Mitigation of ASR expansion in concrete using ultra-fine coal bottom ash

Oruji, Soheil; Brake, Nicholas A.; Guduru, Ramesh K.; Nalluri, Likhith; Günaydın-Şen, Özge; Kharel, Krishna; Rabbanifar, Saeed; Hosseini, Seyedsaeid; Ingram, Emily

doi:10.1016/j.conbuildmat.2019.01.013

Cited by 44 publications

(22 citation statements)

References 52 publications

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“…For instance, it was reported that using CBA as sand replacement increased the concrete compressive and flexural strengths and decreased its shrinkage strains [30][31][32][33]. Oruji et al [34] studied the utilization of ultrafine coal bottom ash as partial cement replacement for the mitigation of alkali-silica reaction in concrete. The studied dosage of ultrafine coal ash was 9%, 23%, 33% and 41%, while maintaining the water-to-binder ratio at 0.55.…”

Section: Introductionmentioning

confidence: 99%

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Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

et al. 2020

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Each year, about 730 million tons of bottom ash is generated in coal fired power plants worldwide. This by-product can be used as partial replacement for Portland cement, favoring resource conservation and sustainability. Substantial research has explored treated and processed coal bottom ash (CBA) for possible use in the construction industry. The present research explores using local untreated and raw CBA in mitigating the alkali–silica reaction (ASR) of reactive aggregates in concrete. Mortar bar specimens incorporating various proportions of untreated CBA were tested in accordance with ASTM C1260 up to 150 days. Strength activity index (SAI) and thermal analysis were used to assess the pozzolanic activity of CBA. Specimens incorporating 20% CBA achieved SAI greater than 75%, indicating pozzolanic activity. Mixtures incorporating CBA had decreased ASR expansion. Incorporating 20% CBA in mixtures yielded 28-day ASR expansion of less than the ASTM C1260 limit value of 0.20%. Scanning electron microscopy depicted ASR induced microcracks in control specimens, while specimens incorporating CBA exhibited no microcracking. Moreover, low calcium-to-silica ratio and reduced alkali content were observed in specimens incorporating CBA owing to alkali dilution and absorption, consequently decreasing ASR expansion. The toxicity characteristics of CBA indicated the presence of heavy metals below the US-EPA limits. Therefore, using local untreated CBA in concrete as partial replacement for Portland cement can be a non-hazardous alternative for reducing the environmental overburden of cement production and CBA disposal, with the added benefit of mitigating ASR expansion and its associated costly damage, leading to sustainable infrastructure.

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Section: Introductionmentioning

confidence: 99%

“…Further, it was reported that the ASR expansion was decreased at all ultrafine coal ash dosages. Specimens were tested up to 28 days [34]. Gooi et al [35] reported the effect of partial substitution of aggregates and cement in concrete by coal bottom ash (CBA) on the compressive strength based on existing literature.…”

Section: Introductionmentioning

confidence: 99%

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

et al. 2020

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“…To enhance simultaneously the heat dissipation and anti-corrosion performance, composite coating was used to preserve the electronic components [2]. For instance, the use of alkali silicate mixed with nanoparticles was demonstrated to increase thermal conductivity [3][4].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Micro Heat Exchanger in Electronic Cooling Applications

Mokrane

2021

Journal of Thermal Engineering

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To operate under normal conditions and depending on the technology used, the electronic components must be at a temperature below 80 to 85°C. Several cooling systems were investigated with the aim of improving the heat transfer process in this kind of applications. Single-phase liquid cooling systems, which mainly consist of a hot watercooled micro-heat exchanger, provide an efficient approach to dissipate heat flows. In the present study, numerical and experimental investigations were carried out to study the characteristics of laminar flow and forced convective heat transfer in micro-channels. The inlet temperature of cooling water ranged from 25 to 65°C, the Reynolds number of water flow varied from 250 to 2000, and the electronic power supply component was set at 50, 80 and 120 W. The results showed that the micro heat exchanger was able to dissipate around 70 to 78% of the heat released by the electronic component. As regards the numerical results, it was observed that the inlet water temperature of 55ºC kept a heat source up to 80 W for a temperature source below the critical value of 80ºC.

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“…Coal bottom ash (CBA) is an industrial waste produced at the bottom of coal furnaces in thermal power plants [1][2][3][4][5]. Gollakota et al [6] indicated that ash ponds or lagoons have caused numerous ecological problems and severe distress to local communities due to their increasing landfill space and escalating disposal costs.…”

Section: Introductionmentioning

confidence: 99%

Strength Properties of High‐Strength Concrete Containing Coal Bottom Ash as a Replacement of Aggregates

Yang

Park

Lê

et al. 2020

Advances in Materials Science and Engineering

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Most previous studies on the strength properties of coal bottom ash (CBA) concrete have focused on concrete with a normal compressive strength, and thus, studies on the strength properties of high-strength concrete (HSC) containing CBA are limited. Therefore, the effects of replacing fine aggregates with CBA and variations in the curing age on the strength properties of HSC with a compressive strength of greater than 60 MPa were investigated in this study. The different CBA contents included 25, 50, 75, and 100%, and the different curing ages were 28 and 56 days. The mechanical properties of the HSC with CBA incorporated as fine aggregates were examined. The experimental results revealed that CBA could be partially or totally substituted for fine aggregates during HSC production. The test results also showed that the compressive, splitting tensile, and flexural strengths of the HSC containing CBA fine aggregates slightly decreased as the CBA content increased. Moreover, useful relationships between the compressive strength, splitting tensile strength, and flexural strength were suggested, and the predictions reasonably agreed with the measurements. Compared to those of the control specimen, the pulse velocities of the HSC specimens at various CBA contents decreased by less than 3%. In addition, equations for predicting the strength values of CBA concrete by using the ultrasonic pulse velocity were suggested.

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Mitigation of ASR expansion in concrete using ultra-fine coal bottom ash

Cited by 44 publications

References 52 publications

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

Recycling Untreated Coal Bottom Ash with Added Value for Mitigating Alkali–Silica Reaction in Concrete: A Sustainable Approach

Performance Analysis of a Micro Heat Exchanger in Electronic Cooling Applications

Strength Properties of High‐Strength Concrete Containing Coal Bottom Ash as a Replacement of Aggregates

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