CUED Publications database

Alternative repair system for concrete using microencapsulated healing agents

Litina, C and Kanellopoulos, A and Al-Tabbaa, A (2014) Alternative repair system for concrete using microencapsulated healing agents. In: UNSPECIFIED pp. 97-103..

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An intrinsic self-sustained recovery system is proposed based on the inclusion of repair agents within a concrete matrix. Three different microencapsulation protocols for the encapsulation of an acrylic-based repair material are being investigated. Polyurethane (PU), urea-formaldehyde (UF) and tetraethylorthosilicate (TEOS) based shell microcapsules were synthesised through an in situ interfacial polymerisation process. Confirmation of the encapsulation process and characterisation of structure, chemistry and thermal stabilities was performed by scanning electronic microscope (SEM), thermal analysis (TG-DTA) and FTIR spectroscopy. The results showed that PU, UF and TEOS microcapsules containing methylmethacrylate (MMA) were successfully prepared via the suggested protocols. The average microcapsule size was 0.3, 1.9 and 3.5 μm, respectively. High yields of free flowing powder were produced with all methods. Chemical and thermal characterisation infer that the produced spherical capsules satisfy the requirements for use in the proposed self-repair system. © 2014 Taylor & Francis Group.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:16
Last Modified: 30 Mar 2021 06:54
DOI: 10.1201/b17394-16