Physical and Chemical Properties of Coal Bottom Ash (CBA) from Tanjung Bin Power Plant

Huge quantities of fly ash and bottom ash are generated from thermal power plants and it presents great concern for country, mainly due to the environmental effects. In this study, fly ashes and bottom ash were characterized from technical and radiological aspects. Health effect due to the activity of radionuclides 226Ra, 232Th and 40K was estimated via radium equivalent activity (Raeq), external hazards index (Hex), the external absorbed dose rate (D) and annual effective dose rate (EDR). The specific surface area (40.25 m2 g−1), particle density (1.88 g cm−3) and LOI (23.49%) were typical for bottom ash. Siliceous fly ash contained 32% reactive silica. The annual effective dose rate for all ashes is ≤ 0.2 mSv y−1. Both, fly ash and bottom ash present potential secondary raw materials to be used for building purposes as result of their technological and radiological assessment.

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“…), but with greater content of unburned carbon. Fly ash particles are spherical and alkaline in nature [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Fidanchevski

Angjusheva

Jovanov

et al. 2021

J Radioanal Nucl Chem

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“…Coal bottom ash (CBA) is the by-product of the pulverized coal in power plants. It has large particle size and porous in nature [6] as shown in Figure 1. Its application in the field of civil engineering has the great environmental advantages, which are noteworthy in the sustainability of natural resources [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Mangi

Ibrahim

Jamaluddin

et al. 2019

J. Eng. Technol. Sci.

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The grinding process is necessary to convert original coal bottom ash (CBA) into a powder form. The aim of this study is to evaluate the grinding process effects on physical properties of CBA, it influences on consistency and setting time of cement paste and to predict it potentiality based on chemical characteristics to reduce the alkali-silica reaction (ASR) in concrete. The CBA is the by-product of coal based thermal power plant. Due to high production of electricity in Malaysia, the excess amount of CBA has been produced annually and it causes the environmental problems. Therefore, it is necessary to come up with advanced solutions for that pollution. This study considered the different grinding periods i.e. 2, 10, 20, and 40hrs as to produce different particle fineness. It was perceived through the laboratory findings that the more the grinding period, finer the particle sizes. Besides that, cement paste with 10, 20 and 30% of ground CBA as a substitute of ordinary portland cement (OPC) by weight was prepared, it was observed that the consistency of OPC paste increases with the addition of ground CBA. Moreover, initial and final setting time of cement paste containing ground CBA was observed higher than the OPC paste. Hence, based on experimental analysis and energy efficiency scenario, grinding period of 20hrs with specific surface area 3835.75 cm 2 /g is suggested for the future studies.

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“…The BA represented comparatively lower specific gravity and higher water absorption compared with the granite aggregate. Ramzi et al [35] have reported similar results of specific gravity. The higher carbon content in BA may result in lower specific gravity [36].…”

Section: Materials and Methodology 21 Aggregate Characterisationmentioning

confidence: 56%

Laboratory Investigation of Coal Bottom Ash Modified Warm Mix Asphalt

et al. 2021

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Bottom Ash (BA), a coal combustion by-product, found to be a potential material when used to produce asphalt mixture. However, some of its characteristics make it a questionable material for the surface course. Therefore, this study aims to evaluate the compatibility of BA in Warm Mix Asphalt (WMA) technology through the basic mechanical properties of the asphalt mixtures for binder course layer (AC 28). Two WMA chemical additives, Cecabase RT and Evotherm 3G, were used at the concentrations of 0.3, 0.4 and 0.5% from the binder's weight. The binder properties were assessed through penetration, softening point and viscosity tests. The Marshall mix design was used to determine the optimum binder content (OBC). The additive dosage and production temperature for WMA were determined through Marshall stability, flow, air voids and specific gravity. The results show that the additives did not significantly affect the binder properties, although, at 0.4% Evotherm 3G, a drop of 17.5% in penetration was observed. Cecabase RT produced WMA with promising results but did not enhance the workability of WMA containing bottom ash (BAWMA). By lowering the production temperature of 25 °C, WMA and BAWMA at 0.4 %, Evotherm 3G demonstrated comparable workability to the conventional Hot Mix Asphalt (HMA). The data achieved through this study would be a guiding approach towards the application of BA in WMA technology for sustainable pavements.

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Physical and Chemical Properties of Coal Bottom Ash (CBA) from Tanjung Bin Power Plant

Cited by 47 publications

References 14 publications

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Effects of Grinding Process on the Properties of the Coal Bottom Ash and Cement Paste

Laboratory Investigation of Coal Bottom Ash Modified Warm Mix Asphalt

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