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 …