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For a teaching portfolio plan for a masters class at the University of Toronto
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Highway Repair: It’s A Group
EffortHow Does the Geotechnical
Engineering Department Contribute?
Why Do We Use Non-Destructive Testing?
Assessing the potential durability of the pavement
Confirming or locating suspected deterioration of concrete
Monitor long-term changes
Determine the position, quality and condition of reinforcement
Minimize the number of destructive tests
Types of TestsNon-Destructive
A non-invasive technique used to determine the integrity or properties of a material
Allows inspection without interfering with a product or element final use
Destructive
Conventional Methods that enable the strength of the concrete to be measured by coring or cutting samples from concrete
Types of TestsNon-
DestructiveDestructive
Partially DestructiveConcrete is tested to failure but the damage is localized and the
member is not significantly weakened.
Name all the destructive and non-destructive testing methods you know
Examples of TestsNon-Destructive Falling Weight
Deflectometer
Radiography
Ground Penetrating Radar
Hammer Rebound Testing
Covermeter
Ultrasonic Pulse
Velocity
Destructive Coring
LOOK IN NDT notes at home
Which of these tests do you think we use on
Ministry Highways?
Tests Employed By The Ministry
Visual Inspection
FWD
Ground Penetrating Radar
Coring
What does the FWD measure
Typical FWD Testing Results
The Evaluation MatrixLoad Transfer Efficiency
Low(Crack < 13mm)
Medium (Crack 13-25mm)
High (Crack >25mm)
Good(>70%)
JPCP - Consider Other Data to Determine RepairJRCP & Joints – Do Nothing
JPCP – Full Depth JRCP & Joints – Consider Other Data to Determine Repair
All – Full Depth Repair
Fair (50-70%)
JPCP – Full Depth JRCP & Joints – Consider Other Data to Determine Repair
All – Full Depth Repair All – Full Depth Repair
Poor(< 50%)
All – Full Depth Repair All – Full Depth Repair All – Full Depth Repair
Using the evaluation matrix and the
example just handed out, which sections of highway would your team suggest need
repair?
The Evaluation MatrixLoad Transfer Efficiency
Low(Crack < 13mm)
Medium (Crack 13-25mm)
High (Crack >25mm)
Good(>70%)
JPCP - Consider Other Data to Determine RepairJRCP & Joints – Do Nothing
JPCP – Full Depth JRCP & Joints – Consider Other Data to Determine Repair
All – Full Depth Repair
Fair (50-70%)
JPCP – Full Depth JRCP & Joints – Consider Other Data to Determine Repair
All – Full Depth Repair All – Full Depth Repair
Poor(< 50%)
All – Full Depth Repair All – Full Depth Repair All – Full Depth Repair
What was actually repaired …