• General Article

    Improving the moisture performance of hot mix glass asphalt by high-density polyethylene as an asphalt binder modifier
    Behbahani Hamid, Hamedi Gholam Hossein, Najafi Moghaddam Gilani Vahid and Nikookar Mohammad
    In this study, the waste plastic bottles have been used as a kind of known high-density polyethylene (HDPE) in order to modify ... + READ MORE
    In this study, the waste plastic bottles have been used as a kind of known high-density polyethylene (HDPE) in order to modify the characteristics of asphalt binder in the hot mix glass asphalt (HMGA). The present glass asphalts have been constructed using 6, 12, 18 and 24% waste crushed glasses (WCG). To investigate the HDPE moisture susceptibility, Marshall Stability and Indirect Tensile Strength (ITS) tests were conducted on different combinations of HMGA. The results indicated that the combination of 18% WCG and 6% HDPE is the best value for the resistance of asphalt mixtures against moisture susceptibility. However, increasing the amount of HDPE more than 6%, reduces the performance of the asphalt binder and aggregate system against stripping. By increasing the amount of WCG, the Marshall resistance of all asphalt mixtures will be increased compared to the controlled ones. Although, the asphalt binder modification of the HMGA mixtures using HDPE, increases their Marshall resistance comparing to the controlled and unmodified HMGA samples, this increase will be up to 9% HDPE. And higher values will reduce the Marshall resistance. - COLLAPSE
    December 2019
  • General Article

    A study on the environmental impact prediction method of bridge life cycle maintenance using bridge maintenance database
    Hyunsik Kim, Sungho Tae and Yonghan Ahn
    Environmental impact analyses of infrastructural elements (through life cycle assessment) have been actively pursued worldwide, as a strategy for sustainable structural development ... + READ MORE
    Environmental impact analyses of infrastructural elements (through life cycle assessment) have been actively pursued worldwide, as a strategy for sustainable structural development. Accordingly, data pertaining to structures are required to enable the prediction of environmental impact. In the particular case of bridge structures, although actual maintenance performance is managed in the form of various datasets, little research has resulted from the use of this data, and has mostly involved limited scenarios that are used to estimate the environmental impact of the maintenance stage. The purpose of this study is to propose an equation model that uses inputs regarding bridge maintenance to evaluate the environmental impact of the maintenance of a bridge structure. For this purpose, the use of different maintenance methods and the ratio of the bridge maintenance area to total area based on maintenance method used were calculated using the road bridge maintenance performance dataset of Korea, and the proportion of main input materials used for each maintenance method was estimated. In addition, an equation model for estimating the annual bridge maintenance environmental impact was proposed using these results, and the environmental impact per unit area due to the maintenance of road bridges in Korea was evaluated. - COLLAPSE
    December 2019
  • General Article

    An analytical study on the prediction of carbonation velocity coefficient using deep learning algorithm
    Dohyun Jung and Hanseung Lee
    In present paper, we have studied the prediction method to determine the carbonation velocity coefficient of the concrete using deep neural network ... + READ MORE
    In present paper, we have studied the prediction method to determine the carbonation velocity coefficient of the concrete using deep neural network (DNN). The accelerated carbonation test data for 291 mixtures were used as training data with different experimental variable such as water to binder ratio, admixture (blast furnace slag and fly ash), fine aggregate and coarse aggregate as input data. Therefore, the carbonation velocity coefficient was calculated for 5% CO2, 60% relative humidity, and 20°C temperature. The model-based learning set was 5 hidden layers, 15% validation data ratio and 64 batch data size. Under this study condition, all model-based learnings were trained to the point where the learning was not overfitted. The performance of the DNN model exhibit 9.91% mean absolute percentage error. We compared the DNN model with linear prediction equations proposed by Kishitani, Hamada, and Shirayama equation. The carbonation velocity coefficient (mm/year) which were calculated using accelerated carbonation experiment and compared with DNN model and linear prediction equations. The mean absolute percentage error of DNN model was 12.00%, which was smaller than that of the linear prediction equations of Kishitani, Shirayama and Hamada. - COLLAPSE
    December 2019
  • General Article

    A review of success factors for the adoption of green construction site practices in developing countries
    Hilary Omatule Onubi
    The advocates of sustainability in the construction process have identified some conditions whose presence are necessary to facilitate the smooth and seamless ... + READ MORE
    The advocates of sustainability in the construction process have identified some conditions whose presence are necessary to facilitate the smooth and seamless adoption of green practices on construction sites, to ensure sustainability of the environment. These conditions have been referred to as success factors. This paper presents a detailed review of success factors (SFs) needed for contractors to successfully adopt green practices on construction sites in developing countries. Peer reviewed articles published in reputable journals were reviewed. By systematically reviewing 51 recent literatures related to the subject matter, many success factors for green practices adoption on construction sites were identified. The factors identified include: client related factors, contracting organization related factors, the economic factors of the construction area, environmental factors, site related factors, other stakeholders’ factors among many others. It is concluded that various success factors for the adoption of green construction site practices (GCSPs) with each interacting with the others. This paper will improve the understanding of contractors on the various factors that interplay to create an environment supportive for the adoption of green construction practices (GCPs) on construction sites based on the peculiarities of the construction environment in developing countries. It is recommended that clients and contractors should take note of these factors during the conception of the construction projects to ensure a smooth adoption process of green site practices. - COLLAPSE
    December 2019
  • General Article

    Evaluation of building energy and daylight performance according to applying electrochromic and pdcl (polymer dispersed liquid crystal) to office building in South Korea
    Myunghwan Oh and Jaesung Park
    In this study, building energy and daylight performance were analyzed when electrochromic and polymer dispersed liquid crystal (PDLC) double glazings, which are ... + READ MORE
    In this study, building energy and daylight performance were analyzed when electrochromic and polymer dispersed liquid crystal (PDLC) double glazings, which are a type of solar control glass, were applied to an office building. An analysis model of the office building was constructed based on the spectral data of the two types of solar control glass. The building energy and daylight performance were analyzed in the colored state for the summer season and in the clear state for the winter season. In the case of the building energy, the electrochromic double glazing could save 31.7% of the energy and the PDLC double glazing 25.1% compared to conventional low-e double glazing. As for the discomfort glare reduction performance in the daylight, the PDLC double glazing exhibited a higher discomfort glare reduction effect owing to its narrower visible-light transmittance range and lower transmittance in the clear state compared to the electrochromic double glazing. When the time ratio of comfort daylight illuminance, which corresponds to the daylight performance, was analyzed, the electrochromic double glazing (54.4%) exhibited a 155.2% increase compared to the low-e double glazing (35.6%). The PDLC double glazing (52.5%) showed a 149.1% increase, indicating that both glazings improved the time ratio of appropriate indoor illuminance. The performance evaluation results showed that the two types of solar control glass had benefits and drawbacks, and that both were effective in improving the building energy and daylight performance. - COLLAPSE
    December 2019
  • General Article

    Evaluation of environmental impact change due to building envelopment retrofit by parts: green remodeling
    Daehong Kim and Hyeongjae Jang
    The purpose of this study is to provide the basic data on the environmental impact increase and decrease according to the envelopment ... + READ MORE
    The purpose of this study is to provide the basic data on the environmental impact increase and decrease according to the envelopment retrofit by each part of green remodeling. The difference of the environmental impact occurred during the remaining life of the green remodeling and the non-green remodeling is compared. The study is carried out with case study using life cycle assessment(LCA) method. Based on the goal, functional units, system boundaries, and notation of results are proposed. The system boundary for the environmental impact evaluation of green remodeled buildings is proposed and 6 major environmental impacts are shown as results. In addition, the environmental impacts of the envelopment improvement conditions are analyzed by case studies. From the green remodeling process stage, the change of environmental impact is evaluated by life cycle. As a result of the case evaluation, the GWP and AP decreased due to the energy saving of the green remodeling. However, ADP, EP, ODP, and POCP have shown increase. - COLLAPSE
    December 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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