Pub Date : 2024-01-09DOI: 10.3390/buildings14010161
Karan Moolchandani, Abhay Sharma, D. Kishan
In addressing the dual challenges of sustainable waste management and environmental conservation in the construction industry, particularly the disposal of waste tire crumb rubber (CR) and the demand for eco-friendly building materials, this study explores a novel solution. It examines the sustainable incorporation of waste tire crumb rubber and mineral additions—namely silica fume (SF), marble slurry powder (MSP), and fly ash (FA)—as partial substitutes for natural fine aggregates and cement in concrete. Through comprehensive testing of seventeen concrete samples, the study reveals that the specific mix of R10S5M10F15 that contained 10% crumb rubber as replacement of fine aggregates, and 5% silica fume, 10% marble slurry powder and 15% fly ash as replacements of cement, not only achieves compressive and split tensile strength comparable to the control mix, while the 90 days flexural strength was improved by 4.48%; credited to SF’s pozzolanic action and the filler effects of MSP and FA, but also that the inclusion of CR, while reducing compressive strength due to material variations, enhances ductility and improves resistance to sulfate and acid attacks, despite increasing water absorption. The primary goal of this research is to investigate the feasibility and effectiveness of using waste materials in concrete to foster more sustainable construction practices. The objectives include a detailed assessment of the mechanical properties and durability of concrete incorporating these waste materials, aiming to determine the optimal mix proportions for their effective utilization. This study’s novelty lies in its detailed analysis of the synergistic effects of combining CR, SF, MSP, and FA in concrete, contributing to the field by offering a sustainable alternative approach to traditional concrete formulations and highlighting the delicate balance required for optimized concrete performance.
为应对建筑行业可持续废物管理和环境保护的双重挑战，特别是废轮胎屑橡胶（CR）的处置和对环保建筑材料的需求，本研究探索了一种新的解决方案。该研究探讨了废轮胎碎屑橡胶和矿物添加剂（即硅灰（SF）、大理石浆粉（MSP）和粉煤灰（FA））在混凝土中部分替代天然细骨料和水泥的可持续掺入。通过对十七个混凝土样品的综合测试，研究发现，含有 10%碎石橡胶作为细骨料替代物，5%硅灰、10%大理石浆粉和 15%粉煤灰作为水泥替代物的 R10S5M10F15 特定混合料，不仅抗压强度和劈裂拉伸强度与对照混合料相当，而且 90 天抗弯强度提高了 4.48% ；这归功于 SF 的水青作用以及 MSP 和 FA 的填料效应，而且，加入 CR 虽然会因材料变化而降低抗压强度，但会增强延展性并提高抗硫酸盐和酸侵蚀的能力，尽管吸水率会增加。这项研究的主要目标是调查在混凝土中使用废料的可行性和有效性，以促进更可持续的建筑实践。目标包括详细评估掺入这些废料的混凝土的机械性能和耐久性，旨在确定有效利用这些废料的最佳混合比例。这项研究的新颖之处在于详细分析了混凝土中 CR、SF、MSP 和 FA 的协同效应，为该领域提供了传统混凝土配方的可持续替代方法，并强调了优化混凝土性能所需的微妙平衡。
{"title":"Enhancing Concrete Performance with Crumb Rubber and Waste Materials: A Study on Mechanical and Durability Properties","authors":"Karan Moolchandani, Abhay Sharma, D. Kishan","doi":"10.3390/buildings14010161","DOIUrl":"https://doi.org/10.3390/buildings14010161","url":null,"abstract":"In addressing the dual challenges of sustainable waste management and environmental conservation in the construction industry, particularly the disposal of waste tire crumb rubber (CR) and the demand for eco-friendly building materials, this study explores a novel solution. It examines the sustainable incorporation of waste tire crumb rubber and mineral additions—namely silica fume (SF), marble slurry powder (MSP), and fly ash (FA)—as partial substitutes for natural fine aggregates and cement in concrete. Through comprehensive testing of seventeen concrete samples, the study reveals that the specific mix of R10S5M10F15 that contained 10% crumb rubber as replacement of fine aggregates, and 5% silica fume, 10% marble slurry powder and 15% fly ash as replacements of cement, not only achieves compressive and split tensile strength comparable to the control mix, while the 90 days flexural strength was improved by 4.48%; credited to SF’s pozzolanic action and the filler effects of MSP and FA, but also that the inclusion of CR, while reducing compressive strength due to material variations, enhances ductility and improves resistance to sulfate and acid attacks, despite increasing water absorption. The primary goal of this research is to investigate the feasibility and effectiveness of using waste materials in concrete to foster more sustainable construction practices. The objectives include a detailed assessment of the mechanical properties and durability of concrete incorporating these waste materials, aiming to determine the optimal mix proportions for their effective utilization. This study’s novelty lies in its detailed analysis of the synergistic effects of combining CR, SF, MSP, and FA in concrete, contributing to the field by offering a sustainable alternative approach to traditional concrete formulations and highlighting the delicate balance required for optimized concrete performance.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"54 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010163
Yi Qian, Chuyue Huang, Beilin Han, Fan Cheng, Shengqiang Qiu, Hongyang Deng, Xiang Duan, Hengbin Zheng, Zhiwei Liu, Jie Wu
Bolted connections have become the most widely used connection method in steel structures. Over the long-term service of the bolts, loosening damage and other defects will inevitably occur due to various factors. To ensure the stability of bolted connections, an efficient and precise method for identifying loosened bolts in a given structure is proposed based on computer vision technology. The main idea of this method is to combine deep learning with image processing techniques to recognize and label the loosening angle from bolt connection images. A rectangular steel plate was taken as the test research object, and three grade 4.8 ordinary bolts were selected for study. The analysis was conducted under two conditions: manual loosening and simulated loosening. The results showed that the method proposed in this article could accurately locate the position of the bolts and identify the loosening angle, with an error value of about ±0.1°, which proves the accuracy and feasibility of this method, meeting the needs of structural health monitoring.
{"title":"Quantitative Analysis of Bolt Loosening Angle Based on Deep Learning","authors":"Yi Qian, Chuyue Huang, Beilin Han, Fan Cheng, Shengqiang Qiu, Hongyang Deng, Xiang Duan, Hengbin Zheng, Zhiwei Liu, Jie Wu","doi":"10.3390/buildings14010163","DOIUrl":"https://doi.org/10.3390/buildings14010163","url":null,"abstract":"Bolted connections have become the most widely used connection method in steel structures. Over the long-term service of the bolts, loosening damage and other defects will inevitably occur due to various factors. To ensure the stability of bolted connections, an efficient and precise method for identifying loosened bolts in a given structure is proposed based on computer vision technology. The main idea of this method is to combine deep learning with image processing techniques to recognize and label the loosening angle from bolt connection images. A rectangular steel plate was taken as the test research object, and three grade 4.8 ordinary bolts were selected for study. The analysis was conducted under two conditions: manual loosening and simulated loosening. The results showed that the method proposed in this article could accurately locate the position of the bolts and identify the loosening angle, with an error value of about ±0.1°, which proves the accuracy and feasibility of this method, meeting the needs of structural health monitoring.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"18 6","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010162
Meng Wu, Bin Wang, Qingxuan Shi, Wenzhe Cai
To investigate the effects of parameters on the seismic performance of slender T-shaped RC walls subjected to a biaxial seismic action, a numerical model was established using a fiber-based cross-section and displacement-based beam–column element. The axial load ratio, shear span ratio, flange width to web height ratio, concrete strength grade, stirrup ratio, and longitudinal reinforcement ratio were selected for the parametric study, and the effects of these parameters on the performance degradation under biaxial loading were investigated. Furthermore, a sensitivity analysis of various parameters for the decrease was conducted. The results showed that the bearing and deformation capacities under biaxial loading were both decreased, and the total energy consumption was greater than that under uniaxial loading. The impacts of different parameters and loading paths on the decrease extent were significantly different, and the overall reduction was greater in the flange direction than in the web direction. Under the square loading path, the T-shaped wall had the greatest reduction in its seismic performance, followed by the eight-shaped and cruciform loading paths. The changes in the axial load ratio, shear span ratio, and concrete strength significantly affected the performance degradation under biaxial loading. Accordingly, it is recommended to reasonably consider the values of these three parameters in a multidimensional seismic design to maintain safety redundancy.
为了研究参数对细长 T 型 RC 墙在双轴地震作用下抗震性能的影响，采用基于纤维的截面和基于位移的梁柱元素建立了数值模型。参数研究选取了轴荷载比、剪跨比、翼缘宽度与腹板高度比、混凝土强度等级、箍筋率和纵向配筋率，并研究了这些参数对双轴荷载作用下性能退化的影响。此外，还对各种参数的下降进行了敏感性分析。结果表明，双轴加载下的承载能力和变形能力均有所下降，总能耗大于单轴加载下的能耗。不同参数和加载路径对减小程度的影响存在显著差异，且翼缘方向的总体减小程度大于腹板方向。在方形加载路径下，T 型墙的抗震性能降低幅度最大，其次是八字形和十字形加载路径。轴向荷载比、剪跨比和混凝土强度的变化对双轴荷载下的性能降低有显著影响。因此，建议在多维抗震设计中合理考虑这三个参数的值，以保持安全冗余。
{"title":"Parametric Study on Seismic Performance of Slender T-Shaped RC Walls Subjected to Biaxial Loading","authors":"Meng Wu, Bin Wang, Qingxuan Shi, Wenzhe Cai","doi":"10.3390/buildings14010162","DOIUrl":"https://doi.org/10.3390/buildings14010162","url":null,"abstract":"To investigate the effects of parameters on the seismic performance of slender T-shaped RC walls subjected to a biaxial seismic action, a numerical model was established using a fiber-based cross-section and displacement-based beam–column element. The axial load ratio, shear span ratio, flange width to web height ratio, concrete strength grade, stirrup ratio, and longitudinal reinforcement ratio were selected for the parametric study, and the effects of these parameters on the performance degradation under biaxial loading were investigated. Furthermore, a sensitivity analysis of various parameters for the decrease was conducted. The results showed that the bearing and deformation capacities under biaxial loading were both decreased, and the total energy consumption was greater than that under uniaxial loading. The impacts of different parameters and loading paths on the decrease extent were significantly different, and the overall reduction was greater in the flange direction than in the web direction. Under the square loading path, the T-shaped wall had the greatest reduction in its seismic performance, followed by the eight-shaped and cruciform loading paths. The changes in the axial load ratio, shear span ratio, and concrete strength significantly affected the performance degradation under biaxial loading. Accordingly, it is recommended to reasonably consider the values of these three parameters in a multidimensional seismic design to maintain safety redundancy.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"20 8","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Using waste plastics in asphalt mixtures could be an exploratory way to dispose of waste plastics. This study aims to investigate the microscopic properties between asphalt and polyethylene (PE) at an extraordinary dosage of 20 wt.%. Various types of PE with different degrees of polymerization (DP) and structural configurations were considered. Molecular dynamics simulations were used to calculate the mechanical parameters, free volume ratio (FVR), and Flory–Huggins parameter of the resulting PE-modified asphalt (PEA). Two types of PEA were made and characterized by fluorescence microscopy. The simulation results indicate that the addition of PE reduces the density of modified asphalt by less than 5%, and a higher density of PEA is associated with a lower FVR. When the FVR is close, the mechanical properties are greatly influenced by the DP and configuration. The DP and the number of chains are the main parameters impacting the compatibility between PE and asphalt, based on the Flory–Huggins parameter analysis. Decreasing the DP of PE (e.g., 50, with a minimum Flory–Huggins parameter and a relative molecular mass of 1300) will significantly increase the compatibility between asphalt and PE. LDPE−2 has better compatibility with asphalt, possibly because LDPE−2 has higher purity. These findings provide valuable insights into plastic thermal cracking and industrial modification practices.
{"title":"Microscopic Properties of Asphalt and Polyethylene at an Extraordinary High Dosage through Molecular Dynamics Simulation","authors":"Yuye Jin, Haoyi Li, Jie Chen, Qianqian Wang, Yanhua Bao, Shuguang Hou","doi":"10.3390/buildings14010164","DOIUrl":"https://doi.org/10.3390/buildings14010164","url":null,"abstract":"Using waste plastics in asphalt mixtures could be an exploratory way to dispose of waste plastics. This study aims to investigate the microscopic properties between asphalt and polyethylene (PE) at an extraordinary dosage of 20 wt.%. Various types of PE with different degrees of polymerization (DP) and structural configurations were considered. Molecular dynamics simulations were used to calculate the mechanical parameters, free volume ratio (FVR), and Flory–Huggins parameter of the resulting PE-modified asphalt (PEA). Two types of PEA were made and characterized by fluorescence microscopy. The simulation results indicate that the addition of PE reduces the density of modified asphalt by less than 5%, and a higher density of PEA is associated with a lower FVR. When the FVR is close, the mechanical properties are greatly influenced by the DP and configuration. The DP and the number of chains are the main parameters impacting the compatibility between PE and asphalt, based on the Flory–Huggins parameter analysis. Decreasing the DP of PE (e.g., 50, with a minimum Flory–Huggins parameter and a relative molecular mass of 1300) will significantly increase the compatibility between asphalt and PE. LDPE−2 has better compatibility with asphalt, possibly because LDPE−2 has higher purity. These findings provide valuable insights into plastic thermal cracking and industrial modification practices.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"11 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on the engineering background of weakly cemented roadways and adjacent chambers in Western China, a numerical simulation method was used to examine the changes in stress distribution and increment in the surrounding rock of weakly cemented roadways adjacent to chambers. The results show that the surrounding rock stress of the weakly cemented roadway adjacent to the chambers increases by approximately 30%. The vertical stress of the surrounding rock mainly expands along the vertical direction, and the expansion range is 7–12 times that of the chamber height. The horizontal stress of the surrounding rock mainly expands along the horizontal direction, and the expansion range is 3–6 times that of the chamber width. Based on the support idea of “allowable deformation” + “relief pressure” + “maintaining roadway shape”, the support technology of weakly cemented roadways adjacent to chambers is established with “full section U-shaped steel shed + filling flexible materials between the steel shed and surrounding rock + patching the roof bolt + laying concrete on floor”. An engineering test based on the above support technology was carried out, and it was found that the deformation of the weakly cemented roadway adjacent to the chambers was 0 in 20 days.
{"title":"Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers","authors":"Yueying Zhang, Dongxiao Zhang, Xufei Gong, Wei Zhang, Zihao Liu, Feng Xiong","doi":"10.3390/buildings14010169","DOIUrl":"https://doi.org/10.3390/buildings14010169","url":null,"abstract":"Based on the engineering background of weakly cemented roadways and adjacent chambers in Western China, a numerical simulation method was used to examine the changes in stress distribution and increment in the surrounding rock of weakly cemented roadways adjacent to chambers. The results show that the surrounding rock stress of the weakly cemented roadway adjacent to the chambers increases by approximately 30%. The vertical stress of the surrounding rock mainly expands along the vertical direction, and the expansion range is 7–12 times that of the chamber height. The horizontal stress of the surrounding rock mainly expands along the horizontal direction, and the expansion range is 3–6 times that of the chamber width. Based on the support idea of “allowable deformation” + “relief pressure” + “maintaining roadway shape”, the support technology of weakly cemented roadways adjacent to chambers is established with “full section U-shaped steel shed + filling flexible materials between the steel shed and surrounding rock + patching the roof bolt + laying concrete on floor”. An engineering test based on the above support technology was carried out, and it was found that the deformation of the weakly cemented roadway adjacent to the chambers was 0 in 20 days.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"16 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010167
Carlos Arévalo Sarrate, Javier Tarín Martínez, Antonio Lorenzo Lara Galera, Rubén Ángel Galindo Aires
Management systems that are recognized as key tools to improve business management and the results associated with it have spread at the business level during the last 50 years. Regarding Safety Management Systems (SMSs), despite having specific international standards, there are no complete studies that analyze the degree of effectiveness of SMS, and even less in construction, a sector that concentrates a large part of registered labor accidents worldwide. The present investigation is an analysis of SMS effectiveness from an empirical study carried out over 48 months in five countries with a total of more than 23 million work hours between 2009 and 2012. Additionally, it is implied that the impact of SMS implementation in a certain organization must be complemented by a statistical qualitative analysis of its effect on the distribution of accidents. Both analyses are developed in the present study, thus contributing relevant implications when assessing both quantitatively and qualitatively the effects of developing and implementing a health and safety management system in this sector. The findings from this research can contribute to understanding how SMS implementation can help reduce accidents in this industry as well as to enhance SMS implementation in a high-risk sector.
{"title":"Effect of Health and Safety Management Systems in the Construction Sector","authors":"Carlos Arévalo Sarrate, Javier Tarín Martínez, Antonio Lorenzo Lara Galera, Rubén Ángel Galindo Aires","doi":"10.3390/buildings14010167","DOIUrl":"https://doi.org/10.3390/buildings14010167","url":null,"abstract":"Management systems that are recognized as key tools to improve business management and the results associated with it have spread at the business level during the last 50 years. Regarding Safety Management Systems (SMSs), despite having specific international standards, there are no complete studies that analyze the degree of effectiveness of SMS, and even less in construction, a sector that concentrates a large part of registered labor accidents worldwide. The present investigation is an analysis of SMS effectiveness from an empirical study carried out over 48 months in five countries with a total of more than 23 million work hours between 2009 and 2012. Additionally, it is implied that the impact of SMS implementation in a certain organization must be complemented by a statistical qualitative analysis of its effect on the distribution of accidents. Both analyses are developed in the present study, thus contributing relevant implications when assessing both quantitatively and qualitatively the effects of developing and implementing a health and safety management system in this sector. The findings from this research can contribute to understanding how SMS implementation can help reduce accidents in this industry as well as to enhance SMS implementation in a high-risk sector.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"13 2","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010165
A. Laouadi, Lili Ji, Zahra Jandaghian, Michael A. Lacasse, L. Wang
Overheating in school buildings can negatively affect the cognitive learning performance of particularly young students whose thermoregulation systems are still developing. However, currently, in schools, issues related to overheating have been addressed by limiting the exposure time to thermal discomfort. In this paper, the development of a general procedure that combines building and bioheat simulations to evaluate overheating risk in schools and generate health-based overheating limit criteria that may be applied in Canadian schools is described. General school building models, having either old or new constructions, were created based on a primary school building and successfully calibrated using field measurements of indoor temperature and humidity and published building energy use intensity data. Three sets of two limit criteria (exposure duration and severity of overheating) that account for the personal exposure conditions of students in primary, middle, and secondary schools were developed by limiting the body dehydration of students during extreme overheating events. Comparing the proposed limit criteria with the hour of exceedance criterion revealed interesting relationships between them, suggesting the proposed limit criteria as a benchmark for the comfort-based criteria, particularly for the more vulnerable primary and middle schools. The proposed procedure with the obtained overheating limit criteria is intended to be applied in any field or simulation study to assess the risk of overheating in similar school buildings under any local prevailing climate.
{"title":"The Development of Health-Based Overheating Limit Criteria for School Buildings","authors":"A. Laouadi, Lili Ji, Zahra Jandaghian, Michael A. Lacasse, L. Wang","doi":"10.3390/buildings14010165","DOIUrl":"https://doi.org/10.3390/buildings14010165","url":null,"abstract":"Overheating in school buildings can negatively affect the cognitive learning performance of particularly young students whose thermoregulation systems are still developing. However, currently, in schools, issues related to overheating have been addressed by limiting the exposure time to thermal discomfort. In this paper, the development of a general procedure that combines building and bioheat simulations to evaluate overheating risk in schools and generate health-based overheating limit criteria that may be applied in Canadian schools is described. General school building models, having either old or new constructions, were created based on a primary school building and successfully calibrated using field measurements of indoor temperature and humidity and published building energy use intensity data. Three sets of two limit criteria (exposure duration and severity of overheating) that account for the personal exposure conditions of students in primary, middle, and secondary schools were developed by limiting the body dehydration of students during extreme overheating events. Comparing the proposed limit criteria with the hour of exceedance criterion revealed interesting relationships between them, suggesting the proposed limit criteria as a benchmark for the comfort-based criteria, particularly for the more vulnerable primary and middle schools. The proposed procedure with the obtained overheating limit criteria is intended to be applied in any field or simulation study to assess the risk of overheating in similar school buildings under any local prevailing climate.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"59 21","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-09DOI: 10.3390/buildings14010159
R. Abidoye, Albert Agbeko Ahiadu, Mustapha Bangura, C. Adilieme, T. Oyedokun, Abood Khaled Alamoudi
The work readiness of property graduates is the subject of global discourse and is an increasingly critical gap as employers demand professionals with competencies in their fundamental roles and digital technologies. Although these issues have been explored from the perspectives of students, graduates, and employers, the insights of property academics remain unexplored. As such, this study delved into the challenges encountered by property academics in Australia concerning the training of property graduates for the digital age, as well as the efficacy of strategies used to achieve this. The opinions of 22 property academics were gathered through an online questionnaire survey and analysed through mean scores, relative importance index (RII), and exploratory factor analysis (EFA). The profile of respondents suggests that approximately half of them have no more than five years of industry experience, and only 54.5% currently engage with the industry. The most significant challenges include limited funding to procure bespoke software and insufficient time to achieve digital competency. Furthermore, academics cited limited support from the universities as a key challenge, but rated curriculum rigidity as non-pertinent. Regarding strategies, retraining academics for digital proficiency, increased technical support from universities, adopting active learning, and revising curricula to incorporate digital technology are critical. Collaboration with industry partners and increased funding for software procurement also emerged as key external factors. Variations in these perceptions also suggest that older academics are less receptive towards retraining, academics with more industry experience believe that a restructuring of the curricula is required, and smaller institutions require more funding and industry support. The core themes of the proposed strategies also indicate that holistic curricula integration is required to incorporate the perspectives of all stakeholders. Practically, these findings underscore the pivotal role of academics in bridging the skills gap and the interconnected roles of graduates, universities, and industry partners.
{"title":"Preparing Property Graduates for the Digital Age: Challenges and Strategies from the Perspective of Australian Property Educators","authors":"R. Abidoye, Albert Agbeko Ahiadu, Mustapha Bangura, C. Adilieme, T. Oyedokun, Abood Khaled Alamoudi","doi":"10.3390/buildings14010159","DOIUrl":"https://doi.org/10.3390/buildings14010159","url":null,"abstract":"The work readiness of property graduates is the subject of global discourse and is an increasingly critical gap as employers demand professionals with competencies in their fundamental roles and digital technologies. Although these issues have been explored from the perspectives of students, graduates, and employers, the insights of property academics remain unexplored. As such, this study delved into the challenges encountered by property academics in Australia concerning the training of property graduates for the digital age, as well as the efficacy of strategies used to achieve this. The opinions of 22 property academics were gathered through an online questionnaire survey and analysed through mean scores, relative importance index (RII), and exploratory factor analysis (EFA). The profile of respondents suggests that approximately half of them have no more than five years of industry experience, and only 54.5% currently engage with the industry. The most significant challenges include limited funding to procure bespoke software and insufficient time to achieve digital competency. Furthermore, academics cited limited support from the universities as a key challenge, but rated curriculum rigidity as non-pertinent. Regarding strategies, retraining academics for digital proficiency, increased technical support from universities, adopting active learning, and revising curricula to incorporate digital technology are critical. Collaboration with industry partners and increased funding for software procurement also emerged as key external factors. Variations in these perceptions also suggest that older academics are less receptive towards retraining, academics with more industry experience believe that a restructuring of the curricula is required, and smaller institutions require more funding and industry support. The core themes of the proposed strategies also indicate that holistic curricula integration is required to incorporate the perspectives of all stakeholders. Practically, these findings underscore the pivotal role of academics in bridging the skills gap and the interconnected roles of graduates, universities, and industry partners.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"118 21","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-08DOI: 10.3390/buildings14010151
Jiayan Zheng, Yan Liu, Renwei Luo, Haijing Liu, Zhixiang Zhou, Ji He
To improve the accuracy of concrete crack measurement with a machine vision method in structural health monitoring and in technical status evaluation, a subpixel crack measurement method based on the partial area effect was proposed. (1) First, a pixelwise crack image segmentation method was established through a multi-step process of multi-threshold fusion and morphology operation, and a novel pixel degree crack width calculation method was developed with the extraction of the middle points, the center line and its normal, and the intersection of the center line normal and crack edges. (2) Then, a subpixel algorithm based on the partial area effect was introduced to locate vertical, horizontal, and oblique cracks in subpixel crack edges, and the subpixel crack width could be calculated along the crack center line pixelwise. (3) Finally, the proposed method was verified by indoor concrete beam crack measurement tests with a digital microscope, and the results show that the maximum relative errors of the subpixel width of the horizontal, vertical, and oblique straight cracks measured by the proposed method were 3.06%, 8.97%, and 5.16%, respectively. The absolute error of the crack length was less than 0.30 mm, and the measurement accuracy could reach 0.01 pixels. The subpixel crack measurement method provides a novel possible solution for structural health monitoring.
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Pub Date : 2024-01-08DOI: 10.3390/buildings14010154
Jingxian Liu, Yingyu Wu, Fulin Qu, Hanbing Zhao, Yilin Su
The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.
水泥行业错综复杂的生产工艺（包括窑炉加热和化石燃料的使用）造成的二氧化碳排放量占全球总量的 5-8%，是建筑业的重要碳排放源。本研究通过利用酚酞法和热重法来量化混合水泥系统中的二氧化碳捕集潜力。其主要目的是评估这些混合体系浆料的二氧化碳吸收能力。初步评估包括计算水泥浆中的碳捕获能力，随后扩展到估算最终混凝土产品中的二氧化碳含量。研究结果表明，掺入磨细高炉矿渣（GGBS）或基于乙曲石的膨胀剂，无论其细度如何，都不会显著提高碳化深度。相反，粉煤灰（FA）的引入则显著提高了碳化深度，使捕获的二氧化碳含量大幅提高了 36.4%。观察到的碳化行为差异主要源于孔隙结构的不同，这可归因于 GGBS 和 FA 之间不同的水化特性。热分析证实了二氧化碳在 FA 混合物中的稳定性提高，突出了材料成分对碳化和减排的重要影响。同时掺入 GGBS 和 FA 可显著减少粘结剂的排放量，几乎占 PC 混凝土排放量的一半。最初，60% 的 GGBS 比 50% 的 FA 排放量低，但当考虑到二氧化碳捕获时，这种排放动态发生了显著变化，强调了添加剂对排放模式的复杂影响。这凸显了评估水泥基系统中碳化引起的排放的复杂性。
{"title":"Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products","authors":"Jingxian Liu, Yingyu Wu, Fulin Qu, Hanbing Zhao, Yilin Su","doi":"10.3390/buildings14010154","DOIUrl":"https://doi.org/10.3390/buildings14010154","url":null,"abstract":"The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.","PeriodicalId":48546,"journal":{"name":"Buildings","volume":"52 2","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139447892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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