nondestructive pavement thickness measurement jagan...

26
Nondestructive Pavement Nondestructive Pavement Thickness Measurement Thickness Measurement Jagan Gudimettla, P. E. Jagan Gudimettla, P. E. FHWA Mobile Concrete Laboratory FHWA Mobile Concrete Laboratory

Upload: others

Post on 14-Jul-2020

21 views

Category:

Documents


1 download

TRANSCRIPT

Page 1: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Nondestructive Pavement Nondestructive Pavement Thickness Measurement Thickness Measurement

Jagan Gudimettla, P. E.Jagan Gudimettla, P. E. FHWA Mobile Concrete LaboratoryFHWA Mobile Concrete Laboratory

Presenter
Presentation Notes
Good Morning
Page 2: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Presentation OutlinePresentation Outline

Introduction / BackgroundIntroduction / Background

MCL Experience with MIT Scan T2MCL Experience with MIT Scan T2

Current Work with MIT Scan T2 TargetsCurrent Work with MIT Scan T2 Targets

Cost ComparisonCost Comparison

SummarySummary

Presenter
Presentation Notes
My presentation is on a new piece of equipment called MIT Scan T2. It is used to determine thickness of pavements thoguhtt non distructive means. This is the outline of my preesntation.
Page 3: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MIT ScanMIT Scan--T2T2

Page 4: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MIT ScanMIT Scan--T2T2

Page 5: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Introduction / BackgroundIntroduction / Background

Operating Principle Operating Principle

How to use MIT Scan T2How to use MIT Scan T2

Memory ManagementMemory Management

Charging and Operating TimeCharging and Operating Time

Maximum Depth MeasurementMaximum Depth Measurement

LimitationsLimitations

Presenter
Presentation Notes
Operating Principle: The MIT-SCAN-T2 generates magnetic fields to assist in determining the thickness of the asphalt or concrete layer. The device excites “answering fields” generated from eddy currents, which have been induced inside an aluminum or a zinc-plated steel target as a reaction to a pulsed magnetic field. This measuring method is based on the principle of electro-magnetic tomography. Crucial innovations are the application of a sensor field and the analysis of the spatiotemporal answering signal. How to Measure Thickness: Two Modes Memory Management: Data Transfer to PC Charging and Operating Time: Battery Charge: AC or DC, 1.5 hrs of charging, Operating time > 8 hrs or 1000 measurements. Where it cannot be used: Cannot use for CRCP or where reinforcement is present or electromagnetic fields Maximum Measured Depth: 50cms Other Items: Distance between two targets – 0.5m, Weight – 6 pounds
Page 6: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MIT ScanMIT Scan--T2T2

Page 7: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MIT ScanMIT Scan--T2T2

Page 8: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

AccuracyAccuracy

Specified: Specified: ++ 0.5% of the measured depth 0.5% of the measured depth + 3/64 in (1 mm)+ 3/64 in (1 mm)

Translates to 0.1 in (less than 3 mm) for Translates to 0.1 in (less than 3 mm) for 13 in pavement13 in pavement

Metal TargetsMetal Targets

Size and Shape requirementSize and Shape requirement

Metal TypeMetal Type

CostCost

Page 9: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Metal Target DiscsMetal Target Discs

Page 10: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Metal Target DiscsMetal Target Discs

Target ID Maximum Depth, in

AL RO 12 7.0 in

AL RO 30 13.8 in

ST RO 07 4.7 in

ST RO 12 7.0 in

ST RO 30 13.8 in

Page 11: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MCL Field Visit to Washington StateMCL Field Visit to Washington State

Page 12: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MCL Field Visit to Washington StateMCL Field Visit to Washington State

Page 13: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MCL Field Visit to Washington StateMCL Field Visit to Washington State

Core Difference (in)

Difference(mm)

1 0.062 0.062 1.6

2 0.0820.082 2.1

3 0.0430.043 1.1

4 0.047 0.047 1.2

5 0.165 0.165 4.2

6 0.0270.027 0.7

Page 14: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

MCL Field Visit to ArizonaMCL Field Visit to ArizonaMIT T2 Results AZ DOT Cores

Test # Thickness, in Test # Thickness, in

1 15.1 1 15.32

2 15.0 2 15.11

3 15.8 3 14.98

4 15.7 4 15.8

5 15.5 5 15.72

Average 15.42 6 15.28

7 15.42

8 15.63

9 15.07

10 15.39

Average 15.37

Page 15: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

FHWA Work with TargetsFHWA Work with Targets

Measuring MechanismMeasuring Mechanism

Page 16: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Effect of NailsEffect of Nails

No nails 3 Nails Halfway 3 NailsAll the way

Difference, in 0.003 0.011 0.011

1 Nail 2 Nails 3 Nails 4 Nails

Difference, in 0.007 0.007 0.007 0.023

Page 17: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Target OptionsTarget Options

ShapesShapes

Thickness Thickness

OrientationOrientation

Page 18: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Typical Thickness SpecificationTypical Thickness Specification

Lot – 2000 sq.yd – 1 core from each lot

→ one core every 1500 ft

→ 4 cores / lane mile

Page 19: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Typical Thickness SpecificationsTypical Thickness SpecificationsPayment Schedule

Thickness Index Range English (Metric) Percent Payment

0.00 or more (0.00 or more) 103

-0.01 to -0.05 (-0.01 to -1.27) 102

--0.06 to 0.06 to --0.10 (0.10 (--1.28 to 1.28 to --2.54)2.54) 101101

-0.11 to -0.15 (-2.55 to -3.81) 100

--0.16 to 0.16 to --0.20 (0.20 (--3.82 to 3.82 to --5.08)5.08) 9999

-0.21 to -0.25 (-5.09 to -6.35) 98

Page 20: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Estimate for Coring/Depth CheckEstimate for Coring/Depth Check

Contractor / DOT CostsContractor / DOT Costs→→

TruckTruck→→

Core drillCore drill→→

Drill bitsDrill bits→→

Staff time for the drillingStaff time for the drilling→→

Staff time to deliver coresStaff time to deliver cores→→

Staff time for patchingStaff time for patching

DOT CostsDOT Costs→→

Staff time to determine and mark core locationsStaff time to determine and mark core locations→→

Staff to observe the drilling and take possession Staff to observe the drilling and take possession of the coresof the cores

→→

Staff time to make and record the measurementStaff time to make and record the measurement→→

Staff time for the independent assuranceStaff time for the independent assurance

$ 90 - 110 / Core

Page 21: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Estimate for using MIT Scan T2Estimate for using MIT Scan T2

Contractor CostsContractor Costs→→

Staff time for taking MIT Scan T2 Staff time for taking MIT Scan T2 measurementsmeasurements

DOT CostsDOT Costs→→

Staff time for placing TargetsStaff time for placing Targets→→

Staff to observe taking MIT Scan T2 Staff to observe taking MIT Scan T2 measurementsmeasurements

→→

Staff time for the independent assuranceStaff time for the independent assurance

→→

Verification Core Verification Core –– 1 Core for every 10 Targets1 Core for every 10 Targets→→

Target Cost Target Cost -- $2 $2

-- 10 10 MinutesMinutes

-- 10 10 MinutesMinutes

-- 10 10 MinutesMinutes

Page 22: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Cost ComparisonCost Comparison

Assume $30/hr laborAssume $30/hr laborlabor $15labor $15Target $2Target $2Core $10Core $10Total Total $27$27

Per lane mile 4 cores requiredPer lane mile 4 cores required

SavingsSavings

$73 / location $73 / location OR OR

$292 / lane mile$292 / lane mile

Page 23: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

SummarySummary

Easy to UseEasy to Use

NonNon--DestructiveDestructive

ExpedientExpedient

Cost EffectiveCost Effective

Page 24: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

ContactsContacts

Interested in MIT Scan T2 Interested in MIT Scan T2

Contact either:Contact either:–– CPTP ProgramCPTP Program

Sam Tyson (202) 366 1326Sam Tyson (202) 366 1326

Shiraz Tayabji (410) 997 9020Shiraz Tayabji (410) 997 9020

–– Mobile Concrete LaboratoryMobile Concrete Laboratory

Gary Crawford (202) 366Gary Crawford (202) 366--12861286

Jim Grove (202) 366Jim Grove (202) 366--66066606

Jagan Gudimettla (202) 366Jagan Gudimettla (202) 366--13351335

Page 25: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P

Questions ???Questions ???

Page 26: Nondestructive Pavement Thickness Measurement Jagan ...insitutest.com.au/...MIT-SCAN-T2-Jagan-Finding-Cost... · Nondestructive Pavement Thickness Measurement Jagan Gudimettla, P