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Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete

Qureshi, Tanvir; Kanellopoulos, Antonis; Al-Tabbaa, Abir

Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete Thumbnail


Authors

Tanvir Qureshi

Antonis Kanellopoulos

Abir Al-Tabbaa



Abstract

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 have 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.

Citation

Qureshi, T., Kanellopoulos, A., & Al-Tabbaa, A. (2016). Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete. Construction and Building Materials, 121, 629-643. https://doi.org/10.1016/j.conbuildmat.2016.06.030

Journal Article Type Article
Acceptance Date Jun 12, 2016
Online Publication Date Jun 18, 2016
Publication Date Sep 15, 2016
Deposit Date Oct 1, 2020
Publicly Available Date Mar 28, 2024
Journal Construction and Building Materials
Print ISSN 0950-0618
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 121
Pages 629-643
DOI https://doi.org/10.1016/j.conbuildmat.2016.06.030
Keywords Powder mineral encapsulation, Expansion, Crack sealing, Strength recovery, Durability, Self-healing kinetics, Materials microstructure
Public URL https://uwe-repository.worktribe.com/output/6726669
Publisher URL https://www.sciencedirect.com/science/article/pii/S0950061816309564

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