Presented at the AEMA-ARRA-ISSA Annual Meeting February 19-23, 2013

Renaissance Esmeralda Resort Indian Wells, California

Ben Berkach

Superintendent, PSI Technologies Inc.

February 21, 2013

Modeling Micro Surfacing Rut Fill as a Structural Treatment to

Reduce Surface Shear Strain

• PSI Technologies Inc. – Dr. Roberto Soares – Rielle Haichert, P.Eng. – Diana Podborochynski, E.I.T. – Vanessa Garcia – Katelyn Broda – Dr. Curtis Berthelot, P.Eng.

• Morsky Construction • Saskatchewan Ministry of Highways

and Infrastructure

ACKNOWLEDGMENTS

PSI TECHNOLOGIES INC.

• Founded and based in Saskatoon, SK Canada.

• Originated as a Transportation Infrastructure Engineering Consulting and Construction company in 1998.

• PSI Technologies is unique in that we specialize in Engineering and Construction Services.

• Engineering Services include Asphalt, Aggregate and Soils (QA/QC) Testing, Transportation Infrastructure Services, Project Management and Structural Asset Management (HWD & GPR).

• PSI Technologies Central Laboratory is CCIL Certified in Aggregate Testing (Type C & D).

• Construction Services include Crushing Operations, Culvert Replacement, Road Construction, Demolition & Recycling and Subsurface Drainage Systems.

• PSIPave3D™ Mechanistic Road Modeling.

• Find out more by visiting our website: http://www.psitechnologies.ca/

PSI TECHNOLOGIES INC.

PSI TECHNOLOGIES INC.

MICRO SURFACING IN SASKATCHEWAN

0

200

400

600

800

1000

1200

140019

96

1997

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

Lane

Km

/ Va

lue

Construction Year

MICRO SURFACING

Lane km

$ (x 10,000)

$ / t (x 10)

PURPOSE OF THIS STUDY • Demonstrate Benefits of Modeling Micro Surfacing as a

Structural Treatment (Surface Shear). – Non Destructive HWD Testing – PSIPave3DTM Numerical Computational Modeling

MICRO SURFACING HWD TEST SECTIONS

1

2

3

Pre Construction

Surface Shear Rutting

HEAVY WEIGHT DEFLECTOMETER (HWD)

Loading Plate

Sensors

PSI Technologies’ HWD

HWD VERTICAL DEFLECTION TEST RESULTS

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.8016

.990

16.9

9216

.994

16.9

9616

.998

17.0

0017

.002

17.0

0417

.006

17.0

0817

.010

18.8

6018

.862

18.8

6418

.866

18.8

6818

.869

18.8

7218

.874

18.8

7518

.877

18.8

8520

.099

20.1

0120

.103

20.1

0620

.108

20.1

0920

.111

20.1

1420

.116

20.1

1820

.120

Test Section 1 Test Section 2 Test Section 3

Peak

Sur

face

Def

lect

ion

(mm

)

Pre ConstructionPost Construction

Peak Surface Deflection (mm) at Primary Weight Limits

POST CONSTRUCTION SURFACING LOGS

Layer Number Thickness (mm)Construction

Type

6 25 2012 MIC5 13 1992 GAS4 27 1986 GAS3 150 1986 GB2 250 1986 GSB1 18 1978 CBC6 25 2012 MIC5 13 1992 GAS4 27 1986 GAS3 150 1986 GB2 250 1986 GSB1 18 1978 CBC6 25 2012 MIC5 13 1992 GAS4 13 1986 GAS3 16 1985 GAS2 220 1985 GB1 18 1978 CBC

Layers on Top of SubgradeDirection/

Wheel PathHighway Section

Number Chainage (km)Subgrade

Classification

Silty Sand

Silty Sand / Clay

Silty Sand / Clay

20.120 to 20.100

16.990 to 17.010

18.880 to 18.860

P o

s t C

o n

s t r

u c

t i o

n

17 03-1NBDL/IWP

SBDL/OWP 17 03-2

17 03 -3SBDL/OWP

MICRO SURFACING HWD TEST SECTION

Post Construction

PSIPAVE3D™ ROAD MODEL •Advanced 3D Model Incorporates Varying Geometry, Road Layer Thicknesses, Materials, Load Spectra, Load Types, Climatic Conditions, etc.

o Uses mechanistic material properties to assess the fundamental mechanistic primary responses directly related to long term pavement performance.

o 3D Finite Element approach

for road structural analysis & design.

o Measures normal and shear

strain in all pavement layers.

Horizontal Strain

Pre Construction Post Construction

PSIPAVE3D™ MODELING RESULTS

High strain Reduced strain

Shear Strain

Pre Construction Post Construction

PSIPAVE3D™ MODELING RESULTS

High Shear Strain Reduced Shear Strain

Horizontal Strain & Shear Strain

Horizontal Strain Percent Reduction = 62% Shear Strain Percent Reduction = 47%

PSIPAVE3D™ MODELING RESULTS

4.00

19.76

1.53

10.52

0.00

5.00

10.00

15.00

20.00

25.00

Maximum Horizontal Strain Maximum Shear Strain

Stra

in (1

0^-4

)

Pre ConstructionPost Construction

CONCLUSIONS • Micro Surfacing Rut Filling is a Structural Treatment in the

sense of reducing surface related distresses that can accelerate structural failure.

• Micro Surfacing reduced strains at top of the HMAC Layer. – Horizontal Strain reduced by 62% – Shear Strain reduced by 47% – Micro Surfacing also appears to demonstrate structural

properties by reducing vertical deflections up to 24% where apriori deflections are > 1.0 mm.

Thank You!

http://www.psitechnologies.ca/