Liufeng Su , Xue Li , Qixiang Yan , Yong Yao , Yongjun Deng , Ming Li
{"title":"Experimental and numerical analysis of wind load distribution on large-span double-curved spherical shell roofs under downburst conditions: Terrain effects and radial position sensitivity","authors":"Liufeng Su , Xue Li , Qixiang Yan , Yong Yao , Yongjun Deng , Ming Li","doi":"10.1016/j.dibe.2025.100767","DOIUrl":"10.1016/j.dibe.2025.100767","url":null,"abstract":"<div><div>This study systematically investigated the influence of downbursts on the wind load distribution of large-span hyperbolic spherical roofs under different terrain conditions through the design of scaled models, combined with wind tunnel experiments and Computational Fluid Dynamics (CFD) numerical simulations. The results indicate that when the downburst core acts directly above the model, the upper roof surface experiences significant vertical impact loads, with an average wind pressure coefficient (<em>C</em><sub><em>p</em></sub>) reaching 1.0 and exhibiting a radial decrease, while the lower roof surface shows a slightly lower <em>C</em><sub><em>p</em></sub> (0.8–0.9) but with a uniform distribution. Under flat terrain conditions, as the radial distance increases (≥1.25<em>D</em><sub><em>jet</em></sub>), the Cp on the upper roof surface decays to a stable value (≈0.6), while the <em>C</em><sub><em>p</em></sub> on the windward side of the lower roof surface decreases linearly with minimal change on the leeward side, and a localized high-speed zone appears at 1.25<em>D</em><sub><em>jet</em></sub>. In contrast, under sloped terrain conditions, the <em>C</em><sub><em>p</em></sub> on the upper roof surface turns negative with an increasing absolute value, while the <em>C</em><sub><em>p</em></sub> on the windward side of the lower roof surface transitions from positive to negative, with the maximum negative pressure zone located at the edge. The CFD velocity contour lines validated the surface pressure distribution, demonstrating a high degree of consistency between the numerical and experimental data, thereby providing a reliable basis for related research.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100767"},"PeriodicalIF":8.2,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221954","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}
Jin-Seok Choi , Hyung-Bae Kim , Doo-Yeol Yoo , Kyung-Hwan Min , Young-Soo Yoon
{"title":"Early-age durability and semi-destructive strength evaluation of rapid-hardening latex-modified concrete overlays","authors":"Jin-Seok Choi , Hyung-Bae Kim , Doo-Yeol Yoo , Kyung-Hwan Min , Young-Soo Yoon","doi":"10.1016/j.dibe.2025.100768","DOIUrl":"10.1016/j.dibe.2025.100768","url":null,"abstract":"<div><div>This study investigates the early-age durability and strength of rapid-hardening latex-modified concrete (LMC) overlays, with a focus on field-applicable semi-destructive testing. Five mixtures using acrylic and styrene-butadiene rubber (SBR) latexes were tested for compressive strength, freeze–thaw resistance, and abrasion at early ages. All mixtures retained over 80 % of dynamic modulus after 300 freeze–thaw cycles, and abrasion resistance improved after 4 h. Break-off and pull-out tests were conducted in laboratory and field conditions to evaluate in-situ strength. The pull-out test showed R<sup>2</sup> = 0.8857 correlation with compressive strength across insert sizes and ages, while the break-off test showed depth sensitivity and reduced reliability. A log-transformed orthogonal regression model based on lab pull-out data was applied to field results, enabling strength prediction without core testing. The findings confirm that rapid-hardening LMC overlays achieved sufficient early durability and strength, and that the pull-out method was a practical tool for early-age quality control in concrete repair.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100768"},"PeriodicalIF":8.2,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221953","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}
Guofu Chen , Tingshu He , Xiaodong Ma , Renhe Yang , Yongqi Da
{"title":"Utilization of xoal gangue and waste incineration fly ash under high temperature sintering in cementitious materials: Physico-Mechanical properties and hydration products","authors":"Guofu Chen , Tingshu He , Xiaodong Ma , Renhe Yang , Yongqi Da","doi":"10.1016/j.dibe.2025.100765","DOIUrl":"10.1016/j.dibe.2025.100765","url":null,"abstract":"<div><div>Coal gangue (CG) and Waste incineration fly ash (WIFA) are the main solid waste in China. In order to value-added utilization of both solid waste types, while achieving effective consolidation of harmful substances in WIFA. In this study, CG and WIFA were calcined at different temperatures and blending to obtain CG-WIFA, which will be used as a substitute for cement to prepare cement-based materials. Firstly, the phase composition and microstructure of CG-WIFA were analyzed. Then, the flowability, mechanical properties, and pozzolanic activity of the mortar prepared by CG-WIFA were analyzed. Finally, X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), and mercury intrusion porosimetry (MIP) were employed to investigate the hydration degree and pore structure evolution of cement incorporated with CG-WIFA. The results showed that the roundness of CG-WIFA increased at calcination temperatures above 1000 °C, and the slump of 1200CG-20WIFA reached 225 mm, an increase of 10.8 % compared to C. The pozzolanic activities of 700CG-0WIFA and 800CG-0WIFA were measured as 70.9 % and 74.6 %, respectively. Upon compounding with 20 % WIFA, these values increased to 88.3 % and 80.2 %. The addition of WIFA accelerated the hydration reaction of C<sub>3</sub>S and C<sub>2</sub>S in the cement, and refined the pore size of the cement.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100765"},"PeriodicalIF":8.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159130","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}
Aaditya Bikram Chand , R.C. Kshitiz , Sabin Dulal , Yagyamani Rijal , Rahesh Hari , Mini K. Madhavan
{"title":"Effect of normal and PCE-Modified C-S-H seeds on cement paste properties: A statistical approach using local polynomial regression and functional ANOVA","authors":"Aaditya Bikram Chand , R.C. Kshitiz , Sabin Dulal , Yagyamani Rijal , Rahesh Hari , Mini K. Madhavan","doi":"10.1016/j.dibe.2025.100764","DOIUrl":"10.1016/j.dibe.2025.100764","url":null,"abstract":"<div><div>Calcium silicate hydrate (C-S-H) seeds have emerged as a viable option for accelerators in concrete. The study investigates influence of synthetic C-S-H nanoparticles, unmodified (Normal_CSH) and polycarboxylate ether-modified (PCE_CSH), on setting behaviour, workability, strength development, and shrinkage characteristics of cementitious systems. Rice husk ash and carbide slag, two industrial waste materials, are used as sources of silicon and calcium for synthesis of C-S-H. Local Polynomial Regression and Functional ANOVA employed to statistically model and interpret effects of C-S-H. Compressive strength at 1, 3, 7, 28 days showed that both C-S-H types improve early-age strength, with peak gains up to 79 % at 2 % PCE_CSH. Optimal strength performance occurred within 1.3 %–2.5 % dosage, beyond which agglomeration effects limited further gains. Increased early-age shrinkage was observed, attributed to accelerated hydration, microstructural densification, and internal self-desiccation. The study establishes C-S-H, particularly PCE-modified form, as a promising additive for enhancing early performance in cement-based materials.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100764"},"PeriodicalIF":8.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221955","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}
Xinyu Fan, Xuxu Yang, Feifei Hou, Cuipu Xi, Yijun Wang
{"title":"Track foreign object image augmentation based on the proposed PLCA-pix2pixGAN method","authors":"Xinyu Fan, Xuxu Yang, Feifei Hou, Cuipu Xi, Yijun Wang","doi":"10.1016/j.dibe.2025.100754","DOIUrl":"10.1016/j.dibe.2025.100754","url":null,"abstract":"<div><div>The presence of foreign objects on railway tracks poses serious safety risks and may lead to accidents or service disruptions. However, existing detection systems based on deep learning are often constrained by small datasets, limited sample diversity, and low realism in synthesized training images. To address these issues, this paper proposes PLCA-pix2pixGAN (Perceptual Loss and Channel Attention Enhanced pix2pix GAN) to generate high-quality synthetic images for data augmentation. The method overlays object templates onto real-world track images to build a composite dataset and applies interpretable augmentation to simulate lighting and weather changes. To enhance fidelity, a channel attention mechanism enables region-aware reconstruction, and a multi-objective loss combines perceptual loss with adaptive weighting to balance pixel-level accuracy and semantic consistency. Experiments show the proposed method achieves an average SSIM of 0.9106 across object categories, demonstrating its effectiveness in generating realistic, structurally consistent images for safety-critical foreign object detection in railway systems.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100754"},"PeriodicalIF":8.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159129","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":"Exploring the impact of emissivity and orientation of fully glazed facades on urban microclimates","authors":"Elham Sanagar Darbani, Ehsan Sharifi, Veronica Soebarto","doi":"10.1016/j.dibe.2025.100758","DOIUrl":"10.1016/j.dibe.2025.100758","url":null,"abstract":"<div><div>Fully glazed façades are increasingly common in modern architecture, yet their influence on outdoor conditions remains underexplored. This study examines how glass emissivity (0.84, 0.5, 0.3, 0.07) and façade orientation (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) affect mean radiant temperature and longwave radiation at a site in Adelaide, South Australia. Using ENVI-met (V5.6.1), 64 simulations were run for the city's hottest and coldest days. Results show that higher-emissivity façades increase MRT and LW Rad, particularly in summer. MRT emerged as the most sensitive parameter to emissivity changes, with seasonal variation affecting comfort. In winter, higher emissivity slightly improves conditions, while in summer, lower emissivity enhances outdoor environment. Façade orientations of 0°, 225°, 270°, and 315° were linked to the highest MRT and LW Rad values. These findings underscore the importance of façade materials and orientation in shaping outdoor microclimates and offer valuable insights into climate-sensitive urban design.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100758"},"PeriodicalIF":8.2,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119540","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":"Unraveling household energy service relevant resilience behaviors for natural disasters: Perspective of extended protection motivation theory","authors":"Biao Kuang , Yuqing Hu , Jianli Chen","doi":"10.1016/j.dibe.2025.100763","DOIUrl":"10.1016/j.dibe.2025.100763","url":null,"abstract":"<div><div>Households need to implement preventive measures to prepare for increasing natural disasters, yet research on investigating and explaining energy-related resilience behaviors remains limited. This survey-based study examines household intentions toward energy resilience behaviors: (1) proactive measures, including structural (e.g., upgrading homes/appliances) and emergency actions (e.g., securing backup energy), and (2) reactive (avoidance) measures, i.e., reducing energy use during disasters. Using an extended Protection Motivation Theory framework and structural equation modeling, this paper reveals that households have lower intentions toward proactive measures than reactive measures. Threat appraisal (i.e., perceived severity and vulnerability) significantly increases behavioral intentions, while perceived cost or discomfort consistently reduces them. In contrast, response efficacy, defined as perceived effectiveness of actions, only significantly influences reactive measures. More importantly, self-efficacy, as the perceived ability to perform preventive behaviors, is the key determinant of proactive actions (β = 0.39 or 0.62), while energy-saving knowledge predominantly drives reactive behaviors (β = 0.39). Furthermore, response knowledge, reinforced by external support, enhances behavioral intentions both directly and indirectly by strengthening self-efficacy. These findings underscore improving knowledge of resilience behaviors and expanding social support to enhance household preparedness and maintain essential energy services during disasters.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100763"},"PeriodicalIF":8.2,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159128","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":"Cost-effective indoor air quality monitoring in schools: in-field calibration of PM low-cost sensor","authors":"J.P. Sá, H. Chojer, P.T.B.S. Branco, M.C.M. Alvim-Ferraz, F.G. Martins, S.I.V. Sousa","doi":"10.1016/j.dibe.2025.100762","DOIUrl":"10.1016/j.dibe.2025.100762","url":null,"abstract":"<div><div>The availability of low-cost sensors (LCS) devices for indoor air monitoring has boosted air pollution field. This study aims to calibrate particulate matter (PM) LCS (PM<sub>1</sub>, PM<sub>2.5</sub> and PM<sub>10</sub>) in four age groups/types of rooms (infants, preschoolers, schoolers and lunchroom) during occupancy and non-occupancy period in nursery and primary schools in Porto, considering the purpose of being used as a tool to empower schools to apply indoor air pollution (IAP) mitigation measures.</div><div>Sixteen LCS devices (AirVisual Pro) and three research-grade instruments (DustTrak DRX 8534/8533) were used to monitor PM in around 130 different samplings. Before calibration, a methodology approach based on local maxima was applied to all PM fractions of LCS data, since various error events were found. Thus, after identifying and removing these events, a merged dataset was created using 1-min mean of LCS and reference data. Calibration models were applied, such as simple and multiple linear regressions (LR and MLR), linear and non-linear support vector regression (SVR) and gradient boosting regression (GBR).</div><div>A strong linear relationship was observed between LCS device and reference data, especially for non-occupancy period and in finer PM fractions (Pearson's correlation reached 0.94 for PM<sub>1</sub> and PM<sub>2.5</sub>). While PM<sub>10</sub> exhibited a slightly weaker correlation than the other PM fractions. The calibration models, particularly SVR and GBR models, significantly improved the results depending on the PM fraction, age group/type of room and occupancy pattern. Overall, results indicated that LCS devices are an effective tool for managing IAQ in schools, based on PM sensor.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100762"},"PeriodicalIF":8.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221952","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}
Yunlong Song , Jingzhe Kang , Yumeng Su , Shiying Zhang , Qi Zhang , Youling Yu , Zhaomin Zhan , Weiping Zhang
{"title":"MambaFuse: Cross-scale state space fusion for crack segmentation","authors":"Yunlong Song , Jingzhe Kang , Yumeng Su , Shiying Zhang , Qi Zhang , Youling Yu , Zhaomin Zhan , Weiping Zhang","doi":"10.1016/j.dibe.2025.100751","DOIUrl":"10.1016/j.dibe.2025.100751","url":null,"abstract":"<div><div>The detection of cracks on the surface of infrastructure structures is a critical component of structural health monitoring. Addressing the core challenge of insufficient long-range dependency modeling in low-resolution crack detection, this paper proposes MambaFuse, a novel multilevel encoder–decoder model. This framework innovatively integrates the local feature extraction capability of CNNs, the global modeling strength of Transformers, and the long-sequence processing characteristics of Mamba. Field tests based on an autonomous mobile detection platform confirm the model’s exceptional ability to maintain crack topological continuity in real-time detection, with its selective state space mechanism successfully resolving fracture issues commonly encountered in dynamic mobile imaging. To advance research in this field, we constructed the CrackBench benchmark dataset containing 1,000 annotated images from multiple scenarios, and developed a geometry-based crack quantification method that enables direct conversion from pixel-level detection to engineering-applicable quantitative metrics. Experimental results demonstrate state-of-the-art performance in multiple benchmark datasets: 90.04% mIoU on DeepCrack, 79. 58% mIoU on Crack500 and 86. 17% mIoU on CrackBench, validating its superior segmentation accuracy and cross-scenario robustness.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100751"},"PeriodicalIF":8.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097641","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}
Balamurali Kanagaraj , Tattukolla Kiran , N. Anand , G. Jayakumar , Eva Lubloy
{"title":"Bamboo reinforced panels with recycled concrete aggregates: A comparative study between cement and geopolymer concrete","authors":"Balamurali Kanagaraj , Tattukolla Kiran , N. Anand , G. Jayakumar , Eva Lubloy","doi":"10.1016/j.dibe.2025.100753","DOIUrl":"10.1016/j.dibe.2025.100753","url":null,"abstract":"<div><div>The present study examines the behavior of bamboo-reinforced concrete slabs with two distinct concrete types (cement concrete and geopolymer concrete (GPC)) under the influence of recycled concrete aggregate (RCA). Four types of slab systems were examined, namely, CBC (cement concrete-based bamboo reinforced composite panels), CRBC (recycled concrete aggregate blended cement-based bamboo reinforced composite panels), GBC (geopolymer-based bamboo reinforced composite panels), and GRBC (recycled concrete aggregate blended geopolymer-based bamboo reinforced composite panels). The slab panels were evaluated through non-destructive testing (ultrasonic pulse velocity and rebound hammer test) and structural loading tests to measure first crack load, ultimate load, load-deflection behavior, stiffness, ductility index, deformability factor, and energy absorption capacity. In addition, cost-efficiency, energy demand, and eco-efficiency were analyzed. GBC specimen shows 19.6 % higher load carrying capacity than CBC specimen; meanwhile, GRBC specimen shows 22 % higher load carrying capacity than CRBC specimen. In comparison between the CBC and GBC specimens, the CBC possesses 49 % lower energy absorption capacity when compared to the GBC specimen. Meanwhile, the CRBC specimen possesses 38 % lower value compared to its counterpart (GRBC specimen). GRBC specimens are found to be quite effective in terms of cost, along with the load-carrying capacity.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"24 ","pages":"Article 100753"},"PeriodicalIF":8.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119539","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}