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All Journal Astonjadro JPTE: Jurnal Pendidikan Teknik Elektro Makara Journal of Technology Al-Amal: Jurnal Manajemen Bisnis Syariah
Wiwik Rahayu
Universitas Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Journal : Astonjadro

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The Influence of Initial Conditions on the Swelling Potential and Swelling Pressure of Cikarang's Expansive Soil Simanjuntak, Murydrischy Panatap; Rahayu, Wiwik
ASTONJADRO Vol. 14 No. 3 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i3.18827

Abstract

Expansive soil can cause damage to simple constructions such as roads and houses with loads less than 20 kPa. Damage occurs due to the swelling behavior of expansive soil, due to changes in the moisture content of the soil. This research aims to determine the impact of the percentage of swelling potential and swelling pressure on expansive soil in the Delta silicon, West Java. This expansive soil is known to have very high swelling potential criteria. The samples used had variations in moisture content of 27% and 32%, with variations in initial stress of 16 kPa, 36 kPa, 38 kPa, and 42 kPa. The deformation that occurs due to swelling shows that all samples will continue to increase swelling for 4320 minutes (3 days). The results on the value of swelling potential and swelling pressure are influenced by water content. When a sample with a water content of 27% was compressed with a initial stress of 36 kPa, the swelling potential value increased by a maximum of 11%, and the maximum swelling pressure value was 913 kPa. These test results confirm the presence of very high soil swelling in the test area located in the silicon delta. The results of identification and swelling tests in the laboratory show that the development potential value of this land is high, which causes a high level of damage to simple construction.
Soil Improvement Using Bamboo Leaf Ash and Cement on Triaxial UU Testing Azana, Shafira Yuli; Rahayu, Wiwik; Sagitaningrum, Fatiyah Hakim; Kabidiyono, Era Agita
ASTONJADRO Vol. 15 No. 1 (2026): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v15i1.20727

Abstract

Soft soils, particularly those classified as low-plasticity silt (ML) according to ASTM D2487, pose considerable challenges in geotechnical engineering due to their low shear strength, high compressibility, and limited bearing capacity. This study evaluates the effectiveness of bamboo leaf ash (BLA), Portland Composite Cement, and their combination as stabilizing agents for ML-type soft soil. Laboratory investigations were conducted to assess changes in physical and mechanical properties, including Atterberg limits, specific gravity, compaction characteristics, and unconsolidated undrained (UU) triaxial shear strength. Four stabilization mixtures were analysed: untreated soil, soil with 10% BLA, soil with 5% cement, and a mixture of soil with 10% BLA and 5% cement. The results indicate that BLA alone enhances the internal friction angle from 11.03° to 38.84°, primarily through physical densification, but reduces cohesion from 64.49 kPa to 46.12 kPa. Cement treatment increases both cohesion 55.38 kPa and the friction angle 49.16° due to hydration and the formation of a cementitious bond. The combination of 10% BLA and 5% cement yielded the highest cohesion 102.59 kPa and a friction angle of 31.79°, highlighting the synergistic effect of pozzolanic reactions between reactive silica in BLA and calcium compounds from cement hydration. The study concludes that the BLA–cement mixture significantly improves the mechanical behaviour of soft silty soil, offering a sustainable and effective alternative to conventional soil stabilization methods, particularly when supported by controlled parameters such as ash fineness, burning temperature, and curing duration.
Co-Authors Agustina, Sintha Dewi Arinda Frismelly Azana, Shafira Yuli Bahsan, Erly Kabidiyono, Era Agita Marthanty, R.R. Dwinanti R. Muhatdin, Muhtadin Ontowirjo, Budianto Permani, Winarsi Asi Rudi Mulya Sagitaningrum, Fatiyah Hakim Sari, Fenti Amelia Simanjuntak, Murydrischy Panatap Soepandji, Budi Susilo