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  • Page : 28 - 37 DOWNLOAD
  • 내부식성 콘크리트 개발을 위한 기초연구로서 개질유황 혼합 콘크리트의 물성 평가
  • Due to the increased construction of offshore concrete structures and the use of de-icing salts for the purpose of snow removal, the needs for the development of anti-corrosive concrete are increasing. To solve these problems, an evaluation of the mechanical and durability properties for concrete were conducted by mixing modified-sulfur as 0 %, 5 %, 10 %, 15 % cement weight ratio. Both strengths and the properties affecting durability such as water absorption coefficient, chloride ion permeability, accelerated carbonation resistance, rapid freezing and thawing, and chemical resistance were evaluated. All evaluations performed were according to the test specifications associated KS. The results indicate that mixing of modified-sulfur lowed chloride ion permeability and improved chemical resistance.
  • KEYWORDs : durability, accelerated corrosion test, salt damage, carbonation test, tidal zone
  • AUTHORs : 박상순†·나옥정
  • Page : 18 - 27 DOWNLOAD
  • 염해 및 동결융해의 복합열화 작용에 의한 부식촉진시험에 관한 연구
  • In this study, the accelerated corrosion test by combined deteriorating action of salt damage and freeze-thaw was investigated. freeze-thaw cycle is one method for corrosion testing; corrosion initiation time was measured in four types of concrete samples, i.e., two samples mixed with fly ash (FA) and blast furnace slag (BS), and the other two samples having two water/cement ratio (W/C = 0.6, 0.35) without admixture (OPC60 and OPC35). The corrosion of rebar embedded in concrete occurred most quickly at the 30th
    freeze-thaw cycle. Moreover, a corrosion monitoring method with a half-cell potential measurement and relative dynamic elastic modulus derived from resonant frequency measures was conducted simultaneously. The results indicated that the corrosion of rebar occurred when the relative dynamic elastic modulus was less than 60%. Therefore, dynamic elastic modulus can be used to detect corrosion of steel bar. The results of the accelerated corrosion
    test exhibited significant difference according to corrosion periods combined with each test condition. Consequently, the OPC60 showed the lowest corrosion resistanceamong the samples.
  • KEYWORDs : accelerated corrosion test, artificial seawater, relative dynamic modulus of elasticity, concrete
  • AUTHORs : 박 상 순† · 소 병 탁
  • Page : 13 - 17 DOWNLOAD
  • Evaluation of Iron Nickel Oxide Nanopowder as Corrosion Inhibitor: Effect of Metallic Cations on Carbon Steel in Aqueous NaCl
  • The aim of this study was to evaluate the use of iron-nickel oxide (Fe2O3.NiO) nanopowder (FeNi) as an anti-corrosion pigment for a different application. The corrosion protection ability and the mechanism involved was determined using aqueous solution of FeNi prepared in a corrosive solution containing 3.5 wt.% NaCl. Anti-corrosion abilities of aqueous solution were determined using electrochemical impedance spectroscopy (EIS) on line pipe steel (API 5L X-80). The protection mechanism involved the adsorption
    of metallic cations on the steel surface forming a protective film. Analysis of EIS spectra revealed that corrosion inhibition occurred at low concentration, whereas higher concentration of aqueous solution produced induction behavior.
  • KEYWORDs : bode, neutral, corrosion, inductive, nyquist
  • AUTHORs : A. U. Chaudhry†, Vikas Mittal, and Brajendra Mishra
  • Page : 6 - 12 DOWNLOAD
  • A Numerical Study on Flow-Accelerated Corrosion in Two Adjacent Elbows
  • Flow-Accelerated Corrosion (FAC) is a well-known degradation mechanism that attacks the secondary piping in nuclear power plants. Since the Surry Unit 2 event in 1986, most nuclear power plants have implemented management programs to deal with damages in carbon and low-alloy steel piping. Despite the utmost efforts, damage induced by FAC still occurs in power plants around the world. In order to predict FAC wear, some computer programs were developed such as CHECWORKS, CICERO, and COMSY. Various data
    need to be input to these programs; the chemical composition of secondary piping, flow operating conditions and piping geometries. CHECWORKS, developed by the Electric Power Research Institute (EPRI), uses a geometry code to calculate geometry effects. Such a relatively simple geometry code is limited in acquiring the accuracy of FAC prediction. Recently, EPRI revisited the geometry code with the intention of updating it. In this study, numerical simulations were performed for two adjacent 90° elbows and the results were
    analysed in terms of the proximity effect between the two adjacent elbows.
  • KEYWORDs : flow accelerated corrosion, computation fluid dynamics, proximity, mass transfer coefficient
  • AUTHORs : Hun Yun, Kyeongmo Hwang, Seung-Jae Moon†
  • Page : 1 - 5 DOWNLOAD
  • Anti-corrosive Effects of Multi-Walled Carbon Nano Tube and Zinc Particle Shapes on Zinc Ethyl Silicate Coated Carbon Steel
  • Zinc ethyl silicate coatings containing multi walled carbon nanotubes (MWCNTs) were prepared, to which we added spherical and flake shaped zinc particles. The anti-corrosive effects of MWCNTs and zinc shapes on the zinc ethyl silicate coated carbon steel was examined, using electrochemical impedance spectroscopy and corrosion potential measurement. The results of EIS and corrosion potential measurement showed that the zinc ethyl silicate coated with flake shaped zinc particles and MWCNT showed lesser protection to corrosion. These outcomes were in agreement with previous results of corrosion potential and corrosion occurrence.
  • KEYWORDs : EIS, zinc ethyl silicate, corrosion potential, slat spray, MWCNT
  • AUTHORs : JiMan Jang, MinYoung Shon, and SamTak Kwak†