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Award-winning paper in 2021 2021年获奖论文
4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-02-01 DOI: 10.1680/jensu.2023.176.1.53
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引用次数: 0
Engineering Sustainability: Referees 2022 工程可持续性:裁判员2022
4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-02-01 DOI: 10.1680/jensu.2023.176.1.54
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引用次数: 0
Editorial: Engineering sustainability through innovative use of materials and assessment 社论:通过材料和评估的创新使用实现工程可持续性
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-02-01 DOI: 10.1680/jensu.2023.176.1.1
W. Pan
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引用次数: 0
Resource efficiency factors in industrialised construction – a study in developing economies 工业化建筑中的资源效率因素——对发展中经济体的研究
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-26 DOI: 10.1680/jensu.22.00048
F. Kedir, D. Hall, D. Ioannidou, Thomas Rupper, Richard Boyd, A. Hollberg
Developing economies need to supply housing and ensure resource efficiency in the process. Industrialised construction, which increases productivity in construction, can be one means to deliver the needed housing. However, the resource efficiency of industrialised construction in developing economies is under-researched. This paper studies factors influencing resource efficiency in industrialised housing products from a perspective of value chain and environmental impact in Addis Ababa, Ethiopia; Nairobi, Kenya; and Cape Town, South Africa. Specifically, wall systems with varying degrees of industrialised construction implementation are studied. The study uncovers four main insights—first, the choice of materials influences the resource-efficiency of industrialised wall systems. However, the current value chain does not promote the adoption of new materials. Second, products used for industrialised wall systems are imported and incur added transportation-related impacts and beyond. Third, industrialised construction wall systems often use lightweight materials and have the potential for disassembly. However, end-users have reservations about such design strategies. Fourth, controlled production of wall systems reduces construction waste and increases the quality of products. Nevertheless, governments are currently promoting labour-intensive construction methods. Based on these insights, the paper concludes with recommendations, levers, and action points for stakeholders to promote resource efficiency in industrialised construction adoption.
发展中经济体需要提供住房,并在此过程中确保资源效率。工业化建筑提高了建筑的生产率,可以成为提供所需住房的一种手段。然而,对发展中经济体工业化建筑的资源效率研究不足。本文从价值链和环境影响的角度研究了埃塞俄比亚亚的斯亚贝巴工业化住房产品资源效率的影响因素;肯尼亚内罗毕;以及南非的开普敦。具体来说,研究了不同程度工业化建筑实施的墙体系统。该研究揭示了四个主要的见解:首先,材料的选择影响工业化墙壁系统的资源效率。然而,目前的价值链并没有促进新材料的采用。其次,用于工业化墙面系统的产品是进口的,会产生额外的运输相关影响。第三,工业化建筑墙体系统通常使用轻质材料,具有拆卸的潜力。然而,最终用户对这种设计策略持保留态度。第四,墙体系统的受控生产减少了建筑垃圾,提高了产品质量。然而,各国政府目前正在推广劳动密集型的建筑方法。基于这些见解,本文总结了利益相关者在工业化建筑采用中提高资源效率的建议、杠杆和行动点。
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引用次数: 0
Alkali activators with different cations transforming low-value volcanic ash into eco-friendly geopolymers 不同阳离子的碱活化剂将低价值火山灰转化为环保地聚合物
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-19 DOI: 10.1680/jensu.22.00078
Rongrong Zhang, Feng Li, Siqi Zhou, Yijie Su, Duanyang Liu, Q. Niu
Geopolymers are green and sustainable cementitious materials as a possible alternative to cement due to lower energy consumption and emissions. Volcanic ash is considered a low-value material because of its worldwide distribution and huge reserves but limited applications. Beneficial to its high silica and alumina content, volcanic ash can be used as raw material to prepare geopolymers by alkali activation. However, research on volcanic ash-based geopolymers is still limited, no consensus on the optimal alkali activator is obtained, and the reaction mechanism is not yet clear. This paper aims to investigate the effect of alkali activators with different cations on the mechanical properties and microstructure of volcanic ash-based geopolymers. The flexural and compressive strength were evaluated. X-ray diffractometry, Fourier Transform Infrared Spectrometry, Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy, and 29Si Magic Angle Spinning-Nuclear Magnetic Resonance were used to characterize the microstructural properties. The results showed that the alkali activation effect of NaOH on volcanic ash was superior to that of LiOH and KOH, especially at a concentration of 8 mol/L, with 28-d flexural and compressive flexural strengths of 3.0 MPa and 28.3 MPa, respectively. Microstructural results indicated that LiOH and KOH could induce volcanic ash to undergo geopolymerization to generate loose particles as products. In contrast, the NaOH-activated geopolymers formed dense, continuous, highly polymerized silica-aluminate gels. This paper provides a proper ratio scheme for activating the volcanic ash mined from the deposit in the present study and promoting practical applications conducive to sustainable engineering development in the future.
地聚合物是一种绿色和可持续的胶凝材料,由于其低能耗和低排放,可能成为水泥的替代品。火山灰被认为是一种低价值的材料,因为它分布在世界各地,储量巨大,但应用有限。火山灰具有较高的二氧化硅和氧化铝含量,可作为碱活化法制备地聚合物的原料。然而,对火山灰基地聚合物的研究仍然有限,对最佳的碱活化剂没有达成共识,反应机理也不清楚。研究了不同阳离子碱性活化剂对火山灰基地聚合物力学性能和微观结构的影响。对其抗折和抗压强度进行了评价。采用x射线衍射、傅里叶变换红外光谱、扫描电镜-能量色散光谱和29Si魔角自旋-核磁共振对其微观结构进行了表征。结果表明:NaOH对火山灰的碱活化效果优于LiOH和KOH,特别是在浓度为8 mol/L时,其28 d抗弯强度和抗压强度分别为3.0 MPa和28.3 MPa;微观结构结果表明,LiOH和KOH可以诱导火山灰发生地聚合,生成松散颗粒作为产物。相反,naoh活化的地聚合物形成致密、连续、高聚合的硅铝酸盐凝胶。本文为本研究中开采的火山灰活化提供了合适的配比方案,促进了实际应用,有利于未来工程的可持续发展。
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引用次数: 0
Development of sustainable concrete using rice husk ash and refractory brick waste: a systematic approach 利用稻壳灰和耐火砖废料开发可持续混凝土:系统方法
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-12 DOI: 10.1680/jensu.22.00003
S. Behera, R. Patra, Bibhuti Bhusan Mukharjee
This current experimental research work is undertaken to assess the possibility of implementing sustainability by developing concrete mixes by utilising rice husk ash (RHA) and refractory brick waste (RBW) as a supplement to cement and coarse aggregates respectively. To fulfil the objective mentioned earlier, a systematic study comprising of evaluation of impact of RHA and RBW on concrete behaviour has been performed by carrying out different tests of strength and durability. These tests are conducted on specimens of specified mixes designed by varying the RBW as 0, 25%, and 50% and RHA levels as 0%, 10%, 15% and 20% and effects RBW and RHA are computed by comparing their behaviour with corresponding control mixes. The critical analysis of the outcome of experimental results depicts that enhancement of RBW(%) has no substantial impact on various properties of mixes. However, the incorporation of RHA (%) affects concrete behaviour by degrading concrete quality. These outcomes suggest the usage of RBW up to 10% in place of the coarse natural aggregates of concrete and 10% RHA as substitution of cement to make an eco-friendly product for field applications.
目前进行的实验研究工作是评估通过分别利用稻壳灰(RHA)和耐火砖废料(RBW)作为水泥和粗骨料的补充来开发混凝土混合物,从而实现可持续性的可能性。为了实现前面提到的目标,通过进行不同的强度和耐久性测试,进行了一项系统研究,包括评估RHA和RBW对混凝土性能的影响。这些试验是在特定混合物的试样上进行的,通过将RBW改变为0、25%和50%,RHA水平为0%、10%、15%和20%,并通过将RBW和RHA的行为与相应的对照混合物进行比较来计算其影响。实验结果的临界分析表明,RBW(%)的增加对混合料的各项性能没有实质性的影响。然而,RHA(%)的掺入会降低混凝土质量,从而影响混凝土的性能。这些结果表明,使用高达10%的RBW来代替混凝土的粗天然骨料,10%的RHA作为水泥的替代品,以制造一种可用于现场应用的环保产品。
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引用次数: 0
Investigation of the construction and demolition materials reinforced by geosynthetics 土工合成材料加固建筑与拆除材料的研究
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-04 DOI: 10.1680/jensu.22.00077
Bahadir Ok, Talha Sarıcı, A. Demir, Tugrul Talaslioglu, Abdulazim Yildiz
Many researchers suggest using construction and demolition materials in engineering applications (C&D) rather than virgin aggregates (VA). However, the engineering properties of the C&D tend to be poorer than those of the VA. This study presents the results of plate loading tests performed on unpaved roads with the C&D, reinforced by different types of geosynthetics on the soft subgrade. As part of these tests, the effects of some geosynthetics’ parameters such as (1) the embedment depth, (2) height and pocket opening of geocell, (3) the embedment depths and number of geogrids, (4) the distance between geogrids, and (5) the stiffness of geotextile on the bearing capacity of the unpaved road were investigated. Besides, the same plate loading test was also conducted on an unpaved road built by the VA. As a result of this study, although the performance of the C&D was determined to be less than that of the VA, it was concluded that the C&D performed well enough to be used as an alternative to the VA on unpaved roads. Besides, with a very small number of geosynthetics, it was determined that the C&D could have a better performance than that of the VA.
许多研究人员建议在工程应用中使用建筑和拆除材料(C&D)而不是原始集料(VA)。然而,C&D的工程性能往往比VA差。本研究介绍了在软基上用不同类型的土工合成材料加固C&D的未铺设道路上进行的板载试验结果。作为试验的一部分,研究了土工合成材料的参数(1)埋深、(2)土工格室的高度和孔开度、(3)土工格栅的埋深和个数、(4)土工格栅之间的距离、(5)土工织物的刚度等)对非铺装道路承载力的影响。此外,同样的板载试验也在VA建造的非铺装道路上进行。研究结果表明,虽然C&D的性能不如VA,但C&D的性能足够好,可以替代VA在非铺装道路上使用。此外,在少量土工合成材料的情况下,C&D比VA具有更好的性能。
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引用次数: 4
A case study on various developments of soil reinforced embankment slope stability with natural fibre additives 天然纤维加筋路堤边坡稳定性研究进展
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-03 DOI: 10.1680/jensu.22.00080
Saurabh Kumar, L. B. Roy
In this work, an attempt is made to study the influence of jute fibre reinforcement with the help of three case studies discussed here. The first case study described laboratory model testing and numerical analysis performed on a modelled slope that simulated an existent embankment that failed on many occasions following overnight heavy rainfall. The second case study discussed how vegetation may minimise the likelihood of soil separation and the velocity of surface run-off by decreasing surficial soil erosion. Jute geotextile (JGT) has an excellent hydrophilic characteristic that aids plant development, for this reason, it was used. The third case study developed a multi-fibre approach to traditional geotextiles to create an eco-sustainable product(s) with superior geotechnical qualities for improving the efficiency of earthen structures using soft revetments. The conclusion of these case studies expressed the novel objective for the improvement of embankments with stability analysis. This research also arose with the soil sample testing and the numerical modelling using Geo-studio. The slope model will consider being reinforced with the different rows of jute tassels on the embankment for enhanced stability and a factor of safety. Hence, the presence of jute fibre geotextile results in better performance in the stabilization of soil and also with the minimum value of deformation and maximum value of the factor of safety.
本文试图通过三个案例来研究黄麻纤维增强的影响。第一个案例研究描述了实验室模型测试和对模拟边坡的数值分析,该边坡模拟了在夜间强降雨后多次发生破坏的现有路堤。第二个案例研究讨论了植被如何通过减少表层土壤侵蚀来减少土壤分离的可能性和地表径流的速度。黄麻土工布(JGT)具有良好的亲水性,有利于植物发育,因此被广泛应用。第三个案例研究开发了传统土工布的多纤维方法,以创造具有优越岩土质量的生态可持续产品,以提高使用软护坡的土结构的效率。这些案例研究的结论表达了用稳定性分析改善路堤的新目标。本研究还与土样测试和使用Geo-studio进行数值模拟有关。该边坡模型将考虑在路堤上加设不同排的黄麻流苏,以提高稳定性和安全系数。因此,黄麻纤维土工布的存在对土体的稳定性能更好,并且具有最小的变形值和最大的安全系数。
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引用次数: 0
Sustainability in geotechnical engineering – what does it mean and why does that matter? 岩土工程中的可持续性——它意味着什么?为什么重要?
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2023-01-03 DOI: 10.1680/jensu.22.00076
L. von der Tann, D. Basu, Stefan Ritter, Paul Sverdrup Capellen, I. Størdal
The aspiration to act in a more sustainable manner has become a guiding principle across many aspects of life. Yet, sustainability is still often perceived as poorly defined, and there are diverse opinions on what the implications of sustainability for the everyday practice of geotechnical engineers are. On this background, this paper presents a survey conducted at the Norwegian Geotechnical Institute (NGI) in the beginning of 2021 that engaged a group of geotechnical engineers with the fundamental question as to how the concept of sustainability relates to geotechnical engineering. The Q-methodology, a mixed method approach, was applied to analyse different perspectives on sustainability in geotechnical engineering as inferred from the survey results. Three distinct perspectives were revealed that have a focus on (a) striving a balance between human action and nature, (b) mitigating adverse impacts of geotechnical projects, and (c) reducing resource use. Two of the perspectives considered the development of sustainability assessment tools as the most relevant means of working towards sustainable geotechnical practices whilst the third perspective considered multidisciplinary collaboration and research as more important. Reflection on these perspectives can help the development of future tools and strategies, provide a direction for future research, and contribute to a more sustainable geotechnical engineering practice.
以更可持续的方式行事的愿望已成为生活许多方面的指导原则。然而,可持续性仍然经常被认为是一个定义不明确的概念,关于可持续性对岩土工程师日常实践的影响有不同的观点。在此背景下,本文介绍了2021年初在挪威岩土研究所(NGI)进行的一项调查,该调查让一组岩土工程师参与了关于可持续性概念如何与岩土工程相关的基本问题。q -方法论是一种混合方法,应用于分析从调查结果推断的岩土工程可持续性的不同观点。揭示了三个不同的观点,重点是(a)努力在人类活动与自然之间取得平衡,(b)减轻岩土工程的不利影响,以及(c)减少资源使用。其中两个观点认为发展可持续性评估工具是实现可持续岩土工程实践的最相关手段,而第三个观点认为多学科合作和研究更为重要。对这些观点的反思有助于未来工具和策略的发展,为未来的研究提供方向,并有助于更可持续的岩土工程实践。
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引用次数: 0
Environmental evaluation of applications of concrete with recycled material from tyre 轮胎再生材料混凝土应用的环境评价
IF 1.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2022-12-05 DOI: 10.1680/jensu.22.00083
Eduardo García, M. Pradena, A. Schwarz, A. César, Bruno F. Urbano, Carlos Medina
Alternatives for using end-of-life tyres as a component of concrete are currently being studied. Particularly, granulated rubber and steel fibres from tyres can generate relevant technical benefits in concrete. However, it is not clear what environmental benefits these alternatives can provide. Hence, a study was carried out to evaluate, from an environmental perspective, applications of concrete with recycled materials from tyres. For this purpose, a streamlined life cycle assessment was developed to compare the impact of the use of concrete with tyre materials and traditional concrete for safety barriers, railway sleepers, pavements and masonry mortar. Furthermore, the analysis was based on energy-thermal simulations, experimental work and collected studies. The results indicated that the safety barrier and railway sleeper with tyres can reduce the harmful impact by 60% and 50%, respectively. For masonry mortar and concrete pavement applications, the impact reduction was between 4% and 10%. Moreover, one case was observed where, to comply with the technical requirements, it was necessary to incorporate more material into the concrete mix. This had a significant impact on the results, which meant that no environmental benefits were generated. Therefore, the study showed that to ensure the benefits of an application it was not only required to consider the technical advantages, but also the environmental savings that contributed to sustainable construction.
目前正在研究使用报废轮胎作为混凝土组成部分的替代方案。特别是,轮胎的颗粒橡胶和钢纤维可以在混凝土中产生相关的技术效益。然而,目前尚不清楚这些替代品能带来什么环境效益。因此,进行了一项研究,从环境的角度评估混凝土与轮胎回收材料的应用。为此,开发了一个简化的生命周期评估,以比较使用混凝土与轮胎材料和传统混凝土用于安全屏障、铁路枕木、人行道和砌体砂浆的影响。此外,分析是基于能量-热模拟,实验工作和收集的研究。结果表明,安全护栏和带轮胎的铁路轨枕可分别减少60%和50%的有害影响。对于砌体砂浆和混凝土路面应用,影响减少在4%到10%之间。此外,还观察到一种情况,为了符合技术要求,有必要在混凝土混合物中加入更多的材料。这对结果产生了重大影响,这意味着没有产生环境效益。因此,研究表明,为了确保应用程序的效益,不仅需要考虑技术优势,还需要考虑有助于可持续建筑的环境节约。
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引用次数: 0
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Proceedings of the Institution of Civil Engineers-Engineering Sustainability
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