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Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution

1
Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, ECOT 441 UCB 428, Boulder, CO 80309-0428, USA
2
Materials Science and Engineering Program, University of Colorado Boulder, 4001 Discovery Drive, Room N378 80303, Denver CO 80309-0428, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(12), 2019; https://doi.org/10.3390/ma12122019
Received: 4 June 2019 / Revised: 18 June 2019 / Accepted: 20 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Materials for Durable Concrete Structures)
This work presents experimental evidence that confirms the potential for two specific zeolites, namely chabazite and faujasite (with a cage size ~2–13 Å), to adsorb small amounts of chloride from a synthetic alkali-activated cement (AAC) pore solution. Four synthetic zeolites were first exposed to a chlorinated AAC pore solution, two faujasite zeolites (i.e., FAU, X-13), chabazite (i.e., SSZ-13), and sodium-stabilized mordenite (i.e., Na-Mordenite). The mineralogy and chemical composition were subsequently investigated via X-ray diffraction (XRD) and both energy- and wavelength-dispersive X-ray spectroscopy (WDS), respectively. Upon exposure to a chlorinated AAC pore solution, FAU and SSZ-13 displayed changes to their diffraction patterns (i.e., peak shifting and broadening), characteristic of ion entrapment within zeolitic aluminosilicate frameworks. Elemental mapping with WDS confirmed the presence of small amounts of elemental chlorine. Results indicate that the chloride-bearing capacity of zeolites is likely dependent on both microstructural features (e.g., cage sizes) and chemical composition. View Full-Text
Keywords: alkali-activated cements; zeolite; faujasite; chabazite; chloride adsorption alkali-activated cements; zeolite; faujasite; chabazite; chloride adsorption
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MDPI and ACS Style

Osio-Norgaard, J.; Srubar, W.V., III. Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution. Materials 2019, 12, 2019. https://doi.org/10.3390/ma12122019

AMA Style

Osio-Norgaard J, Srubar WV III. Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution. Materials. 2019; 12(12):2019. https://doi.org/10.3390/ma12122019

Chicago/Turabian Style

Osio-Norgaard, Jorge, and Wil V. Srubar III. 2019. "Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution" Materials 12, no. 12: 2019. https://doi.org/10.3390/ma12122019

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