indo-us workshop on highway and airport pavement engineering (hipave) v2

8/9/2019 Indo-US Workshop on Highway and Airport Pavement Engineering (HiPAVE) v2

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Advances in asphalt mix

evaluation

Con Sinadinos, CEO

IPC Global, Australia


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The greatest advances in asphalt mix evaluationhave come from the USA

Strategic Highways Research Program (SHRP)

Superpave Design System:

Superior Performing Asphalt Pavements

Mechanistic-Empirical Design Guide

Advances in asphalt mix

evaluation


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Pre SHRP

Binder Specifications

Aggregate Specifications

Volumetric Design

Moisture Sensitivity

Simple Test

Marshall StabilityHveen Stability


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Strategic Highways Research

Program (SHRP)

Meant to be based upon fundamental

material characterization tests

Ran into technical problems relating to thepredictive model

Technical problems relating to the predictivemodel for rutting and fatigue cracking resultedin the abandonment of this approach byFederal Highways Administration (FHWA)


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SHRP Mixture

Tests

Shear Test AASHTO TP7Modulus

Permanent Deformation

Flexural Fatigue AASHTO TP8

Fatigue Cracking

Indirect Tensile Test AASHTO TP9

Thermal Cracking


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Issues With SHRP

Products

High Costs

Equipment

Training Performance Models

Errors

Not Calibrated

Not User Friendly

Change The Way We Do Business

Engineer Mixtures to Perform


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Superpave Design System

The final product of the SHRP asphalt programarea was the Superpave System.


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NCHRP

SuperpaveEvolution..

Superpave Design System


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Steps of Superpave Mix

Design

1. Materials Selection 2. Design Aggregate Structure

3. Design Binder Content 4. Mixture Performance Testing


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National Cooperative

Highway Research Program

(NCHRP) Reports

9-19: Superpave Support and PerformanceModels

9-29: Simple Performance Tester for Superpave

Mix Design 9-33: Mix Design Manual for Hot Mix Asphalt


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NCHRP Project 9-19

RecommendTest(s)

DevelopProtocol(s)

Develop Criteria

Validate Criteria


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Project 9-19 Correlation Study

MnRoad

WesTrack FHWA-ALF


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Dynamic Modulus Test

0

0*

E

Stress

Strain

Time

RuttingMin |E*| at High Temp

Fatigue CrackingMax |E*| at Intermediate Temp


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Static Creep Test

Flow Time

TIME

RuttingMin FT at High Temp


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Repeated Load Creep Test

Flow Number

RuttingMin FN at High Temp

TIME


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Sample preparation

17

0mm

150mm

150mm

100mm


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NCHRP Project 9-29

Equipment Specs

Procure PrototypeEquipment

Evaluate Prototype

Equipment Revise Specs


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Project 9-29 Equipment

Specifications

Simple Performance Test SystemStatic Creep / Flow Time TestRepeated Load / Flow Number Test

Dynamic Modulus

Test Automated Specimen FabricationEquipment


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Project 9-29 Specification

Development

Draft Equipment SpecsCost Estimate

Manufacturers Review

Prototype EquipmentSpecsRevised Estimate

Users Workshop

Ideas

Research TestProtocols


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Project 9-29 Prototype SimplePerformance Test Procurement

EnduraTec

Instron

Interlaken

IPC Global

Specifications

Advantages Cost Past Performance


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Project 9-29 Prototype Simple

Performance Test Systems

Tests

Flow TimeFlow Number

Dynamic Modulus

Temperature Range20 to 60C (now 4 to 60C)

Confining Pressure Range0 to 210 kPa


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Project 9-29 Prototype Simple

Performance Test Systems

IPC Global

Interlaken


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Final report January 2010 (AAT)

Test procedures for dense, gap, and open-graded mixes

HMA performance tests

Criteria developed with M-E Design Guide Final critical issues being evaluated:

FAA values and CAA values

Flat & elongated requirements

Performance Tests

Design VMA values Design gyration levels

RAP

Project 9-33 Mix Design

Manual for HMA


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AMPT Uses

Dynamic Modulus Master Curve forStructural DesignAASHTO MEPDG

Mixture DesignNCHRP Project 9-33 Mix Design Manual for

Hot Mix Asphalt

Material EvaluationsHomogenity of RAP Mixtures


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Pavement Structural Design

AASHTO Mechanistic-Empirical PavementDesign GuideHMA Characterized by a Dynamic Modulus

Master CurvePlant Aged Conditions

Modulus Needed

Stress-Strain Analysis

Rutting Model

Fatigue Cracking Model


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Temperature and LoadingRate Effects

1

10

100

1000

10000

0.0001 0.001 0.01 0.1 1 10 100 1000

Reduced Frequency, Hz

DynamicModulus,

ksi

4 C

20 C

40 C

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

0 5 10 1 5 20 25 3 0 35 4 0 45

Temperature, C

ShiftFactor


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NCHRP 9-29 Draft Practice

Developing Dynamic Modulus MasterCurves for Hot-Mix Asphalt ConcreteUsing the Asphalt Mixture Performance

TesterTesting Conditions

Temperature

Frequency

Replicates

Data Analysis

Excel Spreadsheet


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Rutting Resistance

2-3 in

Shear Deformation - Major

Densification - Minor

High Temperatures

Early in Pavement Life


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0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0 1000 2000 3000 4000 5000 6000

Load Cycle

PermanentStrain,

%

0.0000

0.0005

0.0010

0.0015

0.0020

0.0025

0.0030

0.0035

0.0040

0.0045

0.0050

P

ermanentStrainRate,%

perCycle

Permanent Strain Permanent Strain Rate

Flow Number = Minimum

Permanent Strain Rate

Repeated Load Test


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AMPT

Flow Number (Fn)

Developed as indicator of rutting potential

9-33 relationship flow number/maximumtraffic with lab mixes (field mix issue-age)

Issues High temperature 50% reliability PG

LTPPBind 3.1

Confined/unconfined Load: various levels have been used


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IDT for E* Determination

FHWA Sponsored - NCState

Procedure RuggednessTesting

ETG review underway


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Implementation

Pooled fund purchase and deliver AMPT forhighway Agencies

Initially 9 units with option for 29 more

Provide training to use AMPT to performproposed standard practices for measuringdynamic modulus and flow number

2 Day Training Course

Evaluate nationwide implementation and useof AMPT for assessing performance over awide range of climatic conditions, materials,and structures.


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Pooled Fund Progress

FHWA, eighteen states, and the Ministry ofTransportation in Ontario, Canada havecommitted over $1.8 million to participate in this

study AMPT Equipment will be delivered to study

participants in 2010

Continuum Damage Fatigue software andhardware is available from IPC

still in research stage


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Pooled fund participants


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AMPT (2009/2010)

Develop pooled fund for training and equipmentpurchase of the equipment

Technician training for operation of theequipment (AAT contractor/NCAT Lab)

Remaining issue withdetermination Flow Number, Fn


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AMPT Uses

Dynamic Modulus Master Curve for StructuralDesign

AASHTO MEDG

Mixture DesignNCHRP Project 9-33 Mix Design Manual for Hot

Mix Asphalt

Material Evaluations

Modified Binders

Forensics

Etc


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AMPT Summary

Specifically for HMA Testing Three Performance Related Tests

Dynamic Modulus

Repeated Load

Creep

User Friendly, Second Generation MixturePerformance Testing Equipment

Available from at least two manufacturers Extensive National Efforts to Develop and

Implement

A k l d t


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Acknowledgements

Advanced Asphalt Technologies, LLC

Engineer ing Ser vices for the A sphal t Indust r y

Development andApplication of the Asphalt

Mix Performance Tester

Ramon Bonaquist, Ph.D., P.E

Advanced Asphalt Technologies, LLC

Field Engineer

Learning & Development SeminarDallas, TX -- April 19-23, 2010

CONSTRUCTION & PROJECT MANAGEMENT DESIGN GENERALIST PAVEMENT & MATERIALS

The Future of the SuperpaveMixture Design System

Asphalt Mix Part IIJohn Bukowski

Asphalt Team Leader

DEVELOPMENT OF A FUNDAMENTALLY BASEDDEVELOPMENT OF A FUNDAMENTALLY BASED

SIMPLE PERFORMANCE TEST(S) TO SUPPORTSIMPLE PERFORMANCE TEST(S) TO SUPPORT

THE SUPERPAVE VOLUMETRIC MIX DESIGNTHE SUPERPAVE VOLUMETRIC MIX DESIGN

PROCESSPROCESS

Dr.M.W.WitczakDr.M.W.Witczak

Professor, ASUProfessor, ASU

TASK CTASK C

Superpave Models ProjectSuperpave Models Project

NCHRP 9NCHRP 9--1919


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Questions?

indo-us workshop on highway and airport pavement engineering (hipave) v2

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