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Early age hydration behavior of portland cement-based binders incorporating fly ash contaminated with flue gas desulfurization products

Journal Article · · Cement and Concrete Composites
 [1];  [2];  [3]
  1. Oregon State Univ., Corvallis, OR (United States); OSTI
  2. Oregon State Univ., Corvallis, OR (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
Fly ash co-mingled with flue gas desulfurization (FGD) products are currently discarded as off-specification materials based on their high SO3 content. However, previous studies have shown that performance of these fly ashes varies significantly based on FGD product type and as such they may be viable for use in low-CO2 concrete as supplementary cementitious materials (SCMs). In this study, fly ashes with three different types of FGD products including calcium sulfite hemihydrate, calcium sulfate (with some unreacted lime), and sodium sulfate (with some unreacted sodium carbonate) were evaluated. The early age hydration behavior in blended cementitious systems at 20% cement replacement level was studied using Vicat setting time tests, isothermal calorimetry, in-situ quantitative X-ray diffraction, and pore solution analysis. The cause of the setting time retardation and flash setting observed in fly ashes with calcium sulfite hemihydrate and sodium carbonate, respectively, were identified and suitable beneficiation options were suggested for the valorized use of these materials in low-CO2 concrete.
Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001143
OSTI ID:
2422322
Alternate ID(s):
OSTI ID: 1968928
Journal Information:
Cement and Concrete Composites, Journal Name: Cement and Concrete Composites Journal Issue: C Vol. 139; ISSN 0958-9465
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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