Journal of building engineering最新文献

{"title":"An interlayer interleaved hybrid path to optimize performance of material extrusion additive manufacturing","authors":"Zhennan Wu, Xiaoyan Sun, Weiwei Dong, Hailong Wang","doi":"10.1016/j.jobe.2024.111586","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111586","url":null,"abstract":"The rapid expansion of material extrusion additive manufacturing (MEAM) has emphasized the importance of path-planning strategies for enhancing manufacturing efficiency and printing quality. However, current strategies are often deemed inefficient, inadequately adaptive, and mechanically weak. Additionally, existing studies generally overlook interlayer dissimilarity, leading to connected voids. To address these challenges, this paper proposes a novel multi-level hybrid path-planning strategy with an interlayer interleaving property. This approach utilizes a planar geometric processing algorithm that fills a pattern with inward-contour-parallel and zigzag paths, ensuring homogeneity and compactness. Global continuity is achieved through bridging paths based on curve containment, while a partitioning process based on medial-axis extraction minimizes defects between layers. Numerical and experimental results demonstrate that the proposed tool-path exhibits enhanced contour adaptability, integrity, and mechanical performance compared to common tool-paths. The study also analyses how tool-path planning influences the strength, ductility, and failure modes of specimens, providing valuable insights for MEAM and construction of durable and aesthetically pleasing buildings.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"3 12 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Building information modelling (BIM)-enabled facility management (FM) of nursing homes in China: A systematic review","authors":"Xiao Huan, Byung Gyoo Kang, Jing Xie, Craig Hancock","doi":"10.1016/j.jobe.2024.111580","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111580","url":null,"abstract":"China's aging population is increasing because of longer life expectancy and declining fertility rates. This demographic shift has increased the demand for eldercare facilities in China, making high-quality and efficient facility management (FM) a top priority for nursing home facility managers. Building information modelling (BIM) has been proposed as an effective means of improving work efficiency during nursing home operations and maintenance. This study explored the current strategies and approaches for integrating <ce:grant-sponsor sponsor- xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">BIM</ce:grant-sponsor> and <ce:grant-sponsor xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">FM</ce:grant-sponsor> into nursing homes to support the systematisation and intellectualisation of workflows during operations and maintenance. To achieve this goal, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) scheme was used for systematic evaluation. This systematic review searched scientific databases of related disciplines (e.g. Scopus, Web of Science, and the China National Knowledge Infrastructure [CNKI]) from January 2010 to March 2023, supplemented by manual retrieval methods. Among the 694 articles, 63 were analysed from four perspectives: 1) <ce:grant-sponsor xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">FM</ce:grant-sponsor> problems faced by nursing homes, 2) the benefit of using <ce:grant-sponsor sponsor- xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">BIM</ce:grant-sponsor> in <ce:grant-sponsor xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">FM</ce:grant-sponsor>, 3) the potential of <ce:grant-sponsor sponsor- xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">BIM</ce:grant-sponsor> applications to support nursing home <ce:grant-sponsor xlink:role=\"http://www.elsevier.com/xml/linking-roles/grant-sponsor\" xlink:type=\"simple\">FM</ce:grant-sponsor>, and 4) future research directions. This study addresses the research gap in the connection between BIM and FM in nursing homes through a comprehensive literature review and examines the challenges and benefits of BIM in nursing home operations. Additionally, this research contributes to the advancement of BIM applications in nursing home operations and maintenance, offering practical insights for industry decision-makers to meet the escalating demands of an aging society.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"102 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research progress of resourceful and efficient utilization of coal gangue in the field of building materials","authors":"Aiguo Wang, Yaohui Pan, Jun Zhao, Peng Liu, Yueming Wang, Yingjie Chu, Kaiwei Liu, Daosheng Sun","doi":"10.1016/j.jobe.2024.111526","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111526","url":null,"abstract":"Coal gangue is a carbonaceous rock discharged from coal mining and coal washing processes, an industrial solid waste in the coal mining industry. Coal gangue contains complex and diverse components, has low utilization rate and difficulty in compatibility between large-scale and high added value. Long term accumulation pollutes the environment. Safely, efficiently, and resourceful dispose and utilization of coal gangue have always been unavoidable issues for the high-quality development of the coal mining industry. Under the background of carbon neutrality and the development of green building industrialization, the efficient utilization of coal gangue resources in the field of building materials has broaden development space. The efficient utilization of coal gangue in the field of building materials should start from its composition, structure, and physical and chemical properties, and strengthen basic research on its application, in order to create efficient utilization pathways and mature technical means for the disposal of coal gangue solid waste in the building materials field. This article summarizes the latest research progress of coal gangue in the field of building materials, focusing on the high-value utilization technology of coal gangue in the preparation of concrete aggregates, cementitious materials (cement, active raw materials for geopolymer, etc.), and points out the existing problems in the utilization process of coal gangue and puts forward constructive suggestions. Perspectives are made for its future development and application prospects.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"76 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear transfer mechanism of headed stud connectors in engineered cementitious composites (ECC): Experimental observation, numerical investigation and analytical model","authors":"Jingting Lin, Bo Jiang, Dawei Gu, Junxiu Hu, Qianpeng He, Li Xu, Jinlong Pan","doi":"10.1016/j.jobe.2024.111565","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111565","url":null,"abstract":"Substituting normal concrete with engineered cementitious composites (ECC) is a promising way to address the cracking issue in steel-concrete composite structures. For realizing a synergetic deformation between ECC and steel, headed stud connectors can be incorporated to ensure an effective shear transfer along their interface. To understand the shear transfer mechanism of headed studs in ECC, a comprehensive experimental, numerical, and analytical approach is employed in this research. Firstly, a set of 13 push-out tests were carried out to explore the shear load-slip behavior of studs in ECC. Then, a parametric analysis was further conducted based on the finite element model to evaluate the influence of the diameter and length of stud, compressive strength of ECC, reinforcement ratio, and thickness of ECC layer. Finally, comprehensive analytical models for evaluating the shear carrying capacity, stiffness, and slipping ability of headed studs in ECC were established based on the elastic foundation beam model and regression analysis of experimental and numerical results.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"11 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of long-term water transport in cement paste considering the hydration process","authors":"Fangmei Huang, Xiancheng Li, Jiaping Liu, Rong Xian, Qian Tian, Zhangli Hu, Jun Xu","doi":"10.1016/j.jobe.2024.111558","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111558","url":null,"abstract":"The influence of hydration on water transport within cement paste is usually neglected, especially for the simulation. However, in low water-to-cement ratio cement paste cured underwater, hydration with the affected microstructure occurs along with the water transport and should be taken into account. In this study, the water absorption and hydration degree were monitored in cement pastes with ultra-low w/c cured under water for 360 days. The modified Krstulovic-Dabic model was established to simulate the hydration process of cement paste having low w/c cured in lime-saturated water considering the effect of water absorption and incomplete cement hydration. By calculating the saturation degree, porosity, and diffusion coefficient, the water transport process considering hydration was simulated. The simulation results were verified by the average saturation degree and <ce:sup loc=\"post\">1</ce:sup>H nuclear magnetic resonance relaxometry with water gradient quantification. The results show that the water content discrepancy between the surface and center of the specimen increased with decreasing w/c. Reasonable agreements between the experimental results and the simulated results can be observed in cement pastes having different w/c.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"143 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-healing of biochar-cement composites with crystalline admixture exposed to sulphate solution and simulated seawater","authors":"Xuqun Lin, Quang Dieu Nguyen, Arnaud Castel, Zhizhong Deng, Wengui Li, Vivian W.Y. Tam","doi":"10.1016/j.jobe.2024.111564","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111564","url":null,"abstract":"Although many studies considered crystalline admixtures (CA) as the self-healing agent, only limited studies investigated the potential effects of aggressive ions on the self-healing performance of marine structures. Furthermore, there is an increasing trend to use SCMs to improve concrete resilience while lowering carbon footprint. This study investigated the effects of CA and sustainable waste wood biochar (WWB) on the self-healing of cement pastes exposed to simulated seawater or 5 % sodium sulphate solution. Three-point loading was used to initiate the cracks while keeping the cracked samples unseparated. The healing rate was investigated using optical microscopy and binary image processing. The self-healing products characterisation was conducted using Scanned Electron Microscopy equipped with Energy dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), Thermogravimetric analysis (TG), and Fourier-transform Infrared Spectroscopy (FTIR). Cracks were completely healed after 42 days for CA-based samples when exposing to wet/dry cycles in seawater (SWWD) and sulphate solution (SWD). EDS, XRD and TG results confirmed the formation of calcite as the main healing products, while a small portion of brucite was observed in healing products for SWWD. FTIR spectra further confirmed the formation of C-S-H gel and AFt in healing productions exposed to SWWD and SWD. Although WWB addition did not improve healing performance of WWB-cement composites, it led to a relatively complex cracking path, providing more nucleation sites for the self-healing process.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"17 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combined effects of elevated temperature, sulfates and chlorides on performance of fly ash and metakaolin-based recycled aggregate geopolymer concrete","authors":"Ahmed A. Alawi Al-Naghi, Nejib Ghazouani, Abdellatif Selmi, Yasser Alashker, Ali Raza","doi":"10.1016/j.jobe.2024.111561","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111561","url":null,"abstract":"Previous studies have primarily focused on the effects of various supplementary cementitious materials (SCMs) on the mechanical and durability properties of geopolymers under isolated conditions such as elevated temperatures or sulfate exposure. However, the combined effects of fly ash (FA), metakaolin (MK), and recycled aggregates on geopolymers subjected to the simultaneous exposure of high temperatures, sodium sulfate, and sodium chloride have yet to be thoroughly investigated. Unlike earlier research, which tends to examine mechanical or chemical stressors in isolation, our study covers this gap by exploring the synergistic effects of these multiple stressors on key performance characteristics of FA- and MK-based geopolymer composites. This approach provides a more comprehensive understanding of the material's behavior in multi-stressor environments, closely replicating the complex conditions that real-world structures encounter. The present work investigates the mechanical, durability, and microstructural properties of recycled aggregate geopolymer concrete (RAGC) made with MK and FA, particularly under the influence of sulfate and salt following high-temperature exposure. To achieve this, five MK-based RAGC mixtures with varying FA contents were prepared. The samples were then subjected to elevated temperature in the range 200–800 °C. Afterward, the samples were immersed in 5 % sodium sulfate (SS) and 5 % sodium chloride (SC) solutions. The study assessed the effects of elevated temperatures combined with SS and SC on RAGC using mechanical strength, ultrasonic pulse velocity, mass loss measurements, capillary water absorption, scanning electron microscopy (SEM), X -ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). A statistical test was also performed to analyze the improvement in the results. Results showed that compressive strength increased with MK inclusion, achieving minimal losses even at high temperatures, with FMK-20, FMK-40, and FMK-60 showing only 11.65 %, 13.65 %, and 16.58 % losses at 200 °C. Capillary water absorption decreased with MK, with the FMK-20 blend showing a minimum absorption coefficient at 200 °C + SS. However, at 800 °C, absorption increased due to matrix degradation. After exposure to high temperatures with SS, crystalline formations like nepheline, quartz, calcite, and mullite were observed. Increased crystalline phases improved strength, but reduced quartz intensity and new cristobalite and anorthoclase phases appeared after high temperatures and SC. Conclusively, MK inclusion significantly improved RAGC's performance, particularly in elevated temperature and sulfate environments, confirming its potential for durable, high-strength concrete applications.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"116 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the factors influencing bending spalling failure in BFRP textile-reinforced concrete","authors":"Xiaofei Zhang, Xin Wang, Xunmei Liang, Yongwang Zhang, Zhishen Wu","doi":"10.1016/j.jobe.2024.111468","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111468","url":null,"abstract":"Textile-reinforced concrete (TRC), an innovative combination of fine-grained concrete and textile, facilitates the construction of thin, lightweight structures. Epoxy resin impregnation of textile is commonly applied to improve the mechanical properties of TRC, but it also increases the occurrence of spalling failure, which is not yet fully understood. This study investigates the effects of textile layer number, mesh size, surface treatment, and cover thickness on spalling failure through four-point bending tests conducted on basalt fiber reinforced polymer (BFRP) textile-reinforced concrete plates. The results showed that spalling failure compromised load-bearing capacity in post-cracking stage. Increasing the textile layers alleviated spalling damage and significantly improved ultimate bending stress, toughness, and crack development. Enlarging the textile mesh size effectively suppressed spalling failure, while excessively large mesh size inhibited multi-crack development and degrade flexural performance. Sand-coating treatment enhanced interfacial bonding and modified yarn cross-sectional shape, thereby reducing peeling cracks and improving flexural performance, particularly with fine sand. Similarly, fiber-coating treatments yielded improvements, attributed to enhance bonding and bridging effects of short fibers. In contrast, increasing cover thickness exacerbated spalling damage and decreased flexural capacity. Furthermore, spalling failure was preliminarily predicted based on the balance between spalling resistance and peeling force. These findings provide deeper insights into bending spalling failure and contribute to the development of limit state design for TRC structures.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"29 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of coupled environmental factors on shrinkage properties of concrete at high altitude","authors":"Hui Rong, Baoshan Wang, Jun bo Huang, Ye Shi, Xinguo Zheng","doi":"10.1016/j.jobe.2024.111560","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111560","url":null,"abstract":"In this paper, the shrinkage deformation of C35 and C50 concrete and its equivalent mortar by each factor under the complex coupling environment of low air pressure, large temperature difference, windy drying, and strong ultraviolet radiation is systematically studied by using an independently designed complex environment simulation platform. The effects of each environmental factor on the shrinkage and deformation, hydration degree and pore structure of concrete under the complex environment were analyzed. The results showed that the shrinkage deformation of concrete under the complex environment of plateau increased significantly, and the dominant factor was windy and dry, followed by low air pressure and ultraviolet radiation, and the temperature difference did not lead to further intensification of shrinkage. At the same time, the shrinkage deformation of concrete under plateau complex environment was closely related to the degree of hydration and pore structure. Compared with the standard curing environment, the plateau complex environment reduced the hydration degree of concrete and increased the number of various types of pore size, of which the effect of windy drying on the hydration degree of concrete and capillary pore content is particularly significant.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"21 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solidification performance and mechanism of C-S-H gel for Pb(II), Zn(II), and Cd(II)","authors":"Baomin Wang, Weigao Ding, Chengcheng Fan, Fei Liu, Wenxin Lu, Haoxiang Yang","doi":"10.1016/j.jobe.2024.111464","DOIUrl":"https://doi.org/10.1016/j.jobe.2024.111464","url":null,"abstract":"C-S-H gel is a complex cementitious system, and the properties present significant difference with various Ca/Si ratios. The immobilization mechanism of three heavy metals in C-S-H gel at various Ca/Si ratios was investigated in this work from the prospect of the physical adsorption and chemical immobilization. Results showed that higher Ca/Si ratios can result in an increase in silicon chain polymerization, and lower BET specific area, and C-S-H gel with various Ca/Si ratios showed the excellent immobilization for heavy metals. Pb(II) and Zn(II) can form hydroxyl complex polyhedra in C-S-H under strongly alkaline environments, and increase the silicon chain polymerization degree similar to the doping of C-S-H gel by Al. However, Cd(II) was immobilized in the C-S-H gel with the formation of a solid solution under the action of ion exchange with Ca(II), rather than in the form of hydroxyl complex polyhedral and cadmium hydroxide coprecipitates. The highest adsorption capacity of Pb(II) was realized in C-S-H gel with a Ca/Si molar ratio of 0.9, reaching 95.6006 mg/g. Pb(II) was mainly immobilized in C-S-H gel via physical and chemical adsorption, and the effect of chemical adsorption tended to be significant as the Ca/Si molar ratio increased. And the formation of Pb<ce:inf loc=\"post\">8</ce:inf>Ca(Si<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">7</ce:inf>)<ce:inf loc=\"post\">3</ce:inf> can be detected in C-S-H gel with a higher Ca/Si molar ratio.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"23 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}