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Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash

Bachus, R. C. and Terzariol, M. and Pasten, C. and Chong, S. H. and Dai, S. and Cha, M. S. and Kim, S. and Jang, J. and Papadopoulos, E. and Roshankhah, S. and Lei, L. and Garcia, A. and Park, J. and Sivaram, A. and Santamarina, F. and Ren, X. and Santamarina, J. C. (2019) Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash. Journal of Geotechnical and Geoenvironmental Engineering, 145 (3). Art. No. 04019003. ISSN 1090-0241. doi:10.1061/(asce)gt.1943-5606.0001986.

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Characterization studies conducted on Class-F fly-ash specimens gathered from different producers in the southeastern United States confirm general trends reported for fly ash worldwide. Additional tests and detailed analyses explain the spread in specific gravity (interparticle porosity cenospheres), highlight the tendency to segregation and layering, and show marked ferromagnetism. Furthermore, data show that early diagenetic cementation—within days after wetting—hinders densification and produces a fabric that is prone to collapse. New procedures are specifically developed to diagnose and characterize early diagenesis, including (1) pH measurements as an indicator of diagenetic potential, (2) test protocols to assess early diagenesis using oedometer tests and shear-wave velocity, and (3) procedures to determine realizable unit weights as reference values for the analyses of contractive or dilative tendencies and instability. In the absence of early diagenetic cementation, dilative fly-ash behavior is expected in the upper ≈20  m under monotonic shear loading. Flow instability may follow the failure of the containment structure if the ponded ash is saturated and has experienced hindered densification.

Item Type:Article
Related URLs:
URLURL TypeDescription
Terzariol, M.0000-0001-5362-1968
Roshankhah, S.0000-0002-1160-7882
Additional Information:© 2019 ASCE. This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http:// Received: September 04, 2017; Accepted: June 20, 2018; Published online: January 10, 2019. This research was conducted by the authors at the Georgia Institute of Technology, with funding from the Electric Power Research Institute (EPRI). Additional funding was provided by the KAUST endowment. Gabrielle E. Abelskamp edited the paper.
Funding AgencyGrant Number
Electric Power Research Institute (EPRI)UNSPECIFIED
King Abdullah University of Science and Technology (KAUST)UNSPECIFIED
Subject Keywords:Fabrics, Material failures, Fly ash, Cement, Diagnosis, Porosity, Shear waves, Waste disposal, United States
Issue or Number:3
Record Number:CaltechAUTHORS:20190213-151955242
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92903
Deposited By: Tony Diaz
Deposited On:14 Feb 2019 17:44
Last Modified:16 Nov 2021 16:54

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