Evaluation of I-FIT results and machine variability using MnRoad test track mixtures.

Ozer, Hasan; Al-Qadi, Imad L.; Barber, Edoardo; Okte, Egemen; Zhu, Zehui; Wu, Shenghua; Illinois Center for Transportation; University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering

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Evaluation of I-FIT results and machine variability using MnRoad test track mixtures.

2017-06-01
By Ozer, Hasan ; Al-Qadi, Imad L. ; Barber, Edoardo ; ...

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English

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Alternative Title:

A report of the findings of ICT Project R27-SP31 : evaluation of I-FIT results and machine variability using MnRoad test track mixtures.
Creators:

Ozer, Hasan ; Al-Qadi, Imad L. ; Barber, Edoardo ; Okte, Egemen ; Zhu, Zehui ; ... More +

Ozer, Hasan ; Al-Qadi, Imad L. ; Barber, Edoardo ; Okte, Egemen ; Zhu, Zehui ; Wu, Shenghua Less -
Corporate Creators:

Illinois Center for Transportation ; University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering

Illinois Center for Transportation ; University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering Less -
Corporate Contributors:

Illinois. Department of Transportation. Bureau of Materials and Physical Research ; United States. Federal Highway Administration

Illinois. Department of Transportation. Bureau of Materials and Physical Research ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Asphalt Mixtures Cracking Fracture Fracture Tests Illinois Flexibility Index (I-FIT) Machines Materials And Structures Protection
Publication/ Report Number:

FHWA-ICT-17-012 ; ICT-17-016 ; UIUL 2017-2016

FHWA-ICT-17-012 ; ICT-17-016 ; UIUL 2017-2016 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final report: 8/16/16 - 6/30/17
Corporate Publisher:

Illinois Center for Transportation
Abstract:

The Illinois Flexibility Index Test (I-FIT) was developed to distinguish between different mixtures in terms of potential cracking. Several

machines were manufactured and are currently available to perform the I-FIT. This report presents the results and findings from an

experimental program developed to compare various I-FIT configurations. Three different I-FIT devices were compared in collaboration with

Illinois Department of Transportation (IDOT). The main focus of the study was the comparison of the two custom designs: an InstroTek screw-driven

device with a spring rollers support system and a TestQuip servo-hydraulic system with both spring and bearing rollers support systems.

In addition, the Interlaken 100 kN servo-hydraulic universal testing frame equipped with an I-FIT fixture with spring roller support system was

also evaluated. In total, eight asphalt concrete (AC) mixtures with varying design characteristics were analyzed by evaluating the difference in

the mean values of fracture energy, slope, and overall patterns of load-displacement curves in addition to the statistical analysis. According to

the results obtained, the various machines did not significantly affect the flexibility index (FI) calculated for each mixture in this study. In all

cases, the results were within approximately one unit of FI for each machine and mixture. Statistical analysis conducted using the ANOVA

analysis and t-test also supported the conclusion that the device configurations were found to have no significant effect on the FI results for the

AC mixtures evaluated in this study, regardless of the loading system (hydraulic or screw-driven) and the configuration of the support system

(spring or bearing rollers).
Format:

PDF
Funding:

R27-SP31
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:6c78b9f793a7f8dcc1a27ed8da2acd3a794de2ead2d39b519627132b876f2f62
Download URL:

https://rosap.ntl.bts.gov/view/dot/32459/dot_32459_DS1.pdf
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Evaluation of I-FIT results and machine variability using MnRoad test track mixtures.

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