REMAINING SERVICE LIFE

Lecture 14

Concept of remaining service life How remaining service life is used and its

importance How remaining life is calculated

Instructional Objectives

RSL: definition Analysis

- Step 1: determine RSL for each pavement

section

- Step 2: examine how RSL distribution in

network can be changed

Introduction

Define threshold values Develop condition indices Develop performance curves Define RSL categories Define RSL cost matrix Define RSL construction effort

matrix

Developing an RSL Analysis

Category I: RSL = 0 Category II: 0 < RSL 5 Category III: 5 < RSL 10 Category IV: 10 < RSL 15 Category V: 15 < RSL

Defining RSL Categories

Example RSL Cost Matrix

Example Construction Effort Matrix

Calculate RSL for each section Show RSL distribution on network Predict future RSL distribution Apply different levels of effort and examine

effects on future RSL distribution

The RSL Analysis

Calculating the RSL for a Pavement Section

Time (years)

Current Condition

Serviceable

Unserviceable

ThresholdValue

Now

Performance Curve

Remaining Service Life

Con

ditio

n In

dex

RSL Distribution

Cat

egor

y I:

O y

ears

Cat

egor

y II:

1-5

yea

rs

Cat

egor

y III

: 6-1

O y

ears

Cat

egor

y IV

: 11-

15ye

ars

Cat

egor

y V:

15+

year

s

% L

engt

h of

Net

wor

k

RSL Category

Calculating the Future RSL

Assume the cell ‘EII-V’ equals 10 in the Construction Effort Matrix

Example Future RSL Distribution

RSL reliability is function of reliability of condition survey and performance curves

Future RSL distributions are network level not project level

Practical Considerations

Sophisticated PMS “carries along” RSL calculations with life-cycle cost

RSL distribution a result of PMS analysis

Future Trends

5-Year Analysis

Definition - RSL RSL Analysis Requirements

Summary

Concept of remaining service life How remaining service life is used and its

importance How remaining life is calculated

Instructional Objectives