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

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 releas...

Full description

Saved in:
Bibliographic Details
Published in:Materials 2015-04, Vol.8 (4), p.1897-1923
Main Authors: Formia, Alessandra, Terranova, Salvatore, Antonaci, Paola, Pugno, Nicola Maria, Tulliani, Jean Marc
Format: Article
Language:English
Subjects:
Cements
Concrete
Cracks
Devices
Durability
Engineering
Extrusion
Healing
Investigations
Mortars
Releasing
Silica
Tubes
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma8041897