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Title:High-volume Fly Ash Concrete for Pavements Findings: Volume 1
Author(s):Baral, Aniruddha; Roesler, Jeffrey R.; Ley, M. Tyler; Kang, Shinhyu; Emerson, Loren; Lloyd, Zane; Boyd, Braden; Cook, Marllon Dan
Subject(s):Concrete
Fly Ash
Hydration
Cementitious Material
Maturity
Setting Time
Limestone
Particle Group
Foam Index
Maturity
Noncontact Ultrasound
Abstract:High-volume fly ash concrete (HVFAC) has improved durability and sustainability properties at a lower cost than conventional concrete, but its early-age properties like strength gain, setting time, and air entrainment can present challenges for application to concrete pavements. This research report helps with the implementation of HVFAC for pavement applications by providing guidelines for HVFAC mix design, testing protocols, and new tools for better quality control of HVFAC properties. Calorimeter tests were performed to evaluate the effects of fly ash sources, cement–fly ash interactions, chemical admixtures, and limestone replacement on the setting times and hydration reaction of HVFAC. To better target the initial air-entraining agent dosage for HVFAC, a calibration curve between air-entraining dosage for achieving 6% air content and fly ash foam index test has been developed. Further, a digital foam index test was developed to make this test more consistent across different labs and operators. For a more rapid prediction of hardened HVFAC properties, such as compressive strength, resistivity, and diffusion coefficient, an oxide-based particle model was developed. An HVFAC field test section was also constructed to demonstrate the implementation of a noncontact ultrasonic device for determining the final set time and ideal time to initiate saw cutting. Additionally, a maturity method was successfully implemented that estimates the in-place compressive strength of HVFAC through wireless thermal sensors. An HVFAC mix design procedure using the tools developed in this project such as the calorimeter test, foam index test, and particle-based model was proposed to assist engineers in implementing HVFAC pavements.
Issue Date:2021-09
Publisher:Illinois Center for Transportation/Illinois Department of Transportation
Citation Info:Baral, Aniruddha, Jeffrey R. Roesler, M. Tyler Ley, Shinhyu Kang, Loren Emerson, Zane Lloyd, Braden Boyd, and Marllon Dan Cook. 2021. High-volume Fly Ash Concrete for Pavements Findings: Volume 1. A report of the findings of ICT-R27-180. Illinois Center for Transportation Series No. 21-030. Research Report No. FHWA-ICT-21-025. Illinois Center for Transportation, Rantoul, IL. https://doi.org/10.36501/0197-9191/21-030
Series/Report:FHWA-ICT-21-025
Genre:Technical Report
Type:Text
Language:English
URI:http://hdl.handle.net/2142/110386
ISSN:0197-9191
DOI:https://doi.org/10.36501/0197-9191/21-030
Sponsor:IDOT-ICT-180
Rights Information:No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.
Date Available in IDEALS:2021-09-09


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