本文選題：非飽和混凝土 + 氯離子�。� 參考：《硅酸鹽通報》2017年04期

【摘要】：實體工程中大多數(shù)混凝土結(jié)構(gòu)由于干濕交替作用處于非飽和狀態(tài),研究非飽和混凝土中的氯鹽侵蝕對混凝土耐久性具有重要的意義。根據(jù)氯離子在混凝土中的傳輸機制,考慮干濕交替過程中水分傳輸?shù)牟町?推導得出氯離子在非飽和混凝土中傳輸?shù)膶α?擴散控制方程。采用精度高的Crank-Nicolson格式對水分擴散方程、氯離子對流-擴散方程進行差分,并用MATLAB軟件編程進行數(shù)值求解。試驗結(jié)果與模型計算結(jié)果吻合良好,通過參數(shù)敏感性分析結(jié)果可知,氯離子濃度隨著混凝土表層孔隙飽和度和干濕比的增加而減小,當混凝土初始飽和度為0.3時氯離子濃度最高。
[Abstract]:Most concrete structures in solid engineering are in unsaturated state because of the alternating action of dry and wet. It is very important to study the chloride corrosion in unsaturated concrete for the durability of concrete.According to the transport mechanism of chloride ions in concrete, considering the difference of moisture transport in the process of dry and wet alternating, the convection-diffusion control equation of chloride ion transport in unsaturated concrete is derived.The water diffusion equation and chloride ion convection-diffusion equation are solved numerically by using Crank-Nicolson scheme with high precision.The experimental results are in good agreement with the model calculation results. The results of parameter sensitivity analysis show that the chloride ion concentration decreases with the increase of surface pore saturation and dry / wet ratio of concrete.When the initial saturation of concrete is 0.3, the concentration of chloride ion is the highest.
【作者單位】： 長安大學公路學院;長安大學材料科學與工程學院;
【基金】：國家自然科學基金面上項目(51278059);國家自然科學基金青年基金(51308062)
【分類號】：TU528
，

本文編號：1765369