Environmental impact and potential use of coal fly ash and sub-economical quarry fine aggregates in concrete

Lieberman, Roy Nir; Knop, Yaniv; Querol, Xavier; Moreno, Natàlia; Muñoz-Quirós, Carmen; Mastai, Yitzhak; Anker, Yaakov; Cohen, Haim

doi:10.1016/j.jhazmat.2017.11.047

Cited by 39 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the waste can be used a a mixture of cement replacement for high rise building. According [7] to form an economical aggregate sand substitute to be used as a concrete filler product. Fly ash can be used for concrete mixed.…”

Section: Literature Reviewmentioning

confidence: 99%

The Efficiency of Fly Ash and Cement Slag to Development Building

Hidayawanti¹

2019

GEOMATE

View full text Add to dashboard Cite

In world construction, the construction of high-rise buildings almost entirely uses concrete. This study uses fly ash and cement slag as a cement substitute as a reduction in cement requirements. This is due to the limited amount of cement in the market and the binding function of cement and the increasing cement prices. The use of fly ash and cement slag is toxic hazardous waste material that must be handled so that it can be used properly. From the results of the age strength of concrete 1-3 days, the compressive strength of fly ash is higher than that of cement slag but from a mixture of 28 days, it reaches 100% in accordance with the specified standard. In this laboratory test for the use of fly ash and slag cement, 50%, in the future it is necessary to research that the use of fly ash and slag cement can be up to 70% so that the use of fly ash material and cement slag can replace the function of concrete mixed cement as a binder of coarse and fine material to get concrete compressive strength with specified standards. Production costs can be minimized so that if this applied can avoid the company from potential billions/year losses.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

The Efficiency of Fly Ash and Cement Slag to Development Building

Hidayawanti¹

2019

GEOMATE

View full text Add to dashboard Cite

show abstract

“…FA is an effective, very desirable waste for recycling purposes since concretes containing these supplements in proportions of up to 20% as OPC substitutes exhibit enhanced stability and fracture toughness [ 41 , 42 , 43 , 44 ], deterioration resistance [ 45 ], and tolerance to elevated temperatures [ 46 ]. Additionally, by utilizing FA, eco-friendly green material for civil engineering might be produced [ 47 , 48 , 49 , 50 , 51 ] and promote the development of a specific microstructure in concrete matrices, thereby facilitating the restriction of harmful elements [ 52 ]. Initially, the usage of FA in concrete enables the reduction of problematic disposal sites associated with this waste.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Experimental and Modeling of Fly Ash-Based Concrete

et al. 2022

View full text Add to dashboard Cite

The application of supplementary cementitious materials (SCMs) in concrete has been reported as the sustainable approach toward the appropriate development. This research aims to compare the result of compressive strength (C-S) obtained from the experimental method and results estimated by employing the various modeling techniques for the fly-ash-based concrete. Although this study covers two aspects, an experimental approach and modeling techniques for predictions, the emphasis of this research is on the application of modeling methods. The physical and chemical properties of the cement and fly ash, water absorption and specific gravity of the aggregate used, surface area of the cement, and gradation of the aggregate were analyzed in the laboratory. The four predictive machine learning (PML) algorithms, such as decision tree (DT), multi-linear perceptron (MLP), random forest (RF), and bagging regressor (BR), were investigated to anticipate the C-S of concrete. Results reveal that the RF model was observed more exact in investigating the C-S of concrete containing fly ash (FA), as opposed to other employed PML techniques. The high R2 value (0.96) for the RF model indicates the high precision level for forecasting the required output as compared to DT, MLP, and BR model R2 results equal 0.88, 0.90, and 0.93, respectively. The statistical results and cross-validation (C-V) method also confirm the high predictive accuracy of the RF model. The highest contribution level of the cement towards the prediction was also reported in the sensitivity analysis and showed a 31.24% contribution. These PML methods can be effectively employed to anticipate the mechanical properties of concretes.

show abstract

“…Most of the recent papers on coal fly ash are dedicated to protect the environment from toxic constituents or the bulk recovery of the precious metal from coal fly ash. 8,9 Zhao et. al.…”

Section: Introductionmentioning

confidence: 99%

Leaching of Gallium from Coal Fly Ash, Alumina and Sediment Samples with an Acid Mixture for its Determination by ICP-OES

Sahayam¹,

Venkateswarlu²,

Thangavel³

2020

At.Spectrosc.

View full text Add to dashboard Cite

Leaching of gallium (Ga) from coal fly ash, alumina and sediment is reported for its determination by inductively coupled plasma optical emission spectrometry (ICP-OES). A mixture of acids (H2SO4, HNO3 and HF) was used for the leaching process which was carried out overnight at room temperature or heated for 1 h on a hot plate. HF is essential for the quantitative recovery of Ga from coal fly ash. Leaching with either HCl or HNO3 in combination with HF also yielded quantitative recoveries of Ga from coal fly ash, but not from other matrices. After leaching, HF and HNO3 were evaporated and HCl was added to the acid leach before dilution for analysis. When mixed acid leaching was employed, leaching of Ga was 92-102%. For accuracy, the method was applied to a sediment sample, a candidate material prepared as the in-house CRM, and the values obtained were well within the uncertainty reported. The present procedure was validated using the solvent extraction method. The values by the two methods were in close agreement according to the Student’s t-test with a confidence level of 95%. The limit of detection was 0.45 mg Kg-1. The analytical methodology was applied for the determination of Ga in three coal fly ash samples, two from thermal power plants and a NIST CRM 1633b (not certified for Ga) as well as an alumina sample from an aluminum industry facility. A red mud sample, by-product of Bayer’s process of aluminum extraction, was also analyzed using HCl/HF and HNO3/HF leach.

show abstract

Environmental impact and potential use of coal fly ash and sub-economical quarry fine aggregates in concrete

Cited by 39 publications

References 25 publications

The Efficiency of Fly Ash and Cement Slag to Development Building

The Efficiency of Fly Ash and Cement Slag to Development Building

Comparative Study of Experimental and Modeling of Fly Ash-Based Concrete

Leaching of Gallium from Coal Fly Ash, Alumina and Sediment Samples with an Acid Mixture for its Determination by ICP-OES

Contact Info

Product

Resources

About