Peat Stabilization using Gypsum and Fly Ash

Kolay, Prabir K.; Pui, M P

doi:10.33736/jcest.75.2010

Cited by 25 publications

(10 citation statements)

References 10 publications

(7 reference statements)

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“…POFA alone mixed with kaolin absorbed much water and showed higher liquid limit in samples K5P, K10P and K15P. One reason for the increment may be the high amount of fiber in POFA, which absorbs a significant amount of water, or it might be the increase in CaO content in POFA and gypsum, which usually absorb more water; these results agree with those of [10,37]. Another reason for the increment in the liquid limit might be due to an elongation of the diffuse double layer as a result of the increment in the specific surface area, which assisted in the soft soil's capacity to hold more water; the results showed agreement with soft clay treated with high calcium fly ash investigated by [61].…”

Section: Natural Water Content and Specific Gravitysupporting

confidence: 82%

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Improving the Early Properties of Treated Soft Kaolin Clay with Palm Oil Fuel Ash and Gypsum

et al. 2021

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Soft soil problems and increased production of fuel waste have emerged due to world population growth. These two problems are prompting engineers to introduce new methods of using waste fuel to stabilize the soil. Previous research has shown clear sustained improvements in soil properties using palm oil fuel ash (POFA) when mixed with a calcium-based binder such as NaCl, lime or cement. The use of such a stabilizing agent can reduce the economic problems associated with reducing the cost of waste disposal and create a sustainable ecological system. It is an alternative method of replacing part of the soil to ensure a balance between economic growth and ecological privilege, leading to the achievement of green technology goals. However, this research is aimed at improving the properties of processed soft kaolin clay with a combination of POFA and gypsum. The physical and mechanical properties of all samples were tested. The results showed a decrease in the specific gravity with the addition of POFA and an increase with gypsum alone, as well as a decrease with a mixture of POFA and gypsum and a decrease in the soil plasticity index due to a better increase in the plasticity limit compared to the liquid limit. This is considered a sign of improved geotechnical properties and reduced linear shrinkage. It was also shown that the treated clay showed an increase in the optimal water content and a drop in the maximum dry density. Nevertheless, it can be concluded that the initial properties of the processed soft kaolin clay with the addition of POFA can be significantly improved.

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Section: Natural Water Content and Specific Gravitysupporting

confidence: 82%

“…The optimum moisture content and maximum dry density at 4% gypsum are 11.76% and 19.16 KN/m 3 , respectively. It is stated that the unconfined compressive strength increased with the addition of percentages of gypsum to the soft soil, but the UCS values reduced after 6% of gypsum [37].…”

Section: Introductionmentioning

confidence: 99%

Improving the Early Properties of Treated Soft Kaolin Clay with Palm Oil Fuel Ash and Gypsum

et al. 2021

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“…S2 in supplementary material) in our experiment are therefore unexpected. Peat soils have very different physical properties than mineral soils (Schwärzel et al 2002;Sognnes et al 2006) and the addition of gypsum (CaSO 4 ) has been found to increase peat physical stability (Kolay and Pui 2010;Saberian and Rahgozar 2016). In our experiment, this effect may possibly have resulted in modified soil physical properties with higher penetration resistance negatively influencing grass growth.…”

Section: Effects Of Treatments On Grass N Yieldmentioning

confidence: 99%

Effects of Ca:Mg ratio and pH on soil chemical, physical and microbiological properties and grass N yield in drained peat soil

Deru

Hoekstra

Agtmaal

et al. 2021

New Zealand Journal of Agricultural Research

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In three dairy grasslands on peat, minerals were added to manipulate the soil Ca:Mg ratio with or without effect on pH. The responses of soil properties and grass N yield were measured. CaCO 3 application led to higher soil Ca:Mg ratio and pH KCl compared to the untreated control, decreased N total and C total , and increased P availability. Grass N yield increased in the first year by only 6% of the reduction in soil N total , but not in the second year. A higher pH increased SOM decomposition, especially in soils with high P availability. MgCO 3 reduced the Ca: Mg ratio, had little influence on soil parameters and no effect on grass N yield. In contrast, CaSO 4 and MgSO 4 did not influence pH KCl but reduced grass N yield in most cases. Results suggest stabilisation of organic matter by Ca binding in treatments with added Ca. We conclude that grass N yield was not linked with changes in Ca:Mg ratio but with soil pH. The pH effects on SOM decomposition depended on P availability and Ca binding. Hence, to avoid potentially large soil losses of C and N, the current agricultural advice on pH management in peat grasslands should be better adapted to local edaphic characteristics.

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“…They found that the unconfined compressive strength (UCS) improved when increasing amounts of carbide lime were added to peat soil. On the other hand, Kolay and Pui [ 15 ] utilized fly ash and gypsum to stabilize peat soil, and reported that the use of fly ash gave better UCS results than gypsum. Pond ash [ 6 ], sodium bentonite [ 16 ] and clayey diatomite [ 5 ] were also used to stabilize peat soil.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Strength Performance of Peat Soil: A Modified Cement-Based Stabilization Agent Using Fly Ash and Polypropylene Fiber

et al. 2021

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The use of cement as a soil stabilization agent is one of the common solutions to enhancing the engineering properties of soil. However, the impact and cost of using cement have raised environmental concerns, generating much interest in the search for alternative materials to reduce the use of cement as a stabilizing agent in soil treatment. This study looked into limiting cement content in peat soil stabilization by using fly ash waste and polypropylene fiber (PPF). It focused on soil mechanical mediation for stabilization of peat with fly ash cement and PPF cement by comparing the mechanical properties, using unconfined compressive strength (UCS) and California bearing ratio (CBR) tests. The control (untreated) peat specimen and specimens with either fly ash (10%, 20% and 30%) and PPF (0.1%, 0.15% and 0.2%) were studied. Test results showed that 30% of fly ash and cement content displays the highest UCS and CBR values and gives the most reliable compressibility properties. On the other hand, UCS and CBR test results indicate optimum values of PPF–cement stabilizing agent content in the specimen of 0.15% PPF and 30% cement. Selected specimens were analyzed using scanning electron microscopy (SEM), and PPF threads were found to be well surrounded by cement-stabilized peat matrices. It was also observed that the specimen with 30% fly ash generated more hydration products when compared to the specimen with 100% cement content. It is concluded that the use of fly ash cement and PPF cement as stabilizing agents to limit the cement usage in peat soil treatment is potentially viable.

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Peat Stabilization using Gypsum and Fly Ash

Cited by 25 publications

References 10 publications

Improving the Early Properties of Treated Soft Kaolin Clay with Palm Oil Fuel Ash and Gypsum

Improving the Early Properties of Treated Soft Kaolin Clay with Palm Oil Fuel Ash and Gypsum

Effects of Ca:Mg ratio and pH on soil chemical, physical and microbiological properties and grass N yield in drained peat soil

A Study of the Strength Performance of Peat Soil: A Modified Cement-Based Stabilization Agent Using Fly Ash and Polypropylene Fiber

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