Megan Hart | University of Missouri-Kansas City

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Concrete specimens were cyclically impacted by AFFF using 1 dimensional absorption analysis in order to understand where and how PFAS entered concrete. Several samples were broken an analyzed for concentration of PFAS after repeated exposures. PFAS concentrations were highested on the submerged side, with the longest chains associated with that side, shorter chains migrated up the cube to the unsubmerged side. Sulfur became soluble and monosulfate reverted to ettringite so that the unexposed top became devoid of sulfur bearing materials, while the bottom had concentrations of newly formed ettringite replacing monosulfate. This sulfate attack is also noted in a decrease in strength. Also apparent is that carbonation is occurring during repeated exposure which means aging of concrete will be accelerated.

Co-presenters

Yaren Karatas
University of Missouri Kansas City

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