韦水倒虹工程混凝土碳化深度预测研究

为了比较基于抗压强度的混凝土碳化深度预测模型的适应性和准确性,在分析预测模型基础上,根据韦水倒虹工程现场环境的温度、湿度、CO2浓度及现场检测的芯样强度资料对混凝土碳化深度进行了预测,并与该工程实测碳化深度进行了比较.结果表明:牛荻涛等的预测模型对于强度等级较低的混凝土预测较准确,邸小坛等的预测模型对于强度等级较高的混凝土预测较符合实际,而Smolczyk预测模型的预测值明显比实测值大;认为建立碳化深度与实际龄期混凝土抗压强度的关系模型比建立碳化深度与混凝土28d龄期抗压强度的关系模型更有意义.

Study on prediction of concrete carbonation depth of Weishui inverted siphon project

For comparison of the adaptability and accuracy of the compressive strength-based forecasting models of concrete carbonation depth, the models were adopted to forecast the concrete carbonation depth for the Weishui project according to the field data of temperature, humidity, and density of CO2 of the project and the strength of concrete core samples from field detection. The comparison of forecast results with measured data shows that the forecasting model, presented by NIU Di-tao, et al, is accurate in forecasting for low-strength concrete, that the forecasting model, presented by DI Xiao-tan, et al,well accords with the reality in forecasting for high-strength concrete, while the forecast result of the Smolczyk model is obviously larger than the measured data.Moreover,it is considered that to establish a model for the relationship between the carbonation depth and age-dependent compressive strength of concrete is of great significance as compared to develop a model for the relationship between the carbonation depth and the compressive strength of concrete at 28?d.