Qualitative assessment of interfacial bonding in 3D printing concrete exposed to frost attack
| Autor: | Farook Hamzeh, Bilal S. Hamad, Joseph J. Assaad |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Interfacial bonding Polymers Materials Science (miscellaneous) Air entrainer 0211 other engineering and technologies 3D printing 020101 civil engineering 02 engineering and technology 0201 civil engineering Natural rubber 021105 building & construction lcsh:TA401-492 Composite material Frost resistance business.industry Bond strength Drop (liquid) Durability 3D concrete visual_art visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials Extrusion Mortar business |
| Zdroj: | Case Studies in Construction Materials, Vol 13, Iss, Pp e00357-(2020) |
| ISSN: | 2214-5095 |
| DOI: | 10.1016/j.cscm.2020.e00357 |
| Popis: | The 3D printing technology is a novel construction process to build concrete structures layer-by-layer based on computer digital programs. The main objective of this research program is to develop a testing protocol that replicates the successive placement of mortar layers and satisfactorily measures the effect of repeated freeze/thaw (F/T) cycles on durability and interfacial bond strengths. Three mortar series made with different binder and mixing water contents are tested; the consistency of mixtures was adjusted to allow proper extrusion using a laboratory 3D printer. Particular emphasis was placed to compare the efficiency of air-entraining agent (AEA) and styrene-butadiene rubber (SBR) latexes to protect mortars against deterioration due to frost attack. The incorporation of SBR was found more efficient than AEA to mitigate the drop in bond strength due to F/T cycles, given the enhanced flexibility of the polymer-modified mortars that accommodate the deformations and stresses created along the interfaces. The pull-off test results obtained were successfully validated using specimens generated from the laboratory 3D printer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|