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

THANK YOU!

CHRIS KUFNER

651-366-5507

chris.kufner@state.mn.us