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

Materials

Alessandra Formia¹  Salvatore Terranova¹  Paola Antonaci²  Nicola Maria Pugno³  Jean Marc Tulliani¹ 

[1] Department of Applied Science and Technology, INSTM Reference Laboratory for Ceramics Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy; E-Mails:;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; E-Mail:;Laboratory of Bio-Inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano, 77, I-38123 Trento, Italy; E-Mail:

关键词: concrete;    microcracking;    mechanical properties;    durability;    self-healing;   

DOI  :  10.3390/ma8041897

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.