• General Article

    The impacts of public housing program on housing prices: The case of South Korea
    Jinsoo Ko and Chunil Kim
    Policy interventions in the housing sector are mainly designed to stimulate the provision of affordable housing. Countries across the world, however, seem … + READ MORE
    Policy interventions in the housing sector are mainly designed to stimulate the provision of affordable housing. Countries across the world, however, seem to grapple with harsh opposition to public housing developments, which local residents tend to blame for a decrease in property values and the deterioration of their neighborhoods. South Korea has continued to expand their stock of affordable housing, but aggressive opposition from surrounding residents is frequently observed. This study adds to the existing literature by conducting an impact analysis of the major public housing program in Korea using the DID (difference-in-differences) methodology. The statistical evaluation results of the selected public housing projects exhibit mixed outcomes, in terms of the impact of public housing projects on surrounding housing prices. The empirical results of this study suggest that the small-scale and scattered provision of public housing in gentrifying areas is the least likely to generate negative housing value impacts on nearby neighborhoods. - COLLAPSE
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    30 December 2022

  • General Article

    Cooling energy-saving potential of a green roof in Brazilian climates
    Luan Maximiano de Oliveira da Costa, Frederico Romagnoli Silveira Lima, Marcela Alvares Maciel and Raquel Diniz Oliveira
    The objective of this study was to investigate the cooling energy-saving potential of a green roof under different climates comparing green roofs … + READ MORE
    The objective of this study was to investigate the cooling energy-saving potential of a green roof under different climates comparing green roofs with concrete slabs in Brazil. Eight cities were chosen to represent distinct conditions, according to the Köppen-Geiger climate classification. A numerical simulation was carried out to analyze the roof energy-saving potential for an office building, based on Sailor’s vegetated rooftop model. A sensitivity analysis was performed using a paired t-test and multivariate factorial analysis and considering the leaf area index (LAI) and substrate layer thickness. The results showed that significant annual cooling energy savings were achieved by the green roof for 6 of the 8 climate classifications analyzed. Since the substrate layer thickness was not as relevant as the LAI, the green roof strategy could also be used for building retrofits, with the optimal composition being a substrate layer thickness of 5 cm and LAI equal to 5.00. As a key finding of this investigation, the cooling energy-saving potential of the green roof strategy was verified under all distinct climates tested in Brazilian territory. Through these results, its performance and benefits were highlighted and quantified, considering the most important design parameters that could achieve this goal. - COLLAPSE
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    30 December 2022

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    Behavioral investigation of the footings on geosynthetics-reinforced ferrochrome slag
    Manal Alali, Bandita Paikaray and Benu Gopal Mohapatra
    The rapid growth in all sectors puts great pressure on natural resources, making them vulnerable to depletion, not to mention the huge … + READ MORE
    The rapid growth in all sectors puts great pressure on natural resources, making them vulnerable to depletion, not to mention the huge volume of waste, which is an inevitable result of this growth, especially industrial ones. These challenges drove researchers to seek sustainable alternatives with the least dependence on natural resources and invest in industrial wastes simultaneously. In the last decade, ferrochrome slag was able to draw the attention of researchers to use it in the construction sector, but it did not have an opportunity to prove its worth as a foundation material despite its outstanding physical and mechanical properties. In the current research, and after verifying the environmental acceptance of ferrochrome slag through the leaching test to determine the toxicity of waste seeping into the ground, an experimental investigation was carried out through a series of laboratory model footing tests using a bed of ferrochrome slag with a medium relative density of 65%, the bearing capacity of each square and rectangular foundation that laying on the slag bed was evaluated in unreinforced and reinforced conditions with two different types of geosynthetic materials, geogrid and geotextile (non-woven), the variable parameters included the type of footing, the sort of reinforcement and the number of reinforcement layers. The findings showed a good response to the inclusion of the geosynthetic layers, adding a layer of geogrid, two and three layers increased the bearing capacity of square footing by 7%, 32%, and 52%, respectively. The bearing capacity ratio (BCR) with adding three layers of geotextile for rectangular footing (1.95) was found to be better than that of square footing (1.64), however, for three layers of the geogrid, the BCR value of square footing (1.52) was slightly more than that of rectangular footing (1.48). The environmental acceptance and the good response to the geosynthetics open up the chance for the ferrochrome slag to stand out as a sustainable alternative to granular footing materials, with geotextiles outperforming their geogrid counterparts in improving the bearing capacity of both types of foundations studied. - COLLAPSE
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    30 December 2022

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    Optimization of ultra-high-performance concrete properties cured with ponding water
    Wissam Nadir, Iman Kattoof Harith and Ammar Yasir Ali
    This work conducted laboratory tests to assess the use of normal ponding water curing to produce ultra-high-performance concrete (UHPC). The curing regime … + READ MORE
    This work conducted laboratory tests to assess the use of normal ponding water curing to produce ultra-high-performance concrete (UHPC). The curing regime is one of the most significant factors that influence the quality of cast-in-place UHPC. Usually, in precast concrete, a steam curing regime is used to attain high early strength. Therefore, this study presents experimental results on determining whether a specified compressive strength of UHPC can be achieved by using normal ponding water curing without heat treatment. The experimental results of this experiment included investigating the compressive strength and flow of UHPC made with different water-to-binder ratio (w/b), superplasticizer dosages (SP) and silica fume content (SF). The derived statistical model was able to accurately simulate the studied variables and the attained responses. Numerical optimization was then implemented to attain an optimum mix with the proper flow and maximum compressive strength. The use of 15.68% w/b, 3.5% SP and 190 kg/m3 SF in the mix can be considered as the most suitable content to be employed in UHPC mixes, which satisfied the limit values of compressive strength and flow when using normal ponding water curing. The predicted optimized value of 28-day compressive strength and optimized value of the flow of UHPC were 135.740 MPa and 210 mm respectively, while the experimental value of them was 132.18 MPa and 220 respectively. This means only a 2.62% and 4.76% variation between the predicted and experimental results. - COLLAPSE
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    30 December 2022

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    The spatial analysis of the relationship between cooling centers and vulnerable areas to heat waves in Seoul
    Sora Han and Hyekyung Lee
    As heat waves are becoming more frequent and extreme due to global warming, the Seoul metropolitan government has implemented policies to plan … + READ MORE
    As heat waves are becoming more frequent and extreme due to global warming, the Seoul metropolitan government has implemented policies to plan and operate cooling centers to prevent heat-related diseases. However, there is a lack of research that finds the relationship between the spatial distribution of cooling centers and vulnerability to heat waves. Therefore, this study aims to analyze whether the distribution of cooling centers throughout 425 administrative dongs in Seoul significantly relates to regional heat wave vulnerability. For this research, variables of climate exposure, sensitivity, and adaptability of 425 administrative dongs in Seoul were considered, and vulnerable areas to heat waves were identified by analyzing the Vulnerable-Resilience Index (VRI). Also, Hotspot analysis and ANOVA were conducted to find the relationship between the distribution of heat wave vulnerable areas and cooling centers. As a result, it showed that the existing distribution of cooling centers in Seoul needs to be improved by considering spatial vulnerability to heat waves for better accessibility. Based on the spatial analysis, additional cooling centers should be installed in some administrative dongs in Jung-gu, Yongsan-gu, Seongbuk-gu, and Gwanak-gu, Seoul. The results of this study would help provide guidelines for planning cooling centers with great accessibility to a vulnerable population. - COLLAPSE
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    30 December 2022

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    The challenges of sustainable buildings in Nigeria
    Ahmed Abdullahi Alhassan, Yacim Joseph Awoamim, Umar DanAzumi Yusuf and Musa Usman Dogara
    The world has gradually moved from conventional buildings to more sustainable ones that promote greater energy efficiency and less environmental impact. However, … + READ MORE
    The world has gradually moved from conventional buildings to more sustainable ones that promote greater energy efficiency and less environmental impact. However, while the developed countries have steadily embraced the concept of sustainability in their buildings. Nigeria, like most of the Sub-Saharan African countries, is still grappling with traditional building architecture and designs. Previous empirical analyses reveal three (3) competing elements at the berk of current challenges: awareness, poverty (absence of funds) and lack of motivation. Therefore, the objective of this study was not only to evaluate the challenges of sustainable buildings but to focus on the readiness of academic institutions to create awareness among the people so that sustainability is incorporated into building development in Nigeria. The literature search and interviews were used to achieve the study objective. Findings reveal that lack of awareness and finance to going green are Nigeria’s twin main challenges of sustainability. Additionally, results also show the unwillingness of the people to adopt because of social and cultural reasons and the lack of government legislation and incentives that would encourage developers to incorporate green building features into their construction projects. The educational institutions are, however, willing to assist in teaching students, organizing conferences, outreaches, and workshops and creating awareness of the benefits of sustainable green buildings. - COLLAPSE
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    30 December 2022

  • General Article

    Design of learning spaces in the post-pandemic era
    Tugce Pekdogan
    During the pandemic, online education has been adopted at all levels of education, and face-to-face lessons have started to be given with … + READ MORE
    During the pandemic, online education has been adopted at all levels of education, and face-to-face lessons have started to be given with the reduction of the effects of the pandemic. For this reason, educational areas should be reconsidered, and online learning and face-to-face teaching should be supported. Various measures and design strategies can be taken to reduce the risk of infection in closed areas have been mentioned in the literature. This article provides comprehensive research on measures that can be taken to reduce the risk of disease and maintain a healthy indoor environment in the classroom. It also offers conceptual approaches for engineers, designers, and architects in the building construction industry to adopt these strategies in course space design. These design strategies were gathered under three headings and examined, and techniques that could be applied were determined by considering the needs of nature, technology, and society. - COLLAPSE
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    30 December 2022

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    Construction waste management in the context of de-tools, industry 4.0 & circular economy, a critical review of pune metropolitan area, India
    Ravindra Rahigude, Dr Doreshor Khwairakpam, Sanjay Rade and Krupali Kadam
    The Product design process debates about resource consumption in which Linear Economy generates more environmental waste and Circular Economy (CE) looks at … + READ MORE
    The Product design process debates about resource consumption in which Linear Economy generates more environmental waste and Circular Economy (CE) looks at the waste as an opportunity. As Industrial revolutions progressed from Industry 1.0 to 4.0 it degraded the environment, resulting in climate change and global warming. The production process for products consumes more natural and technological resources in its first & subsequent life cycles. The Construction Industry generates a major portion of total urban waste and its management is the biggest challenge. This paper reviews the role of project proponents (PP), construction demolition tools, (CE), Industry 4.0 technology from CE perspective. To understand the various construction demolition tools, industrial revolutions, and management of Construction Demolition Waste (CDW) secondary data was referred from research journals, Youtube, national level newspapers etc. The study area’s CDW management challenges are reviewed from I 4.0 & CE perspective at macro and meso level using case studies, and microlevel products are descoped due to vast scope of work. The analysis and results of the case studies are tabulated with the help of text, images, google earth images, development plan proposals etc. Newspaper articles are cross referenced to highlight the concerns about environmental degradation due to CDW. In conclusion, through above approach, green jobs and green economy will be generated. The global south’s challenges linked to Responsible Consumption and Production (SDG 12) can be addressed through it. - COLLAPSE
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    30 December 2022
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