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7th International Conference on Bituminous Mixtures and Pavements, ICONFBMP 2019

作者： Pasetto, M. Baldo, N. Manthos, E. Department of Civil Environmental and Architecture Engineering University of Padua Padua Italy Polytechnic Department of Engineering and Architecture University of Udine Udine Italy Department of Civil Engineering Aristotle University of Thessaloniki Thessaloniki Greece

ISBN: (纸本)9781138480285

The current paper deals with the numerical prediction of the mechanical response of Asphalt Concretes (AC) for flexible pavements, using Artificial Neural Networks (ANN). The AC mixes considered in the study were consisted of diabase aggregates and two different types of bitumen;a conventional bituminous binder and a polymer modified one. The ACs were produced in the laboratory and in a production plant. The ACs mechanical behaviour was investigated in terms of Marshall Stability, Flow, Quotient and Stiffness Modulus. The ANN used had one hidden layer and 10 artificial neurons. The results have been extremely satisfactory, with correlation coefficients in the testing phase within the range 0.98798 – 0.91024, demonstrating the feasibility of ANN prediction models’ application. Furthermore, a closed form equation has been with input parameters the production process, the bitumen type and content, the filler/bitumen ratio and the volumetric properties of the mixes. © 2019 Taylor & Francis Group, London.

关键词： Neural networks

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Particles Packing Enhancing Densification and Compressive Strength of High Performance Concretes (Hpc)

SSRN

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SSRN 2024年

作者： Kamseu, Elie Menkam, Franck Djadjeu Djiogue, Lauraine Tiogning Kueti Taybe, Ngaba Baenla, Jean Motcheyo, Herman Tcheneghon Leonelli, Cristina Elimbi, Antoine Laboratory of Applied Inorganic Chemistry Faculty of Science University of Yaounde 1 P.O. Box 812 Yaounde Cameroon Department of Computer Engineering National High School of Engineering University of Yaounde I P.O. Box 812 Cameroon Cameroon Civil Engineering-Architecture Laboratory National Polytechnic School University of Maroua P.O. Box 46 Maroua Cameroon Department of Chemical Engineering Higher Technical Teachers Training College University of Douala PO Box 1872 Douala Cameroon Department of Computer Science Faculty of Science University of Yaounde 1 P.O. Box 812 Yaounde Cameroon Laboratory of Materials Local Materials Promotion Authority MINRESI MIPROMALO P.O. Box 2396 Yaounde Cameroon Department of Engineering ‘‘Enzo Ferrari" University of Modena and Reggio Emilia Via P. Vivarelli 10 Modena41125 Italy Dipartimento di Chimica e Farmacia Italy

The optimal particle size distribution is achieved using ground aggregates used to fill the gap gradation between cement and sand as well as between sand and the coarses aggregates. The modified mathematical model was used to determine the particles size distribution for denser matrix.. Three classes of aggregates size were produce with diameters: 0.05 ̸ 1mm;0.1 ̸ 2mm and 0.25 ̸ 4mm. Portland cement of type CEM I 42.5, was used as a cementitious binder at a percentage of 25% by mass for the formulation of the concrete specimens. The results showed that, the optimum densification is achieved with the logarithmic granulometry curves.: Dmin = 0.5 mm and Dmax ≤ 4mm. The corresponding High Performance Concretes appeared homogeneous with dense microstructure and Compressive strength ≥ 70 MPa: low porosity (8.46%) and a low water absorption (4.10%). The results give solution for the prediction of the characterization of high-performance concretes. © 2024, The Authors. All rights reserved.

关键词： MATLAB

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Review and feasibility analysis of prefabricated recycled concrete structure

Review and feasibility analysis of prefabricated recycled co...

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第三届绿色建筑与环境管理国际学术会议

作者： X C MA W J LUO J YIN Department of Architecture and Civil Engineering City University of Hong Kong School of Civil Engineering Henan Polytechnic University

Recycled concrete is a resource utilization technology of building rubbish,which is of great significance to environmental protection and *** because prefabricated structure buildings adopt standardized design,factory production,information management,assembly construction and intelligent applications,it can meet the needs of sustainable *** combination of these two technologies can give full play to the environmental advantages of this *** article starts from the three aspects of work performance,mechanical performance and anti-seismic performance,and summarizes the research status and analyzes the feasibility of applying recycled concrete to prefabricated structures to promote the further integration of these two environmentally friendly construction technologies.

关键词： IOP Review and feasibility analysis of prefabricated recycled concrete structure

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Side Wind Effect on the Flow Behavior of the Window Plume 11th

Side Wind Effect on the Flow Behavior of the Window Plume

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11th Asia-Oceania Symposium on Fire Science and Technology, AOSFST 2018

作者： Li, Junmei Zhao, Yuhang Chow, W.K. Yue, T.K. Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing100124 China College of Architecture and Civil Engineering Beijing University of Technology Beijing100024 China Department of Building Services Engineering Research Centre for Fire Engineering The Hong Kong Polytechnic University Hong Kong

ISBN: (纸本)9789813291386

Wind action on the flow behavior of the window plume along the exterior wall of a building was studied by analytical and numerical methods. Heat release rate of fire and outside wind speed were varied in the study. It was found that the window plume would flow downward under side wind. Fire might spread to the room above the window when the wind speed was low. With the wind speed increasing, the plume would be blown to downward direction, giving hazardous conditions to rooms at downstream of the wind. The tilted angle of the window plume was derived by theoretical analysis. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Numerical methods

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Retraction notice to "Investigation of the ionic curing effect and performance of modified nano-montmorillonite on river sludge pastes: Influence of sludge substitution and MNMt dosage" [Constr. Build. Mater. 403 (2023) 133183] (Construction and Building Materials (2023) 403, (S0950061823029008), (10.1016/***.2023.133183))

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Construction and Building Materials 2025年 474卷

作者： Shi, Peng Falliano, Devid Marano, Giuseppe Carlo Huang, Yujie Chen, Zhuorui He, Bingjian Department of Structural Building and Geotechnical Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Turin10129 Italy Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Tower Company Limited by Shares Ganzhou Branch Ganzhou341600 China School of Civil Engineering & Architecture Wenzhou Polytechnic Wenzhou325035 China

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://***/locate/withdrawalpolicy). This paper has been retracted at the request of the authors and agreed by the Editor-in-Chief. The authors became aware that some of the data used in this study originates from researchers at the Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil engineering, Fuzhou University who were neither included as co-authors nor appropriately acknowledged in the publication. In the interest of maintaining the highest standards of scientific integrity, transparency, and fairness, the authors believe it is both necessary and ethical to withdraw this paper with the intent of resubmitting a corrected version subsequently. © 2025 Elsevier Ltd

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Retraction notice to “Investigation of the ionic curing effect and performance of modified nano-montmorillonite on river sludge pastes: Influence of sludge substitution and MNMt dosage” [Constr. Build. Mater., vol. 403 (2023) 133183]

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Construction and Building Materials 2025年 471卷

作者： Peng Shi Devid Falliano Giuseppe Carlo Marano Yujie Huang Zhuorui Chen Bingjian He Department of Structural Building and Geotechnical Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Turin 10129 Italy Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Tower Company Limited by shares Ganzhou Branch Ganzhou 341600 China School of Civil Engineering & Architecture Wenzhou Polytechnic Wenzhou 325035 China

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Composite geopolymer based on copper tailings: Mechanical properties, strength models and microstructure

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Journal of Environmental Chemical engineering 2025年第3期13卷

作者： Wei Wang Pengfei Wei Ping Jiang Na Li Fuyong Chu Jiajia Fu Xudong Wang School of Civil Engineering Shaoxing University Shaoxing 312000 China Department of Civil and Environmental Engineering National University of Singapore Singapore 117576 Singapore School of Civil Engineering and Architecture Wenzhou Polytechnic Wenzhou 325035 China School of Transportation Engineering Nanjing Tech University Nanjing 211816 China

Resourceful utilisation of tailings waste remains a hotspot in global research. While silica-aluminate-rich copper tailings can serve as raw materials for geopolymer preparation, their high Si/Al ratio significantly limits the geopolymerization degree. This study investigates the feasibility of developing copper tailings-based geopolymers for road base applications, using copper tailings as the primary raw material supplemented with 30 % soft soil, 15 % fly ash, and 5 % cement. The effect of NaOH content on the strength characteristics of copper tailings-based geopolymers was explored by the unconfined compressive strength test and triaxial test. The mineral composition and microstructure of copper tailings-based geopolymers specimens were characterised based on the microscopic technique. The results show that: (1) With the increase of NaOH content, the unconfined compressive strength of the copper tailings base polymer increases and then decreases, and reach the maximum value when the NaOH content is 1 %. Compared with the sample without NaOH, the addition of 1 % NaOH increased the unconfined compressive strength by 47 % at the early stage and 69 % at 28d curing age. (2) An optimal NaOH content significantly improves the shear performance of the copper tailings-based polymer, primarily by enhancing its cohesion. Triaxial test results demonstrate that 1 % NaOH addition increases cohesion by 73 % at 28d curing age. (3) The NaOH promotes the formation of geopolymer gel, refines the pore structure, and increases sample density, thereby enhancing strength. Overall, the research results can provide a reference for the application of copper tailings solid waste in roadbed materials.

关键词： Compressive strength

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Effect of redesigning school furniture based on students’ anthropometry in North-West Nigeria 20th

Effect of redesigning school furniture based on students’ a...

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20th Congress of the International Ergonomics Association, IEA 2018

作者： Adeyemi, Ademola James Ojile, Paul Abdulkadir, Muyideen Lasisi, Olusegun Isa Department of Mechanical Engineering Waziri Umaru Federal Polytechnic Birnin Kebbi Nigeria Department of Architecture Waziri Umaru Federal Polytechnic Birnin Kebbi Nigeria

ISBN: (纸本)9783319960647

Mismatch between classroom furniture and the students’ anthropometry have been identified as a major cause of musculoskeletal disorders (MSDs) among schoolchildren. This paper is aimed at investigating the prevalence of MSDs and the effect of furniture intervention among students of tertiary institutions in Northwest Nigeria. The Cornell’s MSD questionnaire was used to investigate the prevalence of MSDs in different body regions of 174 students aged between 17 and 25 years. Eleven students’ anthropometric measures, relevant to furniture design, were gathered using appropriate equipment. Standardized regression equations for furniture design were used to compute the ergonomically compliant furniture dimensions for the participants. A new set of ergonomically designed furniture using the students’ anthropometry was introduced and the Cornell’s MSD questionnaire was used to investigate if the intervention made was significant or not. The first findings based on the questionnaire shows a high prevalent rate of MSDs especially at the back, neck and upper back among the students. Comparison of the obtained dimensions from the students’ anthropometry with that of the existing furniture shows significant level of mismatch. The most significant variations were identified in the elbow height/Table height, and popliteal/seat height. New furniture compactible with the students’ anthropometry was introduced in one of the institutions and a retest using the Cornell’s MSD shows a reduction in the prevalence rate among the students. However, there is still need for ergonomic enlightenment on safe study posture to further reduce the occurrence of MSDs. © Springer Nature Switzerland AG 2019.

关键词： Anthropometry

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Predicting Dynamic Thermal Sensation (Dts) in Outdoor Settings

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SSRN 2022年

作者： Liu, Sijie Nazarian, Negin Hart, Melissa Anne Niu, Jianlei Xie, Yongxin de Dear, Richard Faculty of Built Environment University of New South Wales Sydney Australia ARC Centre of Excellence for Climate Extremes University of New South Wales Sydney Australia Department of Building Services Engineering The Hong Kong Polytechnic University Hong Kong School of Architecture Design and Planning The University of Sydney Sydney Australia

Past outdoor thermal comfort research has mainly focused on steady-state exposure mainly because outdoor environments are highly dynamic. This study investigated dynamic thermal sensations through a series of field studies conducted in Sydney, Australia with 65 participants exposed to three different outdoor scenarios including both rapid changes in ambient environments and different activity levels. Two predictive approaches for thermal sensation were evaluated including using a) steady-state thermal indices PET, SET*, and UTCI, and b) dynamic thermal sensation (DTS) models from Fiala and Lai. Predicted thermal sensation results indicate that steady-state thermal indices can explain most of the variance in thermal sensation under outdoor environments if subjects’ activity levels are low. We further compare and improve DTS models by considering additional physiological variables and updated the coefficients derived from our field studies. Heat flux and the change rate of heat flux demonstrated strong ability to capture the thermal sensation change during high level activities and rapidly changing environments, respectively. Compared to the traditional methods by mapping thermal indices onto the thermal sensation scale. The outcome of this research provides a method to capture more nuanced dynamic variability in thermal sensations as urban residents go about their lives in urban settings. © 2022, The Authors. All rights reserved.

关键词： Heat flux

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Low-Carbon and Greener Mortars Prepared by Industrial Waste-Based Cement and Copper Mining Wastewater

SSRN

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SSRN 2022年

作者： Wang, Cheng Chen, Peiyuan Xu, Ying Wang, Zhouhe Ding, Peng Li, Jin Wang, Aiguo School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan232001 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Anhui Copper Crown Industrial Technology Research Institute Co. LTD Tongling244000 China Anhui Province Engineering Laboratory of Advanced Construction materials Anhui Jianzhu University Hefei230601 China

Copper tailings is normally in the state of wet conditions rather than dry conditions as used in lab by previous researchers. The use of wet copper tailings containing mining wastewater as the feedstock of cement-based materials could be more meaningful and practical. Nevertheless, prior to the application of wet copper tailings, the influence of copper mining wastewater (CMw) on the hydration of cement and the performance of cement-based materials should be preferentially investigated and understood. In this regard, this study was conducted to upgrade CMw as a source of mixing water to prepare industrial waste-based low-clinker cement (Lcc) mortars to avoid the incompatible problems between CMw and ordinary Portland cement. Experimental results indicated that the addition of CMw exerted both accelerating and retarding effects on the hydration of Lcc due to its complex composition. The accelerating effect dominated when a proper amount of CMw has been used, i.e. 50%. On that addition of CMw, the compressive strength of Lcc mortar can be increased by 3.5% at 3d, 5.21% at 7d, and 8.75% at 28d, respectively. In addition, the porosity of Lcc mortars was also decreased by 5.0%-14% by the addition CMw. In summary, a low-cost, environmentally friendly, and simple utilization method of CMw was proposed. © 2022, The Authors. All rights reserved.

关键词： Hydration

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