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Yahong Dong
Qingdao Research Center for Green Development and Ecological Environment, Qingdao University of Science and Technology, No. 99 Songling Road, Qingdao 266061, China

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Journal article
Published: 12 August 2021 in Sustainability
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The inconsistency caused by different life cycle impact assessment (LCIA) methods is a long-term challenge for the life cycle assessment (LCA) community. It is necessary to systematically analyze the differences caused by LCIA methods and facilitate the fair comparison of LCA results. This study proposes an effective method of conversion factors (CFs) for converting the results of 8 LCIA methods for 14 impact categories and then demonstrates its application in the construction sector. Correlation analyses of the datasets of construction materials are conducted to develop CFs for the impact categories. A set of conversion cards are devised to present the CFs and the associated correlation information for the LCIA methods. It is revealed that the differences between LCIA methods are largely caused by the characterization methods, rather than due to the metrics. A comparison based only on the same metrics but ignoring the underlying LCIA mechanisms is misleading. High correlations are observed for the impact categories of climate change, acidification, eutrophication, and resource depletion. The developed CFs and conversion cards can greatly help LCA practitioners in the fair comparison of LCA results from different LCIA methods. Case studies are conducted, and verify that by applying the CFs the seemingly incomparable results from different LCIA methods become comparable. The CF method addresses the inconsistency problem of LCIA methods in a practical manner and helps improve the comparability and reliability of LCA studies in the construction sector. Suggestions are provided for the further development of LCIA conversion factors.

ACS Style

Yahong Dong; Uzzal Hossain; Hongyang Li; Peng Liu. Developing Conversion Factors of LCIA Methods for Comparison of LCA Results in the Construction Sector. Sustainability 2021, 13, 9016 .

AMA Style

Yahong Dong, Uzzal Hossain, Hongyang Li, Peng Liu. Developing Conversion Factors of LCIA Methods for Comparison of LCA Results in the Construction Sector. Sustainability. 2021; 13 (16):9016.

Chicago/Turabian Style

Yahong Dong; Uzzal Hossain; Hongyang Li; Peng Liu. 2021. "Developing Conversion Factors of LCIA Methods for Comparison of LCA Results in the Construction Sector." Sustainability 13, no. 16: 9016.

Journal article
Published: 08 July 2021 in Waste Management
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Considering the volume of plastic generation and its persistence in nature, the management of plastic wastes has gained increasing attention globally. To select the most environmentally sustainable solution, insights in the environmental impacts of different management strategies are crucial. This study thus aimed to evaluate different plastic waste management strategies such as mechanical recycling, incineration, industrial incineration, construction and landfill, and exemplified with potential case demonstrations in Hong Kong. The environmental impacts of the developed strategies are comparatively evaluated by the lifecycle assessment (LCA) technique in order to identify the most environmentally preferable strategy. The LCA results indicate that industrial incineration is the most potential preferential strategy for Hong Kong, as it can potentially consume the generated waste locally and substitute the imported coal for the cement industry. Mechanical recycling is the second preferential strategy for the city, as it conserves secondary resources significantly. Grate incineration for generating electricity is the third preferable solution, while the use of recycled plastics in construction may not be a benign environmental strategy for Hong Kong. The findings of this study could help policy makers to design strategic direction for environmentally sustainable management of plastic wastes locally based on the circular economy principle.

ACS Style

Uzzal Hossain; S. Thomas Ng; Yahong Dong; Ben Amor. Strategies for mitigating plastic wastes management problem: A lifecycle assessment study in Hong Kong. Waste Management 2021, 131, 412 -422.

AMA Style

Uzzal Hossain, S. Thomas Ng, Yahong Dong, Ben Amor. Strategies for mitigating plastic wastes management problem: A lifecycle assessment study in Hong Kong. Waste Management. 2021; 131 ():412-422.

Chicago/Turabian Style

Uzzal Hossain; S. Thomas Ng; Yahong Dong; Ben Amor. 2021. "Strategies for mitigating plastic wastes management problem: A lifecycle assessment study in Hong Kong." Waste Management 131, no. : 412-422.

Journal article
Published: 01 December 2018 in Journal of Urban Planning and Development
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The development of public construction megaprojects in China has been booming during the last decade, and projects of this type are expected to achieve sustainability economically, socially, and environmentally. Despite this, their social sustainability level is relatively low and is yet to be improved. A potentially important reason is the lack of a comprehensive evaluation mechanism to determine if public megaprojects are socially sustainable in the Chinese context. As a prelude to the development of such a mechanism, this paper provides a thorough and comprehensive analysis of the various social sustainability indicators (SSIs) involved from a multistakeholder perspective. Different research methods (e.g., literature review and questionnaire survey) are adopted to collect the relevant information, both locally and internationally. The data are then analyzed with various statistical techniques in terms of mean score ranking, tests of Kendall’s coefficient of concordance, Spearman’s rank correlation, and factor analysis. The results uncover six sets of SSIs: improved quality of daily life, appropriate macropolicies, harmonious connections with the surroundings, unique local identity, effective public participation, and others. The work is validated by interviews, and the comments raised by the interviewees are reported. The research findings are expected to benefit both the government and the construction industry at large for better addressing social concerns when delivering public megaprojects in China.

ACS Style

Hongyang Li; Xiaoling Zhang; S. Thomas Ng; Martin Skitmore; Yahong Dong. Social Sustainability Indicators of Public Construction Megaprojects in China. Journal of Urban Planning and Development 2018, 144, 04018034 .

AMA Style

Hongyang Li, Xiaoling Zhang, S. Thomas Ng, Martin Skitmore, Yahong Dong. Social Sustainability Indicators of Public Construction Megaprojects in China. Journal of Urban Planning and Development. 2018; 144 (4):04018034.

Chicago/Turabian Style

Hongyang Li; Xiaoling Zhang; S. Thomas Ng; Martin Skitmore; Yahong Dong. 2018. "Social Sustainability Indicators of Public Construction Megaprojects in China." Journal of Urban Planning and Development 144, no. 4: 04018034.

Journal article
Published: 01 February 2018 in Renewable and Sustainable Energy Reviews
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ACS Style

Uzzal Hossain; Chi Sun Poon; Yahong Dong; Dongxing Xuan. Evaluation of environmental impact distribution methods for supplementary cementitious materials. Renewable and Sustainable Energy Reviews 2018, 82, 597 -608.

AMA Style

Uzzal Hossain, Chi Sun Poon, Yahong Dong, Dongxing Xuan. Evaluation of environmental impact distribution methods for supplementary cementitious materials. Renewable and Sustainable Energy Reviews. 2018; 82 ():597-608.

Chicago/Turabian Style

Uzzal Hossain; Chi Sun Poon; Yahong Dong; Dongxing Xuan. 2018. "Evaluation of environmental impact distribution methods for supplementary cementitious materials." Renewable and Sustainable Energy Reviews 82, no. : 597-608.

Societal lca
Published: 01 August 2017 in The International Journal of Life Cycle Assessment
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Sustainability analysis should include the assessment of the environmental, social, and economic impacts throughout the life cycle of a product. However, the social sustainability performance assessment is seldom carried out during materials selection due to its complex nature and the lack of a social life cycle assessment tool. This study presents a single score-based social life cycle assessment methodology, namely social sustainability grading model, for assessing and comparing the social sustainability performance of construction materials using a case study on recycled and natural construction materials. The proposed method is developed based on the methodological framework provided by the United Nations Environment Programme/Society of Environmental Toxicology and Chemistry guidelines published in 2009 and the methodological sheets published in 2013, the indicators and sustainability reporting guidelines provided by the Global Reporting Initiatives and ISO 26000 for social responsibility of products, and the indicators provided by the Hong Kong Business Environment Council Limited for construction sustainability. A twofold research approach is proposed in this model: the first one is the qualitative research based on expert interviews to identify, select, and prioritize the relevant subcategories and indicators, and the second one is the operational research based on the case-specific survey to collect the required data. A social sustainability index was proposed for the interpretation of the results effectively. A case study on construction materials was conducted to illustrate the implementation of the method using case-specific first-hand data. The major outcome of this study is the systematic development of a social sustainability assessment tool based on the established standards and guidelines. The case study showed that four subcategories are crucial social concerns for construction materials (i.e., health and safety issues of the materials, health and safety of workers, company’s commitment to sustainability, and company’s policies on energy and water consumption). Based on the sustainability index proposed, using recycled aggregates from locally generated waste materials scored higher (about 31–34%) social sustainability than using imported natural aggregates. In addition, recycled aggregates and natural aggregates achieved “sustainable” and “neutral” rating sustainability levels, respectively. However, several subcategories (e.g., health and safety, working hour, forced work, training and social benefits of workers, and quality of the materials and information disclosing to public) are still needed to improve the social sustainability performance of recycled aggregates. An integrated social life cycle assessment method is presented in this study for assessing the social sustainability of construction materials. In addition, the reported case study in this paper is one of the first attempts for social sustainability assessment of recycled construction materials, and the method can be applied to other recycled materials/products for comparative analysis. However, several critical factors, such as integration in other life cycle methods and software, sensitivity analysis, and more case studies, are still needed for further improvement of the developed method.

ACS Style

Uzzal Hossain; Chi Sun Poon; Yahong Dong; Irene M. C. Lo; Jack C. P. Cheng. Development of social sustainability assessment method and a comparative case study on assessing recycled construction materials. The International Journal of Life Cycle Assessment 2017, 23, 1654 -1674.

AMA Style

Uzzal Hossain, Chi Sun Poon, Yahong Dong, Irene M. C. Lo, Jack C. P. Cheng. Development of social sustainability assessment method and a comparative case study on assessing recycled construction materials. The International Journal of Life Cycle Assessment. 2017; 23 (8):1654-1674.

Chicago/Turabian Style

Uzzal Hossain; Chi Sun Poon; Yahong Dong; Irene M. C. Lo; Jack C. P. Cheng. 2017. "Development of social sustainability assessment method and a comparative case study on assessing recycled construction materials." The International Journal of Life Cycle Assessment 23, no. 8: 1654-1674.

Journal article
Published: 01 April 2017 in Journal of Cleaner Production
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ACS Style

Yahong Dong; Alicia Kyoungjin An; Yuk Shing Yan; Sora Yi. Hong Kong's greenhouse gas emissions from the waste sector and its projected changes by integrated waste management facilities. Journal of Cleaner Production 2017, 149, 690 -700.

AMA Style

Yahong Dong, Alicia Kyoungjin An, Yuk Shing Yan, Sora Yi. Hong Kong's greenhouse gas emissions from the waste sector and its projected changes by integrated waste management facilities. Journal of Cleaner Production. 2017; 149 ():690-700.

Chicago/Turabian Style

Yahong Dong; Alicia Kyoungjin An; Yuk Shing Yan; Sora Yi. 2017. "Hong Kong's greenhouse gas emissions from the waste sector and its projected changes by integrated waste management facilities." Journal of Cleaner Production 149, no. : 690-700.

Journal article
Published: 17 February 2016 in The International Journal of Life Cycle Assessment
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Life cycle sustainability assessment (LCSA) is a method that combines three life cycle techniques, viz. environmental life cycle assessment (LCA), life cycle costing (LCC), and social life cycle assessment (S-LCA). This study is intended to develop a LCSA framework and a case study of LCSA for building construction projects. A LCSA framework is proposed to combine the three life cycle techniques. In the modeling phases, three life cycle models are used in the LCSA framework, namely the environmental model of construction (EMoC), cost model of construction (CMoC), and social-impact model of construction (SMoC). A residential building project is applied to the proposed LCSA framework from “cradle to the end of construction” processes to unveil the limitations and future research needs of the LCSA framework. It is found that material extraction and manufacturing account for over 90 % to the environmental impacts while they contribute to 61 % to the construction cost. In terms of social impacts, on-site construction performs better than material extraction and manufacturing, and on-site construction has larger contributions to the positive social impacts. The model outcomes are validated through interviews with local experts in Hong Kong. The result indicates that the performance of the models is generally satisfactory. The case study has confirmed that LCSA is feasible. Being one of the first applications of LCSA on building construction, this study fulfills the current research gap and paves the way for future development of LCSA.

ACS Style

Yahong Dong; S. Thomas Ng. A modeling framework to evaluate sustainability of building construction based on LCSA. The International Journal of Life Cycle Assessment 2016, 21, 555 -568.

AMA Style

Yahong Dong, S. Thomas Ng. A modeling framework to evaluate sustainability of building construction based on LCSA. The International Journal of Life Cycle Assessment. 2016; 21 (4):555-568.

Chicago/Turabian Style

Yahong Dong; S. Thomas Ng. 2016. "A modeling framework to evaluate sustainability of building construction based on LCSA." The International Journal of Life Cycle Assessment 21, no. 4: 555-568.

Journal article
Published: 01 November 2015 in Construction and Building Materials
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Buildings are one of the primary contributors to carbon emissions. Given the small size of construction site and increasing housing demand in Hong Kong, precast concrete has been frequently adopted in not only public residential buildings, but also the private sector. This study compares the carbon emissions of precast and traditional cast-in-situ construction methods based on a case study of a private residential building in Hong Kong. Life cycle assessment (LCA) model is established to consider the system processes from cradle to end of construction. The comparison is conducted based on eight scenarios at four levels, i.e. cubic meter concrete, precast facade, group of façade elements, and an apartment. It is found that the carbon emission of the studied residential apartment is 669 kg carbon dioxide equivalent per one square meter floor area. Precasting can lead to 10% carbon reduction for one cubic meter concrete. Steel formwork for precasting performs better than timber formwork used in cast-in-situ concrete. Adopting more precast concrete can lead to less carbon emission. Based on the research findings, it is highly recommended to adopt precast concrete in building construction. The building industry should consider the carbon reduction as a benefit of implementing precast concrete.Department of Civil and Environmental Engineerin

ACS Style

Yahong Dong; Lara Celine Jaillon; Peggy Chu; Chi Sun Poon. Comparing carbon emissions of precast and cast-in-situ construction methods – A case study of high-rise private building. Construction and Building Materials 2015, 99, 39 -53.

AMA Style

Yahong Dong, Lara Celine Jaillon, Peggy Chu, Chi Sun Poon. Comparing carbon emissions of precast and cast-in-situ construction methods – A case study of high-rise private building. Construction and Building Materials. 2015; 99 ():39-53.

Chicago/Turabian Style

Yahong Dong; Lara Celine Jaillon; Peggy Chu; Chi Sun Poon. 2015. "Comparing carbon emissions of precast and cast-in-situ construction methods – A case study of high-rise private building." Construction and Building Materials 99, no. : 39-53.

Journal article
Published: 01 July 2015 in Building and Environment
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ACS Style

Yahong Dong; S. Thomas Ng. A life cycle assessment model for evaluating the environmental impacts of building construction in Hong Kong. Building and Environment 2015, 89, 183 -191.

AMA Style

Yahong Dong, S. Thomas Ng. A life cycle assessment model for evaluating the environmental impacts of building construction in Hong Kong. Building and Environment. 2015; 89 ():183-191.

Chicago/Turabian Style

Yahong Dong; S. Thomas Ng. 2015. "A life cycle assessment model for evaluating the environmental impacts of building construction in Hong Kong." Building and Environment 89, no. : 183-191.

Journal article
Published: 06 June 2015 in The International Journal of Life Cycle Assessment
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Social life cycle assessment (S-LCA) is a relatively new technique that is under rapid development. To further improve the reliability of S-LCA, more case studies and methodologies are of paramount importance. This study aims to develop a S-LCA model for building construction projects in Hong Kong, namely, the Social-impact Model of Construction (SMoC). In this paper, a social life cycle impact assessment (sLCIA) method is developed and a case study of a building construction project in Hong Kong is performed. The development of SMoC is composed of three stages. Stage one strives to establish the sLCIA method which includes the characterization, normalization and weighting. In stage two, a questionnaire survey is conducted to collect the weighting factors and to unveil the social impacts of on-site construction practices. Based on that, the SMoC model which consists of a set of functional worksheets is built. In stage three, a case study following the four-phase structure of S-LCA suggested by the UNEP/SETAC guidelines is conducted. Of the selected subcategories, local experts believed that health and safety (worker) is the most important social aspect. The questionnaire survey also suggests that the environmental-friendly on-site construction activities as identified in this research are beneficial to the society in general. However, adoption of precast concrete components can lead to negative impacts on fair salary and local employment, since the precast concrete is normally produced outside Hong Kong. The case study demonstrates that the studied project has positive social impacts in general, while the construction stage performs better than the material stage. The sensitivity analysis indicates that inclusion of environmental-friendly construction practices can significantly improve the social performance of the studied building construction project. The developed SMoC model and the case study should provide a comprehensive framework of S-LCA for building construction in Hong Kong. Despite being the first attempt of S-LCA in Hong Kong, the results help inform the local industry the social performance of their construction projects from a life cycle perspective.

ACS Style

Yahong Dong; S. Thomas Ng. A social life cycle assessment model for building construction in Hong Kong. The International Journal of Life Cycle Assessment 2015, 20, 1166 -1180.

AMA Style

Yahong Dong, S. Thomas Ng. A social life cycle assessment model for building construction in Hong Kong. The International Journal of Life Cycle Assessment. 2015; 20 (8):1166-1180.

Chicago/Turabian Style

Yahong Dong; S. Thomas Ng. 2015. "A social life cycle assessment model for building construction in Hong Kong." The International Journal of Life Cycle Assessment 20, no. 8: 1166-1180.

Dissertation
Published: 11 May 2015 in Life cycle sustainability assessment modeling of building construction
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ACS Style

Yahong Dong. Life cycle sustainability assessment modeling of building construction. Life cycle sustainability assessment modeling of building construction 2015, 1 .

AMA Style

Yahong Dong. Life cycle sustainability assessment modeling of building construction. Life cycle sustainability assessment modeling of building construction. 2015; ():1.

Chicago/Turabian Style

Yahong Dong. 2015. "Life cycle sustainability assessment modeling of building construction." Life cycle sustainability assessment modeling of building construction , no. : 1.

Journal article
Published: 01 January 2015 in Journal of Cleaner Production
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ACS Style

Yahong Dong; S. Thomas Ng; Albert H.K. Kwan; Siu Kei Wu. Substituting local data for overseas life cycle inventories – a case study of concrete products in Hong Kong. Journal of Cleaner Production 2015, 87, 414 -422.

AMA Style

Yahong Dong, S. Thomas Ng, Albert H.K. Kwan, Siu Kei Wu. Substituting local data for overseas life cycle inventories – a case study of concrete products in Hong Kong. Journal of Cleaner Production. 2015; 87 ():414-422.

Chicago/Turabian Style

Yahong Dong; S. Thomas Ng; Albert H.K. Kwan; Siu Kei Wu. 2015. "Substituting local data for overseas life cycle inventories – a case study of concrete products in Hong Kong." Journal of Cleaner Production 87, no. : 414-422.

Journal article
Published: 25 April 2014 in The International Journal of Life Cycle Assessment
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Life cycle assessment (LCA) has been increasingly implemented in analyzing the environmental performance of buildings and construction projects. To assess the life cycle environmental performance, decision-makers may adopt the two life cycle impact assessment (LCIA) approaches, namely the midpoint and endpoint models. Any imprudent usage of the two approaches may affect the assessment results and thus lead to misleading findings. ReCiPe, a well-known work, includes a package of LCIA methods to provide assessments on both midpoint and endpoint levels. This study compares different potential LCIA results using the midpoint and endpoint approaches of ReCiPe based on the assessment of a commercial building in Hong Kong. This paper examines 23 materials accounting for over 99 % of the environmental impacts of all the materials consumed in commercial buildings in Hong Kong. The midpoint and endpoint results are compared at the normalization level. A commercial building in Hong Kong is further studied to provide insights as a real case study. The ranking of impact categories and the contributions from various construction materials are examined for the commercial building. Influence due to the weighting factors is discussed. Normalization results of individual impact categories of the midpoint and endpoint approaches are consistent for the selected construction materials. The difference in the two approaches can be detected when several impact categories are considered. The ranking of materials is slightly different under the two approaches. The ranking of impact categories demonstrates completely different features. In the case study of a commercial building in Hong Kong, the contributions from subprocesses are different at the midpoint and endpoint. The weighting factors can determine not only the contributions of the damage categories to the total environment, but also the value of a single score. In this research, the midpoint and endpoint approaches are compared using ReCiPe. Information is whittled down from the inventories to a single score. Midpoint results are comprehensive while endpoint results are concise. The endpoint approach which provides additional information of damage should be used as a supplementary to the midpoint model. When endpoint results are asked for, a LCIA method like ReCiPe that provides both the midpoint and endpoint analysis is recommended. This study can assist LCA designers to interpret the midpoint and endpoint results, in particular, for the assessment of commercial buildings in Hong Kong.

ACS Style

Yahong Dong; S. Thomas Ng. Comparing the midpoint and endpoint approaches based on ReCiPe—a study of commercial buildings in Hong Kong. The International Journal of Life Cycle Assessment 2014, 19, 1409 -1423.

AMA Style

Yahong Dong, S. Thomas Ng. Comparing the midpoint and endpoint approaches based on ReCiPe—a study of commercial buildings in Hong Kong. The International Journal of Life Cycle Assessment. 2014; 19 (7):1409-1423.

Chicago/Turabian Style

Yahong Dong; S. Thomas Ng. 2014. "Comparing the midpoint and endpoint approaches based on ReCiPe—a study of commercial buildings in Hong Kong." The International Journal of Life Cycle Assessment 19, no. 7: 1409-1423.