Adhesive Performance of Slag-Based Geopolymer Paste for Repair Applications
Volume Title: ICASGE2025
Paper ID : 1006-ICASGE-FULL
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Abstract
This study investigated the potential of using geopolymer paste (GP) as an adhesive for repairing limestone and granite masonry blocks, which are commonly found in historic buildings. Seven GP mixes were developed, incorporating various combinations of binder materials—slag, silica fume, and metakaolin—while completely omitting cement. The research involved a thorough comparison of the mechanical properties, adhesive performance, and production costs of these GP mixes against a commercially available epoxy adhesive mortar (EAM). Results showed that the GP mixes performed exceptionally well in repairing limestone and granite blocks, particularly when modified with metakaolin or silica fume. These specific combinations exhibited adhesive properties comparable to those of the EAM, while also being significantly more cost-effective. Notably, the GP mixes not only enhanced the structural integrity of the repairs but also contributed to sustainability by utilizing waste materials. Overall, these findings highlight the promising potential of geopolymer paste as a sustainable and economical adhesive solution for the restoration of historic masonry structures, paving the way for more environmentally friendly practices in heritage conservation and restoration.
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