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    Effect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases

    Source: Journal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 003::page 04021001-1
    Author:
    Maheshbabu Jallu
    ,
    Sireesh Saride
    ,
    Arul Arulrajah
    ,
    Subrahmanyam Challapalli
    ,
    Robert Evans
    DOI: 10.1061/(ASCE)MT.1943-5533.0003581
    Publisher: ASCE
    Abstract: The long-term integrity of fly ash (FA) geopolymer-stabilized high-percentage reclaimed asphalt pavement (RAP) in the pavement base layer was investigated in this research. The FA geopolymer-stabilized RAP and virgin aggregate (VA) mixes were studied as an economical and durable alternative to 100% VA bases, with an emphasis on the influence of curing time. The maturity age of FA is usually set as 28 days, similar to traditional portland cement. However, due to partial pozzolanic reactions, though geopolymerized, the dilution of partial FA particles does not fully play its role at 28 days of curing time. Hence, this is not a realistic reference time for predicting the service life of FA geopolymer-stabilized aggregate blends. Therefore, a detailed experimental investigation was undertaken to evaluate the ultimate strength, durability, and microstructural characteristics of four distinct FA geopolymer-stabilized RAP:VA blends for a long-term ambient curing time up to 270 days. In this study, the long-term cured specimens showed significant improvement in mechanical strength and stiffness, yielding lower permanent deformations. It was noticed that only about 12% and 40% average unconfined compressive strength (UCS) could be achieved in 7- and 28-day cured specimens, respectively, with reference to their ultimate strength at 270 days. Hence, to examine the microstructural characteristics of powdered FA geopolymer blends, X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), and Fourier transform-infrared spectroscopy (FT-IR) studies were performed. The test results revealed that the consumption of reactive metal ions was continued for an extended period under a controlled curing regime, which resulted in improved mechanical strength and durability of the solidified product.
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      Effect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases

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    contributor authorMaheshbabu Jallu
    contributor authorSireesh Saride
    contributor authorArul Arulrajah
    contributor authorSubrahmanyam Challapalli
    contributor authorRobert Evans
    date accessioned2022-01-31T23:32:16Z
    date available2022-01-31T23:32:16Z
    date issued3/1/2021
    identifier other%28ASCE%29MT.1943-5533.0003581.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4269895
    description abstractThe long-term integrity of fly ash (FA) geopolymer-stabilized high-percentage reclaimed asphalt pavement (RAP) in the pavement base layer was investigated in this research. The FA geopolymer-stabilized RAP and virgin aggregate (VA) mixes were studied as an economical and durable alternative to 100% VA bases, with an emphasis on the influence of curing time. The maturity age of FA is usually set as 28 days, similar to traditional portland cement. However, due to partial pozzolanic reactions, though geopolymerized, the dilution of partial FA particles does not fully play its role at 28 days of curing time. Hence, this is not a realistic reference time for predicting the service life of FA geopolymer-stabilized aggregate blends. Therefore, a detailed experimental investigation was undertaken to evaluate the ultimate strength, durability, and microstructural characteristics of four distinct FA geopolymer-stabilized RAP:VA blends for a long-term ambient curing time up to 270 days. In this study, the long-term cured specimens showed significant improvement in mechanical strength and stiffness, yielding lower permanent deformations. It was noticed that only about 12% and 40% average unconfined compressive strength (UCS) could be achieved in 7- and 28-day cured specimens, respectively, with reference to their ultimate strength at 270 days. Hence, to examine the microstructural characteristics of powdered FA geopolymer blends, X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), and Fourier transform-infrared spectroscopy (FT-IR) studies were performed. The test results revealed that the consumption of reactive metal ions was continued for an extended period under a controlled curing regime, which resulted in improved mechanical strength and durability of the solidified product.
    publisherASCE
    titleEffect of Curing Time on the Performance of Fly Ash Geopolymer-Stabilized RAP Bases
    typeJournal Paper
    journal volume33
    journal issue3
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0003581
    journal fristpage04021001-1
    journal lastpage04021001-10
    page10
    treeJournal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 003
    contenttypeFulltext
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