• Title/Summary/Keyword: 내구 성능

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A Study on Selection of Target Performance for Performance Evaluation and Maintenance of Retaining Wall in Korea (국내 옹벽의 성능평가와 유지관리를 위한 목표 성능 선정에 관한 연구)

  • Choi, Jae Soon
    • Journal of the Korean Geotechnical Society
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    • v.35 no.12
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    • pp.111-121
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    • 2019

  • In the revised 2019 Guidelines for Facility Safety and Maintenance, the existing safety-oriented facility evaluations have expanded from performance evaluations to added durability and serviceability. This expansion reflects the life cycle of facilities and the service abilities of facilities, which are becoming a global issue. However, since the performance evaluation of facilities is linked to repairing and reinforcement, the related researches such as the correlation of each performance and the target performance related to the decision on priority are necessary. In this study, through the analysis of historical data of existing facility safety evaluation results centered on the retaining earth wall installed in domestic road facilities, the appropriate target performance was suggested for the maintenance of the facility based on the revised performance evaluation. Also, the performances on the actual two retaining walls were evaluated for example and analyzed the verification of the target performance. Besides, new indicators were presented to add serviceability to the performance evaluation of retaining earth walls consisting of safety and durability.

  • https://doi.org/10.7843/kgs.2019.35.12.111 인용 PDF KSCI

Durability Evaluation of Cement Concrete Using Ferrosilicon Industrial Byproduct (페로실리콘 산업부산물 활용 시멘트 콘크리트의 내구성능 평가)

  • Chang-Young Kim;Ki Yong Ann
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.11 no.1
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    • pp.89-96
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    • 2023

  • In this paper, a ferrosilicon by-product was evaluated to confirm the feasibility of recycling it as supplementary cementitious material of ordinary Portland cement in concrete. Three different levels of replacement ratio (10 %, 20 % and 30 % of total binder) were applied to find which is the most beneficial to be used as a binder. Ferrosilicon concrete was initially assessed at setting time and compressive strength. Durability was evaluated by the resistance to chloride penetration test(RCPT) and alkali-silica reaction(ASR) with a comparison to silica fume concrete due to their similarity in chemical composition. The porosimetry and X-ray diffraction analysis along with energy dispersive X-ray spectroscopy give information on the microstructural characteristics of the ferrosilicon concrete. It was found that 10 % ferrosilicon concrete has higher strength while 20 %, 30 % have lower strength than OPC concrete. However, chemical resistance to chloride attack is higher when replacement is increased. Compared to silica fume, the durability of ferrosilicon might be less efficient however, it is obviously beneficial than OPC. High SiO2 content in ferrosilicon results in producing more C-S-H gel which could make denser pore structure. Most of the risk of alkali silica reaction to silicate binders through length change tests was less than 0.2 %, and both mortar using ferrosilicon and silica fume showed better resistance to alkali silica reaction as the substitution rate increased.Reuse of industrial waste rather than producing highly refined additives might reduce environmental load during manufacture and save costs.

  • https://doi.org/10.14190/JRCR.2023.11.1.89 인용 PDF

Durability of High Early Strength Concrete Using Fine Particles Cement (미립자 시멘트를 이용한 조강 콘크리트의 내구성 검토)

  • Kim, Yong-Jic;Park, Sang-Joon;Kim, Kyoung-Min
    • Journal of the Korea Concrete Institute
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    • v.23 no.6
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    • pp.757-763
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    • 2011

  • In order to secure the effective high early age strength of the concrete, the study was carried out with a goal of functional improvement of cement. This study was carried out as a follow up for the previous study, which analyzed the high early age strength and durability of concrete mixed with fine particle cement (FC) during cement production. The experimental results showed that the target range for each mix was satisfied at fresh state of concrete. Also, when mixed with fine particles cement, the setting time improved. Additionally, compressive strength and heat of hydration increased and remained same, respectively. Especially, the durability remained same even when mixed with fine particle cement.

  • https://doi.org/10.4334/JKCI.2011.23.6.757 인용 PDF KSCI