07p6

Copyright 2006 Roadscanners Oy. All Rights Reserved.


GPR Techniques in Asphalt DiagnosticsTimo Saarenketo, PhD

Managing DirectorRoadscanners

Tomi Herronen, MScOffice Chief

Roadscanners


CONSULTING CONSULTING -- SOFTWARE SOFTWARE -- R&D R&D -- ROAD SURVEYS ROAD SURVEYS –– INSTRUMENTS INSTRUMENTS Focus: existing traffic infrastructure management


ROADSCANNERS GROUP 2007ROADSCANNERS GROUP 2007

Roadscanners Oy

RoadscannersSweden Ab

Rovaniemi

TampereBorlänge

Partners & Dealerships:Partners & Dealerships:

DynatestDynatestGeophysical Survey SystemsGeophysical Survey SystemsAdekAdek3d3d--RadarRadarVianovaVianova Roadscanners Exports 2006

31 %

24 %1 %

12 %

4 %

2 %

5 %

2 %2 %1 %

3 %7 %

6 % SwedenUSACanadaUKLithuaniaNorwayPolandSpainGreeceSouth-AfricaSouth-KoreaIsraelDenmark

Helsinki

Turnover 2006:1.8 M€Consulting 60%Software 16 %Instruments 24 %

Brora

Karlsruhe


ROADSCANNERS2007


FORENSIC SURVEYS WITH GPR:FORENSIC SURVEYS WITH GPR:

ASPHALT AND CONCRETE ASPHALT AND CONCRETE PAVEMENT SURVEYS:PAVEMENT SURVEYS:

PAVEMENT DAMAGE PAVEMENT DAMAGE EVALUATIONS:EVALUATIONS:

•• StrippingStripping•• Moisture BarriersMoisture Barriers•• DebondingDebonding•• CrackingCracking•• SegregationSegregation•• Voids Beneath Concrete Voids Beneath Concrete

Pavement JointsPavement Joints•• Concrete Pavement Concrete Pavement

DelaminationDelamination


TH23 WILMAR, MINNESOTATH23 WILMAR, MINNESOTA

DETECTING STRIPPING IN ASPHALT PAVEMENT:DETECTING STRIPPING IN ASPHALT PAVEMENT:CASE TH23 WILMAR, MINNESOTACASE TH23 WILMAR, MINNESOTA


TH 23, WILLMAR, MINNESOTA, USA, SOUTHBOUND LANETH 23, WILLMAR, MINNESOTA, USA, SOUTHBOUND LANE

Asphalt, soundAsphalt, sound


Asphalt with stripping defectsAsphalt with stripping defects


SubgradeSubgrade

SubgradeSubgrade

DETECTING ASPHALT STRIPPINGDETECTING ASPHALT STRIPPING


GPR IN DETECTING STRIPPING:Case: Killimster Moss, Caithness, Scotland


Motorway A2Ladek Toll Plaza - Modla

Dielectric values

Dielectric values:Blue – High values – MoistRed – Low values – Dry

Surface reflection0 – 35mm

Layer 240 – 80mm

209+100 210+000

215+000

220+000

225+000

230+000

235+000238+200

209+100 210+000215+000

220+000

225+000

230+000

235+000238+200


Wr-La South - Deformation


Chloride Related Problems: E4 Chloride Related Problems: E4 –– Vid HVid Hööga Kusten; Sweden 1998ga Kusten; Sweden 1998


Chloride Related ProblemsChloride Related ProblemsKemiKemi –– Tornio Tornio Motorway 2001Motorway 2001--20022002


Frozen and thawed drill cores Frozen and thawed drill cores


FWD Data: fall 2001, spring 2002


0

1000

2000

3000

4000

5000

6000

7000

8000

2500 3500 4500 5500 6500 7500 8500 9500 10500 11500 12500 13500 14500 15500 16500 17500 18500 19500

(m)

MPa

To_Ke_E1_2002To_Ke_E1_2001

Syksy 2001: ka 3167 MPa

Kevät 2002: ka 1717 MPa

ABK + BST ABK + BST moduulitmoduulit 2001 2001 jaja 2002 2002 --SuuntaSuunta TornioTornio –– KemiKemi, , oikeaoikea kaistakaista

((LaskettuLaskettu Road Doctor Road Doctor –– ElmodElmod 4.5 4.5 OhjelmistollaOhjelmistolla))

Asfalttiliitto ryPäällystekurssit 2003








GPR DATA ANALYSIS OPTIONS IN ASPHALT FORENSICSGPR DATA ANALYSIS OPTIONS IN ASPHALT FORENSICS


Integrated Analysis of GPR, FWD and Drill CoresIntegrated Analysis of GPR, FWD and Drill Cores


Calculating BC paramameters and Risk AnalysisCalculating BC paramameters and Risk AnalysisCASE B871 CASE B871 –– Kinbrace to SyreKinbrace to Syre

GPR dataGPR data

Pavement thickness (mm)Pavement thickness (mm)

FWD FWD deflecionsdeflecions

urauraBC ClassBC Classstrainstrainsubgr modulisubgr moduliR300 defl radiusR300 defl radius

DistressDistress

Ant. heights.Ant. heights.

Er valueEr value

Risk classRisk class


Swedish Bearing Capacity Indexes: Strain in Asphalt Bottom (microstrain) - HW 6 Lappeenranta


Swedish Bearing Capacity Indexes: Deflection radius R300 (mm) - HW 6 Lappeenranta


1.5 GHz GPR data1.5 GHz GPR dataAsphaltAsphaltBound BaseBound Base

Unbound BaseUnbound Base

Sub BaseSub Base

SubgradeSubgrade

Surface dielectrics measured by 1.0 GHz Horn antenna Surface dielectrics measured by 1.0 GHz Horn antenna

DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE (defects close to surface)(defects close to surface)


Right lane

Left lane

Section 3 Section 4 Section 5 Section 6

Heavy trucks use left lane Heavy trucks use left lane –– higher distress level higher distress level –– higher higher asphalt dielectric deviationasphalt dielectric deviation

DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE

Roadscanner 2007


seaside

Upper dike

DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE Case FrieslandCase Friesland


DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE DIELECTRIC VALUE DEVIATION OF ASPHALT SURFACE Case FrieslandCase Friesland


AMPLITUDE ANALYSIS AND TIME SLICE DISPLAYAMPLITUDE ANALYSIS AND TIME SLICE DISPLAY


Wr-La South - Cracks


Attenuation Analysis

Attenuation 3 ns

Attenuation 6 ns

1.0 Ghz Horn antenna data, channel 1


0

2

4

6

8

10

12

14

16

0 0,5 1 1,5 2 2,5 3

frequency (GHz)

imag

inar

y pa

rt K

´´

#14 Tohmo Granite , K´´-dry#14 Tohmo Granite , K´´-ads#6 Limestone K´´-dry

#6 Limestone K´´-ads

#2 Gran/Bas K´´-dry

#2 Gran/Bas K´´-ads

0

2

4

6

8

10

12

14

16

0 1 2 3frequency (GHz)

real

par

t K´

#14 Tohmo Granite , K´-dry#14 Tohmo Granite , K´-ads#6 Limestone K´-dry

#6 Limestone K´-ads

#2 Gran/Bas K´-dry

#2 Gran/Bas K´-ads

2

2,4

2,8

3,2

3,6

4

0,000 1,000 2,000 3,000

frequency (GHz)

diel

ectr

ic v

alue

, rea

l par

t K

K'-fresh K'-10h agedK'-15h aged

Analysing Frequency Response in Asphalt

Roadscanner 2007


Analysing Frequency Response in Asphalt


GPR profile from center line

Thickness interpretation from center line

Surface map of ballast thickness (blue 0-5ft red ) from all 3 passes

Surface map of ballast fouling index (blue 0 - 45 red ) from all 3 passes

Ballast fouling index curve average from 3 passes (left, center, right)

Fouling index classification 0=0-10, 1=10 to <20, 2=20 to <40, 3= >40 + Comments

ROADSCANNERS RAILWAY ANALYSIS OUTPUT EXAMPLE


High Frequency Ground Coupled Data AnalysisHigh Frequency Ground Coupled Data Analysis



SubgradeSubgrade



SubgradeSubgrade


High Frequency Ground Coupled Data AnalysisHigh Frequency Ground Coupled Data Analysis


A.

B.

Ensuring that Base Course is Ok


Monitoring moisture: Dielectric value in base course surface - HW 6 Lappeenranta

Roadscanner 2007


Integrated GPR + Digital and Thermal Camera Analysis


3D GPR technique3D GPR technique

Roadscanner 2007


Segregation on top asphalt layer

3d Radar Tests on Airports3d Radar Tests on Airports

Roadscanner 2007


3d radar Pavement Distress Diagnosis

Cracks in second overlay

level 80 mm

level 130 mm

Severe pavement distress in 3rd layer

Cable

3200 3300


Bottom/sea

Top

Time slice:10 cm depth (Er=7)

Longitudinal profile Cross section

Asphalt bottom

Bottom/sea

Top

Time slice:10 cm depth (Er=7)

Longitudinal profile Cross section

Asphalt bottom






Thank You!Thank You!


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07p6