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construction Research Congress 2024, CRC 2024

作者： Hajiashrafi, Fatemeh Huynh, Huu T. Lucko, Gunnar Eid, Mohamed S. Construction Engineering and Management Program Dept. of Civil and Environmental Engineering Catholic Univ. of America WashingtonDC United States Dept. of Civil and Environmental Engineering Catholic Univ. of America WashingtonDC United States Dept. of Construction and Building Engineering College of Engineering and Technology Arab Academy for Science Technology and Maritime Transport Cairo Egypt

ISBN: (数字)9780784485286

ISBN: (纸本)9780784485286

Despite various attempts throughout past decades to deal with concurrent delays in construction project schedules, they continue to be a vexing issue that has eluded an unambiguous solution. Prior studies have resorted to the prime contract, which only binds general contractor and owner, cannot be proven to be fair, and may even be biased. Therefore, this paper adopts a concept from cooperative game theory, the Shapley value, which apportions profits (which project participants seek to maximize). Creatively applying it to liquidated damages (which they seek to minimize), the model uses all participants' actual finish dates as input to gain percentage shares of liquidated damages as output. Analyzing all possible coalitions among participants and assigning weights comprehensively assesses their marginal contributions to the project finish date. This generalized view of participants explicitly includes subcontractors, whom prior approaches typically ignored. An example demonstrates how the model also implies an early completion bonus. This yields compelling implications for real-world incentives that can be cast into future contract clauses. © ASCE.

关键词： Contractors

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Densified mixture design algorithm: A novel mix design concept and its application for green concretes incorporating industrial by-products

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Environmental Progress and Sustainable Energy 2023年第4期42卷 e14086-e14086页

作者： Nguyen, Tan-Hung Limongan, Andrian H. Nguyen, May Huu Hwang, Chao-Lung Huynh, Trong-Phuoc Department of Civil Engineering Can Tho University of Technology Can Tho Viet Nam Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Bridge and Tunnel Faculty of Civil Engineering University of Transport Technology Hanoi Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Despite the fact that densified mixture design algorithm (DMDA) has been identified as a promising tool for green concrete mix design, its use in real practice has still been minimal worldwide. Due to the lack of precise information on DMDA computation in earlier studies, this work proposes DMDA including fly ash and ground granulated blast-furnace slag as a viable way to improve the long-term performance of green concrete. To encourage the use of DMDA, this study offers a detailed description of the DMDA mix design, as well as a step-by-step standard operating procedure and an empirical example of the computation. Assessments of the long-term performance of green mixtures (self-consolidating concrete and high-performance concrete) and ordinary Portland cement concrete (designed using the conventional method of American Concrete Institute, ACI) were made. Performances of the ACI (O6000 mixture) and DMDA concretes (S6000 and H6000 mixtures) were then compared in terms of compressive strength, elastic modulus, shrinkage, and creep strain. As a result, all of the concrete samples attained the target strength of above 41 MPa (6000 psi) after only 28 days. Moreover, compressive strength, elastic modulus, shrinkage, and creep strain increased significantly in all of the concretes over curing time. Importantly, the experimental results confirmed that both types of DMDA concrete exhibited higher compressive strength and better long-term performance than the ACI concrete under elastic modulus, creep, and shrinkage aspects. © 2023 American Institute of Chemical Engineers.

关键词： Compressive strength

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Influence of rice husk ash and hybrid fiber on engineering properties of densified high-performance fiber-reinforced concrete

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Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 2023年第11期237卷 2845-2857页

作者： Vo, Duy-Hai Nguyen, Minh-Hieu Nguyen, May Huu Hwang, Chao-Lung Huynh, Trong-Phuoc The University of Danang University of Technology and Education Danang Viet Nam Vinh Long Department of Construction Vinh Long Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan Department of Bridge and Tunnel Faculty of Civil Engineering University of Transport Technology Hanoi Viet Nam Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Conventional concrete significantly affects the environment due to high CO2 emission into the atmosphere during the production process. In order to improve concrete performance and arrest the incidence of global warming, the use of additive materials for cement replacement has been promoted worldwide. This study was designed to investigate the mechanical properties of high-performance fiber-reinforced concrete (HFRC) produced using rice husk ash (RHA) and hybrid fiber (HF) in accordance with the densified mixture design algorithm (DMDA) mix design method. Samples were produced using RHA as a direct replacement for cement at 10%, 20%, and 30%. HF, comprising steel and polypropylene fibers, was added (by volume) to the 20% RHA group mixture to improve the HFRC sample properties. Based on the experimental results, higher RHA contents had a generally negative effect on the fresh properties of the HFRC mixtures. Compressive strength values ranged from 53 to 72 MPa with various RHA and HF content. RHA replacement levels up to 20% had an insignificant effect on the strength development and dynamic modulus of the HFRC samples. However, the addition of HF improved splitting tensile strength, flexural strength, and dynamic modulus remarkably at all curing ages. Furthermore, the 91-day drying shrinkage was in the ranges of 0.032%–0.039% and 0.023%–0.034% using different RHA and HF levels, respectively. Increasing both RHA and HF contents significantly reduced drying shrinkage in the samples. Multivariable regression was also performed, clarifying that all tested results were consistent and had good correlations. The results of this study also provide a potentially effective use for abundantly available industrial waste products such as fly ash (FA) and RHA to promote the production of greener and more sustainable concrete. © IMechE 2023.

关键词： Bending strength

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Perceptions and Pedagogical Responses of construction Educators During COVID-19

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International Journal of construction Education and Research 2023年第4期19卷 405-425页

作者： Langar, Sandeep Mosier, Rachel Adhikari, Sanjeev School of Civil and Environmental Engineering and Construction Management The University of Texas at San Antonio San Antonio TX United States Francis and Kathleen Rooney Construction Engineering Technology Program Oklahoma State University Stillwater OK United States Department of Construction Management Kennesaw State University Atlanta GA United States

COVID-19 impacted academia across the globe. Given the scale and sudden pandemic onset, limited empirical studies identify the transition’s impact on the US construction educators and education imparted. The study determined the pedagogical responses of educators associated with construction programs within the US during COVID-19 and tested six relationships in the areas of university support, technological access and infrastructure, and educator proficiency improvements. An online survey method was utilized with the instrument emailed to nearly 1,883 educators associated with construction programs/departments across the US. The study used 163 complete responses from US educators based on predefined parameters and identified the baseline operational paradigm (pre-COVID) for construction educators and programs across the US. The study determined the changes after the transition and investigated the impacts of the transition on faculty proficiency with online teaching, existing technological infrastructure, and communication with students. The study identified a moderate relationship between the University’s level of support and educators’ experiences in developing and delivering online materials during the transition. A moderate relationship was also identified between proficiency with online content delivery and total teaching experience. Finally, only a few respondents felt construction education could be delivered entirely online, based on their experiences. © 2022 Associated Schools of construction.

关键词： construction educators COVID-19 impacts on academia online education pedagogical responses to COVID-19

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Flood Management Strategies in Indonesia: A Lesson Learned from Pepe River, Central Java 5th

Flood Management Strategies in Indonesia: A Lesson Learned f...

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5th International Conference on Rehabilitation and Maintenance in civil engineering, ICRMCE 2021

作者： Prastica, Rian Mantasa Salve Wijayanti, Amalia Civil Engineering Department Gadjah Mada University Yogyakarta55281 Indonesia Water Infrastructure Construction Technology Study Program Public Works Polytechnic Semarang50275 Indonesia

ISBN: (纸本)9789811693472

Floods occur every year and threaten communities worldwide. Indonesia is among the countries faced with this problem and still struggling to seek practical solutions to date. Further, as the country’s centers of trade, business, and technology, the island of Java cannot even perform better in dealing with floods. To further understand possible damage and losses, this research investigated structural mitigation measures as part of flood management in the Pepe River, notably river channelization to increase hydraulic efficiency. For the analysis, it used HEC-RAS to observe the river capacity. Existing conditions revealed that the river could not accommodate the predicted floods based on the return periods derived from the synthetic unit hydrograph of Nakayasu. However, after running the mitigation scenario wherein hydraulic modification was applied, flood risk could be reduced by lowering the river water level. Based on the results, it can be concluded that Indonesia needs to pay more attention to other aspects: ecology, green infrastructure, and water governance, to achieve more effective flood mitigation measures because structural mitigation only provides a temporary solution. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Rivers

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Insights on the irrigation conveyance efficiency of three canal systems for improving agricultural sustainability in Sri Lanka

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Water Supply 2025年第5期25卷 807-824页

作者： Sumanasekara, Harindu S. Jayasinghe, Ananda Herath, Anjana B. Siriwardhana, Kushan D. Imbulana, Indra L. Mullegamgoda, Kithsiri Herath, Ruchiru Paranavithana, Ganila Rathnayake, Upaka 07 Colombo Sri Lanka Improving System Efficiencies and Water Productivity Project Mahaweli Water Security Investment Program 10 Colombo Sri Lanka Engineering and Design Center Faculty of Engineering University of Peradeniya Peradeniya20400 Sri Lanka Water Resources Management and Soft Computing Research Laboratory Millennium City Athurugiriya10150 Sri Lanka Department of Civil Engineering Faculty of Engineering Technology The Open University of Sri Lanka Nugegoda10250 Sri Lanka Department of Civil Engineering and Construction Faculty of Engineering and Design Atlantic Technological University SligoF91 YW50 Ireland

System conveyance efficiency of the canals is highly important in planning new irrigation development schemes. Enhancing the efficiencies directly influences sustainable agricultural practices. This study, conducted in 2022–2023, assessed conveyance losses in three major irrigation schemes in Sri Lanka: Maduru Oya, Hurulu Wewa, and Minipe Left Bank Canal. The research aimed to quantify current conveyance losses and identify factors influencing efficiency to inform rehabilitation efforts. Field measurements were taken using the float method to determine flow rates at multiple points along selected canals. Conveyance losses were calculated as the percentage difference in flow between measurement points. Results showed significant variations in losses across the three systems: Maduru Oya averaged 27.8% (standard deviation (SD) = 6.03%), Hurulu Wewa 26.5% (SD = 20.4%), and Minipe Left Bank Canal 33.1% (SD = 15.4%) for the D47 canal and 27.7% (SD = 23.7%) for the D32 canal. Factors observed to influence conveyance losses included canal lining condition, soil texture, and topographical features such as elevation differences between drainage and field canals. The study concludes that targeted rehabilitation efforts, particularly increased lining in high-loss areas and improved maintenance in tail-end sections, could substantially improve system efficiency. These findings provide crucial data for irrigation planners and policymakers in Sri Lankan agriculture. © 2025 The Authors.

关键词： Infiltration

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比较三种稳定剂对FeS纳米颗粒的稳定效果及对水土中镉的固定与去除性能的影响

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Journal of Central South University 2024年第4期31卷 1064-1075页

作者：田舒婷赵东叶霍丽娟马骏杨睿 Department of Environmental Science School of Environment and ResourcesTaiyuan University of Science and TechnologyTaiyuan 030024China Environmental Engineering Program Department of Civil&Environmental EngineeringAuburn UniversityAuburnAL 36849USA Department of Civil Constructionand Environmental EngineeringSan Diego State UniversitySan DiegoCA 92182USA

本研究评估了三种多糖稳定剂(羧甲基纤维素钠(CMC)、羧甲基淀粉钠(CMS)和一种水溶性淀粉)用于稳定FeS纳米颗粒的有效性,并测试了相应稳定化纳米颗粒在水和土壤中固定Cd^(2+)的性能。使用0.010 wt%CMC、0.025 wt%CMS或0.065 wt%淀粉可获... 详细信息

本研究评估了三种多糖稳定剂(羧甲基纤维素钠(CMC)、羧甲基淀粉钠(CMS)和一种水溶性淀粉)用于稳定FeS纳米颗粒的有效性,并测试了相应稳定化纳米颗粒在水和土壤中固定Cd^(2+)的性能。使用0.010 wt%CMC、0.025 wt%CMS或0.065 wt%淀粉可获得完全稳定的FeS纳米颗粒(100 mg/L FeS)。CMC-FeS表现出较高的zeta负电位,淀粉-FeS保持中性,而CMS-FeS则表现出中等负电位。CMCFeS对Cd^(2+)的吸附速率最快,吸附容量也最高。当用100 mg/L CMC-FeS或CMS-FeS处理一种含Cd土壤(58.3 mg/kg Cd)后,Cd的TCLP浸出率分别降低了88.4%和68.0%。CMC-FeS和CMS-FeS均可在模型土壤中运移,显示出其在土壤中原位固定Cd^(2+)方面的潜力。土壤穿透曲线实验表明,CMC-FeS在4.5个孔体积,CMS-FeS在约25个孔体积处几乎完全穿透。柱实验结果表明,当用55个孔体积的CMC-FeS或CMS-FeS悬浮液(100 mg/L)处理该含Cd土壤后,Cd的水浸出率分别降低了98.2%和98.0%。根据目标污染物、材料在土壤中的传输特性和材料成本,可找到这三种稳定剂在土壤修复中的最佳应用。

关键词：硫化铁纳米颗粒稳定剂重金属污染物固定土壤修复地下水污染

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Interface Performance of Untreated Dracaena trifasciata Fibers in Epoxy Composites

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Fibers and Polymers 2025年 1-10页

作者： Minillo, Larissa Queiroz Fabiche, Mariana Natale Fiorelli Ambrosio, Vanessa Carolina Lombardi de Castro Cardoso, Bruno César Ortenzi, Altibano Post-Graduate Program in Materials Science and Engineering Federal University of Paraná Curitiba Brazil Post-Graduate Program in Civil Engineering and Building Technology State University of Maringá Umuarama Brazil Post-Graduate Program in Civil Engineering State University of Londrina Londrina Brazil Post-Graduate Program in Construction Management and Building Technologies University of Western São Paulo Presidente Prudente Brazil

This study evaluates the potential of Dracaena trifasciata (DT) fibers as reinforcement in epoxy composites by analyzing mechanical, thermal, and microstructural properties. Fibers underwent water-retting and drying, and were characterized via SEM and FTIR. Composites were fabricated by vacuum infusion with 55% fiber volume fraction and tested according to ASTM D638. Two epoxy systems were investigated: a rigid matrix (LY5052) and a flexible matrix (AR324). With LY5052, DT fiber incorporation led to a 101% increase in elastic modulus but caused a 26% reduction in tensile strength, attributed to stress concentration at the fiber–matrix interface and brittle matrix behavior. In contrast, composites with AR324 exhibited a 908% increase in stiffness and nearly 1000% improvement in tensile strength, enabled by superior strain compatibility between the flexible matrix and the fiber reinforcement. TGA analysis showed thermal stability above 400 °C and ~ 5% increase in residual mass due to inorganic components in DT fibers. SEM revealed predominant fiber pull-out, 40 µm voids, and resin penetration into the fiber lumen. These findings highlight the importance of matrix selection in maximizing the mechanical potential of natural fibers. DT/epoxy composites are promising for lightweight applications, particularly when paired with ductile matrices that mitigate premature failure mechanisms.

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Characteristics of self-compacting green concrete

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Discover civil engineering 2024年第1期1卷 1-14页

作者： Lim, Hung Ling Mannan, Mohammad Abdul Fakhri, Rana Shamseldeen Dawood, Eethar Thanon Teo, Delsye Ching Lee Tasnim, Sadia Department of Civil Engineering Faculty of Engineering Universiti Malaysia Sarawak (UNIMAS) Kota Samarahan Malaysia Department of Building and Construction Engineering Technical College of Mosul Northern Technical University Mosul Iraq Bachelor of Engineering Technology (Civil) Program Department of Business and Construction (Higher Education) Melbourne Polytechnic Epping Australia Applied Engineering South Metropolitan TAFE Munster Australia

Locally, conventional concrete is still created utilizing river sand and crushed stone as filer materials. The massive quarry dust by-product remain untapped in the production of concrete. The coal-fired power station produce significant quantities of Type F fly ash. Self-compacting concrete (SCC) provides many advantages for creating high-quality concrete. Consequently, the main objective of this research is to create a mix design for high-strength SCC utilizing a binary blends, hybrid fibers and fine aggregates that meet both hardened and fresh concrete characteristics. The study is conducted in amendment of w/b ratio, superplasticizer, proportion of fine aggregate to coarse aggregate, optimumal cement replacing by fly ash, dosage of low macro fibre and micro fibre. Mix-50c-X is the best mix design that was produced. The mix quantity for 1m3 concrete was 315 kg Class F fly ash, 315 kg OPC, 630 kg quarry dust, 508 kg river sand, 400 kg coarse aggregate, 0.7% superplasticizer,0.32% w/b, 0.10% macro fiber, and 0.01% micro fiber. This SCC mixture showed fresh characteristics as well as compressive strengths of more than 22 MPa and 62 MPa after 1 day and 28 days, respectively. The results of high-strength SCC demonstrated the enormous potential for the local construction, especially precast product.

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Massive plywood panels and manufacturers: a comprehensive systematic literature review and case study

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Discover civil engineering 2025年第1期2卷 1-24页

作者： De Araujo, Victor Alves, Larissa Jardim, Pedro Švajlenka, Jozef Christoforo, André Post-Graduation Program in Civil Engineering São Paulo State University Ilha Solteira Brazil Department of Civil Engineering Federal University of São Carlos São Carlos Brazil Department of Civil Engineering Federal University of Rondônia Porto Velho Brazil Department of Construction Technology Economy and Management Technical University of Košice Košice Slovakia

Massive timber is a category of heavy green engineered products, manufactured from glued or glued-free processes, to be used in more predictable structural performance in industrialized walls, floors and frames. Massive plywood panel emerges as a novelty for mass timber construction and, therefore, little information is scientifically available. Aligning with the Sustainable Development Goal 9: ‘Industry, innovation and infrastructures’, this study aims to verify this literature gap and raise topics regarding massive plywood panels using a structured systematic review literature. From bibliometric analysis, 12 journal papers, 10 conference papers and an editorial were prospected using Scopus and Web of Science databases. A predominance of studies from English language nations was confirmed. Seismic and monotonic performance of massive plywood are frequent topics in these investigations, whose results have indicated a promising scenario for construction. As no study on industry is available, a case study on massive plywood was sequentially developed to discuss features of commercial panels and perspectives of respective global industry. The North American Freres Engineered Wood and Finnish Metsä Wood are the only active manufacturers, and their massive plywood panels have been manufactured from modern production technologies and environmentally certified practices to be applied in low- and high-rise industrialized buildings.

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