Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes

Construction over peat area have often posed a challenge to geotechnical engineers. After decades of study on peat stabilisation techniques, there are still no absolute formulation or guideline that have been established to handle this issue. Some researchers have proposed solidification of pe...

Full description

Saved in:

Bibliographic Details
Main Author:	Abdul Rahman, Junita
Format:	Thesis
Language:	English English English
Published:	2021
Subjects:	TA703-712 Engineering geology Rock mechanics Soil mechanics.
Online Access:	http://eprints.uthm.edu.my/4003/1/24p%20JUNITA%20ABD%20RAHMAN.pdf http://eprints.uthm.edu.my/4003/2/JUNITA%20ABD%20RAHMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/4003/3/JUNITA%20ABD%20RAHMAN%20WATERMARK.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uthm-ep.4003
record_format	uketd_dc
spelling	my-uthm-ep.40032022-02-03T02:18:55Z Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes 2021-08 Abdul Rahman, Junita TA703-712 Engineering geology. Rock mechanics. Soil mechanics. Construction over peat area have often posed a challenge to geotechnical engineers. After decades of study on peat stabilisation techniques, there are still no absolute formulation or guideline that have been established to handle this issue. Some researchers have proposed solidification of peat but a few researchers have also discovered that solidified peat seemed to decrease its strength after a certain period of time. Therefore, understanding the chemical and biological reaction behind the peat solidification is vital to understand the limitation of this treatment technique. In this study, all three types of peat; fabric, hemic and sapric were mixed using Mixing 1 and Mixing 2 formulation which consisted of ordinary Portland cement, fly ash and bottom ash at various ratio. The mixtures of peat-binder-filler were subjected to the unconfined compressive strength (UCS) test, bacterial count test and chemical elemental analysis by using XRF, XRD, FTIR and EDS. Two pattern of strength over curing period were observed. Mixing 1 samples showed a steadily increase in strength over curing period until Day 56 while Mixing 2 showed a decrease in strength pattern at Day 28 and Day 56. Samples which increase in strength steadily have less bacterial count and enzymatic activity with increase quantity of crystallites. Samples with lower strength recorded increase in bacterial count and enzymatic activity with less crystallites. Analysis using XRD showed that pargasite (NaCa2[Mg4Al](Si6Al2)O22(OH)2) was formed in the higher strength samples while in the lower strength samples, pargasite was predicted to be converted into monosodium phosphate and Mg(OH)2 as bacterial consortium was re-activated. The Michaelis�Menten coefficient, Km of the bio-chemical reaction in solidified peat was calculated as 303.60. This showed that reaction which happened during solidification work was inefficient. The kinetics for crystallite formation with enzymatic effect is modelled as 135.42 (1/[S] + 0.44605) which means, when pargasite formed is lower, the amount of enzyme secretes is higher. 2021-08 Thesis http://eprints.uthm.edu.my/4003/ http://eprints.uthm.edu.my/4003/1/24p%20JUNITA%20ABD%20RAHMAN.pdf text en public http://eprints.uthm.edu.my/4003/2/JUNITA%20ABD%20RAHMAN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/4003/3/JUNITA%20ABD%20RAHMAN%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Awam dan Alam Bina
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA703-712 Engineering geology Rock mechanics Soil mechanics.
spellingShingle	TA703-712 Engineering geology Rock mechanics Soil mechanics. Abdul Rahman, Junita Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
description	Construction over peat area have often posed a challenge to geotechnical engineers. After decades of study on peat stabilisation techniques, there are still no absolute formulation or guideline that have been established to handle this issue. Some researchers have proposed solidification of peat but a few researchers have also discovered that solidified peat seemed to decrease its strength after a certain period of time. Therefore, understanding the chemical and biological reaction behind the peat solidification is vital to understand the limitation of this treatment technique. In this study, all three types of peat; fabric, hemic and sapric were mixed using Mixing 1 and Mixing 2 formulation which consisted of ordinary Portland cement, fly ash and bottom ash at various ratio. The mixtures of peat-binder-filler were subjected to the unconfined compressive strength (UCS) test, bacterial count test and chemical elemental analysis by using XRF, XRD, FTIR and EDS. Two pattern of strength over curing period were observed. Mixing 1 samples showed a steadily increase in strength over curing period until Day 56 while Mixing 2 showed a decrease in strength pattern at Day 28 and Day 56. Samples which increase in strength steadily have less bacterial count and enzymatic activity with increase quantity of crystallites. Samples with lower strength recorded increase in bacterial count and enzymatic activity with less crystallites. Analysis using XRD showed that pargasite (NaCa2[Mg4Al](Si6Al2)O22(OH)2) was formed in the higher strength samples while in the lower strength samples, pargasite was predicted to be converted into monosodium phosphate and Mg(OH)2 as bacterial consortium was re-activated. The Michaelis�Menten coefficient, Km of the bio-chemical reaction in solidified peat was calculated as 303.60. This showed that reaction which happened during solidification work was inefficient. The kinetics for crystallite formation with enzymatic effect is modelled as 135.42 (1/[S] + 0.44605) which means, when pargasite formed is lower, the amount of enzyme secretes is higher.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdul Rahman, Junita
author_facet	Abdul Rahman, Junita
author_sort	Abdul Rahman, Junita
title	Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
title_short	Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
title_full	Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
title_fullStr	Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
title_full_unstemmed	Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes
title_sort	chemical and biological reactions of solidification of peat using ordinary portland cement (opc) and coal ashes
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Awam dan Alam Bina
publishDate	2021
url	http://eprints.uthm.edu.my/4003/1/24p%20JUNITA%20ABD%20RAHMAN.pdf http://eprints.uthm.edu.my/4003/2/JUNITA%20ABD%20RAHMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/4003/3/JUNITA%20ABD%20RAHMAN%20WATERMARK.pdf
_version_	1747831047972716544

Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes

Similar Items