scholarly journals Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces

2020 ◽  
Vol 12 (3) ◽  
pp. 975 ◽  
Author(s):  
Soo-yeon Seo ◽  
Byunghee Lee ◽  
Jongsung Won
Keyword(s):  
Economic Impacts ◽  
Construction And Demolition Waste ◽  
Existing Buildings ◽  
Top Down ◽  
Construction Costs ◽  
Demolition Waste ◽  
Existing Building ◽  
Vertical Extension ◽  
Unit Costs ◽  
Construction Techniques

Without demolishing an entire existing building, it is possible to sustainably expand its underground spaces to enhance the building’s functionality. However, there have been a few relevant studies exploring this option, and they did not consider the financial feasibilities of underground vertical extension methods. Therefore, this paper analyzes the economic impacts of three sustainable vertical extension methods for existing underground spaces. The extension methods were the (1) bottom-up, (2) normal top-down, and (3) top-down with multi-post downward (MPD) methods. In order to analyze and compare the economic impacts of the underground vertical extension methods, 24 illustrative examples were generated in this paper. Construction costs of the three sustainable vertical extension methods for existing underground spaces are calculated and compared. Those are based on the quantity of used materials in the construction phase and dismantled materials in the demolition phase, as well as unit costs of each material. In addition, the structural stabilities of the examples are analyzed using MIDAS Gen 2017. As the results, the top-down method with MPD was the lowest sustainable method for vertically expanding underground spaces compared to other two methods under the same condition. Moreover, the higher the number of underground floors of existing buildings and the greater the number of extended basement floors, the more economically advantageous was the top-down method with MPD. Considering their structural stabilities and economic impacts of the extension methods help practitioners to select appropriate construction techniques and reduce costs, risks, and the amount of generated construction and demolition waste.

scholarly journals Constructability Analyses of Vertical Extension Methods for Existing Underground Spaces

2021 ◽  
Vol 13 (7) ◽  
pp. 3647
Author(s):  
Soo-Yeon Seo ◽  
Byunghee Lee ◽  
Jongsung Won
Keyword(s):  
Existing Buildings ◽  
Underground Structures ◽  
Top Down ◽  
Construction Costs ◽  
Existing Building ◽  
Future Studies ◽  
Construction Scheduling ◽  
Vertical Extension ◽  
Analysis Process ◽  
Cost Constraints

Remodeling underground structures requires careful construction planning, including consideration of costs and scheduling. Therefore, this study aims to analyze and compare the effects of four methods for vertically extending the underground spaces of an existing building under scheduling and cost constraints. The study considers the following extension methods: (1) bottom-up method, (2) normal top-down method after demolition, (3) normal top-down method in parallel with demolition, and (4) top-down method using double beams in parallel with demolition. Twelve illustrative examples are presented to investigate the constructability of these methods in terms of construction scheduling and costs. The construction durations and costs of each example is calculated and compared. We also analyze the structural stability of the examples using MIDAS Gen 2017. We conclude that the top-down method using double beams is the most efficient method in terms of costs and scheduling. The results and analysis process can help practitioners to select appropriate methods to expand underground spaces without demolishing entire existing buildings and efficiently manage costs and schedules. In future studies, these extension methods should be applied to real-world projects in various countries to validate and verify their actual effects on construction costs and scheduling.

scholarly journals Proposal for a Methodology for Sustainable Rehabilitation Strategies of the Existing Building Stock—The Ponte Gêa Neighborhood

Designs ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 26
Author(s):  
Michael M. Santos ◽  
João C. G. Lanzinha ◽  
Ana Vaz Ferreira
Keyword(s):  
Urban Space ◽  
Construction And Demolition Waste ◽  
Expected Improvement ◽  
Water Efficiency ◽  
Building Stock ◽  
Demolition Waste ◽  
Existing Building ◽  
Agenda 2030 ◽  
Development Agenda ◽  
The City

Having in mind the objectives of the United Nations Development Agenda 2030, which refers to the sustainable principles of a circular economy, it is urgent to improve the performance of the built environment. The existing buildings must be preserved and improved in order to reduce their environmental impact, in line with the need to revert climate change and reduce the occurrence of natural disasters. This work had as its main goal to identify and define a methodology for promoting the rehabilitation of buildings in the Ponte Gêa neighborhood, in the city of Beira, Mozambique, with an emphasis on energy efficiency, water efficiency, and construction and demolition waste management. The proposed methodology aims to create a decision support method for creating strategic measures to be implemented by considering the three specific domains—energy, water, and waste. This model allows for analyzing the expected improvement according to the action to be performed, exploring both individual and community solutions. It encompasses systems of standard supply that can reveal greater efficiency and profitability. Thus, the in-depth knowledge of the characteristics of urban space and buildings allows for establishing guidelines for the renovation process of the neighborhood.

scholarly journals CONSTRUCTION AND DEMOLITION WASTE ILLEGAL DUMPING: ENVIRONMENTAL, SOCIAL AND ECONOMIC IMPACTS ASSESSMENT FOR A GROWING CITY

2021 ◽  
Vol 9 (4) ◽  
pp. 148-155
Author(s):  
Ngoc Cham Luu ◽  
Lan Huong Nguyen ◽  
Thi Viet Nga Tran ◽  
Yugo Isobe ◽  
Mikio Kawasaki ◽  
...  
Keyword(s):  
Economic Impacts ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Illegal Dumping

Clean construction and demolition waste material cycles through optimised pre-demolition waste audit documentation: A review on building material assessment tools

2020 ◽  
Vol 38 (9) ◽  
pp. 923-941
Author(s):  
Melanie Rašković ◽  
Arne M Ragossnig ◽  
Krzysztof Kondracki ◽  
Michaela Ragossnig-Angst
Keyword(s):  
Waste Management ◽  
Building Material ◽  
Holistic Approach ◽  
Assessment Tools ◽  
Construction And Demolition Waste ◽  
Waste Stream ◽  
Building Stock ◽  
Demolition Waste ◽  
Urban Mining ◽  
Existing Building

Waste from the construction sector poses huge challenges for sustainable waste management. This is not only due to the vast amount of waste produced in construction and demolition activities, but also due to pollutants potentially contained in these products. Subject to these conditions, waste management must ensure recovery of as many resources as possible, while making sure to keep material loops clean. This demanding task requires more knowledge about the existing building stock and an adaptation of current demolition processes. Innovative technologies, such as Building Information Modelling, or modern frameworks, such as Geographic Information Systems, offer a high potential to synoptically provide stock material information for future demolition activities for individual objects to be deconstructed as well as for whole cities as a basis for managing the anthropogenic stock and potential urban mining. Suitable methods of data collection allow for acquiring the desired input for the generation of building stock models enriched with demolition-related information. With the latter, selective deconstruction strategies as well as appropriate waste stream routing agendas can be planned and executed, thereby securing safety at work during the demolition process itself and a waste stream routing according to the waste hierarchy. This review article gives an overview of currently deployed building material assessment tools (data capture and visualisation), both a prerequisite for improved information on materials and geometry (and thereby mass/volume). In addition, this article describes workflows employable for the purpose of urban mining in end-of-life buildings, of which one holistic approach will be described in depth.

scholarly journals Development of New Eco-Efficient Cement-Based Construction Materials and Recycled Fine Aggregates and EPS from CDW

2017 ◽  
Vol 11 (1) ◽  
pp. 381-394 ◽  
Author(s):  
Pilar Mercader-Moyano ◽  
Maria Victoria Requena García-de-la-Cruz ◽  
Marta Edith Yajnes
Keyword(s):  
Waste Management ◽  
Water Absorption ◽  
Research Work ◽  
Construction Materials ◽  
Construction And Demolition Waste ◽  
Construction Costs ◽  
Demolition Waste ◽  
Improve Energy Efficiency ◽  
Efficient Construction ◽  
Construction Product

Background: This research paper presents the results of the characterization and adaptation of the construction product developed by the Experimental Centre of Production of the Faculty of Architecture, Design and Urbanism of the University of Buenos Aires, Argentina (CEP FADU UBA) for Spanish regulations. Additionally, it shows the study of the industrialization of its manufacturing process in Spain. The product consists of a cement-based compound that includes recycled fine ceramic aggregates and EPS from rehabilitation works. Objectives: The aim of this research work is to propose a new eco-efficient construction product adapted to Spanish and European regulations in order to minimize the environmental impact of the construction activity, improve energy efficiency and reduce construction costs. Furthermore, it is presented as a solution to the problem that construction and demolition waste management represents. Method and Results: Samples have been tested to the water absorption and compression resistance tests according to UNE standards. These parameters serve to delimit its use in new sustainable constructive solutions for the design of zero energy consumption buildings (nZEB). Conclusion: Results show that it is possible to obtain certain samples that include recycled ceramic aggregates and EPS which present good response to the mechanical and water absorption tests. In addition, it is obtained that industrializing this product in Spain is complex due to the current waste management system.

STRAW IN THE RETROFITTING EXISTING BUILDINGS: SURVEYS AND PROSPECTS

Rivista Tema ◽  
2021 ◽  
Vol 7 (N.2 (2021)) ◽  
Author(s):  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Existing Buildings ◽  
International Debate ◽  
Existing Building ◽  
Construction Techniques ◽  
Traditional Construction ◽  
Architecture And Design ◽  
Initial Research

The article aims to investigate the feasibility of straw as an alternative to traditional construction materials, with particular reference to the retrofit of buildings. This paper is part of the international debate on environmental sustainability, energy efficiency, and rehabilitation of the existing building heritage and reports the results of research carried out at the Department of Architecture and Design of the Politecnico di Torino. After initial research and classification of the main construction techniques that can be used to realize straw thermal coats, a survey was started to collect opinions on the use of straw in construction from professionals and potential users. At the same time, one on-site measurement campaign was carried out to assess the thermal transmittance of the straw insulation coat. The different investigations – literature research, surveys, experimentation – highlighted the strengths and weaknesses of the use of straw and identified possible scenarios for its wider application in Italy.

scholarly journals Evaluation of the strength of concretes produced with recycled CDW aggregates originating from a housing project located in Pernambuco, Brazil

2021 ◽  
Vol 10 (5) ◽  
pp. e6610514583
Author(s):  
Renan Gustavo Pacheco Soares ◽  
Gustavo Gutierrez de Oliveira Rodrigues ◽  
Emylle Kerolayne Palmeira de Andrade ◽  
Carla Renata Xavier Pacheco ◽  
Lyneker Souza de Moura ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Urban Areas ◽  
Good Alternative ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Demolition Waste ◽  
Coarse Aggregates ◽  
Construction Techniques ◽  
Three Samples ◽  
Hardened State

In view of the improvement of construction techniques and technological innovations, civil construction still faces numerous problems. Uncontrolled exploitation of natural resources has caused major environmental impacts, in addition to the generation and accumulation of debris in urban areas. Thus, recycling appears as a sustainable alternative to reduce the accumulation of this waste. As an option, there is the use of Recycled Aggregates, obtained through Construction and Demolition Waste (CDW). In this sense, the present study aimed to analyze the feasibility of using the CDW through its application in the production of recycled coarse aggregates in concrete. For the tests, the coarse aggregate was replaced in the proportions of 0 (reference line), 10, 20, 30, 40, 50 and 100%, with three samples for each line and age. The dosage of the strokes followed the parameters established by the IPT / EPUSP method. The concretes were analyzed for compressive strength at 7, 14 and 28 days and the samples were evaluated for properties in an anhydrous, fresh and hardened state. The data collected in the tests were tabulated and analyzed for the degree of addition and its correlation with the characteristic resistance. The results allowed to conclude that the use of the residue in the form of aggregate for the concrete, in the proportions of 10% and 20%, does not affect the compressive strength, making it a good alternative.

Sound insulation of a hollow concrete blocks wall made with construction and demolition waste and wood-based panels as linings

2021 ◽  
pp. 1351010X2199364
Author(s):  
Rodrigo Scoczynski Ribeiro ◽  
Raylton Pereira de Sousa ◽  
Rosemara Santos Deniz Amarilla ◽  
Luis Henrique Sant’Ana ◽  
Márcio Avelar ◽  
...  
Keyword(s):  
Masonry Wall ◽  
Construction And Demolition Waste ◽  
Index Formula ◽  
Sound Insulation ◽  
Demolition Waste ◽  
Hygroscopic Properties ◽  
Construction Techniques ◽  
Concrete Blocks ◽  
Sound Reduction ◽  
Reduction Index

It is a well-discussed topic that Construction and Demolition Waste (CDW) can be recycled and used as aggregate in the construction sector. Generally, Brazilian construction techniques are based on hollow blocks or bricks and mortars as coating systems. This paper describes the sound insulation of a masonry wall built with hollow concrete blocks and CDW as aggregates. The measurements were performed according to the reverberant chamber method. Keeping sustainability in mind instead of applying cement mortar as coating system, Oriented Strand Boards (OSB) and Wood-Wool Cement Boards (WWCB) were used and also tested as acoustical linings. The panels were directly attached on the wall with nails in the receiving room. All types of panels increased the weighted sound reduction index ([Formula: see text]). Wood-based composites can also improve the air quality because of their hygroscopic properties. In summary, sustainable wall systems were characterized according to their sound insulation properties, presented as possible substitutes for traditional masonry walls.

scholarly journals Vertical Extension and Improving of Existing Buildings

2017 ◽  
Vol 11 (1) ◽  
pp. 83-94 ◽  
Author(s):  
Joan Artés ◽  
Gerardo Wadel ◽  
Núria Martí
Keyword(s):  
Low Density ◽  
Two Dimensional ◽  
Existing Buildings ◽  
Transport Time ◽  
Existing Building ◽  
Environmental Evaluation ◽  
Vertical Extension ◽  
Urban Models ◽  
First Results ◽  
Space Characteristic

Low-density urban models, widely diffused in Spain until 2008, have been strongly criticized because they produce a great strain on the land, high infrastructure costs, increasing maintenance expenses, energy waste and pollution from excessive transport, time wasted commuting and more bedroom communities. To counterbalance this effect, opponents are claiming for a review of the capacity that the conventional city, with its higher population density and mixed uses, may still possess. One possibility that has been explored is the vertical extension of buildings, which capitalizes on the remaining buildable space characteristic of many older buildings, and at the same time, refurbishes the housing block and improves standards of energy efficiency, safety and accessibility. The challenge is not only technical - it is clear what needs to be done and how to do it - but it is also social and fiscal; in other words, how do we get organized and how do we finance such a project? The preferred construction system for vertical extensions is industrialized and uses two main materials: steel and wood. The system involves the use of two-dimensional panels and 3D pods that, once completed in the factory, are transported to the worksite, lifted by a crane and installed on the roof of the building. From refurbishing the existing building to adding the new vertical extension, the entire operation takes four months. The experience of this vision and its application in the area of the Example in Barcelona, coming soon to other central neighborhoods in Spanish cities, allows us to present our first results: the detection of over 2,000 buildings with remaining buildable space, the need to vertically extend 50 buildings and our completed projects, in some cases already inhabited, of which half a dozen are currently undergoing environmental evaluation using our own tool.

A culture-based solution for construction and demolition waste management in Sri Lanka: a literature review

2019 ◽  
Author(s):  
A.P.K.D. Mendis ◽  
◽  
A. Samaraweera ◽  
D.M.G.B.T. Kumarasiri ◽  
D. Rajini ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Literature Review ◽  
Waste Management ◽  
Construction And Demolition Waste ◽  
Demolition Waste
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