current trial of pavement management system in japan

© PASCO CORPORATION 1953-2010- 1 -

International Seminar on Implementation of Technical Assistance for Road Asset Management in Vietnam

Current Trial of Asset Management in Japan – Japanese Experience

May 31, 2010

Kazuya AOKI, Ph.D.

PASCO Corporation

© PASCO CORPORATION 1953-2010

Contents

1. Current situation of asset management in Japan

2. Deterioration process of road pavement3. Challenges of Pavement asset management

• Evaluation of deterioration performance with inspection data

4. Role of Pavement Management System• Pavement database• Issues of Pave. DB install• Web-Based PMS• GIS-Based PMS

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• Institution (government subsidies)

Current situation of asset management in Japan

1) Current state of asset management practice in Japan (background)– Developing of deterioration forecasting model, LCC evaluation model and optimal repair

model and accumulation of inspection data made it possible to compute the budget planning and repair strategy to minimize LCC by preventive repair and set the service level.

– Starting of making asset management plan for pavement, bridge, tunnel and water utilities.

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• Deterioration forecasting model• LCC analysis model (optimal repair model)

R&D

• Consciousness of importance of maintenance and critical feeling• Accumulation of maintenance database(inspection data)

Asset manager

Environment

　 Practical　realization　of　asset　management(LCC　analysis,　long-term　maintenance　planning　…　)

AM plan to aim the life extension, cost reduction by preventive repair


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0 5 10 15 20 25 30

Elapsed time (year)

Rut

ting

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ume

(mm

)

Deterioration process of road pavement

• Uncertainty of deterioration process of pavement– Deterioration　　of　pavement　is　generated　according　to　various　factors

– It　is　impossible　to　forecast　the　deterioration　process　correctly

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Inspection data on expressway in Japan

© PASCO CORPORATION 1953-2010Elapsed Time (year)

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ting

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1

Challenges of Pavement asset management

• It is difficult to specify the deterioration mechanism from observational data.

Fig. differences in deterioration speed from route on expressway

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Challenges of Pavement asset management

• It is difficult to specify the deterioration mechanism from observational data.

Elapsed Year

Ra

nki

ng

0 20 40 60 80

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1 Fig. Comparison of the deterioration curve of same characteristic route. ( pavement type, traffic, and structure)

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Evaluation of deterioration performance with inspection data

• Main uncertainty of infrastructure asset management– Deterioration performance

• Deterioration forecasting model– Impossible　to　forecast　deterioration　process– But,　possible　to　evaluate　the　past　deterioration　performance　using　archived　inspection　data.

– Possible　to　make　uncertainty　(risk)　small　by　decision-making　using　past　deterioration　performance　evaluation.

• Not　forecasting,　but　evaluation• Important to accumulate inspection data which recorded actual

deterioration performance. • Possible to model an actual deterioration phenomenon by

evaluating deterioration performance using inspection data• Statistical deterioration forecasting model can reproduce the

performance of actual local road- 7 -


Role of Pavement Management System

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Plan

DoSee

Display of inventory data

Summary and indicationsInput of dairy patrol info

Input of repair info

Detailed investigation of repair sections

Daily patrol, repair workChecking of results of

repair works

Annual Level

Do

See Scheduled inspection

Import inspection data to DB

Plan Selection of repair sections, prioritization, budget allocation…

Making list of repair sections

Middle Term Level

Data management

Strategic management

Plan Asset management planning (budget, repair criteria, repair method, service level, inspection interval…)

Do

Check Monitoring of maintenance work, work achievement

Action Planning revision, updating of deterioration forecasting model

Budget simulation

Estimation of deterioration forecasting model

Summary and indication(GIS-based)

Pavement DB

LCC analysis

Performance evaluation


Role of Pavement Management System• Data management (main functions)

– Management and practical use of huge information which are generated on daily maintenance work

• Maintenance and updating of pavement data• Updating of scheduled inspection data• Accumulation of repair information• Reference of pavement inventory data

• Strategic management (optional functions)– Asset management planning, performance evaluation and

updating of planning based on pavement archived database– Application is not necessarily needed (less frequently used)– Asset management technologies are developed in the future

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Role of Pavement Management System

• Main　role　of　PMS　is　accumulating　of　knowledge　data　– Archived inspection data

• Time series evaluation of deterioration performance

– Archived repair data (including test construction data)

• Evaluation of effect of improvement

– Issue about section length• Adjustment with minimum unit of construction for

supporting the annual level (100m in Japan)

• Data coupling of construction data and inspection data is difficult.


Pavement databaseInspection

•Inspection time

•Pavement type

•Inspection method

•Cracking rate (%)

•Rutting (average and maximum) (mm)

•Smoothness (mm)

•MCI

Repair history

•Repair time•Repair method•Pavement type•Material type•Repair Cost

Road information

•Road name

•Administration office

•Road type

•Lane No.

•Section length

•Distance mark

•Width

•Attached structure

•Traffic volume

•Cracking rate (%)•Rutting (average and maximum) (mm)•Smoothness (mm)•MCI

1..*

1..*

1..*

1

20m~100m

Current conditions

Deterioration Performance

•Deterioration forecasting model•Hazard rate•Benchmarking index


• Accumulation of time series archived data– In order to evaluate the deterioration performance, it is necessary to

accumulate the time series data that corresponds to pavement life length(10 or 20 years)

• Fixing of evaluation unit– Same position is measured as past measured position. (Pavement is

consecutive facilities)– It depends on the accuracy of measurement equipment (distance meter, GPS)– In Japan, the accuracy of location information is kept by GIS-based map and

photo image data with measuring.– When inspection, information (landmark) to judge the position of each section

is recorded.

Issues of Pave. DB install

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Inspection

RepairInspectio

nRepair

Time　series　

Data　at　the　same　position　is　always　recorded.　

Spacial　　accuracy　


Issues of Pave. DB install• Setting of evaluation length

– Acquired data (inspection and repair data) for the daily maintenance work is secondarily used in asset management.

– Micro data is used for the macro analysis.– A minimum length of the evaluation is adjusted to the judgment of

the repair (find of damage) and the repair section.– In Japan, unit length is basically 100m, but nowadays, in order to

evaluate partial damage, the detailed data of 20m or 50m evaluation is acquired. ( it depends on capability of measurement equipment)

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100m 　　　：　　 Cracking rate = 10%

20m 　　　：　　 Cracking rate = 50%


Issues of Pave. DB install• Data update

– if the data update is not executed, database becomes obsolete and the reliability of data decreases.

– Because the data update is complex work, it is a point that it improves the efficiency of the update work.

– Inspection data (batch data input)• Idea ： When the inspection data is made, the inspection data is

put together on the format of DB beforehand. →DB design that automatically can be updated.

– Repair data （ input in each case)• Idea ： making of easy interface to input repair data for all users

and the situation and the place of construction are recorded by photograph data etc.

– Web-Based application• Efficiency improvement of data input work

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Web-Based PMS

• Database is managed collectively in a central office• The system function is limited by each user

– AM manager ： Strategic management– Field worker ： data input and browse

• The maintenance of system and data is easy.• Depends on network infrastructure

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LAN

Server

Repair data

Patrol data

input

Inspection data

Install (auto)

Strategic management functions

Data management functions


GIS-Based PMS

• Basic window

(a) Legend and layer manage

(b) Map and attribute display

(c) function tool bar

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GIS-Based PMS

100m

20m

Integrated evaluation of 20m data

Detailed damage data

• Inspection data– Time series data

• Current state of pavement– 100m, 20m

• Repair archived data• Road inventory and environmental

data– Traffic data, etc.

• Deterioration hazard rate• Structural survey result • Repair candidate section info.

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GIS-Based PMS

• Display of comparative assessment (each route) result of deterioration risk

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GIS-Based PMS

• Computing the repair criteria and repair cost– repair criteria for each route– Monte Carlo simulation model

• Influence analysis given to service level of pavement– Under budget constraint

Monte Carlo simulation conditions

Simulation results

Budget constraintOutput and map view

Repair cost Repair length

Average service level Service level

Simulation condition settingOutput sample

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current trial of pavement management system in japan

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