Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud

One of the reasons of pavement failure is weak subgrade, which causes rutting, alligator cracking, and upheaval. To prevent sub grade failure, adequate compaction as in the specification must be carried out. Proper quality assurance and quality compliance (QA/QC) procedure must be followed to ensure...

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Main Author:	Mat Daud, Norasmah Laili
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships
Online Access:	https://ir.uitm.edu.my/id/eprint/14106/1/TM_NORASMAH%20LAILI%20MAT%20DAUD%20EC%2014_5.pdf
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spelling	my-uitm-ir.141062022-03-11T07:46:12Z Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud 2014 Mat Daud, Norasmah Laili Soils. Soil science. Including soil surveys, soil chemistry, soil structure, soil-plant relationships Soil mechanics. Including properties of soils, water in soil, strength properties, consolidation, etc. TC Hydraulic engineering. Ocean engineering One of the reasons of pavement failure is weak subgrade, which causes rutting, alligator cracking, and upheaval. To prevent sub grade failure, adequate compaction as in the specification must be carried out. Proper quality assurance and quality compliance (QA/QC) procedure must be followed to ensure that compaction is carried out adequately. Existing Public Work Department (PWD) Specification for Road Work (JKR7SPJ/88) relating to compaction only require in-situ field density test and moisture content to ensure that compaction is carried out correctly. There is no specification on the determination of subgrade strength although the strength of subgrade in terms of elastic modulus is important as input in pavement design. Therefore, there is a need to obtain the in-situ subgrade strength to ensure that the pavement is correctly designed. This research details a study on road subgrade using three types of in-situ devices undertaken on six 150-metres length flexible pavement subgrade test sections. The devices used in this study include the in-situ CBR, Dynamic Cone Penetrometer (DC?) and Portable Falling Weight Deflectometer (PFWD). Tests using these devices were carried out at specified spacing on the test sections to determine the subgrade CBR, DCP-PR in (mm/blow) and elastic modulus values. The results obtained for laboratory CBR (unsoaked and soaked), in-situ CBR, DCP-PR in (mm/blow) and modulus subgrade were analysed and correlated to develop models to relate the values obtained. It was found that there is a reasonable relationship between the in-situ CBR and the laboratory unsoaked CBR values. The relationship between in-situ CBR with the DCP-PR in (mm/blow) values was found to be conclusive as high positive values of correlation were obtained. The relationship between in-situ CBR with the P-FWD modulus values was found to be inconclusive. The relationship obtained between DCP and P-FWD is a positive correlation. It is recommended that DCP test be included in all PWD road construction specification so that the subgrade strength of the pavement could be checked to meet the desired requirement. 2014 Thesis https://ir.uitm.edu.my/id/eprint/14106/ https://ir.uitm.edu.my/id/eprint/14106/1/TM_NORASMAH%20LAILI%20MAT%20DAUD%20EC%2014_5.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Civil Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships
spellingShingle	Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships Soils Soil science Including soil surveys, soil chemistry, soil structure, soil-plant relationships Mat Daud, Norasmah Laili Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
description	One of the reasons of pavement failure is weak subgrade, which causes rutting, alligator cracking, and upheaval. To prevent sub grade failure, adequate compaction as in the specification must be carried out. Proper quality assurance and quality compliance (QA/QC) procedure must be followed to ensure that compaction is carried out adequately. Existing Public Work Department (PWD) Specification for Road Work (JKR7SPJ/88) relating to compaction only require in-situ field density test and moisture content to ensure that compaction is carried out correctly. There is no specification on the determination of subgrade strength although the strength of subgrade in terms of elastic modulus is important as input in pavement design. Therefore, there is a need to obtain the in-situ subgrade strength to ensure that the pavement is correctly designed. This research details a study on road subgrade using three types of in-situ devices undertaken on six 150-metres length flexible pavement subgrade test sections. The devices used in this study include the in-situ CBR, Dynamic Cone Penetrometer (DC?) and Portable Falling Weight Deflectometer (PFWD). Tests using these devices were carried out at specified spacing on the test sections to determine the subgrade CBR, DCP-PR in (mm/blow) and elastic modulus values. The results obtained for laboratory CBR (unsoaked and soaked), in-situ CBR, DCP-PR in (mm/blow) and modulus subgrade were analysed and correlated to develop models to relate the values obtained. It was found that there is a reasonable relationship between the in-situ CBR and the laboratory unsoaked CBR values. The relationship between in-situ CBR with the DCP-PR in (mm/blow) values was found to be conclusive as high positive values of correlation were obtained. The relationship between in-situ CBR with the P-FWD modulus values was found to be inconclusive. The relationship obtained between DCP and P-FWD is a positive correlation. It is recommended that DCP test be included in all PWD road construction specification so that the subgrade strength of the pavement could be checked to meet the desired requirement.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mat Daud, Norasmah Laili
author_facet	Mat Daud, Norasmah Laili
author_sort	Mat Daud, Norasmah Laili
title	Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
title_short	Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
title_full	Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
title_fullStr	Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
title_full_unstemmed	Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud
title_sort	evaluation of subgrade soils using selected in-situ devices / norasmah laili mat daud
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Civil Engineering
publishDate	2014
url	https://ir.uitm.edu.my/id/eprint/14106/1/TM_NORASMAH%20LAILI%20MAT%20DAUD%20EC%2014_5.pdf
_version_	1783733214753325056

Evaluation of subgrade soils using selected in-situ devices / Norasmah Laili Mat Daud

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