• General Article

    Investigating the impact of post-disaster temporary housing form on energy consumption in 4 climate of iran
    Mohammad Reza Mojahedi, Dr. Mohsen Vafamehr and Dr. Ahmad Ekhlasi
    The first thing that could create security and comfort in the disaster-affected people is to have a good housing for the family ... + READ MORE
    The first thing that could create security and comfort in the disaster-affected people is to have a good housing for the family to gather together. Therefore, it is important to supply thermal comfort of the users when designing and building temporary housing. Given the effective and improving role of shapes on the thermal function of buildings, it is essential to achieve the optimal shape for temporary housing. The present study was conducted to obtain an optimal shape for post-disaster temporary housing and to save fossil fuels and energy consumption (in cooling and heating). Based on the hypotheses, reducing the area of the external shell of building by changing the cube shape of temporary housing saves energy. To test the hypothesis, the causal method (thermal simulation) using DesignBuilder software with Plus Energy Motor was employed. Following investigations and obtaining an optimal plan area for the temporary housing using Delphi method, the energy demand of buildings was measured by changing the parameters of various shapes including cube, prism, cylinder, dome (hemisphere), cone and Khalili shapes. Results of the study in four different climates confirmed the hypothesis. Findings show that depending on the climate, Compared to a cube, a hemisphere save energy by about 24 to 36% in each climate on average. depending on the climate, When changing the flat form of a cube ceiling into a barrel vault, save energy by about 17 to 25% in each climate on average. - COLLAPSE
    September 2019
  • General Article

    Influence of natural pozzolan and blast furnace slag on hydration and physico-mechanical properties of cement
    M. Laakri, M.N. Oudjit and H. Saidani-Scott
    his study presents the hydration mechanisms and physico-mechanical characteristics of cements composites based on Portland cement, natural Pozzolan (PZ) and blast furnace ... + READ MORE
    his study presents the hydration mechanisms and physico-mechanical characteristics of cements composites based on Portland cement, natural Pozzolan (PZ) and blast furnace slag (BFS). The Vicat test indicates a reduction in the initial setting time. X-Ray Diffraction (XRD) analysis was used to evaluate the pozzolanic reactivity of mineral additions. The curve of heat released of M20 (20% PZ, 80% cement), shows that the dormant period was shortened by a rapid resumption of hydration reactions compared to the control. The mechanical activation, combined to the thermal activation has significantly increased the strength at early and medium term. The micrographs obtained by Scanning Electron Microscopy (SEM) show greater compactness in blended cements and a change in microscopy and pore’s structure depending on the additions and curing temperature. - COLLAPSE
    September 2019
  • General Article

    Evaluation of carbonation depth of high calcium fly ash blended concrete
    Kibong Park and Wang Xiao-Yong
    High calcium fly ash (FH) is the combustion residue in electric power plants burning lignite or sub- bituminous coal and can be ... + READ MORE
    High calcium fly ash (FH) is the combustion residue in electric power plants burning lignite or sub- bituminous coal and can be used to produce high performance concrete. For concrete incorporating FH, hydration of Portland cement and reaction of FH will proceed simultaneously. Hence the carbonation of FH blended concrete is much more complex than that of control concrete. This paper presents a numerical procedure to evaluate carbonation depth of FH blended concrete. This numerical procedure consists of a blended cement hydration model and a carbonation reaction model. First, by using the blended cement hydration model considering cement hydration, reaction of free CaO in FH, and reaction of other phases in FH except free CaO, the properties of hardening FH blended concrete, such as calcium hydroxide contents, calcium silicate hydrate contents, reaction degree of high calcium fly ash, and porosity can be determined. Second, by using the carbonation reaction model, the diffusivity of CO2 in FH blended concrete is calculated and the carbonation depth of FH blended concrete is predicted. The proposed numerical procedure is verified using experimental results of FH blended concrete with different water to binder ratios and high calcium fly ash replacement ratios. - COLLAPSE
    September 2019
  • General Article

    Case study of risk management for high-rise buildings using a control chart: schedule management of the busan M tower residential apartment complex
    Youngsang Kim, Seungjun Roh, Woosuk Kim, Jongkook Lee and Yoonkeun Kwak
    The purpose of this study is to analyze the risk cases of schedule management for high-rise buildings using a control chart to ... + READ MORE
    The purpose of this study is to analyze the risk cases of schedule management for high-rise buildings using a control chart to manage the target management information in the upper and lower boundaries. To that end, the present study examines the process of high-rise building projects that were constructed in Busan, South Korea, and analyzes the inherent risks of the high-rise building projects using a control chart. By presenting the importance and threatening factors of the schedule management for high-rise building projects, the present study is expected to help the risk management of similar projects in the future. - COLLAPSE
    September 2019
  • General Article

    A Study on Reduction of Fine Dust in Relation to National Greenhouse Gas Inventory
    Sungkyun Ha, Sungho Tae and Rakhyun Kim
    With the increase in economic activities in Korea since 1970, air pollution problems such as greenhouse gases and fine dust have started ... + READ MORE
    With the increase in economic activities in Korea since 1970, air pollution problems such as greenhouse gases and fine dust have started to occur. In recent years, the risk of fine dust has become well known, causing the requirement for it to be reduced. Therefore, this study investigates mitigation methodology to reduce fine dust at the national level. In addition, fine dust and greenhouse gases both originate from fuel combustion. Therefore, they have been studied in connection with the national greenhouse gas emissions. Furthermore, this research was conducted on the building sector. Existing literature involves studies to reduce concentrations at the building and city levels. However, these studies focused on reducing total dust emissions at the national level. This study primarily analyzed the items proposed in the "Micro Dust Management Plan" and proposed a method to reduce fine dust. In addition, it was established that the national greenhouse gas emissions and emission sources are very similar, suggesting a linkage in reduction plans. - COLLAPSE
    September 2019
  • General Article

    Evaluation of UV curing polymer electrolyte based electrochromic laminated glass
    Myunghwan Oh and Jaesung Park
    In order to solve the problems of durability and structural stability, electrochromic laminated glass was manufactured using high strength electrolyte. The electrochromic ... + READ MORE
    In order to solve the problems of durability and structural stability, electrochromic laminated glass was manufactured using high strength electrolyte. The electrochromic glass developed in this study used tungsten oxide as the discoloring layer and nickel oxide as the ion storage layer. And the electrolyte was developed by synthesizing a polymer chemical resin based on lithium ions. As a result of evaluation of bonding strength of electrochromic glass, it was analyzed that 2.04 times improvement compared to existing gel type electrolyte. The ion conductivity was 2.57 × 10-4 S/cm that performance similar to that of the gel electrolyte. The discoloration efficiency was 83.08 cm2/C, which was superior to gel electrolyte. As a result of the optical characteristic analysis, the change in solar transmittance was 53.1% and the visible light transmittance was 57.3%, indicating that it is effective to reduce building energy under domestic climate conditions where summer and winter are clear. - COLLAPSE
    September 2019
  • General Article

    Greenhouse gas emission analysis for each material composition of a cement reactive siloxane polymer-based penetration resist agent
    Rakhyun Kim, Sungho Tae and Hyojin Lim
    According to maintenance technology, in order to calculate the increase in service life of structures and reduction in environmental load, a quantitative ... + READ MORE
    According to maintenance technology, in order to calculate the increase in service life of structures and reduction in environmental load, a quantitative environmental impact assessment is necessary. There must be a basic unit quantifying environmental impact emission for building materials. This study aims to use polysiloxane and perform life cycle greenhouse gas emission evaluation based on an optimal composition ratio of a cement reactive siloxane polymer-based compound and penetration resist agent. Accordingly, the greenhouse gas emission of this agent was evaluated by securing basic data and life cycle inventory database for raw materials such as isophorone diisocyanate, ethylene glycol, and polydimethylsiloxane. An evaluation of greenhouse gas emission of the penetration resist agent was performed, and the greenhouse gas emissions of the agent at different composition ratios were comparatively analyzed. According to the evaluation, the carbon dioxide emission 1.68 kg-CO2eq/m2 showed the highest contribution 93.51% in the overall emission of 1.94 kg-CO2eq/m2 - COLLAPSE
    September 2019
  • General Article

    Comparison of green building standards in the united states and china
    Yi-Wei Ding, Sungho Tae and Seungjun Roh
    With the development of green buildings in China, the LEED green building rating standards are becoming familiar to the public and industry ... + READ MORE
    With the development of green buildings in China, the LEED green building rating standards are becoming familiar to the public and industry. This work analyzes the interpretation of the LEED evaluation system as applied to China. It includes a comparative analysis of the LEED and green building evaluation standards in the 2014 version, and analyzes the limitations in implementation in China. In reference to the successful experience of LEED, suggestions for improving Chinese green building evaluation standards are made. - COLLAPSE
    September 2019
Journal Informaiton International Journal of Sustainable Building Technology and Urban Development International Journal of Sustainable Building Technology and Urban Development
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