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A systematic review on the durability of 3D-printed cementitious materials: ins...
Reis, Rui Jorge Alves Cunha; Aroso, Francisca; Brandão, Filipe Jorge Silva; Camões, Aires; Jesus, Carlos Manuel Gonçalves; Figueiredo, BrunoThis study provides a historical overview of 3D Concrete Printing (3DCP) technology and a systematic review of its durability research. Employing the PRISMA methodology, the review analysed 282 articles from SCOPUS, Web of Science, and Springer. The review identifies the number of studies published in the last decade, the most frequently investigated pathologies, and the main techniques and outcome parameters a...
Assessing orthotropic mechanical performance and digital twin of robotic 3D pri...
Aroso, Francisca; Reis, Rui Jorge Alves Cunha; Brandão, Filipe Jorge Silva; Figueiredo, Bruno; Jesus, Carlos Manuel Gonçalves; Camões, AiresThe advent of robotic additive manufacturing (AM) techniques using cementitious mortars heralds a transformative era in the construction industry, albeit with challenges in assessing the properties of such innovative materials and technologies. This research investigates the geometric and mechanical properties of cementitious mortars tailored for robotic AM, highlighting the need to determine how different tech...
Valorization of Reclaimed Asphalt Pavement (RAP) from the highway materials cir...
Dagostin, J. V.; Bilésimo, N. C.; Zacaron, A.; Arcaro, S.; Camões, Aires; Ribeiro, M. J.; Raupp-Pereira, F.The increasing demand for natural resources in highway construction presents significant environmental and economic challenges. A key issue is the disposal of reclaimed asphalt pavement (RAP), which is often discarded in landfills, despite its potential for reuse in new asphalt mixtures. Although several studies have investigated RAP incorporation, the influence of its particle size distribution on mechanical p...
Concrete protection against carbonation by traditional coatings
Reis, Rui Jorge Alves Cunha; Camões, Aires; Ribeiro, Manuel Guimarães; Malheiro, Raphaele Lira Meireles Castro; Fernandes, ÉliaIn contemporary construction practice, concrete surfaces are commonly coated; however, this factor is often disregarded in durability assessments, particularly with respect to carbonation. Such omission may lead to overly conservative designs and unnecessary material consumption. This study evaluates the actual performance of traditional coatings applied to concrete, considering three types of concrete: ordinar...
WEEE glass as a sustainable supplementary cementitious material: experimental a...
Malheiro, Raphaele; Lemos, André; Camões, Aires; Ferreira, Duarte; Alves, Juliana; Quintelas, Cristina Maria CatalãoThis study investigates the use of waste glass powder derived from fluorescent lamps as a partial replacement for cement in mortar production, aiming to valorize this Waste from Electrical and Electronic Equipment (WEEE) and enhance sustainability in the construction sector. Mortars were formulated by substituting 25% of cement by volume with glass powders from fluorescent lamp glass and green bottle glass. The...
Merging standardization and adaptability for efficient modular construction sol...
Branco, Jorge M.; Tenório, Marina; Alves, Rita; Sousa, Filipe; Ferreira, Rui; Meireis, Cláudio; Leitão, Dinis; Fontes, André; Silva, Sandra MonteiroModular timber construction represents a groundbreaking and eco-friendly advancement in the building sector. The constant evolution of construction methods, technologies and requirements, the concern of those who live architecture and, more recently, the climate crisis and social pressures, have made timber a viable alternative to conventional materials such as concrete, masonry and steel. The lightweight and v...
Mitigação das Ilhas de Calor Urbanas através da Incorporação de Fibras Coaxiais...
Araújo, Vitor M. M.; Hammes, Nathalia; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires[Excerto] Introdução: As Ilhas de Calor Urbanas (ICU) ocorrem devido à substituição de superfícies naturais por materiais, por exemplo, cimentícios e asfálticos, que apresentam elevado calor específico e tendem a reter calor por longos períodos. Uma estratégia promissora para mitigar este efeito pode ser a utilização de argamassas com microfibras contendo materiais de mudança de fase (PCMs). Esses materiais aju...
Infrared thermography of cement mortar with phase change fibres
Hammes, Nathalia; Araújo, Vitor M. M.; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires; Marinho, ElinaUrban Heat Islands (UHIs), aggravated by intense urbanisation and heat-retaining materials from buildings and roads, affect the thermal comfort of human beings. To mitigate this issue, this study aims to study the thermal performance of cement mortars with coaxial polymeric fibres produced by wet spinning and containing polyethylene glycol (PEG 600 and 1000) (CM_PCF) as phase change material. Samples were irrad...
Fineness effect evaluation on the mechanical activity index of glass powder
Jesus, Carlos Manuel Gonçalves; Camões, Aires; Malheiro, Raphaele Lira Meireles Castro; Ribeiro, Manuel; Aguiar, J. L. Barroso deThe increase in CO2 emissions from the cement industry over the years has had an important negative effect on the global environment. In this context, the use of supplementary cementitious materials for cement replace-ment has a decisive role in the cement industry since using waste from other in-dustries has important environmental benefits, including a decrease in CO2 emissions from the decrease in cement use...
Comparative evaluation of photocatalytic efficiency measurement techniques thro...
Lessa, Fabíula Pereira; Lima Jr., Orlando; Margalho, Élida Melo; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, AiresSelf-cleaning cementitious materials, particularly with TiO2-based photocatalytic coatings, offer significant benefits by reducing surface deterioration and maintenance requirements, even in harsh urban environments. Despite the growing interest in self-cleaning cementitious materials, an international standard test method to calculate their efficiency has not yet been established for this specific type of subs...