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Author: search.filters.author.Huan, Vo Nguyen Phu

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    Optimizing Silica Fume Admixture for Enhanced Strength of Soil–Cement Columns
    (2025-10-01)
    Huan, Vo Nguyen Phu
    ;
    Nguyen, Trong Nghia
    ;
    Chaiyaput, Salisa
    The Deep Soil Mixing (DSM) method is effective for rapid soil stabilization. In contrast, it presents challenges when applied to expansive and problematic soils, as well as in environments with high salinity. This study investigates the incorporation of silica fume as an admixture to enhance the unconfined compressive strength (UCS) of soil–cement columns using the DSM construction method. Soil–cement specimens were prepared with silica fume-to-cement ratios of 0%, 1%, 3%, and 5% and cured under varied conditions, including untreated natural soil, tap water, and saline solutions with 2.5% and 5% NaCl concentrations. UCS tests conducted on 7, 14, 28, and 60 days revealed that a 1% silica fume dosage optimally enhances strength across all curing environments, with soil-based curing achieving the highest performance. The improvement is attributed to the formation of calcium silicate hydrate (C–S–H), which enhances the UCS of the specimens. However, higher silica fume contents led to reduced efficiency due to particle agglomeration and reduced hydration reaction. By addressing the challenges of traditional DSM applications, this study demonstrates the potential of silica fume to improve the performance and durability of soil–cement columns, offering a sustainable and practical approach for geotechnical engineering in diverse and challenging environments.
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    Sustainable pavement recycling: Utilization of cement and asphalt waste dust to improve CBR and permeability
    (2025-09-01)
    Chaiyaput, Salisa
    ;
    Thatmas, Natthapong
    ;
    Nguyen, Trong Nghia
    ;
    Huan, Vo Nguyen Phu
    ;
    Mase, Lindung Zalbuin
    This study aims to utilize asphalt waste dust, a pollutant by-product of the asphalt production process, to improve the quality of recycled pavement materials for use as base course materials, under the standards of the Department of Rural Roads and the Department of Highways, Thailand. The mixture consisted of 70 % by weight (wt%) reclaimed asphalt pavement (RAP), 30 wt% crushed rock (CR), 3.5 wt% cement (C), and 20 wt% asphalt waste dust (AD), in comparison to the general pavement recycling (RAP-CR-C). Compaction test, permeability test, California Bearing Ratio (CBR) test, and scanning electron microscope (SEM) analysis were performed under all testing conditions. The highest performance was achieved for the recycled pavement materials, containing 3.5 wt% cement and 20 wt% asphalt waste dust (RAP-CR-C-AD20). The coefficient of permeability was 2.32 × 10<sup>-7</sup> cm/s under pressurized constant head, 2.40 × 10<sup>-7</sup> cm/s under an 8 mm falling head, and 2.59 × 10<sup>-7</sup> cm/s under a 14 mm falling head. The CBR values were 493 % at 0.1 in (2.54 mm) penetration and 491 % at 0.2 in (5.08 mm) penetration. The RAP-CR-C-AD20 exhibited a low coefficient of permeability but a high CBR, compared to those of RAP-CR-C, and above the minimum base course requirement (CBR > 80 %). This study highlights the potential of using asphalt waste dust in pavement recycling as an innovative solution that not only reduces waste but also contributes to sustainable road construction practices.
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