Autogenous self-healing of cement with expansive minerals-I : Impact in early age crack healing

Qureshi, Tanvir, Kanellopoulos, Antonios and Al-Tabbaa, Abir (2018) Autogenous self-healing of cement with expansive minerals-I : Impact in early age crack healing. Construction and Building Materials, 192. pp. 768-784. ISSN 0950-0618

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This study investigates the impact of expansive minerals, namely magnesium oxide, bentonite clay, and quicklime on the early age autogenous self-healing capacity of Portland cement (PC) paste. Individual mineral dosage in PC was studied comprehensively together with several multiple mineral combinations. The study also covers a brief state of the art on autogenous self-healing and the use of minerals. The healing performance was compared using flexural strength recovery, crack sealing, and permeability tests. Materials microstructural investigations were carried out using XRD, TGA and SEM-EDX. The hydrated and swelling products of expansive minerals have effectively contributed to the production of healing materials. Cracks in the range of 180 µm healed efficiently in a mineral containing mixes within 28 days. Self-healing recovery was triggered through the crack bridging (strength recovery), sealing (physical closer of cracks through crystallisation) and durability performance improvement.

Item Type	Article
Additional information	© Crown copyright 2018. This manuscript is made available under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence (CC BY-NC-ND 4.0). For further details please see: https://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords	bentonite clay, crack bridging, crystallisation, durability improvement, magnesium oxide (mgo), quicklime, strength recovery, civil and structural engineering, building and construction, general materials science
Date Deposited	15 May 2025 13:57
Last Modified	01 Jul 2025 00:03