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

R. C. Bachus; Marco Terzariol; C. Pasten; S. H. Chong; S. Dai; M. S. Cha; S. Kim; Junbong Jang; E. Papadopoulos; S. Roshankhah; L. Lei; Adrian Garcia; J. Park; A. Sivaram; F. Santamarina; X. Ren; Carlos Santamarina

doi:10.1061/(asce)gt.1943-5606.0001986

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

R. C. Bachus, Marco Terzariol, C. Pasten, S. H. Chong, S. Dai, M. S. Cha, S. Kim, Junbong Jang, E. Papadopoulos, S. Roshankhah, L. Lei, Adrian Garcia, J. Park, A. Sivaram, F. Santamarina, X. Ren, Carlos Santamarina

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29 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	04019003
Journal	Journal of Geotechnical and Geoenvironmental Engineering
Volume	145
Issue number	3
DOIs	https://doi.org/10.1061/(asce)gt.1943-5606.0001986
State	Published - Jan 10 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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.

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10.1061/(asce)gt.1943-5606.0001986

https://repository.kaust.edu.sa/bitstream/10754/630887/1/%28ASCE%29GT.1943-5606.0001986.pdf

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Bachus, R. C., Terzariol, M., Pasten, C., Chong, S. H., Dai, S., Cha, M. S., Kim, S., Jang, J., Papadopoulos, E., Roshankhah, S., Lei, L., Garcia, A., Park, J., Sivaram, A., Santamarina, F., Ren, X., & Santamarina, C. (2019). Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash. Journal of Geotechnical and Geoenvironmental Engineering, 145(3), 04019003. https://doi.org/10.1061/(asce)gt.1943-5606.0001986

@article{46783f8d495d406c870b0581b1bbc023,

title = "Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash",

abstract = "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.",

author = "Bachus, {R. C.} and Marco Terzariol and C. Pasten and Chong, {S. H.} and S. Dai and Cha, {M. S.} and S. Kim and Junbong Jang and E. Papadopoulos and S. Roshankhah and L. Lei and Adrian Garcia and J. Park and A. Sivaram and F. Santamarina and X. Ren and Carlos Santamarina",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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.",

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doi = "10.1061/(asce)gt.1943-5606.0001986",

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Bachus, RC, Terzariol, M, Pasten, C, Chong, SH, Dai, S, Cha, MS, Kim, S, Jang, J, Papadopoulos, E, Roshankhah, S, Lei, L, Garcia, A, Park, J, Sivaram, A, Santamarina, F, Ren, X & Santamarina, C 2019, 'Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash', Journal of Geotechnical and Geoenvironmental Engineering, vol. 145, no. 3, pp. 04019003. https://doi.org/10.1061/(asce)gt.1943-5606.0001986

TY - JOUR

T1 - Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash

AU - Bachus, R. C.

AU - Terzariol, Marco

AU - Pasten, C.

AU - Chong, S. H.

AU - Dai, S.

AU - Cha, M. S.

AU - Kim, S.

AU - Jang, Junbong

AU - Papadopoulos, E.

AU - Roshankhah, S.

AU - Lei, L.

AU - Garcia, Adrian

AU - Park, J.

AU - Sivaram, A.

AU - Santamarina, F.

AU - Ren, X.

AU - Santamarina, Carlos

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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.

PY - 2019/1/10

Y1 - 2019/1/10

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/630887

UR - https://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0001986

U2 - 10.1061/(asce)gt.1943-5606.0001986

DO - 10.1061/(asce)gt.1943-5606.0001986

M3 - Article

SN - 1090-0241

VL - 145

SP - 04019003

JO - Journal of Geotechnical and Geoenvironmental Engineering

JF - Journal of Geotechnical and Geoenvironmental Engineering

IS - 3

ER -

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

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