Research data supporting "Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete"
University of Cambridge
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Qureshi, T. S., Kanellopoulos, A., & Al-Tabbaa, A. (2016). Research data supporting "Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete" [Dataset]. https://www.repository.cam.ac.uk/handle/1810/254442
This study presents the application of encapsulated expansive powder minerals (magnesium oxide, bentonite and quicklime) for self-healing of cement-based mortars. A system of concentric glass macrocapsules was used to envelope the expansive minerals (outer capsule) and water (inner capsule). Mortar samples containing concentric macrocapsules with different mineral combinations were cracked and healed under three different curing regimes; ambient conditions, high humidity exposure and immersed in water. Self-healing was assessed based on visual crack sealing, mechanical strength recovery and improvement in durability investigated by means of capillary sorption tests. Micro-structural analysis of the healing materials was investigated using FT-IR, XRD and SEM-EDX for exploring self-healing kinetics. Immersed in water yielded the optimum healing efficiency with ~95% crack sealing and ~25% strength recovery in 28 days. Data showed an increasing trend in 56 days for both crack sealing and load recovery. The improvement in terms of capillary absorption of healed samples was also significant after 28 days of healing. Self-healing kinetics revealed that the expansive minerals were hydrated in the initial healing period and slowly carbonated over time until the peripheral crack zone became adequately water tight.
Powder mineral encapsulation, expansion, crack sealing, strength recovery, durability, self-healing kinetics, materials microstructure
Publication Reference: https://doi.org/10.1016/j.conbuildmat.2016.06.030
This work was supported by the EPSRC [grant number EP/K026631/1 IDB. 600014435] and Islamic Development Bank (IDB).
This record's URL: https://www.repository.cam.ac.uk/handle/1810/254442
Attribution-NonCommercial-NoDerivs 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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