外文資料翻譯--溫度和相對濕度對沿印度海岸的鋼筋混凝土構(gòu)件腐蝕起始時間的影響-資料下載頁
2025-05-12 04:35本頁面
【導(dǎo)讀】五個地方處于調(diào)查，運用簡化概率分析和研究鋼筋銹蝕的參數(shù)靈敏度。基于擴散之前入口模型表面氯濃度和變量不斷擴散的系數(shù)。出了某一臨界值腐蝕才開始。地區(qū)考慮溫度和相對濕度數(shù)據(jù)是有必要的。確定方法使用參數(shù)平均值，并提供。腐蝕起始時間對業(yè)主、設(shè)計師或者對及時作出維修。優(yōu)先權(quán)、維修策略、腐蝕防護，以優(yōu)化維護計劃和預(yù)算的組織是有用的。有計劃的維修是最安全、最具性價比的方法。惡化，影響美學(xué)、功能和結(jié)構(gòu)方面的服務(wù)。凝土粘合強度的減弱、強度和延性的降低而斷裂，將導(dǎo)致結(jié)構(gòu)不可挽回的損失和倒塌。銹蝕可能會引起鋼筋混凝土構(gòu)件和建筑的降解。、氯閥值水準(zhǔn)和暴露年齡(t?獻(xiàn)調(diào)查顯示氯化門檻值有很大不同，是一個概率函數(shù)而不是固定或不變的。這樣一個巨大的變化導(dǎo)致使用壽命估計的不同。當(dāng)鋼筋表面的氯濃度超過某一閥值即臨界氯離子濃度時，假定腐蝕開始。其它參數(shù)如參考擴散系數(shù)、擴散衰變常數(shù)、臨界氯離子含量、的腐蝕風(fēng)險的第一腐蝕預(yù)期時間。
【正文】 n of time to corrosion for chosen risk is necessary. Corrosion initiation time is useful for owner, designer, or to an organization to take decision in time of priority of repairs, repair strategy, corrosion protection, sell, purchase, or demolish. In order to optimize maintenance planning and budgeting, planned maintenance at the optimum time is the safest and most cost effective approach. The approach needs up to date information when the structure will need maintenance and repair and hence it is required to predict Corrosion initiation time. The present paper examines the parative effect of temperature and relative humidity (according to the geographic location) at five places along Indian coasts on corrosion initiation time for reinforced concrete members in chloride laden environments using simplified probabilistic analysis and sensitivity of the parameters to 6 reinforcement corrosion for partially saturated concrete. A previously proposed diffusion based chloride ingress model (Srividya and Allampallewar,4) based on Fick’s second law of diffusion and for constant surface chloride concentration condition to perform deterministic analysis for corrosion initiation time is used. Corrosion initiation is assumed when the chloride concentration on steel reinforcement exceeds a threshold value (Cth) . critical chloride concentration. The mean and standard deviation of the correction factors for diffusion coefficient are determined by studying the variations in temperature (T ) and relative humidity (h). The other parameters . reference diffusion coefficient (Dref ), diffusion decay constant (m), critical chloride content (Cth), surface chloride concentration (Cs), and concrete cover (X), are estimated from literature. Simplified probabilistic analysis consists of determining the partial derivatives of each uncertain input parameter of the model by evaluating variations in the corrosion initiation time caused by variations in each of the uncertain input parameters of the model. The partial derivatives are used to calculate variance of each parameter and then variance of model output . corrosion initiation time. Probability density function and cumulative probability distributions are plotted. From cumulative distribution the expected time of first corrosion for chosen risk of corrosion can be estimated. From sensitivity analysis, ranking of the most relevant parameters affecting the time to corrosion initiation is carried out.
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