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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. Further 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 particularly 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.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5];  [6];  [7];  [2];  [8];  [9];  [10];  [2];  [2];  [11];  [12];  [13];  [2]
  1. Geosyntec Consultants, Kennesaw, GA (United States)
  2. King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia)
  3. Univ. of Chile, Santiago (Chile)
  4. Sunchon National Univ. (Korea, Republic of)
  5. Georgia Inst. of Technology, Atlanta, GA (United States)
  6. Texas A & M Univ., College Station, TX (United States)
  7. Univ. of Nebraska, Lincoln, NE (United States)
  8. Strategic Decisions Group, London (United Kingdom)
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  10. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  11. Black & Veatch, Downers Grove, IL (United States)
  12. Univ. of Washington, Seattle, WA (United States)
  13. China Univ. of Geosciences, Wuhan (China)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1532665
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geotechnical and Geoenvironmental Engineering
Additional Journal Information:
Journal Volume: 145; Journal Issue: 3; Journal ID: ISSN 1090-0241
Publisher:
American Society of Civil Engineers
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

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., and Santamarina, J. C. Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash. United States: N. p., 2019. Web. doi:10.1061/(asce)gt.1943-5606.0001986.
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, J. C. Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash. United States. doi:10.1061/(asce)gt.1943-5606.0001986.
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., and Santamarina, J. C. Thu . "Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash". United States. doi:10.1061/(asce)gt.1943-5606.0001986.
@article{osti_1532665,
title = {Characterization and Engineering Properties of Dry and Ponded Class-F Fly Ash},
author = {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.},
abstractNote = {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. Further 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 particularly 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.},
doi = {10.1061/(asce)gt.1943-5606.0001986},
journal = {Journal of Geotechnical and Geoenvironmental Engineering},
number = 3,
volume = 145,
place = {United States},
year = {2019},
month = {1}
}

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