusting the phasing and slightly accelerating work in the area of the ramp during its specified 120-day closure period. The contraflow configuration seemed to confuse motorists and cause several crashes and near crashes at the decision point. Read the entire page →
From page 57... ... Case Examples 57 A B B Bn n[ ] Read the entire page →
From page 58... ... 58 Construction and Rehabilitation of Concrete Pavements Under Traffic Courtesy Ohio DOT. Figure 22. Read the entire page →
From page 59... ... Case Examples 59 Courtesy Ohio DOT. Figure 23. Read the entire page →
From page 60... ... 60 Construction and Rehabilitation of Concrete Pavements Under Traffic westbound side to accommodate four lanes of traffic. Traffic was diverted to the westbound side, with two lanes of traffic in each direction, while the eastbound lanes were constructed (Figure 24) Read the entire page →
From page 61... ... Case Examples 61 projects as appropriate. If any conflicts were to arise, they were to be resolved at the direction of the Tollway. Read the entire page →
From page 62... ... 62 Construction and Rehabilitation of Concrete Pavements Under Traffic durability and longer life. Optimized mixes allow for more effective designs, limited lane closure times, and expedited schedules. Read the entire page →
From page 63... ... Case Examples 63 placed at 50 ft intervals; and (3) producing and delivering concrete to the paver consistently (in terms of batch plant production, timing of delivery, and slump) Read the entire page →
From page 64... ... 64 Construction and Rehabilitation of Concrete Pavements Under Traffic obstruction from overhead signal wires in some locations, low-height tow-truck booms were used instead of conventional cranes to set some of the precast panels. Unbonded Concrete Overlay on Interstate 77, North Carolina Key features: Four lanes of traffic maintained much of the time, DB allowed contractor flexibility in developing MOT plan and time-saving techniques, two-lane-wide detour along the median for the full length of the project, temporary asphalt pavement, wireless maturity testing, and full-width slipform paving equipped with a spreading plow to spread the concrete before it entered the paver, thereby increasing productivity by eliminating a placing machine. Read the entire page →
From page 65... ... Case Examples 65 the project and recycled. The northbound lanes were closed, and two-lane northbound traffic was crossed over on to 25-ft, newly placed asphalt lanes. Read the entire page →
From page 66... ... 66 Construction and Rehabilitation of Concrete Pavements Under Traffic The intersections and side streets were paved under traffic, one lane at a time, as there were no viable detours. When possible, traffic was diverted to one side of the divided roadway, resulting in two-lane, head-to-head traffic. Read the entire page →
From page 67... ... Case Examples 67 time limit was exceeded. The contractor completed this entire project without any pilot-car time-limit violations. Read the entire page →
From page 68... ... 68 Construction and Rehabilitation of Concrete Pavements Under Traffic Bonded Concrete Overlay of Asphalt on State Route 79, Missouri Key features: One-lane traffic with automated timed signal controls, construction partnering, coordination with local agencies, and significant public information activities. A 7.7-mi, two-lane portion of State Route 79 in Ralls and Marion Counties, Missouri, was resurfaced in 2013 using a 5-in. Read the entire page →
From page 69... ... Case Examples 69 process to allow emergency vehicles to travel against traffic were established. Consistent messages were displayed on websites for local tourist attractions, welcome centers, the chamber of commerce, the city of Hannibal, and Missouri DOT. Read the entire page →
From page 70... ... 70 Construction and Rehabilitation of Concrete Pavements Under Traffic An additional lane in each direction of the Interstate was provided during construction to reduce delays, thus exceeding contract requirements for number of lanes open during construction. The contractor used accelerated bridge construction techniques extensively throughout the project to expedite the construction schedule. Read the entire page →
From page 71... ... Case Examples 71 (Figure 35) Read the entire page →
From page 72... ... 72 Construction and Rehabilitation of Concrete Pavements Under Traffic An optimized, durable concrete mixture with adequate entrained air and reduced permeability was used. The dense, well-graded mixture had reduced paste content and 30% of the Portland cement replaced with ground, granulated blast furnace slag. Read the entire page →
From page 73... ... Case Examples 73 Two-way, two-lane traffic was maintained by diverting southbound traffic to the northbound direction across the median when constructing the southbound lanes. Northbound traffic was diverted to the southbound direction when constructing the northbound lanes. Read the entire page →
From page 74... ... 74 Construction and Rehabilitation of Concrete Pavements Under Traffic the construction process by providing a rigid vertical surface against which to pave and compact. The access roads inside the parking lot were paved with 6-in.-thick RCC. Read the entire page →
From page 75... ... Case Examples 75 operation to avoid unplanned cracks and poor-performing fresh joints (Hossain and Ozyildirim 2015) Read the entire page →

From page 47...

... 47 Case Examples Unbonded Concrete Overlay of Asphalt on U.S. Highway 18 in Iowa Key features: Pilot-car operations with single-lane traffic through work areas, established maximum work zone lengths, a staging plan specifically established for efficient operations and to reduce disruptions, 3D stringless milling operations, 3D stringless paving operations, realtime smoothness measurements, concrete curing and strength gain monitored using maturity sensors for opening to traffic, early-entry saws for cutting transverse and longitudinal joints, portable signs that could be moved with operations, a longitudinal safety wedge along the length of the first paved lane to eliminate drop-off, and public meetings immediately prior to paving operations.