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Dedolomitization and Alkali-Silica Reactions in Ohio-Sourced Dolostone Aggregates

Smeltz, Jonathan Brett
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522982074568612

Abstract Details

2018, Master of Science (MS), Bowling Green State University, Geology.
Alkali-aggregate reactions (AAR), including alkali-carbonate reactions (ACR) and alkali-silica reactions (ASR), may be a cause of premature degradation of concrete. Conventional ASTM testing suggested that some NW Ohio sourced dolostone aggregates were susceptible to AAR. However, these tests do not provide direct evidence of AAR and may take up to a year to perform. Therefore, this study was performed using modern analytical techniques to investigate AAR susceptibility of crushed dolostone sources through dolomite crystal texture analysis, evaluation of impurities, etc., as well as to directly detect AAR-type byproducts in concrete. PLM, insoluble residue testing, XRD, XRF, ICP-OES, and SEM/EDS analyses were conducted on aggregate and concrete samples. The results of these analyses suggest that there was a definitive relationship between dolomite formation conditions and ASR susceptibility but the relationship with dedolomitization was less straightforward. Impure, fine-grained dolostone aggregates with planar textures may be more prone to ASR and associated expansion. These aggregates contain greater concentrations of silica, which are proportional to concentrations of dissolved silicon in highly alkaline environments. In the concrete samples, the presence of reaction rims and carbonate haloes containing calcite and brucite indicated dedolomitization occurred in all samples, even at 28 days, due to the highly alkaline concrete pore solutions. However, the conspicuous presence of dedolomitization was not associated with deleterious expansion in the year-long test. ASR, which may be promoted by dedolomitization, is the likely cause of expansion and degradation due to AAR. ASR was not abundantly observed due to the short curing duration of the concrete in addition to the low-alkali cement and the relatively unreactive intercrystalline alpha quartz grains. Future research should focus on the analysis of potentially deleterious sources using modern analytical methods along with routine ASTM tests.
John Farver, PhD (Advisor)
James Evans, PhD (Committee Member)
Yuning Fu, PhD (Committee Member)
769 p.
Geochemistry; Mineralogy; Sedimentary Geology
Dolomite Textures; Concrete; AAR; ASR; ACR; Alkali-Aggregate Reactions; Dedolomitization; Alkali-Silica Reactions; Alkali-Carbonate Reactions; Industrial Mineralogy; Mineralogy; Geochemistry; Sedimentary Geology; Geology; Ohio Geology

Recommended Citations

Citations

  • Smeltz, J. B. (2018). Dedolomitization and Alkali-Silica Reactions in Ohio-Sourced Dolostone Aggregates [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522982074568612

    APA Style (7th edition)

  • Smeltz, Jonathan. Dedolomitization and Alkali-Silica Reactions in Ohio-Sourced Dolostone Aggregates . 2018. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522982074568612.

    MLA Style (8th edition)

  • Smeltz, Jonathan. "Dedolomitization and Alkali-Silica Reactions in Ohio-Sourced Dolostone Aggregates ." Master's thesis, Bowling Green State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522982074568612

    Chicago Manual of Style (17th edition)

bgsu1522982074568612
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This open access ETD is published by Bowling Green State University and OhioLINK.