受冻融混凝土表面处理后的暴露试验研究

摘要

Frozen-thawed concrete specimens were surface impregnated with silane gel. Exposure test on chlo-ride penetration resistance and carbonation resistance was carried out. Then the protective mechanism was ana-lyzed. Results indicate that surface treatment can obviously improve chloride penetration resistance. But the treat-ment has different effect on carbonation resistance of frozen-thawed concrete influenced by the frost damage and the climate. Lastly, the corrected model of carbonation is put forward based on test results.%采用硅烷凝胶对受冻融混凝土进行表面处理，通过室外暴露试验研究受冻融混凝土表面处理后的的抗氯离子侵蚀和抗碳化性能，并对防护机理进行分析。结果表明：表面处理能明显提高受冻融混凝土抗氯离子侵蚀能力，其效果与混凝土冻融损伤程度、渗透型涂料用量有关；由于受到混凝土冻融损伤程度和环境气候的影响，受冻融混凝土的抗碳化性能有所差异。基于试验结果，引入渗透型涂料影响系数δs 与冻融损伤因子ω对碳化模型进行了修正。