par Wang, Qinjian ;Snoeck, Didier
Référence Construction & building materials, 538, page (147343)
Publication A Paraître, 2026-09-05
Article révisé par les pairs
Résumé : Traditional solutions rely on added modifiers to enhance the long-term durability of sulfur concrete to prevent thermal cracking during service, which limits its application. This study investigates for the first time a novel and innovative approach to microwave-induced healing Sulfur Mortar (SM) by incorporating a microwave-sensitive carbon-based additive: Graphite. The effects of graphite on sulfur-based mortars' mechanical performance, microstructure, and microwave healing behaviour are evaluated. The addition of 3 wt% by sand of graphite enhanced compressive strength by 4% and reduced porosity by 34%. Under 850 W, 2.45 GHz microwave exposure, graphite-enabled mortars showed moderate speed and more uniform heating. An addition of 5 wt% by sand of graphite achieved the best initial healing (95%) and exhibited mass loss of 29% and a 38% drop in healing index (HI) after five cycles, indicating reduced durability, while 3 wt% by sand showed a 20% mass loss and stable HI of 47–66% across all cycles. Overall, this study presents a first investigation of microwave healing on sulfur mortar modified with carbon-based materials, revealing the potential of its repeated healing and circularity. It sheds light on a novel approach using microwave-triggered healing that deals with the cracking issues of sulfur mortar.

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