水泥混凝土介电模型研究

Dielectric Model of Cement Concrete

水泥混凝土的介电常数模型的建立是应用电磁波技术对混凝土结构进行质量检测和内部损伤探测的前提和关键。为分析研究水泥混凝土的介电常数模型,在对比分析线性模型、均方根模型和Rayleigh模型的基础上,针对水泥混凝土的特点,引入了一种新介电常数模型,采用网络分析仪,对采用连续级配两种水泥标号三种不同水灰比制作而成的水泥混凝土试件进行了28 d龄期后的介电常数测量,以验证所推荐模型的精确性和适用性。结果表明:与线性模型、均方根模型和Rayleigh模型相比,所推荐模型计算精度高,适于描述28 d龄期后水泥混凝土的介电特性。

The establishment of cement concrete dielectric constant model is the basic and key technique for applying the electromagnetic wave technology to concrete structure quality testing and internal damage detection.Based on the characteristics of the cement concrete,a new dielectric constant model is imported after the linear model, the root-mean-square model and Rayleigh model are analyzed comprehensively.Dielectric constants of cement concrete are tested by using network analyzer and the new dielectric model is verified in experiment.The experimental results show the suggested model has higher precision than that of the linear model,the root-mean-square model and the Rayleigh model and is suitable for describing the cement concrete dielectric properties.