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.
|Title of host publication||Concrete Solutions - Proceedings of Concrete Solutions, 5th International Conference on Concrete Repair|
|Number of pages||7|
|Publication status||Published - 2014|
|Event||5th International Conference on Concrete Repair - Belfast, United Kingdom|
Duration: 1 Sep 2014 → 3 Sep 2014
|Conference||5th International Conference on Concrete Repair|
|Period||1/09/14 → 3/09/14|