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(shí)間的影響-全文預(yù)覽
【正文】 nance 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. 。 relative humidity。 partially saturated concrete。從累積分布 中能估算選定的腐蝕風(fēng)險(xiǎn) 的第一腐蝕 預(yù)期時(shí)間 。 其它參數(shù) 如 參考擴(kuò)散系數(shù) (Dref)、擴(kuò)散衰變常數(shù) (m)、臨界氯離子含量（ Cth）、表面氯濃度 (Cs)、 混凝土保護(hù)層 (X)是從文獻(xiàn)中估計(jì)得到的 。 針對高氯環(huán)境中的混凝土構(gòu)件的腐蝕起始時(shí)間， 本文 運(yùn)用簡化概率分析和部分飽和混凝土 的 鋼筋銹蝕靈敏度參數(shù)在印度 海岸五個(gè)地方調(diào)查 了溫度 3 和相對濕度 (據(jù)地理位置 )的 對比效應(yīng)。因此 ，對于 以選定風(fēng)險(xiǎn) 的 腐蝕 ， 一個(gè) 用來 有效的時(shí)間計(jì)算 的 完整評價(jià)方法是必要的。 這種 變化或不確定性影響選擇和項(xiàng)目調(diào)度問題的保養(yǎng)、維修、和康復(fù)的有效 性 。混凝土中氯離子擴(kuò)散系數(shù)主要取決于混凝土的水灰比 且 隨年齡 (t)、溫度 (t)和相對濕度 (h)而變化， 因此需要按照 一個(gè)地區(qū)的 水合作用和持續(xù)的老化條件計(jì)量數(shù)據(jù)修改 (采用修正 )。一旦 氯離子在鋼筋表面 的濃度超過某
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