Full text
| |
| Author(s): |
Francisco Jordão Nunes de Lima
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2024-10-10 |
| Examining board members: |
Rafael Giuliano Pileggi;
Carlos Alberto Fortulan;
Paulo Ricardo de Matos
|
| Advisor: | Rafael Giuliano Pileggi |
| Abstract | |
Concrete 3D printing by extrusion is gaining prominence in civil construction due to its advantages, such as cost, time, and waste reduction, as well as increased efficiency and productivity. However, one of the main challenges of this technology is the existence of systematic procedures for developing materials with characteristics suitable for 3D printing. A review of the literature indicates that the predominant approach relies on trial-and-error methods, often with limited rheological evaluations. This study proposes a systematic methodology for the development of cementitious compositions intended for 3D printing by extrusion. Initially, the extrusion profile and flow behavior of clays were determined using the Benbow and Bridgwater techniques and squeeze flow tests. Subsequently, efforts were made to replicate this behavior in the development of cementitious pastes. The results showed similarities between the extrusion profiles of clays and cementitious pastes up to 100 mm of deformation and in squeeze flow tests for deformations greater than 2 mm. Furthermore, it was found that print quality can be correlated to the squeeze flow test through the geometric parameter /, which associates the layer height with the nozzle diameter. Based on this correlation, it was observed that performing 3D printing within regions of elastic behavior or viscous flow significantly improves print quality. (AU) | |
| FAPESP's process: | 20/01515-8 - Development and evaluation of ecoefficient cementitious compositions for application as 3D printing |
| Grantee: | Francisco Jordão Nunes de Lima |
| Support Opportunities: | Scholarships in Brazil - Master |