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All Journal Jurnal Sosial dan Teknologi Journal of Green Science and Technology
Naess, Victor Firstkiel Feber
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Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Transportation

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Improving Shear Strength Of Expansive Soil Through Asphalt Emulsion And Local Pozzolanic Additives Oktofani, Khansa Nuansa; Syahril, Syahril; Indra Noer Hamdhan; Naess, Victor Firstkiel Feber
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10408

Abstract

Expansive clayshale soils pose a significant geotechnical challenge due to their high swell-shrink potential and low shear strength, necessitating urgent development of effective and sustainable stabilization methods. This study explores the stabilization of such problematic soils using a combination of emulsified asphalt (AE) and Bledug Kuwu mud (LBK), a natural pozzolanic byproduct derived from a unique geological phenomenon in Central Java, Indonesia. A total of 51 cylindrical specimens were prepared with a fixed 8% AE content and varying LBK contents (6%, 10%, 14%, and 18%) by dry weight of soil. The mechanical properties were evaluated using Unconsolidated Undrained (UU) triaxial tests, while Scanning Electron Microscopy (SEM) was employed to examine microstructural evolution. The results highlight a marked improvement in shear strength parameters cohesion (c) and internal friction angle (φ)—in tandem with increased LBK content and curing duration. The optimal mixture (18% LBK, 8% AE, and 14 days of curing) showed a significant rise in c from 79.46 kPa to 150.88 kPa and φ from 14.3° to 24.0°, indicating a synergistic interaction between the asphalt binder and pozzolanic compounds. SEM analysis confirmed the formation of a denser and more cohesive matrix, attributed to both the physical encapsulation effect of AE and the pozzolanic reaction products, particularly calcium silicate hydrate (C–S–H) and calcium aluminate hydrate (C–A–H), which enhanced interparticle bonding. These findings underscore the effectiveness and urgency of adopting AE–LBK stabilization as a cost-efficient and environmentally friendly alternative for improving expansive soils. The study provides a foundational basis for field-scale implementation and long-term performance assessment in infrastructure development on marginal ground.
Engineering Behaviour of Clay Shale Stabilized with Asphalt Emulsion and Artificial Lightweight Aggregate Perlite Naess, Victor Firstkiel Feber
Jurnal Sosial Teknologi Vol. 5 No. 6 (2025): Jurnal Sosial dan Teknologi
Publisher : CV. Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsostech.v5i6.32213

Abstract

Soil plays a vital role in the planning stage of road construction. The subgrade, representing the final construction that receives the vehicle load transmitted by the pavement, is of critical importance. Clay shale is among the most challenging soil types due to its susceptibility to weathering when exposed to water or air. In the wake of geotechnical challenges precipitated by clay shale soil, there arises a pressing need for soil stabilization initiatives aimed at enhancing the soil's physical properties. The present study utilizes two stabilization materials: asphalt emulsion and artificial light weight aggregate perlite. The initial soil physical properties and mechanical properties (Unconfined Compressive Strength Test) were obtained through laboratory testing. Preliminary findings from rigorous testing and in-depth analysis have yielded notable results. The highest ultimate unconfined compressive strength value, as determined by a 14-day curing period with an asphalt content of 8% and an artificial light weight aggregate of 1%, has been recorded at 2,301 kg/cm2.
Co-Authors Hamdhan, Indra Noer Oktofani, Khansa Nuansa Syahril Syahril