Properties and performance of fly ash-based geopolymer as concrete repair material

• Published in: Recent Developments of Geopolymer Materials: Processing and Characterisations
• Main Author: Zailani W.W.A.; Norain M.N.; Apandi N.M.; Tahir M.F.M.; Faris M.A.; Abdullah M.M.A.B.; Razak R.A.; Sinarta I.N.; Agustini N.K.A.
• Format: Book chapter
• Language: English
• Published: Elsevier 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85209006857&doi=10.1016%2fB978-0-443-24068-3.00008-X&partnerID=40&md5=2a2a0471e1b30cc5bd516729fccf6849

Progressive structural damage and condition deterioration of existing infrastructure systems simultaneously enhanced the innovation to develop high-performance repair materials to ensure the sturdiness of the existing structures that relates to public safety. Commercialized cementitious repair materials are mostly dependent on the commercialized cementitious binder such as Portland cement. Alternatively, a geopolymer-based repair binder, also known as alkali-activated material has been studied extensively over the past few years. For instance, the fly ash was incorporated as a main geopolymer’s precursor to innovate types of repair materials. This research proposes geopolymer produced from the activation of fly ash that contains high silica, alumina, calcium, and iron contents in alkaline medium (i.e., sodium hydroxide and sodium silicate solution). The preliminary tests proved that the geopolymer exhibits an excellent physical- and mechanical properties when applied as the repair materials. This chapter provides a comprehensive overview of state-of-the-art research on the geopolymers for repairing deteriorated and damaged concrete structures, at the same time, promotes sustainable structure repair practices. This prominent conservation approach extends the service life of the deteriorated reinforced concrete structures. © 2025 Elsevier Ltd. All rights reserved.