NDT Monitoring of Alkali-Activated Material Carbonation

Abstract:

Production of Portland cement is relatively environmentally demanding (high CO₂ emissions, extraction of raw materials for its production). Alkali-activated materials are an alternative to conventional Portland cement in the production of concrete. For alkali-activated binder concretes, their ability to withstand corrosive environments and their ability to protect steel reinforcement must be assessed. It is also necessary to know the suitability of non-destructive methods for monitoring the degradation process of these concretes. The paper deals with the carbonation monitoring of concrete with alkali-activated binder (slag) by the impact-echo method. Slag activated by sodium hydroxide (NaOH) was used as a binder. The specimens were tested by the non-destructive method (Impact-echo, ultrasound velocity). We focused on the shift of the dominant frequency obtained by the Impact-echo method.

• Periodical: Key Engineering Materials (Volume 868)
• Pages: 45-50
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.868.45
• Online since: October 2020
• Authors: Iveta Plšková*, Michal Matysík, Libor Topolář, Petr Hrubý
• Keywords: Alkali-Activated Systems, Binder, Impact-Echo, NDT, Nondestructive Testing, Portland Cement, Slag, Sodium Hydroxide

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