Article
Construction & Building Technology
Villu Kukk, Laura Kaljula, Jaan Kers, Targo Kalamees
Summary: Keeping wood dry is crucial to prevent moisture damages in wooden buildings. This study evaluated the impact of different wall assemblies, facade orientation, and initial moisture content on the hygrothermal performance of CLT external walls. Field measurements and simulation models showed that CLT walls were safe in cold and humid climate, and low vapour permeable insulation with airtight installation could be beneficial. Cellulose insulation was also considered safe when weather protection was not available.
BUILDING AND ENVIRONMENT
(2022)
Article
Forestry
Seungmin Yang, Hyunjae Lee, Gyuwoong Choi, Seoggoo Kang
Summary: The mechanical properties of four ply-lam cross-laminated timbers containing a plywood layer were compared with those of glued laminated timber and cross-laminated timber. The study found that glued laminated timber had the highest bending, out-of-plane shear, and compression strengths. The ply-lam CLTs had higher modulus of elasticity values than glued laminated timber, but lower modulus of rupture values.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Construction & Building Technology
Catarina Silva, Jorge M. Branco, Zabih Mehdipour, Jose Xavier, Paulo B. Lourenco
Summary: Cross-laminated timber (CLT) panels have gained attention in mass timber construction for their mechanical performances, but their performance under cyclic moisture variations is not well understood. A study used Digital Image Correlation (DIC) and ultrasound tests to investigate stress distribution in CLT panels and provided design recommendations, such as limiting longitudinal length and protecting panels in the longitudinal direction.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Villu Kukk, Adeniyi Bella, Jaan Kers, Targo Kalamees
Summary: This research investigated the impact of high moisture content on the air tightness properties of CLT, finding that high moisture content significantly weakens the air tightness of external CLT walls. Therefore, planning and implementing moisture safety in CLT construction is essential to ensure the effectiveness of CLT as an air-tight layer.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Villu Kukk, Jaan Kers, Targo Kalamees, Lin Wang, Hua Ge
Summary: The aim of this study was to establish critical limit values for CLT external wall design in order to prevent the risk of mold growth on the CLT surface in a cold and humid climate using a stochastic approach.
BUILDING AND ENVIRONMENT
(2022)
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
Forestry
Kohei Komatsu, Makoto Nakatani, Toru Nakahara, Kenji Komatsu, Yasunobu Noda
Summary: This study fabricated finger-jointed CLT test specimens using different experimental parameters and subjected them to destructive tests to evaluate the mechanical performance. The majority of tested groups met the requirements for characteristic strength values, while all groups satisfied the proposed design stiffness values.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2021)
Article
Construction & Building Technology
Shrenik Bora, Arijit Sinha, Andre R. Barbosa
Summary: The study conducted cyclic tests on a series of CLT shear wall-to-diaphragm L-bracket connections after subjecting them to a wetting and redrying cycle. The impact of moisture exposure on the connection performance was investigated, showing a statistically significant decrease in total energy dissipation capacity.
JOURNAL OF STRUCTURAL ENGINEERING
(2021)
Article
Construction & Building Technology
Chen Li, Sheng-cai Li, Kong Yue, Peng Wu, Zhong-ping Xiao, Jun Zhang
Summary: The aim of this study was to propose analytical solutions and an optimization design method for the bending behavior of cross-laminated timber (CLT) beam, considering the orthotropy of timber and interface slip between the neighboring layers. The proposed solutions were based on the two-dimensional (2D) elasticity theory without transverse shear deformation assumption and obtained by solving differential equations and determining unknown coefficients. The comparison study showed that the proposed solutions had higher accuracy than the Euler-Bernoulli beam solution and isotropic solution. The interfacial stiffness was found to have an economical upper bound, and an optimal configuration of geometry and material could increase the bending stiffness. We have released the program for the proposed analytical solutions at https://github.com/Njtpw/CLT-Beam.git.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Materials Science, Paper & Wood
Kristin Brandt, Greg Latta, Dane Camenzind, Dan Dolan, Don Bender, Alex Wilson, Michael Wolcott
Summary: The use of cross-laminated lumber (CLT) in building construction is gaining interest in the US and Canada. A study has provided a method to quantify the CLT market and lumber supply situation, predicting continued growth in demand despite the potential market size being less than existing CLT production.
Article
Forestry
Marina Totsuka, Kenji Aoki, Masahiro Inayama
Summary: This paper presents a methodology to evaluate the behavior of concentrated compressive load on the narrow face of cross-laminated timber (CLT) panels, taking into account various factors and using exponential function curve equations to predict yield stress and Young's modulus. The methodology was verified experimentally and showed similar results to previous studies, considering the effects of out-of-plane deformations in the outermost laminae.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2022)
Article
Forestry
Byrne Miyamoto, Nathan J. Bechle, Douglas R. Rammer, Samuel L. Zelinka
Summary: This paper investigates the strength of wood adhesive bonds under high temperatures, aiming to better understand heat delamination in cross laminated timber. By scaling down tests and comparing different adhesives, it provides insights on which adhesives may pass fire tests prior to full scale testing.
Article
Construction & Building Technology
Daniel P. Hindman, Benjamin Richardson, Achmaa Vaanjilnorov
Summary: This paper presents an alternative method for evaluating the dowel bearing strength of CLT according to US design code. The proposed method is compared with European and Canadian codes and demonstrates similar results, slightly conservative compared to experimental values.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Minh-Van Thai, Sidi Mohammed Elachachi, Sylvain Menard, Philippe Galimard
Summary: This study focused on the dynamic properties of CCC beams with notched connectors, and found improvements in fundamental frequency and modal damping compared to bare CLT beams.
ENGINEERING STRUCTURES
(2021)
Article
Mechanics
Le Van Tu, Abdallah Ghazlan, Nguyen Tuan, Ngo Tuan
Summary: This study investigates the impact of bioinspired conch-like structure on the performance of cross-laminated timber (CLT) under blast loading, and finds that the conch-like structure can enhance the performance of CLT by reducing damage mechanisms.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Seong Jin Chang, Youngtag Kim, Gyeong Seok Choi, Seunghwan Wi, Yujin Kang, Sumin Kim
Summary: Applying enhanced insulation products to buildings can improve building energy performance and reduce carbon emissions, aiding in climate change mitigation. This study developed new materials and technologies to improve the thermal performance of VIPs, proposing a VIP composite board for enhanced constructability.
ENERGY AND BUILDINGS
(2021)
Article
Environmental Sciences
Seunghwan Wi, Ji Hun Park, Young Uk Kim, Sungwoong Yang, Sumin Kim
Summary: As energy use in the building sector increases worldwide, the demand for building materials with energy-saving characteristics and low thermal conductivity is growing. This study evaluated the main performance of 21 insulation materials used at construction sites, including thermal conductivity, water absorption rate, and acidity, providing appropriate methods for assessing their performance.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Jisoo Jeon, Ji Hun Park, Hyeonseong Yuk, Young Uk Kim, Beom Yeol Yun, Seunghwan Wi, Sumin Kim
Summary: Wood is a sustainable resource and building material that may suffer structural defects due to decay from moisture. By using biochar to prepare wood-derived biocomposites, it is possible to improve thermal insulation performance and water stability.
ENVIRONMENTAL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Hyeonseong Yuk, Sungwoong Yang, Young Uk Kim, Beom Yeol Yun, Seunghwan Wi, Sumin Kim
Summary: The study analyzed the effects of absorbent porous sediments (PAS) and micro-encapsulated phase change materials (MPCM) on the indoor environment and on each other's abilities. By varying the mixing ratio, it was found that indoor finishing materials can effectively control humidity and temperature, exhibiting excellent performance.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Environmental
Dimberu G. Atinafu, Beom Yeol Yun, Young Uk Kim, Seunghwan Wi, Sumin Kim
Summary: This study explores the use of "green" composite phase change materials prepared using biochar materials and organic phase change material n-eicosane (ES) for efficient thermal energy storage applications. The research found that composite materials derived from wheat straw biochar showed high energy storage capacity, while those derived from softwood biochar had lower latent heat storage capacity.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Construction & Building Technology
Seunghwan Wi, Sungwoong Yang, Beom Yeol Yun, Sumin Kim
Summary: Among various construction methods, external insulation finishing can effectively utilize thermal energy of buildings and improve efficiency, optimized by using phase change material (PCM). The use of PCM in mortar composite specimen showed a significant improvement in time-lag effect by 59.4% even with just 10 wt% of MPCM, indicating excellent thermal storage performance for significant thermal performance improvement in building applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Seunghwan Wi, Yujin Kang, Sungwoong Yang, Young Uk Kim, Sumin Kim
Summary: This study quantitatively analyzed five types of insulation materials and pollutants generated from building materials, examining the effects of pollutants discharged from insulation materials on the indoor environment. The necessity of legal management of contaminants emitted from insulation materials was proposed based on empirical research results.
ENVIRONMENTAL POLLUTION
(2021)
Article
Construction & Building Technology
Beom Yeol Yun, Yujin Kang, Young Uk Kim, Seunghwan Wi, Sumin Kim
Summary: This study aimed to analyze the effect of using phase change materials (PCMs) to stabilize room temperature and solve the problem of temperature instability for temporary hospital beds. The results showed that the application of macro packed PCMs (MPPCM) in buildings can effectively reduce box temperature, providing a comfortable indoor space for temporary beds.
BUILDING AND ENVIRONMENT
(2022)
Article
Engineering, Environmental
Sungwoong Yang, Hyeonseong Yuk, Beom Yeol Yun, Young Uk Kim, Seunghwan Wi, Sumin Kim
Summary: This study highlights the importance of improving building airtightness to reduce indoor fine dust concentration. By applying technologies such as sealing film, sealing lid, and padding, the experiment demonstrated a significant reduction in air leakage and indoor fine dust concentration.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Dimberu G. Atinafu, Beom Yeol Yun, Sungwoong Yang, Yujin Kang, Sumin Kim
Summary: This article reports on the thermal performance of a hybrid material supported n-alkane after one year of storage and 50 heating/cooling cycles. The hybrid material, consisting of metal-organic framework (MOF) and graphite, showed improved shape/thermal stability of tetradecane (TD) with high latent heat retention capacity, low leakage rate, and high PCM loading capacity, making it suitable for thermal management applications such as industrial waste heat recovery systems. The intermolecular interactions and capillary forces between the hybrid materials and TD provided high stability and compatibility, indicating the potential of the hybrid material in developing composite PCMs with comprehensive thermal characteristics.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Construction & Building Technology
Su-Gwang Jeong, Seunghwan Wi, Seong Jin Chang, Sumin Kim
Summary: In this study, a high heat storage capacity material was prepared by combining fine aggregates based on paraffinic shape-stabilized phase change materials with exfoliated graphite nanoplatelets as stabilizing additives. The resulting material displayed acceptable chemical stability, high thermal performance, and a considerable latent heat capacity, with peak temperatures lower than plain CSHC. Additionally, the material showed a time lag effect exceeding 720 min and resulted in an 8.18% maximum cooling energy reduction in energy simulation analysis.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Physical
Dimberu G. Atinafu, Beom Yeol Yun, Sungwoong Yang, Hyeonseong Yuk, Seunghwan Wi, Sumin Kim
Summary: This review highlights the recent progress in the design of composite PCMs based on hybrid nanoadditives, including fabrication and classification, potential applications, and synergistic effects of individual supporting materials on the thermal properties of PCMs.
ENERGY STORAGE MATERIALS
(2021)
Article
Construction & Building Technology
Seunghwan Wi, Sungwoong Yang, Young Uk Kim, Yujin Kang, Sumin Kim
Summary: Traditionally, insulation materials were developed to prevent heat loss or gain in buildings, but they are flammable and emit harmful chemicals. This study evaluated the fire resistance performance of five insulation materials, with phenolic foam being the only one meeting the noncombustible grade criteria.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
Yujin Kang, Ho Hyen Jo, Sungwoong Yang, Seunghwan Wi, Sumin Kim
Summary: This study proposed a process for evaluating indoor hygrothermal performance using two different simulations and investigated the hygrothermal performance of the indoor environment based on the hygrothermal behavior of walls. The results showed that high relative humidity and water content were found inside wall and floor layers, and improving hygrothermal performance by changing building materials resulted in decreased heat and moisture fluxes.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Parth Bansal, Steven Jige Quan
Summary: This study investigates the relationship between urban form and canopy layer urban heat island (CUHI) using a relatively large sample of microclimate sensors in Seoul, Korea. The study compares different statistical models and finds that the spatially explicit gradient boosting decision tree (GBDT) model has the highest accuracy. The study also shows that the effect of urban form on CUHI varies at different time instances during the day. These findings provide valuable insights for planners to understand the complexity of urban climate and reduce CUHI magnitude.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Miaomiao Liu, Salah Almazmumi, Pinlu Cao, Carlos Jimenez-bescos, John Kaiser Calautit
Summary: Windcatchers provide effective low-energy ventilation and summer passive cooling in temperate climates. However, their use in winter is limited due to significant ventilation heat loss and potential discomfort. This study evaluates the applicability of windcatchers in low-temperature conditions, highlighting the need for control strategies to reduce over-ventilation and the integration of heat recovery or thermal storage to enhance winter thermal conditions.
BUILDING AND ENVIRONMENT
(2024)
Review
Construction & Building Technology
Behrouz Nourozi, Aneta Wierzbicka, Runming Yao, Sasan Sadrizadeh
Summary: This article presents a systematic review of ventilation solutions in hospital wards, aiming to enhance pathogen removal performance while maintaining patient and healthcare staff comfort using air-cleaning techniques. The study reveals the importance of proper ventilation systems in reducing infection risk and adverse effects of cross-contamination.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Zhen Yang, Weirong Zhang, Hongkai Liu, Weijia Zhang, Mingyuan Qin
Summary: The study examines the influence of personalized local heating on the thermal comfort of occupants in old residential buildings. The findings reveal that personalized local heating can increase the overall thermal sensation of occupants, but only a few methods are effective in enhancing thermal comfort. The chosen heating methods and background temperature affect the participants' selection of heating parts.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Hong Cheng, Dan Norback, Huilin Zhang, Liu Yang, Baizhan Li, Yinping Zhang, Zhuohui Zhao, Qihong Deng, Chen Huang, Xu Yang, Chan Lu, Hua Qian, Tingting Wang, Ling Zhang, Wei Yu, Juan Wang, Xin Zhang
Summary: The home environment and sick building syndrome (SBS) symptoms in five southern Chinese cities have been studied over time. The study found a decrease in asthma prevalence and an increase in allergic rhinitis. Cockroaches, rats, mice, mosquitoes or flies were identified as consistent biological risk factors for SBS symptoms, while redecoration, buying new furniture, and traffic air pollution were identified as other risk factors.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Chaojie Xing, Zhengtao Ai, Zhiwei Liu, Cheuk Ming Mak, Hai Ming Wong
Summary: This study experimentally investigated the emission characteristics of droplets around the mouth during dental treatments. The results showed that the peak mass fraction of droplets occurs within the size range of 20 μm to 100 μm, and droplets with a diameter less than 200 μm account for over 80% of the mass fraction. The dominant emission direction of droplets is towards the dummy's head and chest, forming an approximately cone shape.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Zhijian Liu, Zhe Han, Lina Hu, Chenxing Hu, Rui Rong
Summary: This study compared the effects of different respiratory behaviors on the distribution of aerosols in a ward and the risk of infection for healthcare workers using numerical simulation. It was found that talking in the ward significantly increased aerosol concentrations, particularly short periods of talking. Wards designed with side-supply ventilation had lower overall infection risk. Talking alternately between healthcare workers and patients slightly extended the impact time of aerosols.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yan Yan, Mengyuan Kang, Haodong Zhang, Zhiwei Lian, Xiaojun Fan, Chandra Sekhar, Pawel Wargocki, Li Lan
Summary: In a high-density city, opening windows for sleep may lead to increased indoor temperature, higher PM2.5 concentration, and noise disturbance, which can negatively impact sleep quality.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yan Bai, Liang Liu, Kai Liu, Shuai Yu, Yifan Shen, Di Sun
Summary: This study developed a non-intrusive personal thermal comfort model using machine learning techniques combined with infrared facial recognition. The results showed that the ensemble learning models perform better than traditional models, and the broad learning model has a higher prediction precision with lower computational complexity and faster training speed compared to deep neural networks. The findings provide a reference for optimizing building thermal environments.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yue Lei, Zeynep Duygu Tekler, Sicheng Zhan, Clayton Miller, Adrian Chong
Summary: Mixed-mode ventilation is a promising solution for achieving energy-efficient and comfortable indoor environments. This study found that occupants can thermally adapt when switching between natural ventilation (NV) and air-conditioning (AC) modes within the same day, with the adaptation process stabilizing between 35 to 45 minutes after the mode switch. These findings are important for optimizing thermal comfort in mixed-mode controls, considering the dynamic nature of thermal adaptation.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Nan Mo, Jie Han, Yingde Yin, Yelin Zhang
Summary: This study develops a method based on the LCZ framework for a comprehensive evaluation of urban-scale heat island effects, considering the impact of geographic factors on LST. The results show that Guilin's geomorphological conditions lead to abnormal heat island effects during winter, and the cooling effects of mountains and water bodies vary seasonally in different built areas, with LCZ 2 exhibiting the strongest cooling effect.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Tunga Salthammer
Summary: Monitoring the potential formaldehyde emission of wood-based materials through test chamber investigations has significantly contributed to reducing indoor formaldehyde concentrations. However, the different methodologies used in these procedures prevent direct result comparison. Empirical models for converting formaldehyde steady-state concentrations based on temperature, humidity, air change rate, and loading were developed in the 1970s and have been modified to accommodate the development of lower-emitting materials. Formaldehyde emissions from wood-based materials are complex and require nonlinear regression tools for mathematical analysis.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Katarina Stebelova, Katarina Kovacova, Zuzana Dzirbikova, Peter Hanuliak, Tomas Bacigal, Peter Hartman, Andrea Vargova, Jozef Hraska
Summary: This study investigated the impact of reduced short-wavelength light on the hormone melatonin metabolite 6-sulfatoxymelatonin (u-sMEL) and examined the association between previous day's light exposure and u-sMEL. It was found that reducing short-wavelength light during the day did not change the concentration of u-sMEL. Personal photopic illuminance was positively correlated with u-sMEL in the reference week. The illuminance had a significant impact on u-sMEL, as shown by the evaluation of the mean of all three urine samples. However, this correlation was not found in the experimental week.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Ruoxin Xiong, Ying Shi, Haoming Jing, Wei Liang, Yorie Nakahira, Pingbo Tang
Summary: This study proposes a data-model integration method to identify and calibrate uncertainties in machine learning models, leading to improved thermal perception predictions. The method utilizes the Multidimensional Association Rule Mining algorithm to identify biased human responses and enhances prediction accuracy and reliability. The study also evaluates different calibration techniques and discovers their potential in enhancing prediction reliability.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Beichao Hu, Zeda Yin, Abderrachid Hamrani, Arturo Leon, Dwayne McDaniel
Summary: This paper introduces an innovative super-resolution approach to model the air flow and temperature field in the cold aisle of a data center. The proposed method reconstructs a high-fidelity flow field by using a low-fidelity flow field, significantly reducing the computational time and enabling real-time prediction.
BUILDING AND ENVIRONMENT
(2024)
