Asphalt Pavement Magazine - September/October 2017 - 41

Perpetual Pavement Design Software
Layer

Location
otto

Criteria
Tensile train

Units

Target Value Target Percentile

Actual Percentile Pass/Fail?

icro

Pass
Pass
Pass
Pass
Pass

To

Vertical train

icro

Pass

Figure 2: Output Table With New Design Criteria

strain percentile at the top of
subgrade to mitigate non-AC
rutting.
Given these needs and new
developments, PerRoad was
redesigned to implement the new
criteria and enable designers to
execute conventional mechanisticempirical pavement designs
within PerRoad to compare against
perpetual designs when making
pavement type decisions during
the design phase.

Objectives
The PerRoad software was updated
to achieve the following specific
objectives:
* Accommodate strain distribution
criteria for fatigue cracking.
* Accommodate single strain
percentile criteria for rutting.
* Implement conventional,
non-perpetual, mechanisticempirical design.
* Provide other updates and bug
fixes in the software.

18
16
M-E
Perpetual

14

AC Thickness, ini.

vertical compressive strain deeper
in the structure to prevent rutting
of non-AC layers. The computer
program PerRoad enables designers
to consider these critical locations
in the pavement cross-section and
choose appropriate thicknesses and
materials to achieve a Perpetual
Pavement. PerRoad Version 1.0 was
first released in 2003, and the last
major update was completed in 2010
with the release of Version 3.5. The
early versions relied on controlling
bottom-up cracking and rutting
through single threshold response
values that had the potential
to produce overly conservative
designs. The earlier versions of
PerRoad were also only capable of
conducting perpetual design, while
some design situations call for
either conventional mechanisticempirical (M-E) design or a
comparison between perpetual and
conventional M-E designs.
New criteria recommended in
recent research at the National
Center for Asphalt Technology
(NCAT) have shown to produce
more optimal Perpetual Pavement
cross-sections consistent with those
found in the Perpetual Pavements
Award winners1 and those at the
NCAT Test Track. 2 The new criteria
focus on controlling the tensile
strain distribution at the bottom
of the AC and a single compressive

12
10
8
6
4
2
0
0

500

1000
1500
Axle Groups/Day

2000

2500

Figure 3: Conventional M-E Versus Perpetual Design

continued on page 43
Asphalt Pavement Magazine - September/October 2017 * 41



Table of Contents for the Digital Edition of Asphalt Pavement Magazine - September/October 2017

Chairman’s Commentary
Industry News
Back to Basics: Designed to Perform
NAPA President Mike Acott Talks About Thinlays
Asphalt Pavement Alliance 2016 Perpetual Pavement Awards
PerRoad Version 4.3: Perpetual Pavement Design Software
Tools for the Trade
Industry Calendar
Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - September/October 2017 - Intro
Asphalt Pavement Magazine - September/October 2017 - cover1
Asphalt Pavement Magazine - September/October 2017 - cover2
Asphalt Pavement Magazine - September/October 2017 - 3
Asphalt Pavement Magazine - September/October 2017 - 4
Asphalt Pavement Magazine - September/October 2017 - 5
Asphalt Pavement Magazine - September/October 2017 - 6
Asphalt Pavement Magazine - September/October 2017 - 7
Asphalt Pavement Magazine - September/October 2017 - 8
Asphalt Pavement Magazine - September/October 2017 - Chairman’s Commentary
Asphalt Pavement Magazine - September/October 2017 - 10
Asphalt Pavement Magazine - September/October 2017 - Industry News
Asphalt Pavement Magazine - September/October 2017 - 12
Asphalt Pavement Magazine - September/October 2017 - 13
Asphalt Pavement Magazine - September/October 2017 - 14
Asphalt Pavement Magazine - September/October 2017 - 15
Asphalt Pavement Magazine - September/October 2017 - 16
Asphalt Pavement Magazine - September/October 2017 - 17
Asphalt Pavement Magazine - September/October 2017 - 18
Asphalt Pavement Magazine - September/October 2017 - Back to Basics: Designed to Perform
Asphalt Pavement Magazine - September/October 2017 - 20
Asphalt Pavement Magazine - September/October 2017 - 21
Asphalt Pavement Magazine - September/October 2017 - NAPA President Mike Acott Talks About Thinlays
Asphalt Pavement Magazine - September/October 2017 - 23
Asphalt Pavement Magazine - September/October 2017 - 24
Asphalt Pavement Magazine - September/October 2017 - 25
Asphalt Pavement Magazine - September/October 2017 - 26
Asphalt Pavement Magazine - September/October 2017 - 27
Asphalt Pavement Magazine - September/October 2017 - 28
Asphalt Pavement Magazine - September/October 2017 - 29
Asphalt Pavement Magazine - September/October 2017 - 30
Asphalt Pavement Magazine - September/October 2017 - 31
Asphalt Pavement Magazine - September/October 2017 - Asphalt Pavement Alliance 2016 Perpetual Pavement Awards
Asphalt Pavement Magazine - September/October 2017 - 33
Asphalt Pavement Magazine - September/October 2017 - 34
Asphalt Pavement Magazine - September/October 2017 - 35
Asphalt Pavement Magazine - September/October 2017 - 36
Asphalt Pavement Magazine - September/October 2017 - 37
Asphalt Pavement Magazine - September/October 2017 - 38
Asphalt Pavement Magazine - September/October 2017 - 39
Asphalt Pavement Magazine - September/October 2017 - PerRoad Version 4.3: Perpetual Pavement Design Software
Asphalt Pavement Magazine - September/October 2017 - 41
Asphalt Pavement Magazine - September/October 2017 - 42
Asphalt Pavement Magazine - September/October 2017 - 43
Asphalt Pavement Magazine - September/October 2017 - 44
Asphalt Pavement Magazine - September/October 2017 - Tools for the Trade
Asphalt Pavement Magazine - September/October 2017 - 46
Asphalt Pavement Magazine - September/October 2017 - 47
Asphalt Pavement Magazine - September/October 2017 - 48
Asphalt Pavement Magazine - September/October 2017 - 49
Asphalt Pavement Magazine - September/October 2017 - 50
Asphalt Pavement Magazine - September/October 2017 - 51
Asphalt Pavement Magazine - September/October 2017 - 52
Asphalt Pavement Magazine - September/October 2017 - Industry Calendar
Asphalt Pavement Magazine - September/October 2017 - 54
Asphalt Pavement Magazine - September/October 2017 - Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - September/October 2017 - 56
Asphalt Pavement Magazine - September/October 2017 - 57
Asphalt Pavement Magazine - September/October 2017 - 58
Asphalt Pavement Magazine - September/October 2017 - cover3
Asphalt Pavement Magazine - September/October 2017 - cover4
Asphalt Pavement Magazine - September/October 2017 - outsert1
Asphalt Pavement Magazine - September/October 2017 - outsert2
Asphalt Pavement Magazine - September/October 2017 - BG1
Asphalt Pavement Magazine - September/October 2017 - BG2
Asphalt Pavement Magazine - September/October 2017 - BG3
Asphalt Pavement Magazine - September/October 2017 - BG4
Asphalt Pavement Magazine - September/October 2017 - BG5
Asphalt Pavement Magazine - September/October 2017 - BG6
Asphalt Pavement Magazine - September/October 2017 - BG7
Asphalt Pavement Magazine - September/October 2017 - BG8
Asphalt Pavement Magazine - September/October 2017 - BG9
Asphalt Pavement Magazine - September/October 2017 - BG10
Asphalt Pavement Magazine - September/October 2017 - BG11
Asphalt Pavement Magazine - September/October 2017 - BG12
Asphalt Pavement Magazine - September/October 2017 - BG13
Asphalt Pavement Magazine - September/October 2017 - BG14
Asphalt Pavement Magazine - September/October 2017 - BG15
Asphalt Pavement Magazine - September/October 2017 - BG16
Asphalt Pavement Magazine - September/October 2017 - BG17
Asphalt Pavement Magazine - September/October 2017 - BG18
Asphalt Pavement Magazine - September/October 2017 - BG19
Asphalt Pavement Magazine - September/October 2017 - BG20
Asphalt Pavement Magazine - September/October 2017 - BG21
Asphalt Pavement Magazine - September/October 2017 - BG22
Asphalt Pavement Magazine - September/October 2017 - BG23
Asphalt Pavement Magazine - September/October 2017 - BG24
Asphalt Pavement Magazine - September/October 2017 - BG25
Asphalt Pavement Magazine - September/October 2017 - BG26
Asphalt Pavement Magazine - September/October 2017 - BG27
Asphalt Pavement Magazine - September/October 2017 - BG28
Asphalt Pavement Magazine - September/October 2017 - BG29
Asphalt Pavement Magazine - September/October 2017 - BG30
Asphalt Pavement Magazine - September/October 2017 - BG31
Asphalt Pavement Magazine - September/October 2017 - BG32
Asphalt Pavement Magazine - September/October 2017 - BG33
Asphalt Pavement Magazine - September/October 2017 - BG34
Asphalt Pavement Magazine - September/October 2017 - BG35
Asphalt Pavement Magazine - September/October 2017 - BG36
Asphalt Pavement Magazine - September/October 2017 - BG37
Asphalt Pavement Magazine - September/October 2017 - BG38
Asphalt Pavement Magazine - September/October 2017 - BG39
Asphalt Pavement Magazine - September/October 2017 - BG40
https://www.nxtbook.com/naylor/NAPS/NAPS0318
https://www.nxtbook.com/naylor/NAPS/NAPG0018
https://www.nxtbook.com/naylor/NAPS/NAPS0218
https://www.nxtbook.com/naylor/NAPS/NAPS0118
https://www.nxtbook.com/naylor/NAPS/NAPS0617
https://www.nxtbook.com/naylor/NAPS/NAPS0517
https://www.nxtbook.com/naylor/NAPS/NAPS0417
https://www.nxtbook.com/naylor/NAPS/NAPS0317
https://www.nxtbook.com/naylor/NAPS/NAPS0217
https://www.nxtbook.com/naylor/NAPS/NAPS0117
https://www.nxtbook.com/naylor/NAPS/NAPS0616
https://www.nxtbook.com/naylor/NAPS/NAPS0516
https://www.nxtbook.com/naylor/NAPS/NAPS0416
https://www.nxtbook.com/naylor/NAPS/NAPS0316
https://www.nxtbook.com/naylor/NAPS/NAPG0016
https://www.nxtbook.com/naylor/NAPS/NAPS0216
https://www.nxtbook.com/naylor/NAPS/NAPS0116
https://www.nxtbook.com/naylor/NAPS/NAPS0615
https://www.nxtbook.com/naylor/NAPS/NAPS0515
https://www.nxtbook.com/naylor/NAPS/NAPS0415
https://www.nxtbook.com/naylor/NAPS/NAPS0315
https://www.nxtbook.com/naylor/NAPS/NAPG0015
https://www.nxtbook.com/naylor/NAPS/NAPS0215
https://www.nxtbook.com/naylor/NAPS/NAPS0115
https://www.nxtbookmedia.com