scholarly journals Bridge Carbon Emissions and Driving Factors Based on a Life-Cycle Assessment Case Study: Cable-Stayed Bridge over Hun He River in Liaoning, China

Author(s):  
ZhiWu Zhou ◽  
Julián Alcalá ◽  
Víctor Yepes

Due to the rapid growth of the construction industry’s global environmental impact, especially the environmental impact contribution of bridge structures, it is necessary to study the detailed environmental impact of bridges at each stage of the full life cycle, which can provide optimal data support for sustainable development analysis. In this work, the environmental impact case of a three-tower cable-stayed bridge was analyzed through openLCA software, and more than 23,680 groups of data were analyzed using Markov chain and other research methods. It was concluded that the cable-stayed bridge contributed the most to the global warming potential value, which was mainly concentrated in the operation and maintenance phases. The conclusion shows that controlling the exhaust pollution of passing vehicles and improving the durability of building materials were the key to reducing carbon contribution and are also important directions for future research.

2021 ◽  
Vol 13 (14) ◽  
pp. 7990
Author(s):  
Suman Paneru ◽  
Forough Foroutan Jahromi ◽  
Mohsen Hatami ◽  
Wilfred Roudebush ◽  
Idris Jeelani

Traditional energy analysis in Building Information Modeling (BIM) only accounts for the energy requirements of building operations during a portion of the occupancy phase of the building’s life cycle and as such is unable to quantify the true impact of buildings on the environment. Specifically, the typical energy analysis in BIM does not account for the energy associated with resource formation, recycling, and demolition. Therefore, a comprehensive method is required to analyze the true environmental impact of buildings. Emergy analysis can offer a holistic approach to account for the environmental cost of activities involved in building construction and operation in all its life cycle phases from resource formation to demolition. As such, the integration of emergy analysis with BIM can result in the development of a holistic sustainability performance tool. Therefore, this study aimed at developing a comprehensive framework for the integration of emergy analysis with existing Building Information Modeling tools. The proposed framework was validated using a case study involving a test building element of 8’ × 8’ composite wall. The case study demonstrated the successful integration of emergy analysis with Revit®2021 using the inbuilt features of Revit and external tools such as MS Excel. The framework developed in this study will help in accurately determining the environmental cost of the buildings, which will help in selecting environment-friendly building materials and systems. In addition, the integration of emergy into BIM will allow a comparison of various built environment alternatives enabling designers to make sustainable decisions during the design phase.


2020 ◽  
Vol 12 (24) ◽  
pp. 10686
Author(s):  
Mona Abouhamad ◽  
Metwally Abu-Hamd

The objective of this paper is to apply the life cycle assessment methodology to assess the environmental impacts of light steel framed buildings fabricated from cold formed steel (CFS) sections. The assessment covers all phases over the life span of the building from material production, construction, use, and the end of building life, in addition to loads and benefits from reuse/recycling after building disposal. The life cycle inventory and environmental impact indicators are estimated using the Athena Impact Estimator for Buildings. The input data related to the building materials used are extracted from a building information model of the building while the operating energy in the use phase is calculated using an energy simulation software. The Athena Impact Estimator calculates the following mid-point environmental measures: global warming potential (GWP), acidification potential, human health potential, ozone depletion potential, smog potential, eutrophication potential, primary and non-renewable energy (PE) consumption, and fossil fuel consumption. The LCA assessment was applied to a case study of a university building. Results of the case study related to GWP and PE were as follows. The building foundations were responsible for 29% of the embodied GWP and 20% of the embodied PE, while the CFS skeleton was responsible for 30% of the embodied GWP and 49% of the embodied PE. The production stage was responsible for 90% of the embodied GWP and embodied PE. When benefits associated with recycling/reuse were included in the analysis according to Module D of EN 15978, the embodied GWP was reduced by 15.4% while the embodied PE was reduced by 6.22%. Compared with conventional construction systems, the CFS framing systems had much lower embodied GWP and PE.


Author(s):  
Xun Li ◽  
Pablo Ortiz ◽  
Brandon Kuczenski ◽  
Diana Franklin ◽  
Frederic T. Chong

The rapid growth of information technology has not only brought substantial economic and societal benefit but also led to an unsustainable disposable model in which mobile devices are replaced in a matter of months. The environmental impact of this stream of handsets in terms of manufacturing energy, materials, and disposal costs is alarming. This chapter aims at raising today’s environmental issues of the increasing smartphone market, as well as providing a quantitative analysis on the environmental impact of different life-cycle stages of the smartphones, including the manufacturing stage, using stage, and recycling. To achieve sustainable computing and best utilize the energy consumed during manufacturing the large number of devices, this chapter demonstrates the methodology and techniques towards reusing smartphones by presenting a case study on reusing smartphones for elementary school education.


2020 ◽  
Vol 12 (14) ◽  
pp. 5666 ◽  
Author(s):  
Girts Bumanis ◽  
Laura Vitola ◽  
Ina Pundiene ◽  
Maris Sinka ◽  
Diana Bajare

To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited application. Therefore, this review article discusses alternatives to lime-hemp concrete that would achieve similar thermal properties with an equivalent or lower environmental impact. Binders such as gypsum, geopolymers, and starch are proposed as alternatives, due to their performance and low environmental impact, and available research is summarized and discussed in this paper. The summarized results show that low-density thermal insulation bio-composites with a density of 200–400 kg/m3 and thermal conductivity (λ) of 0.06–0.09 W/(m × K) can be obtained with gypsum and geopolymer binders. However, by using a starch binder it is possible to produce ecological building materials with a density of approximately 100 kg/m3 and thermal conductivity (λ) as low as 0.04 W/(m × K). In addition, a preliminary life cycle assessment was carried out to evaluate the environmental impact of reviewed bio-composites. The results indicate that such bio-composites have a low environmental impact, similar to lime-hemp concrete.


Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1905 ◽  
Author(s):  
Ming Hu

Knowledge and research tying the environmental impact and embodied energy together is a largely unexplored area in the building industry. The aim of this study is to investigate the practicality of using the ratio between embodied energy and embodied carbon to measure the building’s impact. This study is based on life-cycle assessment and proposes a new measure: life-cycle embodied performance (LCEP), in order to evaluate building performance. In this project, eight buildings located in the same climate zone with similar construction types are studied to test the proposed method. For each case, the embodied energy intensities and embodied carbon coefficients are calculated, and four environmental impact categories are quantified. The following observations can be drawn from the findings: (a) the ozone depletion potential could be used as an indicator to predict the value of LCEP; (b) the use of embodied energy and embodied carbon independently from each other could lead to incomplete assessments; and (c) the exterior wall system is a common significant factor influencing embodied energy and embodied carbon. The results lead to several conclusions: firstly, the proposed LCEP ratio, between embodied energy and embodied carbon, can serve as a genuine indicator of embodied performance. Secondly, environmental impact categories are not dependent on embodied energy, nor embodied carbon. Rather, they are proportional to LCEP. Lastly, among the different building materials studied, metal and concrete express the highest contribution towards embodied energy and embodied carbon.


2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anna Wojewnik-Filipkowska ◽  
Anna Dziadkiewicz ◽  
Wioleta Dryl ◽  
Tomasz Dryl ◽  
Robert Bęben

Purpose Public involvement is essential in the creation of effective local strategies for the development of a sustainable built environment, yet there has been little research on stakeholder motivation and engagement in the creation of infrastructure-project value, in the entire life cycle of a given project, while different markets show that overlooking stakeholders can negatively affect the success of an infrastructure project. The purpose of this paper is to fill the theory-practice gap that has been discerned, and thus study how early public involvement determines the success of an infrastructure project, which is identified with its value creation (effectiveness, sustainability and utility). Design/methodology/approach This research entails a combination of methods. A case study analysis allowed observation of the role the stakeholders play and of how the relationships, perspectives, expectations and risks, along with other soft issues, continue to affect projects. The case study required comprehensive examination of project documentation and conduction of interviews. To collect data, focused group interviews and semi-structured interviews were used, supported with direct questionnaire surveys. Findings The study provides evidence that early public engagement can contribute to infrastructure-project value (effectiveness, sustainability and utility). Practically speaking, the stakeholder analysis performed allowed proposal of a general stakeholder analysis framework for infrastructure projects. It can be implemented at each investment phase of the project life cycle, since stakeholders and their motivation may develop and/or change over time, which necessitates development of proper managerial strategies. The findings highlight the opportunities and the challenges faced by stakeholder management. Research limitations/implications The limitation of this study derives from the fact that the sample size was small, which was necessary for an in-depth qualitative research and application of the case study method. The observations were made on a selected case study, within a limited period of time, thus the context of the analysis as well as the stakeholder perception was subject to possible change. The research limitations concern the provisional nature of the information obtained, the cross-sectional nature of the analysis itself, and, finally, the inability to predict all future events. Ultimately, stakeholder mapping was performed for the operational phase of the investment exclusively, while the analysis was limited to identification and classification of the stakeholders, including their relationship with the project. Practical implications The research conclusions provide useful input for future research on development of effective strategies for management of the shareholders that are related to a given infrastructure project, in order to achieve project success. Simultaneously, from a property perspective, the research has contributed to a better understanding of the importance of infrastructure, on the part of real estate stakeholders. Social implications Application of the approach proposed in the study may contribute to early development and implementation of appropriate trust-building processes. The building of relationships between stakeholders enables checks and balances, promotes short- and long-term project benefits, and increases the value of a project. Originality/value The novelty of the research consists in the connection, as part of infrastructure projects, of the theory of consumption values and the concept of an investment cycle with the framework of stakeholder analysis.


2017 ◽  
Vol 17 (4) ◽  
pp. 9-27 ◽  
Author(s):  
Rebecca L. Gruby

This article examines regional environmental governance (REG) through the lens of human geography theory on scale. Drawing on a case study of the Micronesia Challenge, a regional conservation commitment among five Pacific islands, I advance a critical theory of REG as a scaling process and tool of politics through which regions are (re)made and mobilized in support of diverse agendas. Results highlight understudied dimensions of REG, including: motivations for scaling environmental governance to regions; the co-production of regional and global environmental governance; the mutable expression of regionality within REG; and the ways in which REG is leveraged for resource mobilization, global visibility and influence, and conservation. The potential for REG to empower subaltern groups while advancing conservation is promising, and an important area for future research. The overall contribution of this article is a more complex, politicized understanding of REG that complicates a scholarly search for its inherent characteristics.


2018 ◽  
Vol 10 (6) ◽  
pp. 1810 ◽  
Author(s):  
Weiguo Fan ◽  
Peng Zhang ◽  
Zihan Xu ◽  
Hejie Wei ◽  
Nachuan Lu ◽  
...  

2020 ◽  
Vol 993 ◽  
pp. 1473-1480
Author(s):  
Yan Jiao Zhang ◽  
Li Ping Ma ◽  
Shi Wei Ren ◽  
Meng Chi Huang ◽  
Ying Wang ◽  
...  

With the emphasis of national policies on green manufacturing and the recognition of the people for green development, expanding the green assessment of products will be the general trend. In this study the life cycle assessment method was used to compile a list of resources, energy consumption and pollutant emissions during the life cycle of typical ordinary gypsum plasterboard and functional phase-change gypsum plasterboard, the key environmental impact indicators of both products during the life cycle calculated, the key stages affecting the environmental performance of products analyzed and identified, and the difference in environmental impacts between phase-change gypsum plasterboard and ordinary gypsum plasterboard compared and analyzed, for guiding the selection of green building materials and the development of ecological building materials. The results show that the global warming potential of phase-change gypsum plasterboard is 3.42 kgCO2 equivalent/m2, the non-renewable resource depletion potential is 2.25×10-5 kgSb equivalent/m2, the respiratory inorganic is 1.97×10-3 kgPM2.5 equivalent/m2, the eutrophication is 1.21×10-3 kgPO43- equivalent/m2, and the acidification is 9.47×10-3 kgSO2 equivalent/m2. Compared with ordinary gypsum plasterboard, the phase-change gypsum plasterboard shows the biggest increase by 874.03% in non-renewable resource depletion potential. The major environmental impact of ordinary gypsum plasterboard in the life cycle is mainly from energy use, and the transport process is the main stage of eutrophication. The use of phase-change materials in the phase-change gypsum plasterboard is the main stage causing environmental impact.


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