Density and SCB measured fracture resistance of temperature segregated asphalt mixtures

Density and SCB Measured Fracture Resistance of Temperature Segregated Asphalt Mixtures Accepted Manuscript Density and SCB Measured Fracture Resistance of Temperature Segregated Asphalt Mixtures Mink[.]

Density and SCB Measured Fracture Resistance of Temperature Segregated

Received Date: 18 May 2016

Revised Date: 22 November 2016

Accepted Date: 20 January 2017

Please cite this article as: M Kim, L.N Mohammad, P Phaltane, M.A Elseifi, Density and SCB Measured Fracture

Resistance of Temperature Segregated Asphalt Mixtures, International Journal of Pavement Research and Technology (2017), doi: http://dx.doi.org/10.1016/j.ijprt.2017.01.004

This is a PDF file of an unedited manuscript that has been accepted for publication As a service to our customers

we are providing this early version of the manuscript The manuscript will undergo copyediting, typesetting, andreview of the resulting proof before it is published in its final form Please note that during the production processerrors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain

Temperature Segregated Asphalt Mixtures

Minkyum Kim, Corresponding Author

Research Associate College of Engineering Louisiana Transportation Research Center

Louisiana State University

4101 Gourrier Ave., Baton Rouge, LA 70808

e-mail: mkim@lsu.edu

Louay N Mohammad

Irma Louise Rush Stewart Distinguished Professor Department of Civil and Environmental Engineering Engineering Materials Characterization Research Facility

Louisiana Transportation Research Center

Louisiana State University

4101 Gourrier Ave., Baton Rouge, LA 70808

e-mail: louaym@lsu.edu

Pranjal Phaltane

Graduate Research Assistant Department of Civil and Environmental Engineering

Louisiana State University

4101 Gourrier Ave., Baton Rouge, LA 70808

e-mail: pphalt1@tigers.lsu.edu

Mostafa A Elseifi

Associate Professor Department of Civil and Environmental Engineering

Louisiana State University 3526c Patrick Taylor Hall, Baton Rouge, LA 70803

e-mail: elseifi@lsu.edu

Mixtures

Abstract: Segregation is a serious challenge for high quality constructions of asphalt pavements

Temperature segregation (or temperature differential) in uncompacted asphalt mats has been identified

with the use of infrared thermal cameras at the paving site Four Louisiana asphalt rehabilitation projects

were selected for investigating the effects of temperature segregation on the quality and performance of

asphalt pavements A multi-sensor infrared temperature scanning bar (IR-bar) system mounted behind the

paver measured the real-time thermal profile The quality of paving mats was measured by the density of

field cores while the performance was measured by the mix’s intermediate temperature fracture resistance

using the semi-circular bend (SCB) test Results showed that temperature-segregated samples generally

had lower densities than the control samples, although the differences were mostly statistically

insignificant On the other hand, temperature segregated samples generally had lower fracture resistance

than the control samples measured by the SCB Jc values Four out of six comparison cases showed the

differences were statistically significant Further verification effort was recommended for confident

implementation of the IR thermal imaging technology to the asphalt pavement construction specification

Keywords: temperature segregation, temperature differential, thermal profile, infrared thermal camera,

density, semi-circular bend (SCB), fracture resistance

Haul Time

Paving Time

Target Temperature LA30 A CAT AP655 Shuttle Buggy <10 min Night 149°C

LA1058 B CAT AP1055 Shuttle Buggy 30 min Day 135°C

LA1058 Wearing Course Superpave WMA 12.5 mm PG70-22m 38.0

US165 Wearing Course Superpave HMA 12.5 mm PG70-22m 50.0

LA1053 BC Binder Course Superpave HMA 19.0 mm PG64-22 50.0

0.01.02.03.04.05.06.0

-0.4-0.3-0.2-0.10.00.10.2