S.P. 8680-1652011 MnROAD Reconstruction

Pre-Letting Conference

April 8, 2011

Low Volume RoadMainline (I-94)

Stockpile Area

•Secured Area• Roadway Closed to Traffic

Cell 105-205

& 6

Cell 63 & 96

Demo Slab(200’)

XXXX

XXXXX

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Construction Timeline• Construction will begin July 11, 2011 or 8

days after notice to proceed, whichever is later

• Construction Completion Date is September 1, 2011

Removals Existing Cells105 205 106 206 63

4“(2% cross

slope)

4“(2% cross

slope)

2"64-34 2"64-34

4”

5" 5"1" PSAB 1" PSAB

8"58-28

93HMA

7.5"cracked'93 PCC

(1.5% cross slope)

7.5"'93 PCC

(1.5% cross slope)

6" Cl 1Stab Agg

6" Cl 1Stab Agg

6" class 5

5+”

12*+”

4”

* Subgrade will be excavated to 4% cross slopes.

Grading Work

• OGAB Special, subgrade cross slope 4%, top of base cross slope 2%– Base material to minimum 6” at centerline.

• OGAB Special will be continued and day lighted into ditches.

• Demonstration Slab (Demo Slab)= 6” OGAB Special

306 406

6" 6"

6+" OGAB Special 6+" OGAB Special

InstrumentationDays needed for instrumentation (Mn/DOT) after

- Excavation completion cell 6 (2 days)- Aggregate Base installed cell 6 (3 days)- Removal of concrete and PASSRC cell 5 (2 days)- Install geotextile fabric cell 5 (2 days)

Concrete Paving – 3 Mixes• Cell 505 and 605 Pavement Mix Design shall comply with the

following– CA-15 coarse aggregate gradation.

• Cell 306 Pavement Mix Design shall comply with the following:– CA-35 coarse aggregate gradation.

• Cell 406 Pavement Mix Design shall comply with the following:– Either a CA-15 or CA-35 coarse aggregate gradation.

• Cell 505, 605, 306, 406 shoulders, and Demonstration Slab:– Provide Roller Compacted Concrete (RCC) as per specifications.

Finished Textures

Cell 306 and 406 – Longitudinal Tining

Cell 505 and 605 – Transverse Broom

Cell 63 and 96 – Traditional Grind

Demonstration Slab

1. Located in the stockpile area

2. 200’ long

3. Same operations as shoulders on cell 6

* 4” RCC Concrete

* 6” OGAB Special

* Installed at 4% cross slope.

4. Goal for the demo slab* Experience with materials

* Experience with RCC placement

* Experience with OGAB Special.

Demonstration Slab 200' long x 8' wide

4" RCC

6" OGAB Special

Shoulders

• Cell 505 and 605– RCC Placed directly

on existing materials.– Wick Drains to be

installed prior to paving

– Cell 505 shoulders will be jointed similarly to mainline

– Cell 605 – no joints

• Cell 306 and 406– RCC placed on

OGAB Special– Cell 306 shoulders

will be jointed similarly to mainline.

– Cell 406 – no joints

Cell 63 and 96

• 4” x 5’ x 6’ misc. concrete panel repair in cell 63.

• Both cells 63 and 96 will receive a traditional concrete grind

Extra Research QuantitiesDemonstration Slab• 4” RCC pavement 8’ x 200’• 6” OGAB special 10’ x 202’

Research Samples• 1 cubic yard extra of each concrete mix (3 mixes total)• 15 cubic yards extra of OGAB Special

Questions?

Melissa K. Cole, P.E.

MnROAD Forensic Engineer

(651) 366-5432

melissa.cole@state.mn.us