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Materials 2015, 8(4), 1897-1923;

Setup of Extruded Cementitious Hollow Tubes as Containing/Releasing Devices in Self-Healing Systems

Department of Applied Science and Technology, INSTM Reference Laboratory for Ceramics Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
Department of Structural, Geotechnical and Building Engineering, Laboratory of Bio-Inspired Nano-Mechanics "Giuseppe M. Pugno", Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
Laboratory of Bio-Inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano, 77, I-38123 Trento, Italy
Center for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, I-38123 Povo (Trento), Italy
School of Engineering & Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Received: 27 February 2015 / Revised: 6 April 2015 / Accepted: 14 April 2015 / Published: 21 April 2015
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The aim of this research is to produce self-healing cementitious composites based on the use of cylindrical capsules containing a repairing agent. Cementitious hollow tubes (CHT) having two different internal diameters (of 2 mm and 7.5 mm) were produced by extrusion and used as containers and releasing devices for cement paste/mortar healing agents. Based on the results of preliminary mechanical tests, sodium silicate was selected as the healing agent. The morphological features of several mix designs used to manufacture the extruded hollow tubes, as well as the coatings applied to increase the durability of both core and shell materials are discussed. Three-point bending tests were performed on samples produced with the addition of the above-mentioned cementitious hollow tubes to verify the self-healing effectiveness of the proposed solution. Promising results were achieved, in particular when tubes with a bigger diameter were used. In this case, a substantial strength and stiffness recovery was observed, even in specimens presenting large cracks (>1 mm). The method is inexpensive and simple to scale up; however, further research is needed in view of a final optimization. View Full-Text
Keywords: concrete; microcracking; mechanical properties; durability; self-healing concrete; microcracking; mechanical properties; durability; self-healing

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Formia, A.; Terranova, S.; Antonaci, P.; Pugno, N.M.; Tulliani, J.M. Setup of Extruded Cementitious Hollow Tubes as Containing/Releasing Devices in Self-Healing Systems. Materials 2015, 8, 1897-1923.

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