A critical review on mechanochemical processing of fly ash and fly ash-derived materials

Grabias, Ewelina; Franus, Wojciech

doi:10.1016/j.scitotenv.2022.160529

Cited by 51 publications

(22 citation statements)

References 105 publications

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“…Fly ash, a main waste product from coal combustion, has become the interest of many researchers due to its potential for environmental problems but offering improved properties for concrete construction [20][21][22][23]. Previous researchers have reported that the use of fly ash in SCC production shows a positive effect in terms of its fresh and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

et al. 2023

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This study aims to utilize fly ash and waste PET bottles for producing more sustainable self-compacting concrete (SCC) with better mechanical strength. Fly ash is utilized as a supplementary cement material and waste PET bottles as fiber reinforcement to improve its flexural strength and achieve the targeted compressive strength. The experimental works were conducted on eight variations using 80 specimens, divided into two main groups of partial cement replacement using 0% and 15% fly ash by weight. The two variants are added with PET fiber based on the volume fractions of 0%, 0.25%, 0.50%, and 0.75%. Fresh concrete was tested using the slump flow method (T50) and the Visual Stability Index (VSI) based on ASTM 1611. The hardened concrete tests are conducted after 56 days and include testing the concrete's compressive strength, flexural strength, and ultrasonic pulse velocity. Test results showed that the presence of PET fiber in the SCC mix decreased its flowability. However, when added up to 0.75%, the mixes still meet the flowability requirements of fresh-state SCC. PET fiber addition tends to reduce the compressive strength, whereas the reduction in compressive strength of SCC with PET fiber without fly ash is insignificant. However, in SCC that uses fly ash, the addition of PET fiber causes a significant decrease in its compressive strength. Adding PET fiber into SCC mixes can increase flexural strength, both for the two variants: SCC without fly ash and SCC with fly ash. It can be concluded that PET waste fiber with an aspect ratio of 40 can be added up to 0.5% for SCC without fly ash and up to 0.25% by volume fraction for SCC with fly ash addition. The ultrasonic pulse velocity test results have an excellent tendency to predict the concrete's compressive and flexural strengths. Therefore, the UPV test can be applied for the non-destructive test evaluation of PET fiber-reinforced SCC. Doi: 10.28991/CEJ-2023-09-02-014 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

et al. 2023

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“…and (2) chemical stabilization (by adding materials such as fly ash, salts, cement, lime, etc.). Recently, the addition of synthetic fibers [5][6][7][8][9][10][11][12][13] and natural fibers [13][14][15][16][17][18][19] has been considered among effective soil improvement techniques. Many studies have shown that the use of fibers (of natural or synthetic origin) gives satisfying results regarding the expansive behavior of soils [1-4, 8, 9, 12-14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polypropylene Fibers on Swelling Potential and Shear Strength of Clay

2023

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Expansive clays can cause major problems for urban development (roads, railways, infrastructure, etc.); therefore, reducing the swelling potential of clays has always been a concern in the geotechnical field. The presented paper investigates the effect of polypropylene reinforcement fibers on the swelling potential and shear strength of clay. The samples studied were taken from the clayey region of Mila, located in the northern east of Algeria. The experimental procedure adopted in this research consists first of the assessment of the physical, mechanical, and mineralogical characteristics of the soil samples without reinforcement. Then, swelling pressure, swelling rate, and swelling index are used to assess the swelling potential of these samples. After the reinforcement using a variety of polypropylene fiber concentrations (2 to 6% of the weight of the dry clay), the free swelling is clearly reduced. The optimum reinforcement rate in this case is 4%, in which the swelling was reduced by 90.7%. Finally, to offer more insights regarding the impact of clay reinforcement using polypropylene fibers, the effect of this later on the mechanical properties of the studied clay was also analyzed through the tangential shear strength. It was found that the polypropylene fibers increased the tangential shear resistance of Mila’s clay. Doi: 10.28991/CEJ-2023-09-03-04 Full Text: PDF

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“…Adding a proper amount of fly ash can improve the total pore area, average pore size and total porosity of concrete and improve its mechanical properties (Javed et al, 2022). At the same time, the addition of fly ash can reduce the hydration heat, reduce the probability of early thermal cracking, and reduce the autogenous volume deformation the initial strength of concrete (Wang et al, 2020;Grabias-Blicharz and Franus, 2023). However, lithium slag, unlike steel slag, phosphorus slag, and fly ash, is not easy to obtain, and it is produced in relatively few areas.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the performance of cement mortar incorporating lithium slag as a super-fine aggregate

Dong

Chen

et al. 2023

Front. Mater.

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As a by-product of lithium salt mining, the emission of lithium slag increases yearly due to increased demand. Therefore, the utilization of lithium slag faces a huge challenge. In this study, a new approach to using lithium slag as a super-fine aggregate in cement systems was proposed. The use of lithium slag as a super-fine aggregate replacing 0%, 30%, 50%, 70%, and 100% of the standard sand was tested. The main hydration products of cement–lithium slag paste were calcium silicate hydrate gel, calcium hydroxide, unhydrated particles, and a small amount of ettringite. Lithium slag as a super-fine aggregate could significantly reduce the dead load of structures, enhance flexural and compressive strength and the peak stress of mortar, and no more than 50% lithium slag could significantly enhance the permeability of mortar. The study revealed that the replacement rate of lithium slag as a super-fine aggregate could reach 50%, which is five times more than the amount used as supplementary cementitious material. Therefore, the study brings an innovation in the use of lithium slag in cement systems and improves the performance of cement mortar.

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A critical review on mechanochemical processing of fly ash and fly ash-derived materials

Cited by 51 publications

References 105 publications

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

Effect of Polypropylene Fibers on Swelling Potential and Shear Strength of Clay

Investigation of the performance of cement mortar incorporating lithium slag as a super-fine aggregate

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