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All Journal Jurnal SOLMA JURNAL PENDIDIKAN TAMBUSAI Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Jurnal Teknik Sipil Anggapa Jurnal Basement : Jurnal Teknik Sipil Sinergi Akademisi dan Masyarakat PRESUNIVE CIVIL ENGINEERING JOURNAL
Darmiyanti, Lydia
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Effect of Salt Solution in Electrochemical Stabilization with Variation of Potential Difference on Clay's Shear Strength Darmiyanti, Lydia; Wiharja, Ujang
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5434

Abstract

Clay is one of the problematic soils in Indonesia, with a distribution in Java of close to 20% of surface pedology. The biggest problem with clay soil is its ability to swell when it absorbs water and shrink when the water content decreases. Indonesia's tropical climate, where only the rainy and dry seasons, significantly affects clay's swelling potential, hindering the soil's mechanical properties. The significant expansion potential causes the soil to have a slight shear angle, which affects its bearing capacity. This condition underlies the urgency of clay soil improvement to increase the shear strength of the soil. Electrochemical stabilization is one of the effective methods for soils with low permeability. This study aimed to determine the most optimum voltage in electrochemical stabilization using a salt solution. The electrochemical process is used in soil stabilization. This method is used to improve soils with low permeability and high plasticity index (18%), which results in increased bearing capacity and decreased soil development. This study was conducted with four different stress scenarios, and from the results of testing the mechanical properties of the soil, it was found that the greatest shear strength occurred at a stress of 12V. Stabilization of clay soil by electrochemistry can be inferred from the research to increase the value of soil shear strength and affect the increase in soil bearing capacity.
Penerapan Manajemen Waktu Menggunakan Metode Jalur Kritis (CPM) Nazil, Endah Assa Nanzila; Darmiyanti, Lydia
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Seiring berkembangnya industri manajemen konstruksi, kesulitan dalam mengelola proyek konstruksi pun semakin meningkat. Proyek yang lebih kompleks membutuhkan waktu lebih lama untuk diselesaikan. Kegagalan proyek dikarenakan perencanaan yang buruk atau manajemen yang tidak efektif, yang dapat menyebabkan penundaan, kualitas pekerjaan yang buruk, dan peningkatan biaya. Sesuai metodologi penelitian tugas akhir ini, Proyek Pembangunan Gedung Proklamasi Jakarta akan menjadi objek penelitian. Dalam penelitian ini, program aplikasi Microsoft Project 2019 digunakan untuk melakukan analisis nonlinier. Berdasarkan hasil analisis, metode jalur kritis mencakup 5 pekerjaan yaitu : Pekerjaan Persiapan, Pekerjaan Elektronik, Pekerjaan Mekanikal Ventilasi, Pekerjaan Lift dan Escalator, dan Pekerjaan Gondola. Kontraktor menggunakan manajemen waktu yang tidak sesuai dengan jadwal Proyek Pembangunan Gedung Proklamasi Jakarta. Proyek Pembangunan Gedung Proklamasi Jakarta dijadwalkan memakan waktu 366 hari, namun selesai dalam 511 hari. Artinya proyek tersebut tertunda selama 145 hari.
Effect of Electrokinetic Soil Improvement on CBR Value of Expansive Clay Darmiyanti, Lydia; Imanuel, Ivan; Prihartono, Prihartono
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol 3, No 1 (2025)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v3i1.5881

Abstract

Improvement of low permeability soils with high plasticity index and high shrinkage expansion cannot be done by soil compaction or consolidation. The structure of expansive clays is influenced by the history of soil formation. Expansive soil structure is composed of two tetrahedra with one octahedron. Van der Waals bonds bind them together. Kolinite, illite, and montmorillonite are minerals in expansive soils. Montmorillonite has the weakest bond of the others so that other elements can easily enter the clay structure and bind to it. The ability of clay soil to absorb water or other minerals that come close is due to its cation exchange capacity (CEC). Clay, with its negative ions, will attract positive ions that approach the soil surface. Water with H+ content will easily enter into the structure of the clay soil, bond with it, and cause the soil to swell.Electrokinetic soil improvement is effective on clay soils. With the nature and characteristics of clay soil, positively charged stabilizing ions are required. Positive ions will enter due to the CEC process and affect the mineral content of the soil, thereby improving the physical and mechanical properties of the clay soil. Therefore, this research needs to be conducted to improve clay soil using the electrokinetic method with a calcium dioxide solution. An increase in the Bearing Capacity Ratio (CBR) value occurred after being improved by electrokinetics using four variations of voltage application.The variation of applied voltage gives different results to the change of soil mechanical properties. The original soil CBR of 0.093% increased for all stress applications. The optimum CBR value occurred in the soil applied with 15V. The resulting CBR increase reached 200% of the original soil CBR.
ANALISIS ELEMEN VERTIKAL PADA BANGUNAN SEKOLAH KHUSUS OLAHAGA CIBUBUR MENGGUNAKAN METODE RESPONSE SPECTRUME Amini, Aina Riva; Darmiyanti, Lydia; Rodji, Achmad Pahrul
Jurnal Anggapa Vol 4 No 2 (2025): ANGGAPA Volume 4 No 2 November 2025
Publisher : Faculty of Engineering, Widya Kartika University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61293/anggapa.v4i2.847

Abstract

Earthquakes, caused by the movement of active tectonic plates, pose a real risk to infrastructure in Indonesia, especially in rapidly developing urban areas with high-rise building construction. Although the Cibubur area has a low earthquake risk based on SNI 1726:2019, earthquake impact analysis in construction design remains crucial. Many building collapses due to earthquakes are often caused by a lack of understanding of earthquake resistance principles in their design and implementation. Thus, in-depth structural analysis is crucial to ensure the building can withstand various types of loads, including dynamic loads due to earthquakes. This study aims to analyze the vertical components of the Cibubur Special Sports School Building using the Response Spectrum Analysis method. The specific objectives are to measure the values ??of shear forces and displacements in columns due to earthquakes, as well as the comparison of column reinforcement. Data were collected through literature review and technical data collection such as shop drawings. The analysis conducted using ETABS V.18.1.1 software showed that the highest shear forces in the second-floor columns reached 1615.402 kN (X direction) and 1482.65 kN (Y direction). The current displacement caused by the earthquake is 309,071 mm (X-direction) and 285,402 mm (Y-direction). The K1 column reinforcement ratio of 2.47% is within the limits permitted by SNI 2847-2019. This study is expected to provide insight into the structural response to earthquake loads, assist in determining the feasibility and safety of buildings, and prepare for reinforcement needs.
Consolidation Analysis Using Preloading Combined with Prefabricated Vertical Drain At The Jakarta Cikampek II Selatan Phase II A Siregar, Raihan Fauzan; Bangkara, B.M.A.S. Anaconda; Darmiyanti, Lydia
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol 4, No 1 (2026)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v4i1.6684

Abstract

The Jakarta–Cikampek II Selatan Phase II A toll road construction project on the STA 16+100–16+300 segment is faced with soft subgrade soil conditions identified through Dutch Cone Penetration Test results. These conditions can cause excessive settlement in the long term if not addressed, thus requiring effective soil improvement methods to accelerate the consolidation process. The commonly used repair method is preloading combined with Prefabricated Vertical Drain (PVD), because PVD functions to shorten the flow path of soil pore water, thereby accelerating the consolidation process. The analysis results show that the settlement that occurred is 0.31 m at STA 16+125 and 0.22 m at STA 16+250. The results of the preloading analysis without using Prefabricated Vertical Drain show that the time required to achieve 90% consolidation at STA 16+125 is 6.39 years with a settlement of0.28 m, and at STA 16+250, the time required is 5.60 years with a settlement of 0.20 m. Then, using the Prefabricated Vertical Drain combination preloading method, the time required to achieve 90% consolidation at STA 16+125 with a triangular pattern and a distance variation of 0.6-1.5 m is 2-13 days with settlement of 0.28-0.30 m, while with a square pattern with the same distance, the time required is 2-15 days with a settlement of 0.28-0.29 m. At STA 16+250, the time required to achieve 90% consolidation with a triangular pattern and a distance variation of 0.6-1.5 m is 7-53 days with settlement of 0.20 m, while with a square pattern with the same distance, the time required is 8- 61 days with settlement of 0.20 m.
Expansive Soil Shear Strength Improvement using Hydrated Lime : Direct Shear Analysis Sanggam, Yoel Kevinmorgan; Sudjatmiko, Eddy Triyanto; Darmiyanti, Lydia
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol 4, No 1 (2026)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v4i1.6571

Abstract

Low shear force in expansive soil caused landslide, crack, and damage to construction. Successful treatment of expansive clay will increase its shear strength and improve its soil properties, making the soil less susceptible to deform thus making construction can be done without the need to replace the expansive soil. This study aims to quantify the effect of adding hydrated lime,  to the Karawang's expansive clay soil, especially its effect on increasing the shear strength of the soil. Laboratory test was consists of sieve analysis; Atterberg limit test, soil classification, and direct shear test was performed on untreated soil and soil treated with 5% of hydrated lime. The study results shows that addition of 5% hydrated lime to expansive clay can significantly improve its Atterberg limit and shear strength. The cohesion,  value of brown clay increases from 6.49 kPa to 61.43 kPa while for grey clay from 22.49 kPa to 55.49 kPa. The internal friction angle,  of treated clay are also improved significantly, from 15.07° to 28.30° for the brown clay and gray clay increase from 18.75° to 24.97°. This experiment proved that soil treated with lime is able to improve the shear stress of expansive soil especially expansive clay, making it a practical and viable alternative to soil replacement by backfilling expansive clay. 
Co-Authors Albiruni, Brillian Ali Khumaidi Amini, Aina Riva Asy’ari, Gilang Maulana B.M.A.S. Anaconda Bangkara Gali Pribadi Gita Puspa Artiani, Gita Puspa Herawati, Susetya Ikhwan, Bima Khairul Indriasari Ivan Imanuel, Ivan Juniati S, Kristina Laura Nantania, Virla Loen, Mishelei Lu’ul Chusna S, Nuke Munaroh, Hulatal Nazil, Endah Assa Nanzila Nini Boro, Marselina Paramita, Yuaniko prihartono prihartono Rahayu, Tuntun Rodji, Achmad Pahrul Sanggam, Yoel Kevinmorgan Siregar, Raihan Fauzan Sitompul, Meydina H Situmorang, Hendrik Kristian Sudjatmiko, Eddy Triyanto Sutaryo Tahismasari, Santy Wiharja, Ujang Yessy Kusumadewi