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Author: search.filters.author.Sertsoongnern, PimchanokSubject: search.filters.subject.Strength

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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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    The use of asphalt waste dust for stabilization of sustainable pavement recycling
    (2024-10-04)
    Ayawanna, Jiratchaya
    ;
    Suksawat, Taweephong
    ;
    Sertsoongnern, Pimchanok
    ;
    Chaiyaput, Salisa
    The asphalt waste dust as a sustainable material for stabilizing pavement recycling, which is cold in-place recycling (consists of reclaimed asphalt pavement, crushed rock aggregate base, and ordinary Portland cement), was presented in this study. To understand the effect of asphalt waste dust on stabilizing pavement recycling, 10–30 wt% asphalt waste dust was added and compared with the behavior of pure old-asphalt pavement material and old-asphalt pavement material mixed with 3.5 % OPC. The compaction test, unconfined compressive strength test (UCS), indirect tensile strength tests (IDT), and scanning electron microscope analysis were conducted under various mixing conditions. The addition of asphalt waste dust up to 20 wt% achieved desirable results of UCS and IDT involved with microstructural development, which were beyond the standard requirements of the base course from the Department of Rural Roads and the Department of Highway. A maximum of 20 wt% asphalt waste dust can be utilized for practical use with pavement recycling in the base course.