EFFECT OF MOISTURE ON ASPHALTIC CONCRETE AT MICROWAVE-FREQUENCIES

被引：37

作者：

ALQADI, IL

GHODGAONKAR, DK

VARADAN, VK

VARADAN, VV

机构：

[1] PENN STATE UNIV,DEPT ENGN SCI & MECH,UNIVERSITY PK,PA 16802

[2] PENN STATE UNIV,CTR ENGN ELECTR & ACOUST MAT,UNIVERSITY PK,PA 16802

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1991年 / 29卷 / 05期

关键词：

D O I：

10.1109/TGRS.1991.817705

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A contactless measurement setup measures the magnitude and phase of reflection coefficients of metal-backed asphaltic concrete specimens in the frequency range of 12.4-18.0 GHz. A vector network analyzer, spot-focusing horn lens antenna, mode transitions, and coaxial cables measure free-space complex reflection coefficients. The complex permittivity is calculated from the measured reflection coefficient of metal-backed asphaltic concrete specimens, by an iterative procedure that minimizes an error function. A significant difference exists between the dielectric properties of the dry and wet specimens. Therefore, the presence of moisture can be detected. The moisture content of wet specimens is deduced from the complex permittivities of dry and wet specimens using the effective medium approximation for asphaltic concrete mixtures. The results include the moisture content and dielectric properties of asphaltic concrete specimens at different air void contents.

引用

页码：710 / 717

页数：8

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