Using figure C-1, find .64 on the distress density line.

Proceed vertically to the M (Medium Severity) curve, then

In this appendix is furnished the deduct value curves

horizontally to the left to read a deduct value of 17.

essential for computing the PCI of a pavement sample

unit as used in the manual PAVER system (figs C-1

(3) For 50 square feet of distress type 15 (Rutting) Low

through C-40).

Severity, the density equals

50 x 100 = 2.0.

The curves are provided in alphabetical order according

2500

to distress types, covering first asphalt surfaced

pavement, then concrete pavements.

Using figure C-15, find 2.0 on the distress density line.

Proceed vertically to the L (Low Severity) curve, then to

the left to read a deduct value of 13.

As explained in chapter 3, the following five steps are

involved in calculating the PCI for a sample unit::

c. Step 3. A total deduct value is computed by

a. Step 1. Each sample unit is inspected and

summing all individual deduct values in the sample unit.

distress data recorded on DA Form 5145-R for concrete

or DA Form 5146-R for bituminous pavements.

d. Step 4. The corrected deduct value (CDV) is

b. Step 2. The deduct values are determined from

computed. In the example given in figure 3-3, the total

the deduct value curves in this appendix. The following

deduct value (the sum of all deduct values) was found to

examples are given for a sample unit 25 feet by 100 feet

be 45. The value of q (the number of individual deducts

(2500 square feet):

whose value is greater than 5) was found to be 2. Using

(1) For 6 square feet of distress type 1

figure C-20 find 45 on the TDV line. Proceed vertically to

(alligator cracking) low severity, the density equals

the line q equals 2, then to the left to read a CDV of 33.

6 x 100 =.24.

e. Step 5. The PCI is computed using the relation

2500

PCI = 100CDV. In the example, PCI= 100-33 = 67; the

rating is good.

Using figure C-1, find .24 on the distress density line.

Proceed vertically to the L (Low Severity) curve, then

horizontally to the left to read a deduct value of 4.

The deduct value curves and the corrected deduct value

curves provided in this appendix are needed to solve

(2) For 16 square feet of distress type 1

steps 2 and 4 above.

(Alligator Cracking) Medium Severity the density equals

16 x

100 = .64.

2500

Integrated Publishing, Inc. |