Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses

Soil is used as bedding or support for all types of heavy structures, including roads, highways, and structural foundations. The strength parameter, California Bearing Ratio (CBR) is a vital consideration during the design stage of pavement and other superstructure. Moisture content in soil also pla...

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Main Author:	Rahman, Mohammad Mosiour
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/78820/1/MohammadMosiourRahmanMFKA2017.pdf
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spelling	my-utm-ep.788202018-09-17T04:20:49Z Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses 2017-08 Rahman, Mohammad Mosiour TA Engineering (General). Civil engineering (General) Soil is used as bedding or support for all types of heavy structures, including roads, highways, and structural foundations. The strength parameter, California Bearing Ratio (CBR) is a vital consideration during the design stage of pavement and other superstructure. Moisture content in soil also plays an important role for values of CBR. In conventional methods, soil samples are taken from the field to the laboratory and moisture content is determined by standard oven drying method. These methods are laborious, time-consuming, and require excessive care and accuracy. In the presence of water, the soil shows strong dielectric performance. Microwave frequency can exploit the large contrast between the dielectric constant of free water and soil. The dielectric constant of the soil is directly correlated to soil moisture content. The dielectric constant of the soil varies with proportion of water substrate present in it. This research focused on using microwave techniques by considering frequency domain to determine moisture content of subgrade and subbase. Three samples were tested in this research: soil subgrade, sand subbase and blended subbase. Several laboratory tests such as determination of moisture content by conventional method, grain size analysis and Modified Proctor test were performed. The dielectric data measurements were taken for the three samples at operating frequency range from 1 MHz to 20 GHz. The values of dielectric constant, loss factor and conductivity of the samples were determined independently. The relation between dielectric constant, E'r and moisture content was established in polynomial formulation in this research. The dielectric constant of soil subgrade rose rapidly with the increase of moisture content. However for sand subbase, the dielectric constant rose slowly with the increase of moisture content. The conductivity of soil sample increased more rapidly with moisture changes than sand sample. It was observed that the soil sample was highly conductive while the sand sample had poor conductivity. This study was the first of its kind to apply microwave techniques for considering frequency domain in determining moisture content of pavement layers. 2017-08 Thesis http://eprints.utm.my/id/eprint/78820/ http://eprints.utm.my/id/eprint/78820/1/MohammadMosiourRahmanMFKA2017.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:109892 phd doctoral Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Rahman, Mohammad Mosiour Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
description	Soil is used as bedding or support for all types of heavy structures, including roads, highways, and structural foundations. The strength parameter, California Bearing Ratio (CBR) is a vital consideration during the design stage of pavement and other superstructure. Moisture content in soil also plays an important role for values of CBR. In conventional methods, soil samples are taken from the field to the laboratory and moisture content is determined by standard oven drying method. These methods are laborious, time-consuming, and require excessive care and accuracy. In the presence of water, the soil shows strong dielectric performance. Microwave frequency can exploit the large contrast between the dielectric constant of free water and soil. The dielectric constant of the soil is directly correlated to soil moisture content. The dielectric constant of the soil varies with proportion of water substrate present in it. This research focused on using microwave techniques by considering frequency domain to determine moisture content of subgrade and subbase. Three samples were tested in this research: soil subgrade, sand subbase and blended subbase. Several laboratory tests such as determination of moisture content by conventional method, grain size analysis and Modified Proctor test were performed. The dielectric data measurements were taken for the three samples at operating frequency range from 1 MHz to 20 GHz. The values of dielectric constant, loss factor and conductivity of the samples were determined independently. The relation between dielectric constant, E'r and moisture content was established in polynomial formulation in this research. The dielectric constant of soil subgrade rose rapidly with the increase of moisture content. However for sand subbase, the dielectric constant rose slowly with the increase of moisture content. The conductivity of soil sample increased more rapidly with moisture changes than sand sample. It was observed that the soil sample was highly conductive while the sand sample had poor conductivity. This study was the first of its kind to apply microwave techniques for considering frequency domain in determining moisture content of pavement layers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Rahman, Mohammad Mosiour
author_facet	Rahman, Mohammad Mosiour
author_sort	Rahman, Mohammad Mosiour
title	Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
title_short	Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
title_full	Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
title_fullStr	Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
title_full_unstemmed	Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
title_sort	relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/78820/1/MohammadMosiourRahmanMFKA2017.pdf
_version_	1747818079273877504

Relationships between moisture content and dielectric constant for subgrade and subbase of pavement courses

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