浇筑参数对混凝土介电性能影响的试验研究

在常温条件下,设计制作了3种浇筑参数(包括混凝土单位体积用水量、骨料最大粒径及混凝土强度等级)的混凝土试件;在不同龄期下,应用地质雷达对混凝土试件进行无损检测,研究了各种参数对混凝土材料介电性能的影响.结果表明:单位体积用水量、强度等级和龄期对混凝土介电性能影响较大,其中,单位体积用水量对混凝土介电性能的影响远大于抗压强度和龄期的影响,而且,混凝土材料的相对介电常数随着单位体积用水量的增加而变大,随着龄期的增长而减小;骨料最大粒径对混凝土介电性能几乎无影响.通过回归分析得到了混凝土材料相对介电常数的计算式,并对混凝土中钢筋保护层厚度的计算进行了验证,发现计算误差较小,说明所提出的计算方法可靠.

Experimental Study of Influence of Pouring Parameters on Dielectric Properties of Concrete

Evaluation of dielectric properties of concrete by experimental study with use of 1.0 GHz ground-penetrating radar and software Radan was conducted.Dielectric properties of concrete were characterized by relative dielectric constant.A parametric study was performed to better understand the influence of pouring parameters on the relative dielectric constant.Concrete test samples with three different pouring parameters were made under room temperature;the design parameters were water consumption per unit volu...