Module 1-2

Introduction to Preventive Maintenance

1-2.1

1-2.2

Learning Outcomes1. Explain the concept of preventive

maintenance2. Discuss the importance of treatment

timing3. List the benefits of a preventive

maintenance program4. Describe a good candidate pavement

for preventive maintenance

1-2.3

Failing to Learn

... or learning from failure

Over-applied band-aid crack sealant leads to moratorium in New York

Cracked windshield claims lead to bans (many agencies)

Claims in Michigan lead to restrictions on double chip seals and microsurfacing

1-2.4

Planned strategy Cost effective treatments Maintains or improves functional

condition Does not increase structural capacity

Defining Preventive Maintenance

Preventive Maintenance Concept

Keeping good roads in good condition!Keeping good roads in good condition!

1-2.5

1-2.6

Preventive Maintenance and Safety

1. Treatments are excellent opportunity to improve safety characteristics

2. Potentially more frequent work zones present challenges to both workers and drivers

3. Safe practices should always be followed

How do preventive treatments differ from routine/reactive treatments?

Similar treatments…different TIMING!

1-2.7

1-2.8

Age of pavement or surface Condition of pavement Next scheduled treatment

Preventive Maintenance Timing

Pav

emen

t C

ondi

tion

(Fun

ctio

nal o

rS

truc

tura

l)

Time (Years)

Preventive Maintenance

Reconstruction

Good

Poor Rehabilitation

DeferAction

Preventive Maintenance Timing

1-2.9

Time or Traffic

Pav

emen

t C

ondi

tion

PreventiveMaintenancePreventiveMaintenance

ReactiveMaintenanceReactiveMaintenance

RehabilitationRehabilitation

Importance of Treatment Timing

1-2.10

1-2.11

Expected Benefits Preserve investment

Improved pavement performance Long term cost savings/leveling

High level of service Increased safety Greater customer satisfaction

1-2.12

Preserving the Investment Keep water out! Reduce debris infiltration into joints or

cracks Slow aging effects of bituminous

pavements Minimize dynamic loads

1-2.13

Maintain good rideability Maintain good surface friction Minimize potentially dangerous

surface characteristics

Maintaining High Level of Service

1-2.14

Impact on Distress Prevent or slow some distresses from

occurring Correct minor surface deterioration

1-2.15

HMA Problems Reduced/Slowed with Preventive Maintenance Oxidation/raveling Block cracking Edge cracking Crack deterioration Roughness Potholes

1-2.16

Minor rutting Raveling Bleeding/flushing Surface friction loss Roughness

HMA Problems Corrected with Preventive Maintenance

1-2.17

PCC Problems Reduced/Slowed with Preventive Maintenance Loss of fines (pumping) Corner breaks Joint faulting Joint spalling Crack deterioration Roughness Blow-ups

1-2.18

PCC Problems Corrected with Preventive Maintenance Joint seal damage Map cracking and scaling Surface friction loss Roughness

1-2.19

Evaluating Pavements for Preventive Maintenance

What you don’t see may be more important than what you do see!

Condition Friction Roughness Ability to carry loads

1-2.20

Good Candidate Pavements for Preventive Maintenance No structural failures Minimal distress (extent and severity) Relatively young in age Minor functional problems Few historical problems with similar

projects

1-2.21

When is it too late for preventive maintenance?

HMA Problems PCC Problems Potholes Severely

deteriorated cracks Delamination Unstable rutting

Blow-ups Corner breaks Severely

deteriorated cracks

1-2.22

Review: Learning Outcomes1. Explain the concept of preventive

maintenance2. Discuss importance of treatment

timing3. List the benefits of a preventive

maintenance program4. Describe a good candidate pavement

for preventive maintenance

JEOPARDJEOPARDY!Y!

1-2.23

Preventive Maintenance (PM) Jeopardy

Intro to Preventive

Maintenance

$100

$200

$300

$400

$500

1-2.24

Introduction to PM - $100 Keeping good roads in good condition

1-2.25

Introduction to PM - $200 Improved performance Greater customer satisfaction Cost savings Increased safety

1-2.26

Introduction to PM - $300 Potholes Severely deteriorated cracks Delamination Unstable rutting

1-2.27

Introduction to PM - $400 Age of pavement or surface Condition of pavement Next scheduled treatment

1-2.28

Introduction to PM - $500 Minor rutting Raveling Bleeding/flushing Surface friction loss Roughness

1-2.29