asphalt pavement structural number

Pavement Design – What’s My Structural Number? - …

Jun 02, 2014 · One of the key questions in the structural design of an asphalt pavement is how thick each layer of the structure should be. During design, these thicknesses are related to the Structural Number (SN), which is an abstract value that expresses the structural strength of the overall pavement.

Structural Number - Pavement Interactive

The Structural Number (SN) represents the overall structural requirement needed to sustain the design’s traffic loadings. It is an abstract number that expresses the structural strength of a pavement required for given combinations of soil support (M R), total traffic expressed in …

Flexible Pavement Structural Number Calculator

L=a1ta + b1tb + c1tsb +d1tad Where, L=Structural Number of Flexible pavement, a1=Layer coefficient for asphalt , ta=Asphalt layer thickness, b1=Layer coefficient of base, tb=Base layer thickness , c1=Layer coefficient of sub-base, tsb=Sub-base layer thickness, d1=Layer coefficient of additional layer, tad=Thickness of additional layer.

Equivalency Chart - Concrete Promotion

pavement that is overlaid with asphalt has a structural coefficient of approximately 0.50. This value has since been often cited in some older design manuals. In reality, this is a conservative value, which can be used to estimate comparable pavement sections. The following table lists layer coefficients for various materials: 2.5 * 0.30 = 0.75

Flexible Pavement Design Structural Number Calculator - Civil

Calculate the flexible pavement structural number given that, a1=Layer coefficient for asphalt = 8. ta=Asphalt layer thickness = 8. b1=Layer coefficient of base = 7. tb=Base layer thickness = 7. c1=Layer coefficient of sub-base = 5. tsb=Sub-base layer thickness = …

Calculate proper pavement thickness with free online tool ...

Nov 10, 2014 · Calculate proper pavement thickness with free online tool

Table of Contents

200. Structural coefficient is the only new parameter. Structural coefficients for ODOT asphalt material specifications are found in Figure 401-1. 402 Structural Number Determination All of the design input information is required prior to determination of design thickness. Structural number (SN) is determined using the nomographs found in Figures 402-2 and 402-3. An example flexible

AASHTO Pavement Thickness Design Guide - CECALC

Normally 50 years for and 30 years for asphalt. b. Design Traffic (ESALs) – ESALs is the estimate of number of Equivalent 18 kip Single Axle Loads (ESALs) during the analysis period is …

Design & Construction of Heavy-Duty Pavements

2 Design & Construction of Heavy-Duty Pavements NATIONAL ASPHALT PAVEMENT ASSOCIATION • QIP 123 Technical Report Documentation Page 1. Report No. Quality Improvement Series QIP-123 2. Report Date August 2019 3. Title and Subtitle Design & Construction of Heavy-Duty Pavements…

Appendix C - NHI-05-037 - Federal Highway Administration

C.1 Introduction

Structural Design - Asphalt Pavement

Structural Design For parking lots where most of the traffic will be passenger vehicles, the structural requirements are not significant. The material thicknesses are determined based on (1) water storage needs for the base aggregates and (2) minimum thickness requirements for the porous asphalt.

Flexible Pavement Structural Number Formula - Civil ...

Flexible Pavement Structural Number formula. civil engineering formulas list online.

Possible Method of Determining Structural Number for ...

The Structural Number (SN) is an index providing an indication of the strength of the pavement layers and of the total pavement structure. This empirical approach is derived by


STRUCTURAL NUMBERS FOR RECLAIMED ASPHALT PAVEMENT BASE AND SUBBASE COURSE MIXES. The objective of this project was to determine how the structural number of a pavement section would be affected by the introduction of Reclaimed Asphalt Pavement (RAP) in the base and subbase aggregate layers.

Overview of Asphalt Concrete Pavement Design

“ is the native soil which really supports the load.” John Loudon McAdam Overview of Asphalt Concrete Pavement Design

Asphalt Pavement Thickness and Mix Design - Asphalt ...

Is the pavement structure (subgrade, subbase, base, and all asphalt layers) adequate to support the loads? You need to purchase our MS-23 Manual, Thickness Design of Asphalt Pavements for Heavy Wheel Loads. Is the hot mix asphalt surface stiff enough to resist deformation (ruts or indentations)?


Page 5 Reliability Design reliability is defined as the probability that a pavement section will perform satisfactorily over the design period.

Asphalt Versus Concrete — Which Is Stronger?

Mar 01, 2006 · A dense-graded asphalt pavement is assigned a Structural Number of 3.0 or three times as strong per inch of thickness as the graded aggregate base. For example, a three-inch asphalt base could be substituted for a nine-inch aggregate base and provide the same support for the traffic.

Chapter Fifty-four PAVEMENT DESIGN

54-6.05 Composite Pavement Structural Number ..... 54-6.2 54-6.06 Thickness Design Equations ................................................................. 54-6.5 54-6.07 Minimum Design Requirements ............................................................ 54-6.6


2 SUPERPAVE Superpave is a state of the art paving system which our industry and the state of Maryland embraced in the late 1990’s. Marshall mixes are no longer readily available and should be replaced with the appropri-

Flexible Pavement Design EXCEL Calculator ...

Please note that the structural coefficient of the base layer (0.34) is a function of its position within the pavement structure and not necessarily material properties. It was derived from empirical relationships at the AASHTO Road Test and therefore a hot-mix-asphalt base should be considered at 0.34 per inch and not 0.44 per inch.



Chapter 18 - 98042 - Recycling - Sustainability ...

effective structural number of the existing pavement at the time the overlay is placed Structural number (SN) is defined as follows: SN = a 1 D 1 + a 2 D 2 m 2 + a 3 D 3 m 3

Pavement Thickness Design

Flexible Pavement Point Loading Rigid Pavement Point Loading c. Reliability [R (%)]: Reliability is the probability that the design will succeed for the life of the pavement.


Existing pavement buildup and condition: 3” asphalt surface with greater than 10% having low severity alligator cracking 8” granular base having some evidence of pumping and degradation Drainage quality of exiting pavement is poor.Percent of time pavement structure is exposed to moisture levels

Facilities Development Manual Wisconsin Department of ...

The spacing of transverse contraction joints for rural WisDOT pavements is uniform at 15 feet. For urban pavements, the spacings are as follows: - 12 feet for pavement thicknesses of 6 and 6-1/2 inches - 14 feet for pavement thicknesses of 7 and 7-1/2 inches

» Structural Design Methods

Empirical Design – Secondary and Sub-Division Roads


The objective of this project was to determine how the structural number of a pavement section would be affected by the introduction of Reclaimed Asphalt Pavement (RAP) in the base and subbase aggregate layers. Nine RAP/aggregate mixtures were tested: 100% RAP, and base and subbase RAP/aggregate mixtures containing 0, 10, 30, and 50% RAP.

Asphalt QMS Manual - 03 Asphalt Pavement Design

The structural number is an index number derived from an analysis of traffic, soil conditions, and regional factors. This number is used to determine the thickness of the total pavement and the thickness of the various layers. The following is a relative comparison of strength of various asphalt mix layers to each other and to other base types:

Structural Numbers - Civil Engineering

In the AASHTO design method, the structural number is defined by. SN= SN 1 +SN 2 +SN 3. where SN 1 structural number for the surface course=a 1 D 1. a 1 = layer coefficient for the surface course D 1 =actual thickness of the surface course, in (mm)

Assessment of the 1993 AASHTO Structural Number as a …

Assessment of the 1993 AASHTO Structural Number as a Tool for Performance Evaluation of Asphalt Pavements Using Falling Weight Deflectometer Data from LTPP ... One of the most significant breakthroughs of the 1993 design guide was the introduction of the concept of structural number (SN). This study investigates the capability of 1993 AASHTO SN ...

MKAQ 1053 / SKAA 4813

Design charts • Design charts were developed based • Temperature – 3 Regions • New York: 45˚F • North Carolina: 60˚F • Arizona: 75˚F

AASHTO Flexible Design Procedure

Topic 7 –AASHTO Flexible Pavement Design 1.3.3 Definition of Structural Number BASE AC SUB-BASE D1 D2 D3 Structural Coefficient (a): a = fnc ( a1 a2 a3 Basic Procedure:

Asphalt Treated Base (ATB) | Washington Asphalt Pavement ...

Asphalt treated base (ATB) is a dense-graded HMA with a wide gradation band and lower asphalt content intended for use as a stabilizing base course.


Developing Specifications for Using Recycled Asphalt Pavement as Base, Subbase or General Fill Materials, Phase II , is a complete, comprehensive report(11). Florida uses a stiffness


Pavement Design Manual September 29, 2017 Page 12 Once the is determined from the above equation, pavement layer thicknesses are established such that: ≤ 1 1 + 2 2I2 + 3 3I3. Where: 𝑖. = i. th layer coefficient, 𝑖 th= i layer thickness (inches) and I𝑖 th= i layer drainage coefficient.

Types of Pavements - Flexible Pavement vs Rigid Pavement

Critical condition of stress in the rigid pavement is the maximum flexural stress occurring in the slab due to wheel load and the temperature changes.


46-4.02(h) Existing Structural Number ..... 46-4(5) 46-4.02(i) Overlay Thickness Design ............................................. 46-4(5 ) 46-4.02(j) Minimum Thickness and …

Models for Predicting Pavement Deterioration

Models for Predicting Pavement Deterioration K. P. GEORGE, A. s. RAJAGOPAL, AND L. K. LIM The measurement and prediction of pavement performance is a critical element of any pavement management system (PMS). Pavement condition rating (PCR), a composite statistic derived from functional and structural conditions, is used as a measure

Chapter 5 Parking Lot Design - APAI

Chapter 5 Parking Lot Design GENERAL CONSIDERATIONS The parking lot is the first - and the last - part of a building complex to be viewed by the user.

PDDM Chapter 11 - Pavements

Section1.1.1 for definitions of policy, standards, criteria and guidance. The intent of this chapter is to present the above information in a concise and clear manner.

Structural Design of Asphalt Pavements: Principles and ...

Jul 21, 2015 · Thus, from Fig. 2, the pavement structure 1 should be designed for an allowable strain of ‘q’ if a distress level of ‘p’ is defined as the structural failure level of a specific type of distress considered in the design.It is interesting to note that, in pavement design problems, the allowable strain (generally) is a function of number of load repetitions, for the various types of ...

AsphAlt pAvement AlliAnce • im-40

Perpetual Pavement is “an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction,

Flexible Overlay Pavement Design Example 1993 …

Design Structural Number Calculation, SNf: = 6.30 Step 7: Determining effective structural number of existing pavement, (SNeff) From FWD 3 SN ef= 0.0045*Dfp*E= 5.76 D= Total thickness of all pavement layers of existing pavement above the subgrade, inch Ep= Effective combined modulus of all pavement layers above the subgrade, psi From condition estimate

Table of Contents

05-299 (7-08) PUBLICATION: TRANSMITIAL LETIER Publication 242 ~ May 2015 Edition pennsylvania DATE: DE PARTMENT OF TRANSPORTATION January 14, 2016 SUBJECT: Change No. 1 Pavement …

FAQ for Designers | Interlocking Concrete Pavement Institute

Paver and bedding sand are considered as a single layer whose structural number is 0.44 per inch or 1.82 for 80 mm thick pavers and 25 mm of bedding sand. This structural contribution is equivalent to …

IAPA :: Bike, Pedestrian, and Golf Cart Paths - il-asphalt

In an area with reasonably good soil (R-value > 20), occasional maintenance vehicle use, and good drainage, a required structural number of approximately 1.6 is determined from design nomographs. To determine the necessary thickness of hot mix asphalt, divide this structural number by the strength coefficient of the material.

Structural Design Guidelines for Porous Asphalt Pavements ...

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Solved: Pavement The Required Structural Number SN Of …

Answer to Pavement The required structural number SN of an asphalt pavement to protect the roadbed soil is 3.5. The required struc...


asphalt structural coefficient (a1) is used to determine the structural number (SN), which appears in both the actual and predicted ESAL equations, â 1 may be iteratively adjusted to

Materials Lab - Pavement Design | WSDOT

The Falling Weight Deflectometer (FWD) is a non-destructive testing device used to complete structural testing for pavement rehabilitation projects, research, and pavement structure failure detection.

A Simplified Pavement Design Tool - County Engineers …

• The solution represents the pavement thickness for which the . mean value . of traffic which can be carried given the specific inputs. That means there is a 50% chance that the terminal

NAPA Online Store

IS-137E Supplement: Guidance for the Inspection of Aboveground Storage Tanks Containing Asphalt Cement at Asphalt Pavement Production Facilities


The Minnesota Asphalt Pavement Association (MAPA) is an organization of asphalt pavement producers and their associate members. MAPA was formed in 1953 for the purpose of advancing

for Low Volume Roads and Parking Lots

this Asphalt Pavement Design Guide. This publication is designed to provide information of interest ... and number of vehicles that will be using a par-ticular pavement section. In this case there is an employee lot that will primarily see passenger car traffic (Traffic Class 1 or 2). There are load-


Timm, Robbins, Tran & Rodezno iii TABLE OF CONTENTS 1. INTRODUCTION ..... 1

What is ESAL?

What is ESAL? ESAL is the acronym for equivalent single axle load. ESAL is a concept developed from data collected at the American Association of State Highway Officials (AASHO) Road Test to