Article
Construction & Building Technology
Pedro Santos, Laura Sousa, Luis Godinho, Joao R. Correia, A. M. P. G. Dias
Summary: The experimental study focused on the acoustic and thermal behavior of a novel sandwich panel solution based on CLT, named CIT. Results showed that CIT panels had lower sound insulation than equivalent-thickness CLT panels due to mass differences, and analytical models failed to describe their behavior accurately. Variability in thermal resistance was found in both CLT and CIT panels, with the influence of wood's thermal conductivity being marginal due to the lower thermal conductivity of PUR in CIT panels.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Environmental Sciences
Ali Tighnavard Balasbaneh, Willy Sher, David Yeoh, Mohd Norazam Yasin
Summary: This study compares the environmental impact, energy consumption, and life cycle cost of laminated veneer lumber (LVL) and glued laminated timber (GLT) in identical single-story residential buildings. The results show that GLT performs better than LVL in terms of global warming potential, ozone layer depletion, and land use, while LVL has lower terrestrial acidification potential, human toxicity potential, and fossil depletion potential. According to the multi-criteria decision-making method, LVL manufacturing using softwood is the most sustainable choice.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Ali Tighnavard Balasbaneh, Willy Sher
Summary: The study found that in wood construction, CLT can significantly reduce embodied energy consumption, but the cost is slightly higher than GLT. Using a multi-criteria decision-making method based on environmental and economic criteria, the study showed that CLT manufactured with softwood is the most sustainable choice among the alternatives considered.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Emrah Yilmaz, Batuhan Aykanat, Bekir comak
Summary: As the consumption of composite materials continues to grow, there is an increasing concern about their environmental impact. This study provides a comprehensive life cycle inventory of rockwool filled aluminum sandwich facade panels and calculates their environmental impacts. The production stage was found to have the greatest environmental impact, largely due to the use of aluminum sheet. Among the different panels, the 80 mm thick RWFAS panel had the highest environmental impact.
JOURNAL OF BUILDING ENGINEERING
(2022)
Review
Environmental Sciences
Margo Degieter, Xavier Gellynck, Shashank Goyal, Denise Ott, Hans De Steur
Summary: This study examines the use of life cycle cost analysis (LCC) in the agri-food sector through a systematic review, revealing a lack of consensus among researchers on LCC type definitions, system boundaries, and methodological choices. Standardizing the LCC methodology is recommended to ensure comparability and integrating LCC results with other life cycle tools can further support decision-making. LCC is a valuable tool, either on its own or complemented by other life cycle tools.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Mechanics
Miroslav Marjanovic, Gunther Meschke, Emilija Damnjanovic
Summary: The paper presents the development of an object-oriented computational framework for 3D bending and free vibration analysis of multilayer plates, using Reddy's plate theory and layered finite elements. The proposed solver features fast assembly of sparse matrices using matrix vectorization and a novel algorithm for evaluating interlaminar stresses at layer interfaces, ensuring continuity. The performance, efficiency, and accuracy of the computational framework are demonstrated through validation examples comparing results to the exact solution.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Muataz Dhaif, Andre Stephan
Summary: This study compares the life cycle cost and operational energy of a representative case-study house in Bahrain using SIPs and HCBs, showing that SIPs can reduce cooling energy use by 20.6%. Despite higher initial costs, SIP houses are more cost-effective in the long run. Policy recommendations are proposed to improve operational energy efficiency in Bahrain and similar countries along the Arabian Peninsula.
Article
Forestry
Amanda Ceinoti de Almeida, Jorge Daniel de Melo Moura
Summary: Sustainability issues drive the civil construction industry to explore environmentally friendly technologies as alternatives to traditional construction. This study focuses on analyzing the performance of glass-fiber-reinforced polymer (GFRP)-doweled connections between cross-laminated timber (CLT) panels. The results show that flat-butt connections exhibit higher stiffness, while half-lap connections are stronger in terms of strength.
Article
Green & Sustainable Science & Technology
Joana B. Aguiar, Ana M. Martins, Cristina Almeida, Helena M. Ribeiro, Joana Marto
Summary: Freshwater is a scarce and precious resource due to various factors such as population growth, pollution, and economic development. The cosmetics industry heavily relies on water throughout the product life cycle, but companies are taking measures to reduce water consumption and promote sustainability. This includes using sustainable materials, developing waterless products, finding alternative water sources, optimizing manufacturing processes, and improving packaging and transport infrastructure. Consumer education is also important in promoting responsible use and disposal of products. Waterless products offer benefits to both the environment and consumers.
SUSTAINABLE PRODUCTION AND CONSUMPTION
(2022)
Article
Forestry
Benjamin Gartner, Vikram Yadama, Lloyd Smith
Summary: The purpose of this study is to develop high-performance wood strand panels for automotive application using resin transfer and compression resin transfer molding technologies. The results showed that using low-density polyethylene for bonding can stabilize the wood strand preforms, and the resin transfer molded wood strand composites exhibit superior mechanical properties and dimensional stability.
Article
Polymer Science
Nussalin Thongcharoen, Sureurg Khongtong, Suthon Srivaro, Supanit Wisadsatorn, Tanan Chub-uppakarn, Pannipa Chaowana
Summary: The study found that the types of surface layer materials significantly impact the properties of SIP, with cement particleboard and fiber-cement board SIPs showing high mechanical properties and water resistance. However, the plywood-covered SIP had drawbacks of high water absorption and low fire resistance, which need improvement.
Article
Green & Sustainable Science & Technology
Pedro Frazao Pedroso, Jose Dinis Silvestre, Giovanni Borsoi, Ines Flores-Colen
Summary: This study aims to quantify the environmental and economic impacts of different ETICS protection solutions and demonstrate the influence of weights on the results through multicriteria analysis.
Article
Green & Sustainable Science & Technology
Kevin Allan, Adam R. Phillips
Summary: The study found that mass timber buildings have advantages in categories such as eutrophication potential, human health particulates, and global warming potential, with reductions of 31% to 41% compared to steel designs. On the other hand, steel buildings show lower impacts in categories like smog potential, acidification potential, and ozone depletion potential, with reductions of 48% to 58% compared to mass timber designs.
Article
Materials Science, Composites
Avishek Chanda, Nam Kyeun Kim, Debes Bhattacharyya
Summary: Composite sandwich structures using fire-retardant wool-polypropylene core sandwiched between wood veneers demonstrate superior fire-reaction properties and mechanical properties compared to traditional plywood and solid FR wool-PP composites.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Civil
Miriam Kleinhenz, Alar Just, Andrea Frangi
Summary: The experimental programme focused on the structural behavior, fire behavior, and fire resistance of CLT rib panels, confirming the importance of the quality of the glue line and noting that conservative assumptions in fire behavior tests led to underestimation of fire resistance.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Geological
Delfim Soares, Luis Godinho
Summary: This paper proposes two adaptive numerical approaches to analyze nonlinear porodynamic models, simplifying and decoupling each phase to obtain simpler, smaller, and better-conditioned systems of equations, which can be handled without iterative computation when considering nonlinear models. Additionally, incompressible and impermeable media can be directly analyzed without special discretization procedures.
Article
Materials Science, Paper & Wood
Andre M. A. Dias, Pedro G. G. Santos, Alfredo M. P. G. Dias, Jose D. Silvestre, Jorge de Brito
Summary: This study compared the environmental impacts of different durability scenarios for a wood structure, finding that softwoods treated with superficial methods had the lowest impact, while hardwoods did not have enough durability even when treated with pressurized methods.
WOOD MATERIAL SCIENCE & ENGINEERING
(2022)
Article
Engineering, Geological
Alexandre Castanheira-Pinto, Aires Colaco, Jesus Fernandez Ruiz, Pedro Alves Costa, Luis Godinho
Summary: In recent years, the railway sector has made significant advancements in terms of train speed, leading to new challenges in infrastructure performance. The critical speed effect, which amplifies track response and poses safety and maintenance concerns, can be mitigated through soil reinforcement with jet grouting columns. The reinforcement of layered grounds has been proven to considerably improve the critical speed of the railway system, and a simplified methodology for accurately predicting critical speed has been proposed.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Joao Lazaro, Matheus Pereira, Pedro Alves Costa, Luis Godinho
Summary: Rail transport is the most sustainable mode of transportation, but railway noise is a significant issue in urban areas. Noise barriers are commonly used to mitigate railway noise, but their height can make people feel enclosed. Placing the barriers close to the track may provide a solution. This paper illustrates the development of a low-height barrier solution using numerical modeling with the Boundary Element Method (BEM), which directs the energy back to the track to utilize the acoustic properties of the ballast.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Denilson Ramos, Luis Godinho, Paulo Amado-Mendes, Paulo Mareze
Summary: In this study, a thin low frequency acoustic metamaterial called Acoustic Honeycomb Metasurface (AHS) is developed for wideband perfect absorption and sound transmission. The results show high absorption efficiency and low-frequency broadband absorption.
Article
Forestry
Andre Manuel Dias, Jose Saporiti Machado, Alfredo M. P. G. Dias, Jose Dinis Silvestre, Jorge de Brito
Summary: This study quantifies and compares the environmental impacts of production systems of biomass and roundwood from different wood species. The results show that eucalyptus roundwood and biomass had the highest environmental impacts, while cryptomeria products had the lowest impacts. The study also compares different allocation methods and finds that economic allocation results in the lowest environmental impact for biomass.
Article
Forestry
Estefani Sugahara, Andre Dias, Felipe Arroyo, Andre Christoforo, Michelle L. L. Costa, Edson C. C. Botelho, Alfredo M. P. G. Dias, Cristiane Campos
Summary: This study evaluated the effects of heat treatment on Oriented Strand Board (OSB) panels and proposed an alternative solution without the use of chemical preservatives. The results showed that heat treatment improved the physical properties of the panels without reducing their mechanical properties, and different layer proportions can be adopted without compromising the panel's performance.
Article
Chemistry, Multidisciplinary
Laura Sousa, Luis Pereira, David Montes-Gonzalez, Denilson Ramos, Paulo Amado-Mendes, Juan Miguel Barrigon-Morillas, Luis Godinho
Summary: This study presents the use of porous concrete material with expanded clay as aggregate for the sound-absorption layer of noise barriers. A theoretical material model is calibrated using experimental data and validated through reverberant room measurements. Numerical simulations using the boundary element method (BEM) and CNOSSOS-EU calculation method show the performance of different types of barriers incorporating this material. Good insertion loss values can be achieved by carefully choosing the location of the material within conventional or low-height noise barriers.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Kleber de Almeida Goncalves, Daniela Silva Santurio, Delfim Soares, Pedro Alves Costa, Luis Godinho
Summary: The use of boundary elements in the analysis of exterior acoustic problems faces challenges due to the presence of fictitious eigenfrequencies at internal resonances of cavities, which can lead to inaccurate results or unstable behavior. To address this non-uniqueness problem, a scheme based on the combined Helmholtz integral equation formulation (CHIEF) is proposed, although it requires additional equations and points. This study proposes a strategy to determine good approximations for the position and number of these points, based on an optimization process that maximizes the system matrix's smallest singular value. The proposed algorithms automatically circumvent the non-uniqueness problem, with low computational cost and simple implementation, thus aiding the development of more stable BEM codes.
APPLIED SCIENCES-BASEL
(2023)
Article
Acoustics
M. Veloso, M. Pereira, L. Godinho, P. Amado-Mendes, J. Redondo
Summary: Noise attenuation by sonic crystal noise barriers occurs mainly in specific frequency bands (bandgaps), due to a mechanism called Bragg scattering, which is the result of destructive interference between multiple reflections. Sound-absorbing materials can be used to coat the rigid scatterers to increase attenuation in other frequency bands. This study used the Method of Fundamental Solutions (MFS) to evaluate the performance of sonic crystal noise barriers covered with porous and granular materials. Numerical models were validated by experimental tests and compared with results obtained using the Finite Element Method (FEM). Numerical tests were performed to predict the acoustic behavior of sonic crystal noise barriers covered with porous concrete.
Article
Acoustics
Javier Redondo, Luis Godinho, Kestutis Staliunas, Juan Vicente Sanchez-Perez
Summary: The design and development of advanced devices based on metamaterials to control the transmission of acoustic waves is a hot topic. An important class of these metamaterials is based on phononic crystals with Locally Resonant Structure, included in those commonly known as Locally Resonant Sonic Materials. The authors develop a comprehensive numerical model of periodic arrays of Hemholtz resonators, which explains in detail the physical mechanisms of destructive interference and allows the reproduction of the consequences of the interference. The numerical results are supported by experimental tests.
Article
Environmental Sciences
Tommaso D'Orazio, Francesco Asdrubali, Luis Godinho, Matheus Veloso, Paulo Amado-Mendes
Summary: Recent research has focused on the application of sonic crystals as noise barriers and exploring aspects for their further development. The study validates numerical models using laboratory experimentation and finite element method (FEM) computation, providing confidence for analyzing practical sonic crystal configurations. The research also examines various geometric arrangements of the scatterers and introduces randomness to analyze their effect on the sonic crystal's insertion loss.
Article
Chemistry, Multidisciplinary
Javier Redondo, Pau Gaja-Silvestre, Luis Godinho, Paulo Amado-Mendes
Summary: This study explores the relationship between insertion loss and acoustic insulation and proposes a method to predict insertion loss through acoustic numerical simulation.
APPLIED SCIENCES-BASEL
(2022)