Use of recycled coal bottom ash in reinforced concrete beams as replacement for aggregate

Karalar, Memduh; Bilir, Turhan; Çavuşli, Murat; Özkılıç, Yasin Onuralp; Sabri, Mohanad Muayad Sabri

doi:10.3389/fmats.2022.1064604

Cited by 58 publications

(32 citation statements)

References 44 publications

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“…Industrial steel fibers can be replaced by an equal (or slightly higher) number of recycled fibers without impairing the mechanical properties, provided that the recycled fibers have the appropriate geometrical characteristics [ 36 ]. When recycled concrete additives are successfully used, numerous benefits for the environment are recognized (the reduction in the carbon footprint, energy-saving aspect, and reduction in the amount of waste through their applications in a new material) [ 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

et al. 2023

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This study presents the results of laboratory experiments conducted to determine the mechanical parameters for cement mortar with various quantities of waste fibers, polypropylene microfibers, and steel microfibers. Waste fibers were used as samples and obtained using an end-of-life car tire recycling process. For comparison, samples with the addition of steel and polypropylene microfibers were tested. The same degrees of fiber reinforcement were used for all types of fibers. Ultimately, 22 mixtures of cement mortar were prepared. The aim of this study is therefore to present and compare basic mechanical parameter values. Compressive strength, flexural strength, fracture toughness, and flexural toughness were of particular interest. A three-point bending test was performed on three types of samples, without a notch and with a notch of 4 and 8 mm. The results show that the use of steel microfibers in the cement mortar produces a product with better properties compared to a mixture with steel cord or polypropylene fibers. However, the cement mortar with the steel cord provides better flexural strength and greater flexural toughness factors compared to the cement mortar with polypropylene fibers. This means that the steel cord is a full-value ecological replacement for different fibers.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

et al. 2023

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“…The opportunity of using recycled aggregates to produce new mortar and concrete compositions has attracted the attention of several researchers. Different types of recycled aggregates, such as waste glass [ 12 , 13 ], rubber tree seed shells [ 14 ], coconut fiber [ 15 ], bottom ash [ 16 ], PET plastic waste [ 17 ], waste marble [ 18 , 19 ], and iron slag [ 20 ], have been investigated as replacements for aggregate.…”

Section: Introductionmentioning

confidence: 99%

A New Environmentally Friendly Mortar from Cement, Waste Marble and Nano Iron Slag as Radiation Shielding

et al. 2023

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Improving mortar shielding properties to preserve environmental and human safety in radiation facilities is essential. Conventional cement mortars, composed of cement, water, and lime aggregate, are crucial for radiation shielding. Using recycled aggregates to produce new mortar and concrete compositions has attracted the attention of several researchers. In the current study, waste marble and iron slag as aggregates are used to create novel cement mortar compositions to study the aggregate’s impact on the radiation attenuation capability of the mortar. Three mortar groups, including a control mortar (CM-Ctrl), were prepared based on cement and waste marble. The other two groups (CM-MIS, CM-NIS), contained 25% iron slag at different particle sizes as a replacement for a waste marble. The study aims to compare iron slag in their micro and nano sizes to discuss the effect of particle size on the mortar radiation capability. For this purpose, the NaI scintillation detector and radioactive point sources (241Am, 133Ba, 137Cs, 60Co, and 152Eu) were utilized to measure several shielding parameters, such as the linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP), for the produced mortars at different photon energies. Furthermore, the transmission electron microscope (TEM) is used to measure the particle size of the aggregates. In addition, a scanning electron microscope (SEM) is utilized to acquire the cross-section morphologies of the prepared mortars. According to our findings, mortars prepared with nano-iron slag and waste marble offered superior shielding capabilities than mortars containing natural sand or fine crushed stone. The nano iron slag mortar can be utilized in place of typical sand mortar for applications as rendering or plastering materials for building medical diagnostic and CT scanner rooms, due to its improved shielding abilities.

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“…Many studies have been performed using other recycled waste materials such as recycled coal bottom ash, waste lathe scraps, waste lathe fibres, and steel fibres extracted from waste tyres for cement-based composites [ 2 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] and these studies are also important as they address the reduction of environmental problems. In addition, studies have been published describing the use of waste cellulose-based fibres (i.e., both waste paper/cardboard and waste paper sludge) for cement-based composites [ 6 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Cement Composite Integrating Waste Cellulose Fibre: A Comprehensive Review

et al. 2023

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This review presents the research conducted to date in the field of cement-based composites reinforced with waste paper-based cellulose fibres, focusing on their composition, mechanical properties, and durability characteristics. The literature demonstrates that the properties of raw material (depending on their own chemical composition) significantly influence the formation of the cement composite binders. When considering fresh properties, the presence of silica and magnesium compounds generally lead to favourable effects on the setting of the cement composite when combined with waste paper cellulose fibre. Reduction in density values, i.e., approximately 25%, was observed with the inclusion of waste paper fibres from 20 to 80% in cement composites. The homogeneous dispersion of fibres in the matrix is one of the crucial factors to achieve in order to develop composites with well-balanced mechanical properties incorporating waste paper cellulose fibres. Hence, dispersion of fibres can be improved by increasing water quantity corresponding to the optimal value, which was a water/cement ratio of 0.64 leading to optimum strength properties of the composite. Even though the effect of fibre dispersion in the matrix improves with the addition of water, higher porosity and voids govern the strength properties beyond an optimum water-to-cement ratio. Higher porosity leads to an increase in the water absorption and a lowering of the thermal conductivity properties with the addition of paper fibre in cement binders. Paper fibre absorbs a high amount of water leading to higher water absorption. This phenomenon is related to the hydrophilic nature of cellulosic fibres absorbing some volume of water due to their microporous structure.

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Use of recycled coal bottom ash in reinforced concrete beams as replacement for aggregate

Cited by 58 publications

References 44 publications

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

A New Environmentally Friendly Mortar from Cement, Waste Marble and Nano Iron Slag as Radiation Shielding

Sustainable Cement Composite Integrating Waste Cellulose Fibre: A Comprehensive Review

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