University of Hertfordshire

Alternative repair system for concrete using microencapsulated healing agents

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Original languageEnglish
Title of host publicationConcrete Solutions - Proceedings of Concrete Solutions, 5th International Conference on Concrete Repair
PublisherCRC Press/Balkema
Pages97-103
Number of pages7
ISBN (Print)9781138027084
Publication statusPublished - 2014
Event5th International Conference on Concrete Repair - Belfast, United Kingdom
Duration: 1 Sep 20143 Sep 2014

Conference

Conference5th International Conference on Concrete Repair
CountryUnited Kingdom
CityBelfast
Period1/09/143/09/14

Abstract

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.

ID: 12865157