The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Huanyu Wu - One of the best experts on this subject based on the ideXlab platform.
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A Framework for Quantifying Carbon Emissions Generated During Demolition Waste Processing
Proceedings of the 21st International Symposium on Advancement of Construction Management and Real Estate, 2017Co-Authors: Ying Li, Z. Z. Wu, Z. D. Li, Huabo Duan, Huanyu Wu, Jiayuan Wang, Xiaoling ZhangAbstract:Massive Demolition waste has been generated during urban renewal activities in China. Within the waste treatment and disposal procedures, tremendous carbon emissions have been generated due to energy consumption and exhaust emission from machines and vehicles operation. However, there is no attempt has been tried to quantify the carbon emission of Demolition waste processing. This paper proposes a framework for quantifying the carbon emission during Demolition waste treatment and disposal procedures. The results showed that the framework for quantifying carbon emissions from Demolition waste processing involves seven main stages: set the aims of study; build the model and decide the system boundary; identify the carbon emission factors; construct equations to quantifying the carbon emission factors (CEFs); obtain the data inventory for CEFs; calculate the carbon emissions and; output and analysis the results. From the generation to the final disposal, Demolition waste processing involves four main stages: generation, onsite treatment, transport and disposal. When using the quantification model, both direct and indirect carbon emission need to be considered. This paper provides a practical framework for scholars to quantify carbon emission from Demolition waste processing.
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Demolition waste generation and recycling potentials in a rapidly developing flagship megacity of south china prospective scenarios and implications
Construction and Building Materials, 2016Co-Authors: Huanyu Wu, Huabo Duan, Jiayuan Wang, Lina Zheng, Guomin ZhangAbstract:Abstract China’s construction industry is huge and widespread. Massive construction, particularly the large-scale urban renewable activities in megacities, inevitably causes billions of tons of construction and Demolition waste, and arouses great environmental concerns, which have not been well documented. The need for accurate data and informed analyses and further policy making are therefore paramount. Case studies of a rapidly developing flagship megacity, Shenzhen city in South China, in-depth surveys on construction and Demolition sites, recyclers and government department shave been conducted to obtain fundamental information about Demolition waste from its generation to disposal. Next, advanced methods to estimate and extrapolate the generation, flows and utilization options of Demolition waste have been created. Results show that approximately 14 million tons of Demolition waste has been produced in Shenzhen city annually from 2010 to 2015 and will trend upward in near future. The recycling potential based on current utilization options is valued at around 1.02 billion USD in 2015 and this number could soar to 1.38 billion USD if recycling rates are maximized. To summarize, the findings of this study provide quantitative documentation for generators, recyclers and the government to take responsibility for sound management of Demolition waste, including waste collection, transportation, utilization options and landfill planning. This approach could give insight into the quantification of Demolition waste if applied to other megacities and across China.
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An Investigation of Demolition Waste Management: Case of Shenzhen in China
Proceedings of the 20th International Symposium on Advancement of Construction Management and Real Estate, 2016Co-Authors: Huanyu Wu, Jiayuan Wang, Hongping Yuan, Lei Ouyang, Zhengdao LiAbstract:A huge amount of Demolition waste was produced during the Chinese urban renewal process. How to promote the material recycling rate and therefore to reduce the environmental impacts has been a significant challenge. However, there is a lack of research revealing the flows and key procedures of Demolition waste management. To fill the research gap, this study conducted in-depth interviews with 15 on-site managers involved in Demolition projects in Shenzhen of China. As a result, the flows, key management processes and measures have been obtained. Particularly, the key procedures and waste management measures have been identified with a Process Mapping Approach (PMA). The results show that main stakeholders in Demolition waste management chain include general contractors, professional Demolition companies, transport companies, recycling plants, landfill officers, government departments and scavengers. Illegal dumping and low marketing acceptation of recycling products are two major barriers of Demolition waste management. This study forms a concrete base for future studies aiming at optimizing the Demolition waste management process.
Anne Power - One of the best experts on this subject based on the ideXlab platform.
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housing and sustainability Demolition or refurbishment
Proceedings of the Institution of Civil Engineers - Urban Design and Planning, 2010Co-Authors: Anne PowerAbstract:The Demolition or refurbishment of older housing has been an active policy area since the late 1880s in the UK, when the government first authorised the statutory Demolition of unsanitary slums. The debate on Demolition and new building has been intensified since 2003, with government proposals for large-scale clearance and new construction. This paper summarises the evidence and debate on whether Demolition would reduce greenhouse gas emissions from buildings. It examines whether a more achievable and socially beneficial route to reducing energy use in the built environment exists, based on the fact that buildings account for half of the UK's carbon emissions. This paper argues that large-scale and accelerated Demolition would neither help with meeting energy and climate change targets, nor would it address social needs. Refurbishment offers clear advantages in time, cost, community impact, prevention of building sprawl, reuse of existing infrastructure and protection of existing communities. It can also...
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does Demolition or refurbishment of old and inefficient homes help to increase our environmental social and economic viability
Energy Policy, 2008Co-Authors: Anne PowerAbstract:The issue of whether to demolish or refurbish older housing has been debated for over a century. It has been an active policy area since the late 1880s, when the Government first authorised the statutory Demolition of insanitary slums. In the 1960s, revulsion at the scale of 'Demolition blight' and new building caused a rethink, leading to a major reinvestment in inner city neighbourhoods of older housing. In the past 5 years, debate on Demolition and new building has been intensified by the Government's Sustainable Communities Plan of 2003, with its proposals for large-scale clearance and building. Environmental arguments about renovating the existing stock have gained increasing prominence as people have sought to defend their communities from Demolition. The evidence on whether Demolition would reduce the amount of greenhouse gases we emit into the atmosphere is unclear and disputed. This paper summarises the evidence and arguments, and attempts to clarify the most realistic, achievable route to major reductions in energy use in homes. The arguments that apply to housing also apply to most other buildings and therefore to the overall built environment, which accounts for half of all carbon emissions. Three main sources of evidence have helped in the development of this paper, but there are many other studies we draw on in the discussion. Firstly, the Environmental Change Institute at Oxford University has argued that around three million Demolitions are necessary by 2050 if we are to reach the stringent energy reduction targets that will be required in our housing stock [Boardman et al., 2005. 40% House. Environmental Change Institute, Oxford]. Its Demolition figure is based on complex modelling that with small modifications can produce very different numbers. Its assessment does not take account of the embodied carbon costs such as volume of new materials, energy use in producing concrete, steel and other structural and infrastructural elements, and other factors affecting the environment such as land use, infrastructure and area blighting. We discuss these issues in order to clarify the scale of the challenge and the relative value of Demolition or renovation. Secondly, the Sustainable Development Commission [SDC, 2006. 'Stock Take': Delivering improvements in existing housing. Sustainable Development Commission, London] argues the urgent need to upgrade the existing stock on the grounds that 70% of all homes that will exist in 2050, even with the ambitious new building programme now announced, are already built. The maximum feasible Demolition of two million existing homes by 2050, based on experience to date, suggests that under 10% of the current stock will have been demolished by then. We argue that upgrading this stock to high environmental standards can actually be achieved more cheaply than demolishing it, and with as significant a carbon reduction. Thirdly, the German Federal Housing, Urban and Transport Ministry has announced an ambitious energy reduction programme that will upgrade all pre-1984 homes in Germany by 2020, an estimated 30 million units.1 This is based on evidence from several CO2 reduction programmes since 1996, showing the feasibility of upgrading. An 80% cut in energy use has been achieved, making the performance of the renovated homes at least as good as Germany's current exacting new build standards. The evidence from Germany is more grounded than any that has so far been produced in the UK, as it is based on several thousand examples. The paper also discusses the social and political problems of Demolition. There is widespread opposition to large-scale Demolition of older stock, mainly pre-1919 terraced homes, which is currently the most 'leaky'. This older property is a prime target for Demolition in the Environmental Change Institute's proposals and the Government's plans. The environmental benefits of refurbishment are shown, based on work by the Empty Homes Agency, evidence from English Heritage, the Building Research Establishment and the Prince's Foundation. Work on refurbishment shows that existing homes, often in brick-built terraces, are relatively easy to upgrade and, with careful reinvestment in the existing buildings, can achieve as high environmental efficiency standards as current new build. We consider major social, economic and environmental benefits of refurbishment compared with Demolition, including: a reduction in the transport costs, reduced landfill disposal, greater reuse of materials, reuse of infill sites and existing infrastructure, reduced new building on flood plains, local economic development, retention of community infrastructure, neighbourhood renewal and management. We weigh these benefits against the full costs of Demolition and rebuilding, involving much higher capital costs, higher material wastage, greater embodied carbon inputs, the polluting impact of particulates, greater use of lorry transport for materials and waste, greater use of aggregates, more noise and disruption. On the social issues of housing need and fuel poverty, we argue that refurbishment and infill building are socially more acceptable, cheaper and create far lower environmental impact, while reducing fuel poverty. The incentive problems associated with renovation and the barriers to delivering it are also discussed. The evidence we have uncovered counters the suggestion that large-scale and accelerated Demolition would either help us meet our energy and climate change targets or respond to our social needs. Many arguments remain unclear, but the overall balance of evidence suggests that refurbishment most often makes sense on the basis of time, cost, community impact, prevention of sprawl, reuse of existing infrastructure and protection of existing communities. It can also lead to reduced energy use in buildings in both the short and long term. Many factors will influence what happens in practice, but it seems unlikely under any scenario that the rate of Demolition will accelerate far above current levels. Upgrading the existing stock is likely to gain in significance for environmental, social and economic reasons. Adopting policies that aid the retention and upgrading of the existing stock will help develop the necessary skills and technologies, save materials and land, and enhance the integration of existing communities in need of regeneration.
Weisheng Lu - One of the best experts on this subject based on the ideXlab platform.
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Identifying factors influencing Demolition waste generation in Hong Kong
Journal of Cleaner Production, 2017Co-Authors: Xi Chen, Weisheng LuAbstract:Among all construction activities, Demolition normally generates the largest proportion of construction and Demolition (C&D) waste, to which requires more importance being attached for effective management. Previous studies have attempted to understand Demolition waste generation (DWG) but the understanding remains relatively insufficient, largely due to the erratic and poor quality data available. This research aims to identify factors impacting DWG by making use of a big dataset which has recently become available as a result of C&D waste management practices in Hong Kong. Using big data analytics, it is confirmed that DWG, Demolition cost, and duration of conducting the Demolition work are dependent on each other. It is also found that geographical location, building usage, and the public-private nature of a building project also have a significant impact on DWG in the Hong Kong context. Based on the correlations between DWG and these identified factors, stakeholders may introduce proper managerial or policy interventions to effectively minimize DWG. For example, public policy-makers may formulate more tailor-made regulations to attach more importance to the locations, usages and public-private nature, which have more potentials for Demolition waste minimization.
Raffaele Cioffi - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties and durability of mortar containing fine fraction of Demolition wastes produced by selective Demolition in south italy
Composites Part B-engineering, 2017Co-Authors: Francesco Colangelo, Raffaele CioffiAbstract:Abstract Recycling of construction and Demolition waste (CDW) has to be encouraged. Structural concrete and mortar is one of the possible applications, but requires a good quality of the aggregates to be used.The use of wastes treated by mobile plants in the above application is possible only if an accurate selective Demolition is conducted. The goal of this study is to produce self-levelling mortars containing high amount of CDW fine fractions that are problematic waste materials. This research investigate the physical and mechanical characteristics of different kind of CDW obtained from selective and traditional Demolition techniques. Comparison between the properties of the mixtures obtained from different kind of aggregates offers the possibility to understand the advantages in using selective Demolition. The results show that the use of superplasticizer, combined with selective Demolition, can improve significantly the mechanical properties of mortars produced with CDW aggregate. In particular aggregate coming from bricks can improve mechanical strength, probably because of their pozzolanic effect.
Jiayuan Wang - One of the best experts on this subject based on the ideXlab platform.
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A Framework for Quantifying Carbon Emissions Generated During Demolition Waste Processing
Proceedings of the 21st International Symposium on Advancement of Construction Management and Real Estate, 2017Co-Authors: Ying Li, Z. Z. Wu, Z. D. Li, Huabo Duan, Huanyu Wu, Jiayuan Wang, Xiaoling ZhangAbstract:Massive Demolition waste has been generated during urban renewal activities in China. Within the waste treatment and disposal procedures, tremendous carbon emissions have been generated due to energy consumption and exhaust emission from machines and vehicles operation. However, there is no attempt has been tried to quantify the carbon emission of Demolition waste processing. This paper proposes a framework for quantifying the carbon emission during Demolition waste treatment and disposal procedures. The results showed that the framework for quantifying carbon emissions from Demolition waste processing involves seven main stages: set the aims of study; build the model and decide the system boundary; identify the carbon emission factors; construct equations to quantifying the carbon emission factors (CEFs); obtain the data inventory for CEFs; calculate the carbon emissions and; output and analysis the results. From the generation to the final disposal, Demolition waste processing involves four main stages: generation, onsite treatment, transport and disposal. When using the quantification model, both direct and indirect carbon emission need to be considered. This paper provides a practical framework for scholars to quantify carbon emission from Demolition waste processing.
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Demolition waste generation and recycling potentials in a rapidly developing flagship megacity of south china prospective scenarios and implications
Construction and Building Materials, 2016Co-Authors: Huanyu Wu, Huabo Duan, Jiayuan Wang, Lina Zheng, Guomin ZhangAbstract:Abstract China’s construction industry is huge and widespread. Massive construction, particularly the large-scale urban renewable activities in megacities, inevitably causes billions of tons of construction and Demolition waste, and arouses great environmental concerns, which have not been well documented. The need for accurate data and informed analyses and further policy making are therefore paramount. Case studies of a rapidly developing flagship megacity, Shenzhen city in South China, in-depth surveys on construction and Demolition sites, recyclers and government department shave been conducted to obtain fundamental information about Demolition waste from its generation to disposal. Next, advanced methods to estimate and extrapolate the generation, flows and utilization options of Demolition waste have been created. Results show that approximately 14 million tons of Demolition waste has been produced in Shenzhen city annually from 2010 to 2015 and will trend upward in near future. The recycling potential based on current utilization options is valued at around 1.02 billion USD in 2015 and this number could soar to 1.38 billion USD if recycling rates are maximized. To summarize, the findings of this study provide quantitative documentation for generators, recyclers and the government to take responsibility for sound management of Demolition waste, including waste collection, transportation, utilization options and landfill planning. This approach could give insight into the quantification of Demolition waste if applied to other megacities and across China.
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An Investigation of Demolition Waste Management: Case of Shenzhen in China
Proceedings of the 20th International Symposium on Advancement of Construction Management and Real Estate, 2016Co-Authors: Huanyu Wu, Jiayuan Wang, Hongping Yuan, Lei Ouyang, Zhengdao LiAbstract:A huge amount of Demolition waste was produced during the Chinese urban renewal process. How to promote the material recycling rate and therefore to reduce the environmental impacts has been a significant challenge. However, there is a lack of research revealing the flows and key procedures of Demolition waste management. To fill the research gap, this study conducted in-depth interviews with 15 on-site managers involved in Demolition projects in Shenzhen of China. As a result, the flows, key management processes and measures have been obtained. Particularly, the key procedures and waste management measures have been identified with a Process Mapping Approach (PMA). The results show that main stakeholders in Demolition waste management chain include general contractors, professional Demolition companies, transport companies, recycling plants, landfill officers, government departments and scavengers. Illegal dumping and low marketing acceptation of recycling products are two major barriers of Demolition waste management. This study forms a concrete base for future studies aiming at optimizing the Demolition waste management process.
