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All Journal Jurnal Konstruksia Briliant: Jurnal Riset dan Konseptual Teras Jurnal Jurnal Pensil : Pendidikan Teknik Sipil International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Firmansyah, Yerry Kahaditu
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Transportation Other

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Effect of Fosroc Cebex-100 and Fly Ash Stabilization on the Microstructural Properties of Soft Soil Farichah, Himatul; Firmansyah, Yerry Kahaditu; Puspitasari, Nia Dwi; Damayanti, Apta Kania
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.133

Abstract

This study investigates the microstructural effects of stabilizing soft soil using fly ash and Fosroc Cebex-100. The soft soil used in this study was collected from the construction site of the Northern Ring Road (JLU) Section 1 in Lamongan regency. Firstly, a series of laboratory soil test was performed to obtain the index properties of the soil sample including unit weight, specific gravity, Atterberg’s limits, optimum moisture content, and maximum dry unit weight. The soil was then treated with three variations of fly ash (20%, 25%, and 30%), while the Fosroc Cebex-100 dosage was held constant at 0.45% of the fly ash weight. A CBR test indicated that a 20% fly ash and Fosroc Cebex-100 mixture achieved the highest CBR value. Consequently, this optimal mix was selected for SEM-EDX (Scanning Electron Microscopy - Energy-Dispersive X-ray Spectroscopy) analysis to further examine microstructural characteristics. Additional fly ash and Fosroc Cebex-100 to the soft soil will influence the microstructural properties of the soil. SEM analysis show that addition of fly ash and Fosroc Cebex-100 results in significant changes in the soil matrix, including increased particle bonding, reduced porosity, and a denser overall structure. Moreover, the addition of fly ash and Fosroc Cebex-100 contribute to the presence of iron (Fe) in the treated soil.
PENGARUH FLY ASH DAN FOSROC CEBEX-100 TERHADAP SIFAT MEKANIK TANAH LUNAK YANG DISTABILISASI Rahma, Farah Salsabila; Firmansyah, Yerry Kahaditu; Farichah, Himatul
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.50625

Abstract

The problem of soft soil in infrastructure, specifically in road construction, will cause ongoing issues due to the nature of soft soil, which often undergoes shrinkage and swelling, potentially leading to failure in the structures above it. The solution of stabilizing the soil using chemical methods while also utilizing waste that is harmful to the environment has become very common, such as the use of fly ash material. This research focuses on the stabilization of soft soil using two stabilizing materials, namely fly ash and fosoc cebex-100, to improve the strength of problematic soil so that it can support the load of the construction above it. Fly ash was added  at 20%, 25%, and 30% of soil weight, and Cebex-100 at 0,45% of fly ash weight. The sample variations were subjected to physical tests, including Unconfined Compression Tests and shear strength tests, to determine the changes in physical and mechanical properties that occurred after the addition of the additives. The research results obtained from the unconfined compressive strength and elastic modulus parameters showed an improvement as the fly ash composition increased. The soil shear strength test identified 25% fly ash as the optimum variation, resulting in a cohesion value of 34.49 kN/m² and a friction angle of 7.66°. It can be concluded that the addition of fly ash and cebex-100 to problematic soil conditions can improve the physical and mechanical properties of the soil.
Pengaruh Beban Gempa Terhadap Stabilitas Lereng Dengan Perkuatan Dinding Penahan Tanah Tipe Kantilever Ramadhan, Arya Galih; Firmansyah, Yerry Kahaditu; Farichah, Himatul
Konstruksia Vol 16 No 2 (2025): Jurnal Konstruksia Vol 16 No. 2 Tahun 2025
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.16.2.107-117

Abstract

Indonesia merupakan negara dengan tingkat kerentanan tinggi terhadap gempa bumi akibat posisinya pada zona pertemuan tiga lempeng tektonik utama. Salah satu wilayah yang terdampak adalah Tulungagung, Jawa Timur, yang menjadi lokasi proyek pembangunan Jalan Lintas Selatan Lot 1A pada segmen STA 4+550. Pada lokasi ini, terdapat lereng di sisi bawah bahu jalan yang diperkuat menggunakan dinding penahan tanah tipe kantilever. Penelitian ini bertujuan untuk menganalisis pengaruh beban gempa terhadap stabilitas lereng yang diperkuat dengan dinding penahan tanah tipe kantilever tersebut. Analisis stabilitas lereng eksisting dilakukan secara manual, kemudian untuk dengan beban gempa dilakukan menggunakan program bantu GeoStudio. Parameter tanah yang digunakan diperoleh dari hasil uji borelog yang kemudian dikorelasikan berdasarkan standar korelasi dari Kementerian Pekerjaan Umum dan Perumahan Rakyat dan buku oleh Das. Hasil analisis menunjukkan bahwa pada kondisi tanpa beban gempa, lereng eksisting memiliki faktor keamanan yang memenuhi persyaratan SNI 8460:2017, yaitu potensi penggulingan, penggeseran, dan keruntuhan daya dukung masing-masing mendapatkan nilai sebesar 4,93; 6,04; dan 9,72. Namun, setelah mempertimbangkan beban gempa dengan nilai percepatan tanah maksimum (PGA) sebesar 0,4643g dan percepatan gempa terkoreksi (PGAM) sebesar 0,557g, faktor keamanan global lereng menurun menjadi 0,891, yang mengindikasikan nilai angka keamanan bawah batas minimum yang dipersyaratkan sebesar 1,1. Hal ini menunjukkan bahwa lereng tidak aman terhadap beban gempa dan diperlukan evaluasi terhadap desain dinding penahan tanah tipe kantilever untuk memastikan stabilitas lereng sesuai standar keamanan yang berlaku.  Dilakukan penambahan geotekstil pada area timbunan menghasilkan peningkatan nilai faktor keamanan terhadap beban gempa, dari 0,897 menjadi 1,186. Peningkatan ini mengindikasikan bahwa lereng tersebut telah memenuhi persyaratan keamanan terhadap beban gempa sebagaimana ditetapkan dalam standar, yaitu dengan nilai minimum sebesar 1,1.
Stabilisasi Tanah Lunak Menggunakan Geopolimer untuk Meningkatkan Nilai CBR Subgrade Prasetyo, Querida Addisty; Firmansyah, Yerry Kahaditu; Farichah, Himatul
BRILIANT: Jurnal Riset dan Konseptual Vol 10 No 3 (2025): Volume 10 Nomor 3, Agustus 2025
Publisher : Universitas Nahdlatul Ulama Blitar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28926/briliant.v10i3.2030

Abstract

Clay soil is a type of cohesive soil with low bearing strength, so it requires improvement through a stabilization process. The aim of this research is to identify changes in the physical and mechanical properties of soil with the addition of geopolymer composed of fly ash and alkali activator. The case study in this research is the Lamongan STA 1+270 northern ring road project. The geopolymer variation used consists of fly ash with percentages of 10%, 15% and 20%, with alkali activator sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) 8M with a ratio of 1:1. The test method applied in this research involves testing physical and mechanical properties, including measuring water content, specific gravity, Atterberg limit, plasticity index, and California bearing ratio (CBR) in the laboratory. This research shows that the addition of 15% fly ash and alkali activator provides the most optimal CBR value of 8.23%, an increase from the original soil CBR value of 5.87%. This CBR value indicates that the addition of geopolymer to soft soil can improve the characteristics of the soil. This research concludes that the use of geopolymer can improve the quality of clay soil.
COMPARATIVE ANALYSIS OF ANALYTICAL RATIONAL METHOD IN CALCULATING BEARING CAPACITY OF PILE FOUNDATION BASED ON N-SPT DATA AGAINST CAPWAP TEST RESULTS PDA Nawawi, Al Firdaus; Firmansyah, Yerry Kahaditu; Farichah, Himatul
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.53509

Abstract

This research aims to analyze the comparative value of analytical rational methods in calculating the bearing capacity of pile foundations based on N-SPT data. The results of calculating the bearing capacity of pile foundations by analytical methods (Luciano Decourt & Quaresma, Meyerhof, Nakazawa, Terzaghi & Peck, Reese O'Neil, and Vesic & Tomlinson) will be compared to the results of CAPWAP analysis of PDA (Pile Driving Analyzer) tests. The results of this study show that the Meyerhoff (1956) method provides the highest tip bearing capacity values, while the Nakazawa (2000) method produces the highest blanket bearing capacity and total bearing capacity values compared to other methods. Comparison of the ratio of total bearing capacity to CAPWAP showed a range of values from 0,82 to 1,64 with the Terzaghi & Peak (1948) methods providing the highest ratio. The methods with the smallest to largest average comparison values are Nakazawa (2000), Meyerhoff (1956); Luciano Decourt (1982) & Quaresma (1978); Vesic (1977) and Tomlinson (1977); Reese O'neil (1999); Terzaghi & Peak (1948) with average comparison values against CAPWAP of 0.81; 0.88; 1.14; 1.56; 1.57; 1.64 respectively. The comparison of the total bearing capacity of the analytical method to the CAPWAP analysis that is closest to 1 is the Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) method. Therefore, the most effective analytical methods in calculating the total bearing capacity of piles are Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) methods.
Kajian Dewatering Sebagai Metode Darurat Pengairan Saluran Sekunder di Gumbasa, Sulawesi Tengah Firmansyah, Yerry Kahaditu; Trilita, Minarni Nur
Teras Jurnal : Jurnal Teknik Sipil Vol. 13 No. 2 (2023): Volume 13 Nomor 2, September 2023
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v13i2.947

Abstract

Abstrak Sebagai negara agraris, masyarakat Indonesia banyak menggantungkan hidupnya pada sektor pertanian. Dalam pertanian, irigasi sangatlah penting untuk memastikan hasil tani sekaligus mengembangkan sektor pertanian. Untuk itu, Daerah Irigasi Gumbasa, Palu, Sulawesi Tengah dilakukan rehabilitasi di saluran primer. Namun saat proses rehabilitasi berjalan, saluran sekunder ke bawahnya tetap memerlukan aliran air irigasi agar tidak mengganggu pertanian yang dialirinya. Oleh karenai itu direncanakan untuk digunakan metode dewatering sebagai metode pengairan darurat. Metode dewatering jamak dilakukan pada pekerjaan konstruksi. Namun, karena metode tersebut belum pernah digunakan pada keperluan irigasi, maka perlu untuk dikaji secara mendalam. Dalam kajian ini akan dihitung jumlah sumuran yang diperlukan dan seberapa lama untuk memenuhi debit yang dibutuhkan dalam sehari. Hasil dari kajian tersebut adalah metode dewatering tidak sesuai untuk kegunaan darurat pengairan saluran irigasi karena jumlah sumuran yang diperlukan mencapai ribuan, sehingga perlu dilakukan kajian metode lain untuk memenuhi debit saluran sekunder tersebut. Kata kunci: Dewatering, Irigasi, Saluran Sekunder, Rehabilitasi, Pertanian   Abstract As citizens in an agricultural country, most Indonesians depend on the agricultural sector for their livelihood. Irrigation is crucial to ensure farming yields while developing the agricultural sector. For this reason, the Gumbasa Irrigation Area, Palu, Central Sulawesi, is rehabilitating the primary channel. However, during the rehabilitation process, the secondary channels still need irrigation water flow so as not to interfere with the agriculture it flows through. Therefore, it was planned to use the dewatering method as an emergency irrigation method. The dewatering method is commonly used in construction works. However, since the method has never been used for irrigation purposes, it needs to be studied. The study will calculate the number of wells required and how long it takes to fulfil the required discharge in a day. The result of the study is that the dewatering method is not suitable for irrigation purposes because the number of pits required is in the thousands, so it is necessary to study other methods to fulfil the secondary channel discharge. Keywords: Dewatering, Irrigation, Secondary Channel, Rehabilitation, Agriculture
Co-Authors Damayanti, Apta Kania Nawawi, Al Firdaus Nia Dwi Puspitasari Prasetyo, Querida Addisty Rahma, Farah Salsabila Ramadhan, Arya Galih