Preliminary Mechanical Analysis of Rubber-Cement Composites Suitable for Additive Process Construction

Additive manufacturing for cementitious materials represents the most attractive frontier in the modern context of Construction 4.0. In addition to the technological progress of printing systems, the development of functional and low environmental impact printable mixtures is one of the current chal...

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Bibliographic Details
Published in:Journal of composites science 2020, Vol.4 (3), p.120
Main Authors: Sambucci, Matteo, Marini, Danilo, Sibai, Abbas, Valente, Marco
Format: Article
Language:English
Subjects:
additive manufacturing
Aggregates
Automation
Cement
Design
Ductility
End of life
Environmental impact
Extrusion
Granular materials
Isotropy
Manufacturing
Mechanical analysis
mechanical anisotropy
Mortars (material)
physical-mechanical characterization
printability
Rubber
tire recycling
tire rubber-cement compounds
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Summary:Additive manufacturing for cementitious materials represents the most attractive frontier in the modern context of Construction 4.0. In addition to the technological progress of printing systems, the development of functional and low environmental impact printable mixtures is one of the current challenges of digital fabrication in building and architectural fields. This paper proposes a preliminary physical-mechanical analysis on environmentally friendly mortars, compatible with the extrusion-based printing process, made up of recycling rubber aggregates deriving from end-of-life tires. In this study, two groups of rubber particle samples (0–1 mm rubber powder and 2–4 mm rubber granules) were used to partially/totally replace the mineral fraction of the reference printable mixture. Four tire rubber powder-granules proportions were investigated and control mortar (100% sand) was also prepared to compare its properties with those of the rubber-cement samples in terms of printability properties, mechanical strength, ductility, and structural isotropy. Based on the experimental results, the rubber aggregates increase the mixture fluidity, promoting better inter-layer adhesion than the neat mix. This leads to greater mechanical isotropy. As already investigated in other research works on Rubber-Concrete technology, the addition of rubber particles increases the ductility of the material but reduces its mechanical strength. However, by correctly balancing the fine and coarse rubber fraction, promising physical-mechanical performances were demonstrated.
ISSN:2504-477X
2504-477X
DOI:10.3390/jcs4030120