Developments in the Built Environment最新文献

英文中文

Quantitative study on carbon emissions of modified recycled asphalt mixture based on life cycle assessment method

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-12-01 DOI: 10.1016/j.dibe.2024.100584

Xiaohua Liu , Lu Deng , Henglong Zhang , Jiangmiao Yu

The recycled asphalt technology is considered to have environmental sustainability prospects due to the resource conservation of old material recycling. Nonetheless, how to quantitatively evaluate the environmental impact of the entire life cycle of recycled asphalt pavement (RAP) still needs to be sorted out. Based on the theory of life cycle management, through the Life-cycle assessment (LCA) method, this study establishes a quantitative assessment model for the environmental impact of recycled asphalt pavement. A quantitative assessment model is established for the full life cycle environmental impact of recycled asphalt pavement. The model can output a list of environmental impacts for each stage of the life cycle, and can also conduct characteristic impact assessments based on five major impact categories: energy consumption (EC), global warming potential (GWP), acidification potential (AP), human health hazards (HTP), and particulate matter emissions. The results indicate that the acquisition of raw materials is the dominant stage for the environmental impact of cold recycled asphalt pavement, with a proportion of over 50% for each major impact category. In the construction of highways, using recycled modified asphalt mixture can reduce the total emissions by 12,976 kg per kilometer. In addition, the life cycle inventory (LCI) analysis shows that the environmental impact of recycled asphalt pavement is mainly quantified by energy consumption and various pollutant emissions, such as CO2, CH4, SO2, CO, N2O, NMVOC, particulate matter, and asphalt smoke. The raw material extraction stage has been identified as the stage with the greatest environmental impact, making significant contributions in energy consumption, global warming potential, acidification potential, human health hazards, and particulate matter emissions. This indicates that utilizing cold recycling technology and increasing the use of recycled RAP materials are efficient ways to promote energy conservation, reduce emissions, and minimize the environmental impact of asphalt pavement throughout its lifecycle.

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引用次数: 0

Enhancing the Printing Quality and Mechanical Properties of 3D-Printed Cement Composites with Date Syrup-Based Graphene Coated Sand Hybrid 用枣泥基石墨烯涂砂混合材料提高三维打印水泥复合材料的打印质量和力学性能

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-24 DOI: 10.1016/j.dibe.2024.100582

Mohd Mukarram Ali , Rashid.K.Abu Al-Rub , Fawzi Banat , Tae-Yeon Kim

This study addresses the influence of adding date syrup-based graphene-coated sand hybrid (D-GSH) as a partial substitute for sand in 3D-printed cement composites, exploring its potential to enhance both fresh and hardened properties. Incorporating 0.5% D-GSH significantly improved the printing quality compared to the control mix, as evidenced by the reduction in the variance in thickness of double layers from 38% to 28%. In addition, buildability was enhanced by 116% with an open time of 27 min. The rheological properties showed reduced viscosity and shear stress against shear rates, thereby enhancing flowability. Moreover, the addition of 0.5% D-GSH increased the compressive strength, flexural strength, and elastic modulus by 62%, 118%, and 40%, respectively, after 28 days of curing, compared with a mix containing silica fume. Microstructural analysis revealed that D-GSH effectively fills gaps, bridges cracks, and bonds with the hydration products of cement matrix, thus improving the mechanical properties.

本研究探讨了在 3D 打印水泥复合材料中添加红枣糖浆基石墨烯包覆砂混合材料（D-GSH）作为砂的部分替代品的影响，探索其提高新鲜和硬化性能的潜力。与对照混合物相比，加入 0.5% 的 D-GSH 能显著提高打印质量，双层厚度差异从 38% 降至 28%。此外，在 27 分钟的开放时间内，可施工性提高了 116%。流变特性显示，粘度和剪切应力随剪切速率的变化而降低，从而提高了流动性。此外，与含有硅灰的混合料相比，添加 0.5% 的 D-GSH 可在 28 天固化后将抗压强度、抗折强度和弹性模量分别提高 62%、118% 和 40%。微观结构分析表明，D-GSH 能有效填充空隙、弥合裂缝并与水泥基质的水化产物结合，从而改善力学性能。

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引用次数: 0

Enhancing the flexural capacity of RC beams under various loading rates through strengthening with ultra-high-performance fiber-reinforced concrete 通过使用超高性能纤维加固混凝土增强不同荷载率下 RC 梁的抗弯能力

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-24 DOI: 10.1016/j.dibe.2024.100581

Doo-Yeol Yoo , Booki Chun , Jinsoo Choi , Kyung-Hwan Min , Hyun-Oh Shin

This study investigates the enhancement of impact resistance in reinforced concrete (RC) beams using ultra-high-performance fiber-reinforced concrete (UHPFRC). Three types of steel fibers and two fiber volume fractions (0.75% and 1.5%) were considered. UHPFRC-strengthened RC beams exhibited an increase in flexural strength by approximately 6% at a fiber volume fraction of 1.5% compared to plain RC beams, due to effective crack suppression. Steel fibers in the UHPFRC strengthening layer inhibited the deep propagation of cracks into the compressive zone, resulting in a more gradual decrease in the neutral axis depth of RC beams. Under impact loading, UHPFRC-strengthened beams showed up to 7% lower deflection, with straight steel fibers providing superior impact resistance. RC beams strengthened with UHPFRC including straight steel fibers demonstrated improved residual flexural strength at higher fiber volumes. This highlights UHPFRC's effectiveness in enhancing impact resistance of RC beams according to the fiber type and volume fraction.

本研究探讨了使用超高性能纤维增强混凝土（UHPFRC）提高钢筋混凝土（RC）梁抗冲击性能的问题。研究考虑了三种钢纤维和两种纤维体积分数（0.75% 和 1.5%）。与普通 RC 梁相比，纤维体积分数为 1.5% 的 UHPFRC 加固 RC 梁的抗弯强度提高了约 6%，这是由于裂缝得到了有效抑制。UHPFRC 加固层中的钢纤维抑制了裂纹向受压区的纵深扩展，从而使 RC 梁的中性轴深度逐渐减小。在冲击荷载作用下，UHPFRC 加固梁的挠度最多可降低 7%，直钢纤维提供了更优越的抗冲击性能。使用 UHPFRC（包括直钢纤维）加固的 RC 梁在纤维量较高的情况下显示出更高的残余抗弯强度。这凸显了 UHPFRC 在根据纤维类型和体积分数提高 RC 梁抗冲击性能方面的有效性。

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引用次数: 0

Development of latex / silica aerogel composites for thermal insulation applications 开发用于隔热应用的乳胶/二氧化硅气凝胶复合材料

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-20 DOI: 10.1016/j.dibe.2024.100576

Samuel Pantaleo, Florent Gauvin, Katrin Schollbach, H.J.H. Brouwers

Silica aerogel stands out as an exceptional thermal insulation material and is a great candidate for modern and energy-efficient buildings. However, silica aerogel also faces many challenges, mainly due to its expensive, unsustainable and difficult synthesis process, but also its poor structural properties. Consequently, the main research focus for silica aerogel is to mitigate its brittleness in order to pave the way for broader applications, especially in the building field. Therefore, this study focuses on the development of composite materials aiming at solving the abovementioned drawbacks of silica aerogel, by using environmentally friendly latexes and reinforcement that are easy to process. Results show the positive effect of this reinforcement, even at a small amount (5% volume), on the composite's properties, with thermal conductivity at least equivalent, or better, to either in development or already established insulation materials in the market.

二氧化硅气凝胶是一种特殊的隔热材料，是现代节能建筑的理想材料。然而，二氧化硅气凝胶也面临着许多挑战，主要是由于其合成工艺昂贵、不可持续且困难重重，而且结构性能较差。因此，二氧化硅气凝胶的主要研究重点是减轻其脆性，以便为更广泛的应用铺平道路，特别是在建筑领域。因此，本研究侧重于开发复合材料，旨在通过使用环保型胶乳和易于加工的增强材料，解决二氧化硅气凝胶的上述缺点。研究结果表明，即使只使用少量（5% 体积）增强剂，也会对复合材料的性能产生积极影响，其导热性至少相当于或优于市场上正在开发或已经成熟的隔热材料。

引用次数: 0

Assessing cyber risks in construction projects: A machine learning-centric approach 评估建筑项目中的网络风险：以机器学习为中心的方法

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-19 DOI: 10.1016/j.dibe.2024.100570

Dongchi Yao , Borja García de Soto

The construction industry is undergoing digitalization, but it is increasingly vulnerable to cyber attacks due to its slow pace in developing effective cyber risk assessment tools. This study develops a Machine Learning (ML)-centric approach to assess common cyber risks for construction projects. This approach comprises three components: (1) For risk prediction, a simulated dataset is generated using Monte Carlo simulations, which is utilized for model training. A two-phase model development strategy is proposed to select the optimal model for each risk. (2) For risk factor analysis, ML feature analysis methods are adapted to identify risk factors that contribute significantly to risks of specific projects. (3) For the risk reduction strategy, a greedy optimization algorithm is proposed to efficiently address high-contributing risk factors. To demonstrate the applicability of the developed approach, a case study is conducted on a real construction project.

建筑行业正在经历数字化，但由于其在开发有效网络风险评估工具方面进展缓慢，越来越容易受到网络攻击。本研究开发了一种以机器学习（ML）为中心的方法，用于评估建筑项目的常见网络风险。该方法由三部分组成：(1) 在风险预测方面，使用蒙特卡罗模拟生成模拟数据集，用于模型训练。建议采用两阶段模型开发策略，为每种风险选择最佳模型。(2) 在风险因素分析方面，采用 ML 特征分析方法来识别对特定项目风险有重大影响的风险因素。(3) 在风险降低策略方面，提出了一种贪婪优化算法，以有效解决高贡献风险因素。为了证明所开发方法的适用性，我们在一个实际建筑项目中进行了案例研究。

引用次数: 0

Geometrical and structural design development of an active-bending structure from natural fibre pultruded profiles: The LightPRO shell 利用天然纤维拉挤型材进行主动弯曲结构的几何和结构设计开发：LightPRO 外壳

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-19 DOI: 10.1016/j.dibe.2024.100577

Evgenia Spyridonos , Yanan Guo , Marta Gil Pérez , Hanaa Dahy

The utilisation of bio-based materials has significantly increased in recent years, driven by a growing awareness of environmentally friendly alternatives in the construction industry. This study introduces innovative natural fibre pultruded profiles for load-bearing applications in structural systems. By employing pultrusion technology with flax fibres and customised plant-based matrix, linear and unidirectional biocomposite profiles were developed. These profiles were used in the creation of LightPRO Shell, an active-bending structure combining biocomposite profiles with a membrane outer skin, demonstrating their mechanical properties and suitability for such applications. The paper focuses on the geometrical and structural design development of the structure employing computational design tools for optimisation, ensuring design parameters and performance requirements were met. The final structure, a 10-m span doubly curved gridshell, features a continuous perimeter beam and consists of 44 profiles ranging from 6 to 12.5 m, showcasing the potential of natural fibre biocomposites as sustainable alternatives in construction.

近年来，由于建筑行业对环保型替代品的认识不断提高，生物基材料的使用量大幅增加。本研究介绍了用于结构系统承重应用的创新型天然纤维拉挤型材。通过采用亚麻纤维拉挤技术和定制的植物基基体，开发出了线性和单向生物复合材料型材。这些型材被用于制作 LightPRO Shell，这是一种将生物复合材料型材与薄膜外皮结合在一起的主动弯曲结构，证明了它们的机械性能以及在此类应用中的适用性。论文重点介绍了该结构的几何和结构设计开发，采用计算设计工具进行优化，确保满足设计参数和性能要求。最终的结构是一个跨度为 10 米的双曲面网格壳，具有连续的周边梁，由 44 个 6 米到 12.5 米不等的型材组成，展示了天然纤维生物复合材料作为可持续建筑替代品的潜力。

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引用次数: 0

Design and validation of a selective binding 3D printer for bio-based construction materials 设计并验证用于生物基建筑材料的选择性结合 3D 打印机

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-17 DOI: 10.1016/j.dibe.2024.100579

Valentine Danché, Mamma Bouaouich, Abdeslam Benamara, Alexandre Pierre, Khadim Ndiaye, T.T. Ngo

We aim to address that home-made design and assembly can be effective to investigate several sizes and natures of construction materials. This study offers a new design that accepts different powder and bio-based materials to enhance the functionality of construction elements. We developed a system in which a numerical controlled machine is coupled with a 6 axis articulated-arm to selectively bind a mineral powder bed with liquid’s droplets. A home-made frame has been designed and built to adapt the geometrical space that allows the displacement of the numerical controlled machine and the articulated arm. The powder deposition is carried out using a tank controlled by an Arduino board. In parallel, we propose a fluid deposition system using a pressurized tank and a valve jetting that allows the deposition of millimetric liquid droplet. 3D printing tests using cement particles, water retention agent, and a composite of cement with hemp aggregates were carried out to validate the prototype. We then highlight, as a proof of concept, that an innovative selective binding 3D printer could bring new composites or biobased materials in construction industry.

我们的目标是解决自制设计和组装可以有效研究多种尺寸和性质的建筑材料的问题。这项研究提供了一种新的设计，可接受不同的粉末和生物基材料，以增强建筑构件的功能。我们开发了一种系统，将数控机床与 6 轴铰接臂相结合，选择性地将矿物粉末床与液滴结合在一起。我们设计并建造了一个自制框架，以调整几何空间，使数控机床和关节臂能够位移。粉末沉积是通过一个由 Arduino 板控制的水箱进行的。与此同时，我们还提出了一种流体沉积系统，使用一个加压罐和一个阀门喷射器，可以沉积毫米级的液滴。为了验证原型，我们使用水泥颗粒、保水剂以及水泥与麻骨料的复合材料进行了 3D 打印测试。然后，作为概念验证，我们强调创新的选择性结合 3D 打印机可为建筑行业带来新型复合材料或生物基材料。

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引用次数: 0

Exploring the compositional effect of eco-friendly ultra-high performance concrete on dynamic strength based on stacking algorithm and explainable artificial intelligence 基于堆叠算法和可解释人工智能探索环保型超高性能混凝土的组成对动态强度的影响

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-17 DOI: 10.1016/j.dibe.2024.100574

L.L. Wu , D.L. Zou , Y.F. Hao

This study proposes a two-layer fusion model (stacking-CARF) to predict the dynamic compressive strength of eco-friendly ultra-high performance concrete (UHPC). Before building the prediction model, a well-balanced UHPC dynamic compression dataset is created using the anomaly detection algorithm. Subsequently, it is experimentally determined that the stacking-CARF model consisting of categorical boosting, random forest and linear regression outperforms other prominent ensemble learning and stacked models, and can be used as a robust strength prediction tool. Moreover, Explainable Artificial Intelligence is utilized to elucidate the intricate relationship between material proportions and dynamic compressive strength from both global and local perspectives, offering insights challenging to quantify using traditional methods. In particular, the interaction analysis affirms the role of reasonable replacement ratios between cement and supplementary cementitious materials in enhancing sustainability and cleaner production practices. Finally, a Python-based graphical user interface is developed to facilitate the implementation of the stacking-CARF model in engineering applications.

本研究提出了一种双层融合模型（堆叠-CARF）来预测环保型超高性能混凝土（UHPC）的动态抗压强度。在建立预测模型之前，使用异常检测算法创建了一个均衡的超高性能混凝土动态抗压数据集。随后，通过实验确定，由分类提升、随机森林和线性回归组成的堆叠-CARF 模型优于其他著名的集合学习和堆叠模型，可用作稳健的强度预测工具。此外，还利用可解释人工智能从全局和局部角度阐明了材料比例与动态抗压强度之间错综复杂的关系，提供了传统方法难以量化的见解。特别是，交互分析肯定了水泥和胶凝补充材料之间合理的替代比例在提高可持续性和清洁生产实践中的作用。最后，还开发了一个基于 Python 的图形用户界面，以方便在工程应用中实施堆叠-CARF 模型。

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引用次数: 0

Improving properties of Portland cement-blast furnace slag blended paste through sodium bicarbonate-induced carbonation 通过碳酸氢钠诱导碳化改善波特兰水泥-高炉矿渣混合浆料的性能

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-17 DOI: 10.1016/j.dibe.2024.100575

Melaku N. Seifu , Daeik Jang , G.M. Kim , Solmoi Park

The addition of NaHCO₃ has the potential to enhance properties of concrete by facilitating internal carbonation. This study investigates the effects of the incorporation of NaHCO₃ into ordinary Portland cement-blast furnace slag paste. The results show that the addition of NaHCO₃ had an impact on the hydration process and increased the heat of hydration on all the slag samples. NaHCO₃ caused internal carbonation and facilitated the formation of calcium carbonate and different carbon-based AFm phases, such as monocarbonate. The incorporation of NaHCO₃ improved the pore structure of the paste and enhanced resistance against chloride penetration. The chloride migration coefficient of the Portland cement paste sample was reduced up to 96.5% with the incorporation of 2% NaHCO₃ at 70% slag replacement. The compressive strength of the samples also showed an improvement with 1% NaHCO₃ addition increasing the early age strength and 2% NaHCO₃ addition increasing the matured age strength.

添加 NaHCO3 有可能通过促进内部碳化来提高混凝土的性能。本研究调查了在普通硅酸盐水泥-高炉矿渣浆料中掺入 NaHCO3 的影响。结果表明，添加 NaHCO3 对水化过程有影响，并提高了所有矿渣样品的水化热。NaHCO3 会引起内部碳化，促进碳酸钙和不同碳基 AFm 相（如单碳酸盐）的形成。NaHCO3 的加入改善了浆料的孔隙结构，提高了抗氯化物渗透的能力。在矿渣替代率为 70% 的情况下掺入 2% 的 NaHCO3 后，硅酸盐水泥浆样品的氯离子迁移系数降低了 96.5%。样品的抗压强度也有所改善，添加 1% 的 NaHCO3 可提高早期龄期强度，添加 2% 的 NaHCO3 可提高成熟龄期强度。

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引用次数: 0

Twinning the path of digital building permits and digital building logbooks – Diagnosis and challenges 数字建筑许可和数字建筑日志的孪生之路--诊断与挑战

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment

Pub Date : 2024-11-17 DOI: 10.1016/j.dibe.2024.100573

Pedro Mêda , Judith Fauth , Christian Schranz , Hipólito Sousa , Harald Urban

In the context of the European Union's push for a sustainable and digitally integrated construction sector, this research explores the relationship between Digital Building Permits (DBP) and Digital Building Logbooks (DBL). The study aims to diagnose and identify the synergies and challenges in aligning these data-driven concepts throughout the building life-cycle. Using a focus group methodology, the research gathered qualitative data on the perceptions of DBP and DBL among professionals with diverse backgrounds. The findings reveal significant overlaps and potential for integrated data management, enhancing regulatory compliance, efficiency, and sustainability. While DBP and DBL can function independently, their full potential is realised through a cohesive framework that supports continuous data updates and stakeholder collaboration, facilitating the “golden thread” of information essential for effective digital twin applications. Future research should further explore the detailed processes and data exchanges necessary to implement this framework successfully.

在欧盟推动可持续发展和数字一体化建筑行业的背景下，本研究探讨了数字建筑许可（DBP）和数字建筑日志（DBL）之间的关系。该研究旨在诊断和识别在整个建筑生命周期中调整这些数据驱动概念的协同作用和挑战。研究采用焦点小组的方法，收集了具有不同背景的专业人员对 DBP 和 DBL 的看法的定性数据。研究结果揭示了集成数据管理的重大重叠和潜力，提高了合规性、效率和可持续性。虽然 DBP 和 DBL 可以独立运作，但它们的全部潜能都可以通过支持持续数据更新和利益相关者协作的内聚框架来实现，从而促进有效数字孪生应用所必需的信息 "金线"。未来的研究应进一步探索成功实施这一框架所需的详细流程和数据交换。

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引用次数: 0

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