158 documents found, page 1 of 16
Leveraging ML for predicting UCS of soil stabilised with one-part alkali-activa...
Tinoco, Joaquim; Pinheiro, João Manuel Machado; Cristelo, Nuno; Rodrigues, Mafalda; Miranda, Tiago F. S.The transition to sustainable construction materials has driven interest in alternatives to Portland cement. Soil stabilisation with alkali-activated binders is a promising approach, yet its widespread application requires reliable predictive tools for assessing unconfined compressive strength (UCS). This study explores the use of machine learning algorithms to predict UCS in soil stabilised with a one-part alk...
Application of electric arc furnace slag as an alternative precursor to blast f...
Cristelo, Nuno; Coelho, João Diogo; Rivera, Jhonathan; Garcia-Lodeiro, Inés; Miranda, Tiago F. S.; Fernández-Jiménez, AnaIn steel manufacturing, electric arc furnaces are increasingly common, as they use mostly scrap metal as ore source. Thus, blast furnace slag (BFS) is decreasing, while electric arc slag (EAFS) is proportionally increasing. This study focuses on the potential of EAFS in alkaline cements, as precursor or aggregate. Different EAFS/BFS mixtures, some including fly ash (FA), were activated with a NaOH solution, and...
Landslide analysis combining laser scanning and photogrammetry
Pinto, Pedro; Barros, Juliana; Pinheiro, Marisa Mota; Tomás, Roberto; Miranda, Tiago F. S.; Pereira, E. N. B.After a sequence of weeks of heavy raining, a catastrophic mass movement occurred in the parish of Palmeira de Faro, Esposende (N Portugal) on November 23, 2022. The collapsed slope presented a maximum height of about 21 m and a length of 45 m. In order to document and analyse this case from the geotechnical perspective, a general survey was devised including the use of aerial photography, laser scanning and co...
Knitted textile KTPs for instrumented underwater building systems
Monteiro, Filipa Maria Barbosa Faria; Pereira, E. N. B.; Almeida, João Alberto Pinheiro Pereira; Cruz, Fábio Quintas; Barajas, Diddyer Alexander Prada[Excerpt] The main scope of this study was to assess the potential of knitted textiles for underwater instrumented underwater building systems, using textile knitted preforms (multi-shape; multimaterial; etc…), using natural fibres (Hemp, Linen and Cotton).
Sustainability assessment of half-sandwich panels based on alkali-activated cer...
Vaca, Norma Yolanda Gaibor; Mateus, Ricardo; Leitão, Dinis; Cristelo, Nuno; Miranda, Tiago F. S.; Pereira, E. N. B.; Cunha, Vitor M. C. F.This study assessed the sustainability of two partition walls and intended to contribute to the Circular Economy in the construction sector. A life cycle approach and a multi-criteria decision support method were applied to know the environmental, functional, and economic performances of the production process of half-sandwich panels based on alkali-activated ceramic/slag waste cement, choosing as system bounda...
Numerical analysis of the flow field and cross section design implications in a...
Maslov, Dmytro; Pereira, E. N. B.; Duarte, Duarte; Miranda, Tiago F. S.; Ferreira, Vasco; Tieppo, Marcos; Cruz, Fábio; Johnson, JessicaNowadays, multifunctional artificial reefs are integrated in coastal areas all around the world. The design of such structures is currently complex and subjective. In this context, it is essential to improve overall design approaches to more effectively relate artificial reef geometry, function and optimal performance to specific deployment sites. Part of the solution to this challenge may lie in the use of in ...
Physical-mechanical properties of a granite used in the UNESCO World Heritage o...
Tomás, Roberto; Cano, Miguel; Pulgarín, Luis F.; Brotons, Vicente; Benavente, David; Miranda, Tiago F. S.; Vasconcelos, GraçaThis paper studies the evolution of physical and mechanical properties of 46 cubic samples of a granite widely used in the UNESCO World Heritage of the north of Portugal pre-treated at different temperatures (between 105 and 700 °C) and cooled under different conditions (i.e., aircooled and water-cooled). The results showed that specific gravity and mineralogy did not exhibit significant changes after the therm...
Geotextile reinforced strip footing: numerical modeling and analysis
Yalaoui, Nadia; Trouzine, Habib; Meghachou, Mourad; Miranda, Tiago F. S.This paper aims to evaluate the impact of geotextile used on strip footing settlement and bearing capacity in sandy soil. Comparing reinforced and unreinforced soil foundations required numerical analysis. To determine their influence on the footing bearing capacity, the stiffness, number, and spacing of reinforcing layers were investigated parametrically using the validated numerical model. The failure stage i...
Numerical analysis of a tunnel behaviour considering the spatial variability of...
Miranda, Tiago F. S.; Viana, Ana; Martins, Francisco F.; Guo, Xiangfeng; Cristelo, Nuno; Dias, DanielThis study applies random field theory to simulate the spatial variability of the ground where a tunnel was excavated in a granitic soil mass, in the city of Porto (Portugal). Numerical analyses are performed using finite element method combined with random field theory to simulate tunnel excavation. A parametric study to analyse the influence of the correlation coefficient is performed. The results are compare...
Fiber-reinforced alkali-activated cements from ceramic waste and ladle furnace ...
Gaibor, Norma; Leitão, Dinis; Miranda, Tiago F. S.; Cristelo, Nuno; Fernandes, Lisete; Pereira, E. N. B.; Cunha, Vitor M. C. F.Alkaline-activated cement, as an alternative to conventional portland cement, is being increasingly studied due to its environmental advantages and engineering properties. However, research on the feasibility of using both uncommon precursors and curing at ambient temperature is still limited. This study aims to investigate the potential of ceramic wastes, specifically from brick and tile production and ladle f...