腐蚀疲劳作用下道路混凝土性能影响因素分析及预测

Analysis and Prediction of Performance of Concrete Under Corrosion Fatigue

以室内疲劳荷载与硫酸盐腐蚀作用下混凝土抗弯拉强度劣化试验结果为依据,应用灰色理论分析配合比设计参数(水灰比)、应力水平、硫酸盐浓度等内外部因素对混凝土性能的影响,分析了疲劳荷载与硫酸盐侵蚀环境下混凝土的性能劣化规律并通过建立多元灰预测模型。分析结果表明:对道路混凝土耐腐蚀疲劳影响最大的是水灰比,其次为疲劳荷载和硫酸盐浓度。道路高性能混凝土配合比设计中,应主要采用优化道路混凝土材料组成的方法改善水泥混凝土抗疲劳荷载-硫酸腐蚀能力。建立的GM(1,3)灰色预测模型,能够较好地预测水泥混凝土耐腐蚀疲劳性能。

According to the experimental data of concrete under sulfate corrosion and fatigue, the effects of watecement ratio, stress level and sulfate concentration on the properties of cement concrete model were analyzed by using the grey theory,the durability degradation rule of cement concrete under sulfate corrosion and fatigue was studied, and the multi-element grey predict model GM（1, N）was established. The experimental results show that water cement ratio has the largest impact on anti-corrosion fatigue property of concrete,secondly is stress level and the effect of sulfate concentra- tion is the smallest. The durability of cement concrete under sulfate corrosion and fatigue can be predicted by GM（1,3） model.