浇筑参数对混凝土介电性能影响的试验研究  

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

作　　者：周道传[1] 朱海堂[2] 张启明[2] 孙丽萍[2] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]郑州大学环境与水利学院,河南郑州450002

出　　处：《建筑材料学报》2009年第4期470-472,477,共4页Journal of Building Materials

基　　金：河南省重点科技攻关项目(0423034100)

摘　　要：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.Evaluation of dielectric properties of concrete by experimental study with use of 1.0GHz ground-penetrating radar and software Radan was conducted. Dielectric properties of concrete were charac-terized 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 volume, the maximum aggregate size and strength level. Non-destructive tests were carried out in different ages. Influence of the design parameters on the relative dielectric constant was studied. Dielectric properties of concrete are affected by unit water consumption, concrete strength and age except the maximum aggregate size. The influence of unit water consumption on dielectric properties is much greater than concrete strength and age. Relative dielectric constant increases with unit water consumption, decreases with age. Calculation method of the relative dielectric constant of concrete is put forward through regression analysis, which is verified by calculation of protective layer thickness of steel bars in concrete. Verifi-cation shows that the method is reliable in calculating concrete relative dielectric constant.

关 键 词：混凝土 介电性能 相对介电常数 浇筑参数 

分 类 号：TU528.01[建筑科学—建筑技术科学]