Browsing by Author "Bartolo, Paulo Jorge"
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- Additive manufacturing as an enabling technology for digital construction: A perspective on Construction 4.0Publication . Duarte, José Pinto; Bartolo, Paulo Jorge; Craveiro, Flávio; Bartolo, HelenaThe construction sector plays a key role in any country's economy.According to a report published by the World Economic Forum, the construction industry currently accounts for about 6% of the world GDP [1] and is expected to reach around 14.7% in 2030 [2]. Construction is a strategically important sector for the European economy involving a wide range of stakeholders and companies, providing 18 million jobs[209]. According to the World Economic Forum, a 1% rise in productivity worldwide could save $100 billion a year in construction costs [3], with the potential to contribute for a country's competitiveness and sustainable development [4–6]. The construction industry consumes a very significant proportion of the raw materials produced around the world, using for instance 50% ofthe global steel production, and is responsible for 30% of the world greenhouse gas emissions. Nonetheless, it provides the fabric of the built environment on which society depends [1,3]. The population living in urban areas is rapidly increasing, which impacts the need for affordable houses, public transportation and utility infrastructure. Yet the perceived image of the construction sector is predominantly low-tech, still relying on craft-based methods, characterized by a poorperformance and quality image [7–10]. The 2016 survey ‘Sustainability in the Supply Chain’ carried out bythe Scape Group [11] concluded that 58% of all construction supplier And contractor respondents identified skilled workforce shortages as anobstacle for a future modernized construction sector
- An automated system for 3D printing functionally graded concrete-based materialsPublication . Craveiro, Flávio; Nazarian, Shadi; Bartolo, Helena; Bartolo, Paulo Jorge; Duarte, José PintoIn recent years, the interest in developing additive manufacturing (AM) technologies in the architecture, engineering and construction (AEC) industry has increased, motivated by the potential to support greater formal complexity. In this context, AM has been largely used to design and fabricate physical parts with homogeneous materials. This paper proposes a new strategy, aimed at the design and fabrication of functionally graded concrete parts with specific thermo-mechanical performance. The paper describes the development of the AM system to materialize such parts. The computational tool developed to design the material to meet specific performance requirements, and the design and testing of the material are described elsewhere. A functionally graded concrete part obtained by replacing sand with cork was produced and is evaluated.
- Combination of 3D Extruded-based Poly (ɛ-caprolactone) Scaffolds with Mesenchymal Stem/Stromal Cells: Strategy OptimizationPublication . Moura, Carla Sofia; Silva, Cláudia Lobato da; Bartolo, Paulo Jorge; Ferreira, Frederico CasteloThis study uses a combination of 3D extruded-based biodegradable scaffolds and human bone marrow-derived mesenchymal stem/stromal cells to understand how scaffold properties can contribute for efficient cell seeding, proliferation and migration. Highly interconnected porous poly(ɛ-caprolactone) scaffolds were produced by a layer-by-layer extrusion. Two configurations were studied with larger (390 μm) or smaller pore size (190 μm) at the centre. MSC, seeded on the top centre of the scaffold surface, increased 5 folds after 13 days of cultivation for both configurations, allowing us to conclude that in this range of pore sizes pose no limitations for cell migration are observed.