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Author: search.filters.author.Ayawanna, JiratchayaSubject: search.filters.subject.Fly ash

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    Utilization of ladle furnace slag and fly ash as partially replacement of cement
    (2025-03-01)
    Thwe, Khin Sam
    ;
    Ayawanna, Jiratchaya
    ;
    Mase, Lindung Zalbuin
    ;
    Chaiyaput, Salisa
    Ladle Furnace Slag (LFS) and fly ash (FA) are industrial waste products commonly deposited in landfills, while the cement industry is a major source of carbon dioxide (CO<inf>2</inf>) emissions. Previous research has explored using LFS and FA as cement replacement materials to help mitigate environmental impacts. Yet, no studies have explored combining LFS and FA as cement replacement materials. Therefore, this research highlights the study of the combination of LFS and FA mixes as a partial cement replacement. The mix design for cement replacement materials was developed by combining ordinary Portland cement (OPC), LFS, and FA in the following weight ratios: 10:10:80, 20:20:60, and 30:30:40. These mix designs were assessed in comparison to 100%OPC (% by weight), evaluating key properties (bulk density, specific gravity, normal consistency, setting time, compressive strength, flexural strength, and microstructural characteristics). According to the findings, incorporating LFS and FA, both pozzolanic materials effectively improved the strength of the material by promoting a pozzolanic reaction, particularly during the final stages of curing. Furthermore, it was found that a mixed design containing 20% OPC, 20% LFS, and 60% FA demonstrated suitable properties for cement replacement in various applications, with beneficial results in terms of setting time and strength development. From X-ray fluorescence (XRF) and scanning electron microscope (SEM analysis), C-S-H gel, as well as Ca(OH)<inf>2</inf> and Mg(OH)<inf>2</inf> chemical compounds, were formulated. The aforementioned replacement is being used to promote environmental sustainability through the efficient use of industrial byproducts.
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    Performance evaluation of developed mixed cement containing asphalt waste dust and class-C fly ash in sulfate salt solution test
    (2024-12-01)
    Sertsoongnern, Pimchanok
    ;
    Ayawanna, Jiratchaya
    ;
    Chaiyaput, Salisa
    The performance of newly developed cement mixes comprising asphalt waste dust and fly ash for construction in areas with high sulfate salt content was evaluated in this study. In comparison to 100% Ordinary Portland cement Type 1 (OPC), mixes of 50 wt% OPC with 20 wt% asphalt waste dust and 30 wt% fly ash, as well as 50 wt% OPC with 50 wt% fly ash, were tested over a 30- and 90-day comparative study in magnesium sulfate solution, respectively. The compressive strength, weight change, and expansion of mixed cement samples are investigated through chemical, phase, and microstructural studies. The replacement of 50% OPC with fly ash and asphalt waste dust prevented the samples from expanding and cracking in the sulfate salt solution during the 90-day test period. By using fly ash at less than 50 wt% in combination with asphalt waste dust, a dense microstructure was obtained, inhibiting the formation of the harmful magnesium silicate hydrate phase and the degradation of strength in the mixed cement samples.
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    Utilization of asphalt waste dust with fly ash in mixed cement materials for sustainable construction
    (2024-10-01)
    Sertsoongnern, Pimchanok
    ;
    Ayawanna, Jiratchaya
    ;
    Kingnoi, Namthip
    ;
    Chaiyaput, Salisa
    The production of asphalt concrete generates asphalt waste dust particles that harm the environment. In this study, asphalt waste dust and fly ash were combined in different ratios to serve as cement replacement material. With replacement ratios of 20–30 wt% asphalt waste dust with fly ash, the maximum strength of a mixed-cement sample meets the industrial requirement after 7 days of curing. Compared to a cement concrete sample, a higher strength than the industrial requirement was achieved after prolonged curing under plastic wrap. This curing condition allows the retention of Ca<sup>2+</sup> ions and moisture, contributing to the hydration and pozzolanic reactions in the mixed-cement sample. The strengthened microstructure with the C–S–H phase was clearly seen, while Ca(OH)<inf>2</inf> disappeared in the mixed-cement sample. This finding indicates that upcycled asphalt waste dust in a cement-based material is a potential method for utilizing asphalt waste dust in the construction sector.