Dielectric Dispersion Characteristics of Unsaturated Sand Contaminated by Diesel

Abstract

Generally the methods were used to characterize soil contamination include collecting samples of soil then analyzing them to recognize contaminates in the laboratory. Commonly, this method of characterizing the contamination of a soil system is the only one agreeable to regulatory societies. However, sample analysis in the lab faces important problems such as soils sampling is really time consuming and costly, sampling is not constant with time and the samples be able to contaminate through sampling and carrying to the lab. Thus several geophysical techniques have been developed which used the dissimilarity in the soil physical properties after soil contamination. Dielectric technique shows high conceivable for characterization diesel contaminated soil. Further use of this technique; rely upon the availability of information about the dielectric properties of the contaminated soil. In this study, the effects of induced by a diesel presence in an unsaturated soil, on the complex dielectric properties were sought. It has been shown experimentally that the diesel presence in an unsaturated soil is traduced by an increase of both dielectric constant and loss factor. A comparison with the existing results in this study and in the literature for saturated soils shows an opposite effect on the complex dielectric properties. The importance of the influence induced by the diesel on the dielectric properties of an unsaturated soil was noticed and compared to a saturated soil. On the basis of the theoretical dielectric mixture models, a justification to these opposite behaviors and their importance has been presented and various models for the two cases have been developed.

Comparison of Nondestructive Testing Method for Strength Prediction of Asphalt Concrete Material

“…These two techniques could be used to measure the dielectric properties of concrete. The detail description of the dielectric methods could be found in previous published work [35][36][37][38][39][40]. The dielectric methods used in this study is given in Figure 3.…”

Determination of leachate pollution content in soil using in-situ dielectric measurement

“…1. The detail explanation of the sensor was explained in previous work [17]. The successful use of lab dielectric sensor for characterization leachate contaminated soil leads to develop a new dielectric sensor which can be used for in-situ testing.…”

“…LCR meter connected through coaxial cable and fixture to two electrodes to excite soil in contact with the electrodes by an electromagnetic signal. The measured impedance or admittance of the soil will be used to calculate the dielectric properties of soil [17].…”

“…Several researchers evaluate the dielectric dispersion characteristics of sand contaminated by heavy metal, [16] diesel, and petroleum hydrocarbon [17]. This paper will investigate the use of dielectric properties of soil material to determine soil leachate contamination.…”

“…Therefore, Dielectric method proposed in this study could provide an online monitoring system and could be an early warning system. In addition, this method is unique in saving cost, time and intensive testing [16][17][18][19][20].…”