In the recent years concrete industry is planning to achieve sustainable goals in the economic, social and environmental fields. It is a challenging task that requires substantial and holistic changes to the current concrete and construction technology, from the material production, to the construction methodology, passing through the structural design. 3D Printing with concrete is a cutting-edge technology that can help the developments of the concrete sector, to make it suitable for the modern society requirements. The most employed technique of Concrete 3D Printing is the extrusion, that involves the continuous layer-by-layer printing of concrete. Several are the requirements that concrete rheology must satisfy, to guarantee the printability, in particular, the pumpability, extrudability and buildability. The higher request of specific concrete characteristics both for its rheology and mechanical strength, is pushing for an increase of the level of accuracy of the testing methodology. Meticulously defined concrete properties have to be met from high precision results obtained from the experimentation. The aim of the thesis is to provide a new testing procedure for the evaluation of the concrete properties at its very early ages, in order to increase the performance of the current experimental instrumentations.
Negli ultimi anni l'industria del calcestruzzo sta pianificando di raggiungere obiettivi sostenibili nei campi economico, sociale e ambientale. È un compito impegnativo che richiede cambiamenti sostanziali e olistici dell'attuale tecnologia del calcestruzzo e delle costruzioni, dalla produzione del materiale, alla metodologia di costruzione, passando per la progettazione strutturale. La stampa 3D con il calcestruzzo è una tecnologia all'avanguardia che può aiutare negli sviluppi del settore del calcestruzzo, per renderlo adatto ai requisiti della società moderna. La tecnica più utilizzata per la stampa 3D del calcestruzzo è l'estrusione, che comporta la stampa continua strato per strato del calcestruzzo. Diversi sono i requisiti che la reologia del calcestruzzo deve soddisfare per garantire la stampabilità, ed in particolare, la pompabilità, l'estrudibilità e la costruibilità. La maggiore richiesta di specifiche caratteristiche del calcestruzzo sia per la sua reologia che per la sua resistenza meccanica, sta spingendo per un aumento del livello di precisione della metodologia di prova. Proprietà meticolosamente definite per il calcestruzzo devono essere rispettate dai risultati ad alta precisione ottenuti dalla sperimentazione. Lo scopo della tesi è di fornire una nuova procedura di prova per la valutazione delle proprietà del calcestruzzo nelle sue primissime età, al fine di aumentare le prestazioni delle attuali strumentazioni sperimentali.
Mechanical properties of 3D printable cementitious composite at very early ages
MARCUCCI, ANDREA
2020/2021
Abstract
In the recent years concrete industry is planning to achieve sustainable goals in the economic, social and environmental fields. It is a challenging task that requires substantial and holistic changes to the current concrete and construction technology, from the material production, to the construction methodology, passing through the structural design. 3D Printing with concrete is a cutting-edge technology that can help the developments of the concrete sector, to make it suitable for the modern society requirements. The most employed technique of Concrete 3D Printing is the extrusion, that involves the continuous layer-by-layer printing of concrete. Several are the requirements that concrete rheology must satisfy, to guarantee the printability, in particular, the pumpability, extrudability and buildability. The higher request of specific concrete characteristics both for its rheology and mechanical strength, is pushing for an increase of the level of accuracy of the testing methodology. Meticulously defined concrete properties have to be met from high precision results obtained from the experimentation. The aim of the thesis is to provide a new testing procedure for the evaluation of the concrete properties at its very early ages, in order to increase the performance of the current experimental instrumentations.File | Dimensione | Formato | |
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Mechanical Properties of 3D Printable Cementitious Composites at Very Early Ages.pdf
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https://hdl.handle.net/10589/182824