Análisis del PCI

8/18/2019 Análisis del PCI

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PAVEMENT CONDITION INDEX

Pavement Management

for

Airports, Roads, and Parking lots

By Mohamed Y. Shahin

ASTM D 6433 – 07

Standard Pratie for Roads and Parking !ots

Pavement "ondition #nde$ S%rve&s


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ASTM D 6433 – 07

Standard Pratie for Roads and Parking !ots

Pavement "ondition #nde$ S%rve&s

This methodology covers the determination of roads

and parking lots pavement condition through visual

surveys using the Pavement Condition Index PCI!

method of "uantifying pavement condition.

The PCI is a numerical indicator that rates the surface

condition of the pavement. The PCI provides a measure

of the present condition of the pavement #ased on the

distress o#served on the surface of the pavement$%hich also indicates the structural integrity and surface

operational condition locali&ed roughness and safety!.


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Pavement Condition Index (PCI)

a numerical rating of the pavement condition

that ranges from ' to ('' %ith ' #eing the%orst possi#le condition and ('' #eing the

#est possi#le condition.

Terminology


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Terminology

) pavement condition

rating *a ver#al

description of

pavement condition

as a function of the

PCI value that

varies from +failed,to +excellent,


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PCI Calculation Procedure

The pavement is divided into #ranches that

are divided into sections. -ach section is

divided into sample units.


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Terminology

) Pavement Branch*a #ranch is an

identifia#le part of the pavement net%ork

that is a single entity and has a distinct

function.

) or example$ each road%ay or parking

area is a separate #ranch.


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Terminology

Pavement Section*a contiguous pavement

area having uniform construction$

maintenance$ usage history$ and

condition. / section should have the same

traffic volume and load intensity.

The homogeneous section should #e the

length of a future construction M010pro2ect.


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Terminology

Pavement SampleUnit *a su#division

of a pavement

section that has astandard si&e range3

45'' S ` (''' S

Section

Sample 6nit


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Sample 6nits

Sample Si'e, S(

PavementSetion !engt) !ane *idt) Area, S( +00 -00 300

Divided Rd .%m/er of Samples Sample !engt), (T

-0 +0 -,00 3 -+ + +0 -0 30

-0 +- 63,360 4- - + +- -0 -1-

2ndivided Rd

-0 - +3-,000 3 3 60 +00 +40

-0 30 +,400 +06 63 4 0 3 ++7

00 30 +,000 +0 6 4 0 3 ++7


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Sampling and Sample 2nits

Select the sample units to #e inspected. The

num#er of sample units to #e inspected

may vary from the follo%ing3

a num#er of sample units that provides a 75

8 confidence level

/ll sample units in the section may #e

inspected to determine the average PCI of

the section


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Sampling and Sample 2nits

.etork !evelThe minimum num#er of sample units n! that must #e surveyed %ithin

a given section

9o. of Sample 6nits 9o. of 6nits to #e

inspected( to 5 (

: to (' 4

(( to (5 ;

(: to


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Terminology

Pavement Distress*external indicators of

pavement deterioration caused #y loading$

environmental factors$ construction

deficiencies$ or a com#ination thereof.

Typical distresses are cracks$ rutting$ and

%eathering of the pavement surface.


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P0=C->60-

) Data Sheets$ or other field recording

instruments that record at a minimum the

follo%ing information3 date$ location$

#ranch$ section$ sample unit si&e$ sla#

num#er and si&e$ distress types$ severity

levels$ "uantities$ and names of surveyors.

) -xample data sheets for /C and PCCpavements


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#nspetion Proed%re

The definitions and guidelines for "uantifying

distresses for PCI determination are given in

/ppendix ?( for /C pavements. 6sing this test

method$ inspectors should identify distress typesaccurately 75 8 of the time.

@inear measurements should #e considered

accurate %hen they are %ithin (' 8 if

remeasured$ and area measurements should #econsidered accurate %hen they are %ithin 4' 8

if remeasured.


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Asphalt Concrete (AC) Surfaced

Pavement

Measure the "uantity of each severity level

of every distress type present$ and

recording the data. -ach distress must

correspond in type and severity to that

descri#ed in /ppendix ?(Distress in

Asp)alt Pavements

) 9ineteen distress types for asphaltAsurfaced pavements are listed


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>istress -xample

A!!#AT5R "RA"#. (AT#289

Severity evels3

!*ine$ longitudinal hairline cracks running

parallel to each other %ith no$ or only a fe%

interconnecting cracks.

M*urther development of light alligator

cracks into a pattern or net%ork of cracks that

may #e lightly spalled

:*9et%ork or pattern cracking has

progressed so that the pieces are %elldefined and spalled at the edges.

!o" to #easure*/lligator cracking is

measured in s"uare feet of surface area. The

entire area should #e rated at the highest

severity present.

/lligator or fatigue cracking is a series of interconnecting cracks caused #yfatigue failure of the asphalt concrete surface under repeated traffic loading.


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"al%lation of P"# for Asp)alt "onrete

A"9 Pavement

/dd up the total "uantity of each distress type at each severity level$

and record them in the +Total Severities, section.

>ensity

(;45''D('''.54


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Perent Densit&

>ivide the total "uantity of each distresstype at each severity level #y the totalarea of the sample unit and multiply #y

('' to o#tain the percent density of eachdistress type and severity.

>etermine the deduct value >E! for each

distress type and severity levelcom#ination from the distress deductvalue curves in /ppendix ?;.


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/lligator Cracking >educt Curve

F.7


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Ma$im%m "orreted Ded%t ;al%e "D;9

The follo%ing procedure must #e used to determine the

maximum C>E.

If none or only one individual deduct value is greater than4$ the total value is used in place of the maximum C>E

in determining the PCIG other%ise$

the maximum C>E is calculated as follo%s3

) @ist the individual deduct values in descending order.

) >etermine the allo%a#le num#er of deducts$ m$ from

ig. 5$ or using the follo%ing formula3

m19+00?:D;9@


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Ma$im%m "orreted Ded%t ;al%e "D;9

%here3

m allo%a#le num#er of deducts including

fractions must #e less than or e"ual to

ten!$ and

H>E highest individual deduct value.

or example$m(77J!(''AH>E!

m ( 77J!(''A45.(! F.7


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igure 5


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P0=C->60-

) >etermine total deduct value #y summing individualdeduct values. The total deduct value is o#tained #yadding the individual deduct values$ that is$ ('etermine $ as the num#er of deducts %ith a value

greater than 4.'. or example$ in ig. :$ $ J.) >etermine the C>E from total deduct value and $ #y

looking up the appropriate correction curve for /Cpavements in ig. ?E is the largest of the C>Es.


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>etermine

maximu

m C>E

iteratively

Maximum C>E

PCI(''AMax

C>E

(''A5(


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5(


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Determination of Setion P"#

If all surveyed sample units are e"ual in si&e$ the SectionPCI is the average of the sample unit PCI.

If all surveyed sample units are not e"ual in si&e$ then thePCI of the section PCIs! is calculated as the area

%eighted PCI of the surveyed sample units PCIr ! usinge"uation 53

1

1

( * ) R

ri ri

i

s r n

ri

i

PCI A

PCI PCI

A

−

−

= =

∑

∑


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Determination of Setion P"#

here3

PCIs PCI of the pavement section

PCIr area %eighted PCI of randomlysurveyed sample units$

PCI ri PCI of random sample unit i $

Ari area of random sample unit i $0 Total num#er of inspected random

sample units


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Análisis del PCI

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