干湿交替环境下带非贯通裂缝混凝土中氯离子传输规律

Chloride Transport in Concrete With Non-penetrating Cracks Under Dry-Wet Cycles

摘要:

为了获得干湿交替作用下开裂混凝土中氯离子传输规律，通过拉普拉斯变换方法，建立了干湿交替作用下带非贯通裂缝混凝土中的氯离子对流扩散模型，分析了裂缝宽度和裂缝深度对氯离子含量分布的影响，统计了裂缝参数与表面氯离子含量的关系.结果表明：随着裂缝宽度和裂缝深度的增加，混凝土表面氯离子含量积累加快，从而加速了氯离子传输；与现有模型相比，本文理论模型精度提高了30%.

Abstract:

To investigate the chloride transport behavior in cracked concrete under dry-wet cycles， a chloride convection-diffusion model for non-penetrating cracks in concrete was developed using the Laplace transform. The effects of crack width and depth on the chloride content distribution was analyzed and the relationship between crack parameters and surface chloride content was established in the model. The results indicate that as the crack width and depth increase， the accumulation of surface chloride in concrete accelerates， thereby enhancing chloride transport. Compared with existing models， the proposed theoretical model improves prediction accuracy by 30%.