Characterization of concrete properties from dielectric properties using ground penetrating radar

被引：89
作者：
Lai, W. L. [1 ]
Kou, S. C. [1 ]
Tsang, W. F. [2 ]
Poon, C. S. [1 ]
机构：
[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Dept Bldg & Real Estate, Kowloon, Hong Kong, Peoples R China
来源：
CEMENT AND CONCRETE RESEARCH | 2009年 / 39卷 / 08期
关键词：
Lightweight and normal aggregate concrete; Ground penetrating radar; Real permittivity; Wave energy level; Free water; Absorbed/bound water; MICROWAVE; SOILS; GPR; MOISTURE;
D O I：
10.1016/j.cemconres.2009.05.004
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper presents the experimental results of a study of the relationships between light-weight (LWAC) and normal aggregate concrete (NAC) properties, as well as radar wave properties that are derived by using ground penetrating radar (GPR). The former (LWAC) refers to compressive strength, apparent porosity and saturated density, while the latter (NAC) refers to real part of dielectric permittivity (epsilon' or real permittivity) and wave energy level (E). Throughout the test period of the newly cast concrete cured for 90 days, the above mentioned material properties gradually changed which can be attributed to the effects of cement hydration, different types of aggregates and initial water to binder ratios. A number of plots describing various properties of concrete such as dielectric, strength and porosity perspectives were established. From these plots, we compare the characteristics of how much and how fast free water was turned to absorbed water in LWAC and NAC. The underlying mechanisms and a mechanistic model are then developed. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：687 / 695
页数：9
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