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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...

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Main Author: Abdul Rahman, Junita
Format: Thesis
Language:English
English
English
Published: 2021
Subjects:
TA703-712 Engineering geology. Rock mechanics. Soil mechanics.
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spelling my.uthm.eprints.40032022-02-03T02:18:55Z http://eprints.uthm.edu.my/4003/ Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes 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 NonPeerReviewed text en http://eprints.uthm.edu.my/4003/1/24p%20JUNITA%20ABD%20RAHMAN.pdf text en http://eprints.uthm.edu.my/4003/2/JUNITA%20ABD%20RAHMAN%20COPYRIGHT%20DECLARATION.pdf text en http://eprints.uthm.edu.my/4003/3/JUNITA%20ABD%20RAHMAN%20WATERMARK.pdf Abdul Rahman, Junita (2021) Chemical and biological reactions of solidification of peat using ordinary portland cement (OPC) and coal ashes. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
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
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
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
http://eprints.uthm.edu.my/4003/
_version_ 1738581194801414144
score 13.211869

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