Cement Stabilized Base & Chipseal County Road 54 NRRA Pavement - - PDF document

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Cement Stabilized Base & Chipseal County Road 54 NRRA Pavement - - PDF document

Feb 05, 2024 184 likes •707 views

5/24/2017 Cement Stabilized Base & Chipseal County Road 54 NRRA Pavement Conference May 24, 2017 John Brunkhorst, PE - McLeod County Engineer Dave Rettner, PE - American Engineering Testing Inc. CR 54 CSFDR NRRA Presentation 1

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5/24/2017 CR 54 CSFDR NRRA Presentation 1

Cement Stabilized Base & Chipseal

“County Road 54”

NRRA Pavement Conference May 24, 2017

John Brunkhorst, PE - McLeod County Engineer Dave Rettner, PE - American Engineering Testing Inc.

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  • 1. Background
  • 2. Project Overview
  • 3. Construction Highlights
  • 4. Design Process
  • 5. Construction and Performance Testing
  • 6. Costs
  • 7. Lessons Learned
  • 8. Next Steps

T

  • pic s
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Located approximately 60 miles west of the Twin Cities

Where is McLeod County?

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County Road 54 (CR 54)

~ 6 miles South of Hutchinson, MN

Where is Project?

PROJECT LOCATION

Length: ~1 mile

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County Road 54

  • Gravel Road
  • Primarily serves rural housing development
  • Seasonal agricultural traffic
  • ~ 200 ADT
  • County Funded (non State Aid route)

BAC KG RO UND

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CR 54 Issues

  • ~$5,000 Annually for Dust Control (CaCl2)
  • Washboards (due to speed/braking)
  • Frequent Blading Required
  • No Funding for traditional base and surfacing

Goals for CR 54

  • Dust Free Road
  • Washboard Free
  • Stand up to Agricultural Traffic
  • Cost Effective

BAC KG RO UND

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2014 Prime/Seal Project

  • CR 54
  • Township Housing Development
  • Nearby County Park
  • Portions of CR 54 began to break up in fall

2015 Reclamation & Tiling Project

  • CR 54

BAC KG RO UND – Pa st Effo rts

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NO W WHAT ?

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Cement Stabilized Full Depth Reclamation (CSFDR) Double Chip Seal & Fog Seal Project Goal – Find the most cost effective optimal cement content and stabilization depth.

  • 4 Test Sections
  • Varying Cement Contents
  • Varying Stabilization Depths
  • Short Section of Single Chip Seal
  • 4% Cross Slope

2016

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PRO JEC T O VERVIEW

Section 1 Section 2 Section 3 Section 4 Cement Content 8 % 7 % 6 % 5 % Stabilization Depth 10” 10” 8” 8” Tack Coat 1300’ 1300’ 1300’ 1300’ Double Chip Seal 1300’ 1300’ 1300’ 1200’ Single Chip Seal

  • 100’

Fog Seal 1300’ 1300’ 1300’ 1300’

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C O NST RUC T IO N Spreading Cement

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C O NST RUC T IO N Spreading Cement

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C O NST RUC T IO N Cement Incorporation

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C O NST RUC T IO N Cement Incorporation

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C O NST RUC T IO N Cement Incorporation

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C O NST RUC T IO N Breakdown Rolling

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C O NST RUC T IO N Breakdown Rolling

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C O NST RUC T IO N Initial Blading

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C O NST RUC T IO N Finish Rolling

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C O NST RUC T IO N Finish Rolling & Final Trimming

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C O NST RUC T IO N Final Trimming

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C O NST RUC T IO N Finished CSFDR

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C O NST RUC T IO N Finished CSFDR

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Seal Coat – Broom prep C O NST RUC T IO N

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Tack Coat C O NST RUC T IO N

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Seal Coat – First Layer C O NST RUC T IO N

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C O NST RUC T IO N Seal Coat – Second Layer

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C O NST RUC T IO N Seal Coat – Second Layer

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8/23/16

C O NST RUC T IO N Fog Seal (sorry no pics )

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DESIG N PRO C ESS

  • Two mix designs
  • One for 8 inch SFDR section, one for 10 inch SFDR

section

  • Relative proportions of gravel to subgrade were

different due to reclamation depths

  • 8” Section Proctor 127.3 pcf at 9.1% moisture
  • 10” Section Proctor 122.6 pcf at 10.5% moisture
  • Target Unconfined Compressive Strength of 250-300

psi at 14 days

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DESIG N PRO C ESS

  • Two mix designs
  • 8” Section
  • 5% Cement Content at OMC
  • 272 psi UCS
  • 10” Section
  • 7% Cement Content at OMC
  • 267 psi UCS
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DESIG N PRO C ESS

  • After lab work was completed the roadways

were graveled and graded, so the roadway had more gravel than the mix designs contained.

  • Likely result was going to be higher strength

than the original mix design

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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • Field Testing
  • Nuclear Gauge for Moisture and Density
  • Water was added to soil as necessary to achieve

(or approach) optimum moisture content

  • Rolling Patterns were performed
  • Several Each Day to account for variability in the

roadway materials

  • Density and moisture was checked during

compaction

  • Density was typically >98% of rolling pattern

density

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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • Field Testing
  • DCP testing was performed post construction for

strength verification

  • Target strengths (minimums)
  • CBR of 20 in 2 days
  • CBR of 50 in 7 days
  • Strengths measured greatly exceeded the targets
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C O NST RUC T IO N & PERFO RMANC E T EST ING

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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • Performance Testing
  • Ground Penetrating Radar
  • Falling Weight Deflectometer
  • IRI
  • Performed October, 2016
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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • GPR - Sections were constructed thicker than

plan

  • 10 inch sections
  • Section 1 – 14.5 inches
  • Section 2 – 14.6 inches
  • 8 inch Sections
  • Section 3 – 11.1 inches
  • Section 4 – 10.1 inches
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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • FWD Results
  • Significant strength increase over non-stabilized

roadway – all stabilized sections > 10 tons

  • No direct correlation between cement content and

strength

Section Length Thickness Modulus Load Capacity feet in. ksi tons/axle South Gravel 1300 4.8 16.7 4.8 1 1300 14.5 362.1 20.0 2 1300 14.6 560.9 21.8 3 1300 11.1 438.6 19.0 4 1300 10.1 280.4 10.8 North Gravel 1300 7.6 16.4 5.4

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C O NST RUC T IO N & PERFO RMANC E T EST ING

  • Ride Quality Results
  • IRI of stabilized sections was significantly higher

than the unstabilized gravel roadway on both ends of the project

Section Length IRI feet in./mi. South Gravel 1300 84.8 1 1300 293.2 2 1300 237.4 3 1300 204.4 4 1300 210.9 North Gravel 1300 149.6

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C RAC K SURVEY - SPRING 2017

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C RAC K SURVEY - SPRING 2017

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C RAC K SURVEY - SPRING 2017

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C RAC K SURVEY - SPRING 2017

Transverse Cracks Longitudinal Cracks Section 1 28 3 Section 2 43 12 Section 3 41 6 Section 4 35 7

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SPRING 2017 1 Year Old

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SPRING 2017 1 Year Old

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SPRING 2017 1 Year Old

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CSFDR Cost/Mile Cost/SY

  • Cement

$ 51,300 $ 3.12

  • Stabilization

$ 16,300 $ 0.99

  • Laydown/Compaction *

$ 15,000 $ 0.93

CHIP SEAL

  • Tack Coat

$ 3,100 $ 0.19

  • 3/8” Seal

$ 22,900 $ 1.40

  • 1/4” Seal

$ 20,000 $ 1.22

  • Fog Seal

$ 3,300 $ 0.20

TOTAL ~$ 132,000 ~$ 8

* County Roller Operators

C O ST S

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L ESSO NS L EARNED Ride

  • Finish longer sections
  • Tough to correct after project
  • Likely include Ride Spec in Future
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L ESSO NS L EARNED Subgrade

  • Need Good Drainage
  • Continue Centerline Tile

Residential Driveways

  • Figure out Transition
  • Potential Plowing Damage

Future Projects

  • No County Operators, One Contract
  • Ensure Samples Match Existing Conditions
  • 2nd Seal – Year 2 or later
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NEXT ST EPS Finish CR 54

  • 1 mile 2017
  • 2 miles 2018

Continue to Monitor More Planned

  • ~14 Miles in 5-Year Plan

Good Tool in Tool Box for Right Road

  • $140,000/mile vs. Traditional Paving ~$450,000+
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QUESTIONS?