Development of a GIS Network for Pavement Management Systems

1
Development of a GIS Network for Pavement
Management Systems
United Arab Emirates University Faculty of
Engineering Graduation Project II

• Group C

2
Project Objectives

• The Main objectives are
• Developing a scientifically sound cost effective
  PMS.
• Using this system to evaluate pavement condition
  , maintenance cost and ranking the pavement
  section.
• Supporting this system with a GIS database.

3
Introduction

• Project classification.
• Design analyses (ABET criterion).
• Distress is any irregularity in the pavement
  that may effect the ride quality.
• PMS is a set of tools that help the decision
  makers to select the best way of M R for a
  particular Pavement.
• PMS is used to optimize resources.

4
Introduction

• Present condition index PCI is used as an
  indicator of the pavement condition.
• GIS is defined as a combination of layers of
  information that is related to a specific place.
• These layers give the decision makers better
  understanding of the place.

5
Distresses Classified as
Functional Improper drainage. Drying and wetting
Structural High load repetitions. High tire
pressure.
6
Samples of Pavement Distresses
7
Samples of Pavement Distresses
8
Approaches to Select M R Alternatives

• Ad Hoc
• Depends on past experience.
• Few M R alternatives.
• Best alternative may not be selected.

• Present Condition
• Depends on the exist condition.
• The selected M R will improve the pavement
  condition, but it may not be the most cost
  effective solution.

• Life Cycle
• Depends on the exist and future condition.
• The selected M R is the most suitable and cost
  effective solution.

9
Summary of Project Tasks

• Literature review
• Library and internet search for information
  about
• Pavement distresses.
• PMS.
• GIS.
• Data collection (For three sections in Al Ain)
• Distress types.
• Severity.
• Intensity.
• Base map development (Stage 1).

10
Summary of Project Tasks

• Base map development (Stage 2).
• MS EXCEL sheet
• PCI.
• Cost.
• Spatial Data Analyses

11
Section Definition

• The selected network was divided into smaller
  parts called sections for managerial purpose.
• The entire section should have the same
• Pavement Structure.
• Traffic.
• Construction History.
• Pavement Rank.
• Drainage.
• Condition.
• The section dimensions are
• Length 1500 m
• Width 7.5 m

12
Divide section into S U
Pavement Condition Survey Rating Procedure
Determine number of S U to be surveyed
Calculate the PCI
Perform condition survey
13
Dividing the Section into Sample Units

• The selected section was divided into sample
  units for the purpose of inspection.
• Each sample unit should have an area of
• 160 to 320 m2.
• The selected dimensions of each sample unit
  (figure).
• The total number of sample units N 50 S U.

14
Determining the Number of units to be Surveyed

• In Project level inspection the following
  procedure is followed

Step 1
Determine the minimum number of Sample units (n).
15
Step 2
Determine the interval. Interval N/n 50/13
3.8 Interval 3
Step 3
Select the first S U Randomly, then use the
interval to select next S Us.
16
Field Inspection

• Inspection sheet was used to record distress
• Type.
• Severity.
• Quantity.

17
Inspection Sheet
18
Distresses
19
PCI Calculation Procedure

• Step1 Determine deduct values.
• Calculate the density percentage.
• Density (Quantity /S U Area) 100
• Determine the deduct value form the Deduct value
  curves.

20
PCI Calculation Procedure

• Step 2 Determine the maximum allowable number of
  deducts (m).
• Determine the maximum allowable number of
  deducts. m 1 (9/98)(100- HDV).
• Reduce the number of deduct values to m. if the
  deduct values are fewer than m, then all of the
  deduct values should be taken.
• List the deduct values in a descending order.

21
(No Transcript)
22
PCI Calculation Procedure

• Step 3 Determine the maximum number of corrected
  deduct value (CDV).
• Determine the number of deducts gt2, q.
• Determine the total deduct values by adding all
  individual deduct values.

23
PCI Calculation Procedure

• Determine the CDV form q and total deduct value
  for the first iteration by looking for the
  appropriate correction curve.

24
PCI Calculation Procedure

• Set the minimum deduct value gt2 to 2 in the next
  iteration and repeat the steps.
• Select the maximum CDV form the calculated CDVs
  as the largest value.
• Step 4 Calculate PCI by subtracting the maximum
  CDV form 100.

25
(No Transcript)
26
Excel Sheet Preparation

• a program was made to calculate the PCI and
  maintenance cost.
• PCI calculation procedure was used in Excel.
• The benefit of this program is to save time and
  effort that may spent in manual calculation.

27
Procedure

• The deduct value curves for each severity level
  were best fitted using MS Excel .

28
Procedure

• Points were taken on the curves of alligator
  cracking and the x and y values for each point
  were recorded.

29
Procedure

• The relation between the density and deduct value
  of the curve were drawn and the equation of each
  severity level curve was determined.

30
Procedure

• Two or more equations were determined for each
  curve to get accurate results.
• The same steps were done to get CDV equations.

Excel Sheet
31
Critical PCI Value

• Critical PCI is the PCI value at which the rate
  of PCI loss increases with time.
• Usually this value ranges form 70 to 55 .

32
Methods of M R
1- Stop Gap It is defined as the M R
needed to keep the pavement operational
in a safe condition.
2- Preventive It is defined as the M R
activities applied to the pavement to slow the
rate of deterioration.
3- Major It is defined as the M R
activities applied to the entire section to
improve or correct the pavement condition.
33
1- Stop Gap

• Called safety stop gap.
• Applied for localized segments of pavement
  section.
• Applied with PCI lt Critical PCI.

34
2- Preventive

• Divided into two types, localized and global.
• Localized applied on specific parts of the
  section.
• Global applied on the entire section.
• Applied on sections with PCI gt Critical PCI.

35
3-Major

• Applied on the entire section to repair the
  severe distresses.
• Applied on sections with PCI lt Critical PCI.
• Consists of Two types, full reconstruction and
  thick overlay.
• The section PCI will resume to 100.

36
(No Transcript)
37
GIS Map Development

• Three maps were drawn using Auto CAD.
• The maps were imported to MapInfo.

38
GIS Map Development

• Each sample unit were represented on the map.

39
GIS Map Development

• Tables were created to store sample units data.

40
Conclusion

• Tasks for this semester were completed.
• The data for the three selected sections were
  collected.
• Base map were prepared to enter distress data for
  each sample unit.

41

Thank You.