硫酸铵腐蚀环境下的混凝土碳化深度试验研究与应用

硫酸盐腐蚀是影响混凝土结构耐久性能的重要化学劣化因子之一。以赣南离子型稀土开采残留硫酸铵的环境问题为背景,通过实验室快速碳化试验研究硫酸铵溶液浓度对混凝土碳化深度的影响规律。结果表明:硫酸铵溶液浓度越大,相同强度等级的混凝土在相同碳化龄期的碳化深度与碳化速率越大。根据试验结果建立了硫酸铵腐蚀环境下混凝土碳化深度预测模型,对该环境下混凝土最小保护层厚度取值提出了建议。

Experimental Study and Application of Concrete Carbonation Depth Under the Ammonium Sulfate Corrosion Environment

Sulfate corrosion is one of the important chemical deterioration factors that influence the durability of concrete. Based on the environmental pollution of the residual ammonium sulfate resulted from mining rare earth in southern Jiangxi, the effect of the concentration ammonium sulfate solution on the concrete carbonation depth was studied by laboratory rapid carbonation test. The results show that the higher the concentration, the greater the carbonation depth and the carbonation rate of concrete with the same grade at the same carbonation age. According to the test, the prediction model of the concrete carbonation depth under the ammonium sulfate corrosion environment is established, and the value of the minimum thickness of concrete cover is suggested.