12 documents found, page 1 of 2
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...
Marcações horizontais termocrómicas: sensores a base de cor para alertar condut...
Lima Jr., Orlando; Rocha Segundo, Iran; Mazzoni, Laura Nascimento; Freitas, E. F.; Carneiro, Joaquim A. O.As condições climatéricas são fatores críticos em acidentes rodoviários. Em situações adversas de gelo ou neve sobre o pavimento, o atrito superficial é significativamente reduzido, diminuindo a segurança rodoviária. Com a finalidade de alertar os condutores sobre a possível presença dessas condições sobre pavimentos betuminosos, este estudo tem como principal objetivo desenvolver Marcações Rodoviárias (MR) uti...
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...
Designing CNF-reinforced coaxial phase change fibres for thermal regulation in ...
Hammes, Nathalia; Pinheiro, Inês; Lima Jr., Orlando; Marinho, Elina; Silva, Mauela; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Excerto] Urban Heat Islands (UHIs), intensified by the high thermal retention capacity of conventional construction materials, contribute to elevated temperatures in urban areas, compromising indoor thermal comfort and directly impacting the health and well-being of the population. As a mitigation strategy, the incorporation of coaxial fibres with phase change materials (PCFs) stands out for their ability to p...
Designing coaxial polymeric fibres with phase change materials for thermal regu...
Hammes, Nathalia; Monteiro, José; Lima Jr., Orlando; Marinho, Elina; Silva, M. Manuela P.; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Abstract] Urban expansion and the widespread use of heat-absorbing materials have intensified the Urban Heat Island (UHI) effect. As a result, rising surface temperatures pose significant challenges to energy efficiency, human well-being, and environmental quality. Incorporation of phase change materials (PCMs) into civil engineering materials (CEM) has emerged as a promising passive strategy for thermal regul...
Evaluation of band gap energy of TiO2 precipitated from titanium sulphate
Landi Jr., Salmon; Segundo, Iran Gomes Rocha; Afonso, Cátia; Lima Jr., Orlando; Costa, Manuel F. M.; Freitas, E. F.; Carneiro, Joaquim A. O.The determination of the band gap energy () of semiconductors powder materials can be performed from diffuse reflectance spectroscopy (DRS) measurements. For this purpose, the classical theory proposed by Kubelka and Munk (K-M) and the so-called plot Tauc, both discussed here, have been largely employed. We investigate the values of anatase TiO2 particles synthesized by precipitation of titanyl sulphate in the ...
Applied optics in the development of smart asphalt mixtures
Segundo, Iran Gomes Rocha; Landi Jr., Salmon; Afonso, Cátia; Lima Jr., Orlando; Freitas, E. F.; Castelo Branco, Verônica; Costa, Manuel F. M.The functionalization of asphalt mixtures is carried out in order to provide new capabilities to the road pavements, with major social, environmental and financial benefits. Optical characterization techniques as well as optical processes like photocatalysis play a major role in the development of new asphalt mixtures with smart functions. These advanced capabilities which are being developed in asphalt mixture...
Thermochromism applied to transportation engineering: asphalt roads and paints
Lima Jr., Orlando; Cardoso, Pedro; Segundo, Iran Gomes Rocha; Freitas, E. F.; Costa, Manuel F. M.; Nascimento,Heriberto; Afonso, CátiaThermochromic materials change their optical response to temperature reversibly. This study explores the application of thermochromism to road engineering, which is still incipient in this area, from two perspectives. The first one is about the development of functionalized road markings (FRM) working as thermochromic sensors to alert the presence of ice on the road and, in this way, to improve road safety. The...
Functionalization of smart recycled asphalt mixtures: a sustainability scientif...
Rocha Segundo, Iran; Zahabizadeh, Behzad; Landi Jr., Salmon; Lima Jr., Orlando; Afonso, Cátia; Borinelli, Jaffer; Freitas, E. F.; Cunha, Vítor M. C. F.The sustainable development of our societies demands strong efforts on scientific and technological research while informing and educating students and the general population. Air pollution and road safety hazards constitute two main public health problems that are insufficiently addressed pedagogically. With this work, we aim to contribute to tackeling the problem by presenting the results of scientific resear...