Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Fathi_Ariya_thesis_May 2018.pdf (1.76 MB)

ETD Abstract Container

Abstract Header

Barium Solidification/Stabilization of Legacy Fly Ash

Fathi, Ariya Reza
http://rave.ohiolink.edu/etdc/view?acc_num=akron1523014706886586

Abstract Details

2018, Master of Science in Engineering, University of Akron, Civil Engineering.
A legacy fly ash pile in Ashtabula county has 20,000 – 30,000 cubic yards of material and contains barium and other various heavy metals. The concentrations of barium in the fly ash are below Regional Screening Levels (RSLs) for soil, but if the barium leached out it would pose a threat to human health. Solidification/Stabilization (S/S) of the ash was investigated with concrete and sulfate. After physical/chemical characterization, the fly ash was identified as class F fly ash, meaning it has no self-stabilizing/cementing characteristics, and had barium concentrations ranging from 0-1,500 mg/kg. Fly ash was used as a replacement for either cement or fine aggregate at 10-50%. Cement replacement did not achieve a compressive strength above 3,000 psi when using a 6,500 psi concrete mixture when cement to waste ratios exceeded 20% replacement. When fine aggregate replacement was investigated, fine aggregate to waste ratios up to 40% was effective at achieving above 3,000 psi concrete. X-ray diffraction (XRD) revealed the barium present was already in the insoluble barium sulfate form. Therefore, the Toxicity Characteristic Leaching Procedure (TCLP) and accelerated leaching procedure were used to access the potential for barium to leach form the ash and from the concrete mixtures. Barium concentrations never exceeded the U.S. EPA drinking water maximum contaminated level (MCL) for 2 mg/L. Concrete made with ash spiked with 1,500 mg/kg had increased barium leached but still below the primary drinking standard with the highest concentration being 1.79 ± 0.44 mg/L. Therefore, the ash can be handled as solid waste if no beneficial use can be identified.
Stephen Duirk (Advisor)
Christopher Miller (Committee Member)
David Roke (Committee Member)
88 p.
Environmental Engineering

Recommended Citations

Citations

  • Fathi, A. R. (2018). Barium Solidification/Stabilization of Legacy Fly Ash [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523014706886586

    APA Style (7th edition)

  • Fathi, Ariya. Barium Solidification/Stabilization of Legacy Fly Ash. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1523014706886586.

    MLA Style (8th edition)

  • Fathi, Ariya. "Barium Solidification/Stabilization of Legacy Fly Ash." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523014706886586

    Chicago Manual of Style (17th edition)

akron1523014706886586
270
© 2018, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.