Chris Kufner, Metro Materials Engineer
2015 CPAM ConferenceMarch 13, 2015
I-35
North Branch to Harris, MN
7 miles
4 lane divided
28,000 ADT
280,000 WADT
6.2 % Trucks
1969 Construction◦ 22 miles
◦ 8” bituminous pavement
◦ 4” aggregate base
◦ 12” sand
1987 Bituminous Overlay◦ 4.75” bituminous overlay
1991 Crack Sealing
Cupped cracks◦ Variety of maintenance efforts
Tried to fund m/o in 2003
Video
Stimulus funding for 7 of 22 miles
36 Cores◦ 12.5” AVG THICKNESS
Rigid Pave would have yielded 9” pcc
MnROAD success led to 6” x 6 x 6
LCCA compared 6” bituminous to 6” concrete
Pre Alternate Bid
PCC Selected!
195,000 square yards of 6” pcc paving
Sawed into 6’ x 6’ panels
1/8” sawcut, filled with 3725 hot pour
Tie bars at all three longitudinal joints
Bituminous milling, paving, lighting, drainage, traffic control, striping, crossovers
$8,500,000 to Knife River w/ PCI as paver
~$300,000 per lane mile (total project cost)
PLAN◦ Mill 4” of bituminous◦ Contractor surveying◦ Mill on a stringline◦ Pave on same stringline◦ Pave uniform 6” pcc◦ Mill 2” on outside shdr◦ Pave 4” bituminous shdr
ACTUAL (SB)◦ Milled >4”◦ MnDOT surveying◦ Milled on string◦ Set new string◦ Paved uniform 6”◦ Milled 6” outside bit◦ Paved 6” outside bit
Northbound better!
4 lane divided built crossovers
Reduced to one lane each direction
Ramps at Harris closed directionally
Weekday rush hour peak◦ 2 mile backup
Weekends◦ 7 – 10 mile backups
◦ >1 mile backup on alt. route
Late July to early October
Supplemental Agreement written for:acceleration, police,dynamic merge
2015
2015
49,280Panels
NB vs
SB
2011/2012 bituminous mill and overlay
Forest Lake to North Branch
2.5” mill and 4” overlay
ultra thin bonded wear crs
$200,000 /lane mile
Off peak construction, minor impact to traffic