Developments in the Built Environment最新文献_第7页

Physicochemical properties of CO2-cured belite-rich cement with electric arc furnace reduction slag as a partial replacement 部分替代电弧炉还原渣的二氧化碳固化富褐铁矿水泥的物理化学特性

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100564

Geon Noh , Gaurav Sharma , Hyeju Kim , Kunal Krishna Das , Jeong Gook Jang , Jung-Jun Park , Namkon Lee

{"title":"Physicochemical properties of CO2-cured belite-rich cement with electric arc furnace reduction slag as a partial replacement","authors":"Geon Noh , Gaurav Sharma , Hyeju Kim , Kunal Krishna Das , Jeong Gook Jang , Jung-Jun Park , Namkon Lee","doi":"10.1016/j.dibe.2024.100564","DOIUrl":"10.1016/j.dibe.2024.100564","url":null,"abstract":"<div><div>This study investigates the physicochemical properties of CO<sub>2</sub>-cured belite-rich cement with electric arc furnace (EAF) reduction slag as a partial replacement at varying weight percentages (0–20%). The results revealed that water-cured specimens (WRS) showed significant increases in the numbers of gel and medium capillary pores, while carbonation-cured specimens (CRS) demonstrated increases in the numbers of large capillary and macro pores. Moreover, up to 10% replacement of the slag led to a decrease in the compressive strength, accompanied by increased CO<sub>2</sub> absorption and reduced alkalinity. When the EAF reduction slag content increased from 15% to 20%, CRS exhibited a trend reversal in the compressive strength, marked by an increase in the pH, approaching compressive strength comparable to those of WRS. This signified that higher percentages of EAF reduction slag are advantageous for enhancing CO<sub>2</sub> sequestration due to the potential reactivity of magnesium oxide in EAF reduction slag with CO<sub>2</sub>.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100564"},"PeriodicalIF":6.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental modal identification of a pedestrian bridge through drive-by monitoring integrated with shared-mobility vehicles 通过与共享交通车辆相结合的驾驶式监测，对一座人行天桥进行试验性模式识别

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100562

Kun Feng , David Hester , Su Taylor , Connor O'Higgins , Alan Ferguson , Zuo Zhu , Guang Zou , Myra Lydon , Juliana Early

{"title":"Experimental modal identification of a pedestrian bridge through drive-by monitoring integrated with shared-mobility vehicles","authors":"Kun Feng , David Hester , Su Taylor , Connor O'Higgins , Alan Ferguson , Zuo Zhu , Guang Zou , Myra Lydon , Juliana Early","doi":"10.1016/j.dibe.2024.100562","DOIUrl":"10.1016/j.dibe.2024.100562","url":null,"abstract":"<div><div>In the context of improving resilience in transport infrastructure, an emerging approach of indirect structural health monitoring is gaining attention, known as drive-by monitoring, instrumenting a vehicle with sensors to evaluate the bridges it crosses. However, their effectiveness has predominantly been investigated in ideal scenarios, with actual real-world applications being quite scarce. The research presented in this paper explores the feasibility of combining two routes: (1) fleet emissions reduction and (2) transport resilience enhancement, through drive-by monitoring integrated with shared mobility, including electric mobility scooter and bicycle. The information from drive-by data collected from shared mobility can give valuable information on critical transport infrastructure (e.g., bridges) and such a drive-by database has the potential for network level infrastructure condition assessment. In this paper, two different drive-by roadmaps are investigated subject to the flexibility of the bridges, namely partially or fully drive-by monitoring. To validate the proposed roadmaps, a full-scale pedestrian bridge was chosen for drive-by testing, where smartphone sensors and specialised accelerometers are mounted on shared mobility for data acquisition. Experimental results demonstrate that (i) smartphone sensing can provide data with similar accuracy compared to specialised accelerometers, (ii) bridge frequencies can be easily obtained from temporarily parked shared mobility, with a maximum relative error of 1.05%, (iii) both the bridge frequencies and operational deflection shapes are successfully extracted from the moving shared mobility by using variational mode decomposition and filtering techniques, and shared mobility's GPS data along with moving speeds are collected for potential vehicle positioning and drive-by database updating.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100562"},"PeriodicalIF":6.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing dynamic mechanical properties of cemented lithium mica tailings backfill with alkaline rice straw fibers: Experimental investigation and microscopic analysis 用碱性稻草纤维增强胶结锂云母尾矿回填的动态力学性能：实验研究与显微分析

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-24 DOI: 10.1016/j.dibe.2024.100563

Daopei Zhu , Nanhui Huang , Quanmao Xiao , Zhangli Wang

引用次数: 0

A unified object and keypoint detection framework for Personal Protective Equipment use 个人防护设备使用的统一对象和关键点检测框架

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-19 DOI: 10.1016/j.dibe.2024.100559

Bin Yang, Hongru Xiao, Binghan Zhang

{"title":"A unified object and keypoint detection framework for Personal Protective Equipment use","authors":"Bin Yang, Hongru Xiao, Binghan Zhang","doi":"10.1016/j.dibe.2024.100559","DOIUrl":"10.1016/j.dibe.2024.100559","url":null,"abstract":"<div><div>Accurately detecting whether workers wear Personal Protective Equipment (PPE) in real time plays an important role in safety management. Previous studies mainly used multiple models jointly or only object detection for wearing relationship judgments. This makes it difficult to provide real-time, accurate detection of security relationships. Therefore, this paper proposes safe-wearing detection rules and a novel multi-targets and keypoints detection framework (MTKF), which is capable of accomplishing multiple classes of targets and keypoints detection simultaneously in one-stage, to get more accurate results. In order to improve the performance in the PPE and worker keypoints detection in challenging construction scenes, the detection head transformation strategy, mix group shuffle attention (MGSA) module, and the improved dual and cross-class suppression algorithm (DC-NMS) are proposed. The experimental results are implemented on one established dataset (Joint dataset) and two public datasets (SHWD and COCO), which conduct a comprehensive evaluation in multiple dimensions. Compared to the baseline model, our method improves the mAP by 2.6%–7.1%, reduces the number of parameters by at least 70%, and is able to achieve an inference speed of 155 fps.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100559"},"PeriodicalIF":6.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catenary mechanism in steel columns under extreme lateral loading: A basis for building progressive collapse analysis 极端侧向荷载下钢柱的导柱机制：建筑物渐进式倒塌分析的基础

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-19 DOI: 10.1016/j.dibe.2024.100556

Foad Kiakojouri, Valerio De Biagi

引用次数: 0

Experimental investigation on reducing the interface adhesion of concrete and formwork via electroosmosis approach 通过电渗法减少混凝土和模板界面粘附力的实验研究

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100561

Jinhui Yang , Shaojun Fu , Yi Yang , Kekuo Yuan , Zhengyong Zhang , Qiang Gao

{"title":"Experimental investigation on reducing the interface adhesion of concrete and formwork via electroosmosis approach","authors":"Jinhui Yang , Shaojun Fu , Yi Yang , Kekuo Yuan , Zhengyong Zhang , Qiang Gao","doi":"10.1016/j.dibe.2024.100561","DOIUrl":"10.1016/j.dibe.2024.100561","url":null,"abstract":"<div><div>Slipform construction is widely used for building deep-buried vertical and inclined shaft concrete linings due to its efficiency and cost advantages. The adhesion of the interface during demoulding is crucial for the efficiency and quality of slip form construction. In this paper, a novel approach is proposed to reduce the adhesion between concrete and formwork based on electroosmotic technology. A self-designed concrete electroosmotic demoulding device was developed to simulate the electroosmotic slip-form construction of the shaft lining. The variations in parameters such as current and permeability during electroosmosis were analyzed, and the impact of electroosmotic parameters on the adhesion and demoulding quality of concrete was investigated. The results indicate that the electroosmotic method can significantly reduce the adhesion. Concrete demoulding defects are significantly reduced and smoother after electroosmotic treatment. This study provides a scientific basis and technical support for optimizing concrete construction demoulding technology.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100561"},"PeriodicalIF":6.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving construction site efficiency through automated progress monitoring of underground pipe installation sites using image color analysis of iPhone LiDAR camera data 利用 iPhone LiDAR 相机数据的图像颜色分析，对地下管道安装现场进行自动进度监测，从而提高施工现场效率

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100557

Tsukasa Mizutani, Shunsuke Iwai

{"title":"Improving construction site efficiency through automated progress monitoring of underground pipe installation sites using image color analysis of iPhone LiDAR camera data","authors":"Tsukasa Mizutani, Shunsuke Iwai","doi":"10.1016/j.dibe.2024.100557","DOIUrl":"10.1016/j.dibe.2024.100557","url":null,"abstract":"<div><div>This study presents an innovative method utilizing smartphone for automated progress monitoring at underground pipe installation sites. Leveraging the LiDAR iPhone camera, the method captures detailed point cloud data of construction sites. Sophisticated color analysis of images accurately distinguishes between areas with and without pipes within excavations. Key aspects of the proposed workflow include segmentation of the excavation area, differentiation between main and side excavations, and application of an earth color mask in the RGB space to isolate pipes. The research focuses on enhancing measurement precision for excavation width, depth, and pipe burial depth, significantly reducing the manual labor traditionally required at construction sites, thereby offering an efficient and cost-effective solution. We further demonstrated the robustness of the proposed algorithm by applying it to two types of data acquired at actual construction sites. This approach is expected to contribute significantly to the digital transformation in the construction industry.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100557"},"PeriodicalIF":6.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Grain-size composition effect on flexural response and pore structure of cementitious tail-rock fills with fiber reinforcement 粒度组成对纤维加固水泥基尾岩填料挠曲响应和孔隙结构的影响

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-18 DOI: 10.1016/j.dibe.2024.100558

Hao Qin , Shuai Cao , Erol Yilmaz

引用次数: 0

Vibration monitoring of masonry bridges to assess damage under changing temperature 对砌体桥梁进行振动监测，以评估温度变化下的损坏情况

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-17 DOI: 10.1016/j.dibe.2024.100555

Paolo Borlenghi, Antonella Saisi, Carmelo Gentile

{"title":"Vibration monitoring of masonry bridges to assess damage under changing temperature","authors":"Paolo Borlenghi, Antonella Saisi, Carmelo Gentile","doi":"10.1016/j.dibe.2024.100555","DOIUrl":"10.1016/j.dibe.2024.100555","url":null,"abstract":"<div><div>Structural Health Monitoring (SHM) is of utmost importance for the preservation and safe operation of historical arch bridges. This paper presents the development of a SHM strategy aimed at the model-based damage assessment of masonry bridges using frequency data. Structural damage induces natural frequency changes that are strictly related to the damage location. Consequently, a numerical model capable of reproducing the intact dynamic characteristics should allow to simulate damage scenarios, including the observed one, with the anomaly localisation being performed through the similarity between the experimentally detected frequency changes and the numerically simulated ones. The proposed methodology is based on the availability of an appropriate knowledge of the investigated structure, allowing to define a Finite Element (FE) model that accurately reproduces the system dynamic characteristics. Hence, the SHM strategy involves: (a) the use of the calibrated model to simulate different damage scenarios, so that a Damage Location Reference Matrix (DLRM) is defined through the associated frequency shifts; (b) the damage detection through statistical pattern recognition of vibration data; (c) the damage localisation through the comparison between the identified frequency changes and those defined in the DLRM matrix. Pseudo-experimental monitoring data, referring to a historical masonry viaduct, were generated and used to exemplify the reliability and accuracy of the developed algorithms in detecting and localizing damage.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100555"},"PeriodicalIF":6.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upcycling of waste rubber using pelletized artificial geopolymer aggregate technology 利用粒状人工土工聚合物骨料技术实现废橡胶的升级再循环

IF 6.2 2区工程技术

Developments in the Built Environment Pub Date : 2024-10-10 DOI: 10.1016/j.dibe.2024.100554

Hui Wang , Lan-Ping Qian , Ling-Yu Xu , Yi Li , Hong Guan

{"title":"Upcycling of waste rubber using pelletized artificial geopolymer aggregate technology","authors":"Hui Wang , Lan-Ping Qian , Ling-Yu Xu , Yi Li , Hong Guan","doi":"10.1016/j.dibe.2024.100554","DOIUrl":"10.1016/j.dibe.2024.100554","url":null,"abstract":"<div><div>The utilization of waste rubber as aggregates shows both environmentally friendly features and high cost-efficiency in construction, but may cause poor workability such as rubber flotation and agglomeration. To address the above issues, the pelletization method was adopted to produce rubberized artificial geopolymer aggregates (R-GPA), and the effects of different rubber modification methods and rubber contents were investigated through pelletization technologies, mechanical tests, X-ray computed tomography (XCT) and backscattered electron with energy-dispersive spectroscopy (BSE-EDS). Results showed that the combined modification with NaOH solution and silane coupling agent presented the most effective surface modification efficiency. According to microscopic analysis, rubber modification could effectively enhance the rubber-matrix interface. The produced R-GPA could thus possess an oven-dried particle density within 1500–1800 kg/m³, a water absorption of 7%–10.5%, and a pelletization efficiency over 98%, which provided a new insight into the value-added utilization of waste rubber and the promotion of artificial aggregate technologies.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"20 ","pages":"Article 100554"},"PeriodicalIF":6.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0