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All Journal International Journal of Applied Power Engineering (IJAPE) PROSIDING SEMINAR NASIONAL Tadulako Journal Sport Sciences And Physical Education Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain DINAMIKA Jurnal Ilmiah Teknik Mesin REFLEKSI EDUKATIKA Terampil : Jurnal Pendidikan dan Pembelajaran Dasar UNM Geographic Journal Jurnal Environmental Science Civil and Environmental Science Journal (CIVENSE) Islamic Management: Jurnal Manajemen Pendidikan Islam IKRA-ITH ABDIMAS Holistika : Jurnal Ilmiah PGSD Jurnal Teknodik Edukids: Jurnal Pertumbuhan, Perkembangan, dan Pendidikan Anak Usia Dini JURNAL PENDIDIKAN, SAINS DAN TEKNOLOGI Al'adzkiya International of Education and Sosial (AIoES) Journal juremi: jurnal riset ekonomi Jurnal Ranah Publik Indonesia Kontemporer (Rapik) Pedagogy : Jurnal Pendidikan Matematika PENANOMICS: INTERNATIONAL JOURNAL OF ECONOMICS Seminar Nasional Insinyur Profesional (SNIP) JPNM : Jurnal Pustaka Nusantara Multidisiplin AN-NAS: Jurnal Pengabdian Masyarakat Jurnal Papeda: Jurnal Publikasi Pendidikan Dasar
Iswan Iswan
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Religion Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Pengaruh Penambahan Pasir Terhadap Tingkat Kepadatan dan Daya Dukung Tanah Lempung Organik Ferdi Ferdian; Muhammad Jafri; Iswan Iswan
Jurnal Rekayasa Sipil dan Desain Vol 3, No 1 (2015): Edisi Maret 2015
Publisher : Jurnal Rekayasa Sipil dan Desain

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The problem of density level and bearing capacity of soil is one of things that really need toconsidered in the planning and construction work of a civilian building . This is because the landin question serves as a medium that holds the load or the action of a construction that is built on it. Stabilization using sand material is one way to meet the needs of the required strength . Changesin weather and temperature in the field are factors that makes the soil unstable .The type of soil is organic clay stabilized from the Gedong Pasir village, Jabung District, EastLampung District. This research was conducted by using a mixture of sand with variations mixtureof 5 %, 10 % and 15 %. After the CBR testing, Density, Atterberg Limits and Specific Gravity foreach sample.The more variations of a mixture of sand were added resulting in declining water levels that wouldmake the value of the soil carrying capacity increases, the value of density and plastic limitincreased, while the value of the liquid limit and plasticity index decrease.Keywords: sand, organic clay, bearing capacity
Hubungan Batas Cair dan Plastisitas Indeks Tanah Lempung yang Distabilisasi dengan ISS 2500Terhadap Nilai Kohesi pada Uji Geser Langsung dan Uji Tekan Bebas Markus Manik; Iswan Iswan; Muhammad Jafri
Jurnal Rekayasa Sipil dan Desain Vol 3, No 2 (2015): Edisi Juni 2015
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Along with the times, human need a better means and facilities. This make human have no choicebut to build a building or civil structure upon improper area, for example, build it on clay area.The clay is a cohesive soil which often undergoing a swelling-shrinking event in its subgrade. So,it needed to to carried out the stabilization, one of which is using ISS 2500, and research of liquidlimit and plasticity index to know about their relationship with its cohesion in-depth study.Thesample was taken from Margakaya village and Palputih village, District of Jati Agung, SouthLampung and Blimbing Sari village, District of Jabung, East Lampung. The soil tested at originalcondition and mixed by ISS2500 with three variation of mixture, that is at 0,6 ml, 0,9 ml, and 1,2ml. Mixing is conducted based on optimum moisture content of each kind of soil. Mechanicaltesting which is unconfined compressive test and direct shear test, using three sample for everysoil and every mixture variation.Test result show that the more volume of solution added into soil1, soil 2 and soil 3, then it will increase value of soil cohesion (c), maximum stress (qu). Mixing ofthe ISS 2500 resulted liquid limit (LL) of clay be between 42% - 47% .Keywords: cohesion, direct shear test, liquid limit, plasticity index, unconfined compressive test
Perubahan Nilai Daya Dukung Tanah Lempung Lunak Akibat Stabilisasi Tanah menggunkaan Metode Deep Soil Mixing Pola Panels dengan Kapur 8% Salsabila Atalia Sadil; Iswan Iswan; Aminudin Syah
Jurnal Rekayasa Sipil dan Desain Vol 9, No 2 (2021): Edisi Juni 2021
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Palembapang, South Lampung requires proper road construction for public transportation needs. However, the road conditions in the village were found heavily damaged because of poor soil conditions. Therefore, soil stabilization must be carried out. The method of this study is deep soil mixing (DSM), which is soil improvement method by mixing additional materials in the field (in-site). This method is more affordable because they use their soil as theiraggregate and reduce the transportation budget because of stuff supply.The purpose of this study is to determine the change of soil load-bearing capacity due to the variation of distance and the diameter of the DSM stabilization column on soft clay soil and soft clay soil with 8% lime. This study shows that the stabilization of soft clay soil with 8% lime has increased its load-bearing capacity (qu) from 10.368 kg/cm2to 14.69 kg/cm2. The increase of soil load-bearing capacity with the stabilization of the DSM column is proportional to the volume of soil improvement. The largest increase of the soil load-bearing capacity occurred in 1D columns range and 3.75 cm diameter. The distance variation also gives a more significant change compared to the variation of diameter. The most efficient distance and diameter are at the variation of the distance of 1.25D columns range and 2.5 cm diameter.
Pengaruh Variasi Waktu Perendaman Terhadap Daya Dukung Tanah Lempung Dan Lanau Yang Distabilisasi Menggunakan Semen Alward Farabi; Setyanto Setyanto; Iswan Iswan
Jurnal Rekayasa Sipil dan Desain Vol 5, No 1 (2017): Edisi Maret 2017
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Abstract

Soil is the material that serves as a support for the construction base. Each region has different soil characteristics in other areas, there has a carrying capacity of good to bad or poor. Clay and silt soil has a bearing capacity and low soil properties. To overcome this, the need to improve the soil natures with the stabilization method. Stabilization is to improve the physical and mechanical properties of the soil so that it meets certain technical requirements. One way is with a cement stabilization. In this study, the cement used is a cement-type portland cement. This study aimed to compare the value of CBR clay and silt before and after stabilized by the addition of cement and given soaking treatment. Soil used is a type of clay taken from the village of Rawa Sragi, District Jabung, East Lampung district and silt types from  Yosomulyo Village, East Metro District, Metro City. In CBR soaking test with mixture of 9% cement with modified proctor compaction and cured for 28 days, CBR values decrease to 28,7% for clay that soaked for 28 days, while the CBR value for silt soil with the same condition descease to 37,8%. The soaking treatment is proven to decrease the value of CBR significantly compared with the optimum condition of both soil.
Pengaruh Fraksi Lempung Terhadap Nilai Kohesi dan Indeks Plastisitas Renold Pangidoan Rambe; Lusmeilia Afriani; Iswan Iswan
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
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This study aims to see the influence the fraction of clay in the sand by comparing parameters ofstrong shear soil that is resulted from unsoaked and soaked conditions of Direct Shear Test andAtterberg Limit. An increase in the fraction of clay in the sand can change the physical propertiesof the soil and the mechanical properties. An increase in the fraction of clay can also improve thevalue soil cohesion and ground plasticity index but it reduces the value soil friction. Theparameter change magnitude is analyzed by looking at the results of correlation analysis ofcohesion of the soil plasticity index, and some of the physical parameters of the soil. Thecorrelation between the shear test directly with the plasticity index against the physical propertiesof soil clays that linear regression obtained a very strong correlation (0.8 – 1) and limit land thatis used are sand which is already substituted by clays from 0% – 50%.Direct shear test which results from the condition of unsoaked conducted in the laboratoryobtained that addition levels of clay showed an increase in the value of cohesion but the angleshear declined. Direct shear test results from the condition of soaked (soaking 4 days) obtained adecrease of the value of cohesion (c) down and slide angle (φ) which is also affected by soakingthe soil. The test results show the Atterberg limits that a percentage of the original soil andaddition of clays to 20% has no plasticity index value. This is because the ground is still are off(loose soil). As for the addition of clays from the percentage of 30%, 40%, and 50% of the land isincluded soil cohesive and value each PI is 8.87%, 17.7%, and 12.04%.Keywords: direct shear, cohesion, plasticity index
Studi Perbandingan Uji Pemadatan Standar dan Uji Pemadatan Modified Terhadap Nilai Koefisien Permeabilitas Tanah Lempung Berpasir Natanael Sembiring; Iswan Iswan; Muhammad Jafri
Jurnal Rekayasa Sipil dan Desain Vol 4, No 3 (2016): Edisi September 2016
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AbstractConstruction of a construct in civil engineering requires that the material in top shape.The soil that became the foundation of a structure should reach the prime condition to be able to sustain the existing structure on it. But in fact it is not easily met at a project site . This research will compare the compacted soil permeability values are standard with compacted soil permeability values are modified. Soil of the sample in this study were taken from the  sukajawa village , Lampung Tengah. The soil was taken from two locations with different types. The soil is then mixed with sand which then compacted using standard methods and methods modified. Permeability testing is done to obtain permeability coefficient. Based on the original soil physical test , AASHTO soil 1 put into groups of A - 7-5 and the second soil  into a group of A- 7-6, which means the land is clay soil types and USCS classify the soil into fine-grained soil. The observations in the laboratory showed that compaction with different methods show different results and the amount of a mixture of sand affects the value of soil density.Keywords : Soil clay , sand , compaction and permeability.  
Pengaruh Variasi Waktu Pemeraman Terhadap Nilai Uji Kuat Tekan Bebas pada Tanah Lempung dan Lanau yang Distabilisasi Menggunakan Kapur pada Kondisi Optimum Abdil Hafizh Arrofiq; Lusmeilia Afriani; Iswan Iswan
Jurnal Rekayasa Sipil dan Desain Vol 4, No 3 (2016): Edisi September 2016
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In this study used raw material such as silt and clay soil with a mixture of lime additive which has a variety of levels of 5%, 10%, and 15% as well as with a variety of curing time for 7 days, 14 days and 28 days.The purpose of this study to increase the compressive strength of silt and clay soil free them. Soil samples tested in this study represents silt soil from the village Yosomulyo, East Metro District, Metro City, while the clay is derived from Rawa Sragi, Jabung District, East Lampung regency.After doing research, from the third level, the compressive strength maximum free of silt and clay soil found in the levels of 15% with 28 days curing time. This is due to the greater levels of lime and the longer the curing time, the greater the unconfined compression value.Keywords: Clay Soil, Silt Soil, Unconfined Compression, lime.
Pengukuran Aktivitas Subgrade Jalan Terhadap Nilai Daya Dukung Yang Disubtitusi Material Pasir Dani Aprizal; Iswan Iswan; Rahayu Sulistyorini
Jurnal Rekayasa Sipil dan Desain Vol 8, No 4 (2020): Edisi Desember 2020
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Umumnya kerusakan pada perkerasan jalan disebabkan tanah dasar pada perkerasan jalan memiliki daya dukung tanah yang buruk, hal ini dikarenakan sifat tanah yang berpotensi mengalami pengembangan tanah akibat dari faktor cuaca dan lingkungan. Oleh sebab itu, perlu dilakukannya perkuatan pada tanah tersebut, salah satunya menggunakan materialpasir. Pada penelitian ini sampel tanah yang digunakan berasal dari Ruas Jalan R.A.Basyid, Kecamatan Jati Agung, Lampung Selatan pada STA 3+100 dan variasi pasir yang digunakan yaitu 0, 5, 10, & 15 % dari berat tanah. Pengujian yang dilakukan adalah pengujian CBR dari efek pegembangan tanah, lalu berdasarkan hasil pengujian tersebut, dilakukan perhitungan tebal perkerasan dengan metode analisa komponen SKBI 2.3.26.1987. Tanah pada penelitian ini termasuk kelompok A-7 atau jenis tanah yang buruk. Nilai aktivitas tanah pada setiap penambahan pasir 0%, 5%, 10%, dan 15% berturut-turut yaitu 0,5920; 0,4612; 0,2961; dan 0,2177. Nilai aktivitas tanah menurun seiring dengan menurunnya fraksi lempung.Hubungan nilai aktivitas tanah dan sifat-sifat fisik tanah terganggu (disturbed) pada tiap persentase penambahan pasir dengan kadar 0%, 5%, 10%, dan 15% memengaruhi tebal perkerasan jalan yang direncanakan. Dan Hasil perhitungan tebal perkerasan yang paling efisien didapatkan pada sampel tanah dengan persentase +15% pasir dan nilai aktivitas tanah yang rendah yaitu 0,2177.
Menentukan Nilai CBR Menggunakan Alat DCP Dalam Grafik Dan Persamaan Fungsi Yupi Ardianto; Setyanto Setyanto; Iswan Iswan
Jurnal Rekayasa Sipil dan Desain Vol 5, No 3 (2017): Edisi September 2017
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Kekuatan tanah dasar memegang peranan penting dalam mendukung suatu konstruksi seperti; jalan, bangunan gedung , jembatan dan sebagainya. Dan untuk menilai kekuatan tanah dasar tersebut, dipergunakanlan nilai CBR (California Bearing Ratio). Tetapi seringkali di lapangan, karena keterbatasan transportasi pada daerah pedalaman dan ketersediaan alat pengujian yang cukup memadai, alat yang paling mudah untuk mendapatkan nilai CBR dari tanah dasar tersebut dapat digunakan alat Dinamic Cone Penetrometer (DCP). Dari data pengujian alat DCP tadi, dengan menggunakan fungsi logaritma tertentu sesuai dengan besaran sudut konus dari alat DCP, yaitu 30o atau 60o, yang kemudian digambarkan dalam grafik hubungan antara besaran penetrasi dan jumlah tumbukan, didapatlah besaran nilai CBR. Grafik hubungan yang digunakan adalah perumusan dari Smith dan Pratt, 1983 untuk sudut konus 300 dengan persamaan Log CBR = 2,503 – 1,15 (Log DCP), dan TRL, Road Note 8, 1990, untuk sudut konus 600 dengan persamaan Log CBR = 2,48 – 1,057 (Log DCP). Sebelumnya sudah ada, grafik hubungan DCP dan CBR, akan tetapi untuk menentukan nilai CBR yang dihasilkan, harus menggunakan cara diterawang menggunakan kertas lain, dan hal ini cukup menyulitkan jika titik yang diuji sangat banyak jumlahnya. Dengan perhitungan logaritma yang diaplikasikan ke grafik dan persamaan fungsi, diharapkan dapat mempermudah dan mempersingkat waktu yang dibutuhkan untuk mengolah data DCP yang diuji. Kata kunci : Tanah dasar, grafik DCP, hubungan DCP dan CBR, logaritma DCP
Pengaruh Subtitusi Pasir Pada Tanah Organik Terhadap Kuat Tekan dan Kuat Geser Rizki Dwi Putra; Iswan Iswan; Lusmeilia Afriani
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
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Physical properties of organic soils have a very high water content and low carrying capacity.One method to increase the carrying capacity of the soil is by adding or mixing with materials thathave a high carrying capacity. By adding sand on the sample in this study is expected to increasethe carrying capacity of organic soils of compressive strength and strong shear. The study wasconducted in the laboratory of Soil Mechanics Faculty of Engineering, University of Lampung, bymaking a sample of the results of compaction standard, then the samples are given the addition ofsand to the percentage increments of 5%, 10%, 15%, and 20% for the comparison of thecompressive strength (qu), shear angle (φ), and the value of cohesion (c) after the addition ofsand.Results of testing the compressive strength and shear strength showed soil behavior in a state ofthe sample with the addition of sand up to 20% has an increased qu and φ, but a decline in thevalue of soil cohesion. The more increasing mix of sand in the soil samples, the values ofcohesion / coherence on the ground will be more decreased, but the sand has good gradation andstrong grain will be able to withstand the load that works vertically or horizontally.Keywords: Organic Soil, Compressive strength and Shear strength, Friction Angle, and Cohesion.
Co-Authors Abdil Hafizh Arrofiq Achmad Satria Nursar Ade Setiawan Ahmad Zakaria Ahmad Zakaria Albertus Willy Pratama Aldy Fernanda Alward Farabi Amal Khairan Andius Dasa Putra Andius Dasa Putra Aswir Aswir Ati Kusmawati Aulia R Sudarman Ayu Ning Trias Pratiwi Badruzzaman Aji Bahar, Herwina Bahfen, Munifah Basuki Sri Hermanto Bravo Pandiangan Carissa, Caroline Clara Christian Prasenda Dani Aprizal DELLA ANDANDANINGRUM Desti Rahayu Devrisvansyah Irwan Dewi, Afini Riani Dhea Chandra Dewi, Dhea Chandra Dewi Diah Andika Sari Diah Larasati DIRGANTARA WICAKSONO Duha, Mayunata Faanzir, Faanzir Fatmi Riandini Fatria, Akhmad Ridho Ferdi Ferdian Fikri Alami Fikri Alami Fransiskus Afrie Hadi, Sofian Hadidah, Indah Handayani, Friska Hany Octavia Anggraini Happy Indira Dewi hardianto widyastomo Haryati Haryati Hatapayo , Abdul Aziz Hedi Saputra hermawan arbenta Husainah, Nazifah I Komang Tri Herdiana Ikratul Herman Imam Wahyudin Indah Parsianti Istikomah Istikomah Jafri, M. julian fahlefi Lusmeilia Afriami Lusmeilia Afriani Lusmeilia Afriani M Lucky Apriansyah Nawawi M. Fahmi Rinaldi M. Iqbal Hermawan Ma'rufi, Ma'rufi Markus Manik martha vepti dhina Mirsa Susmarani Muhammad Aldani Muhammad Ilyas Muhammad Jafri muhammad karami Muhammad Nur Kholiq Muhammad Rendi Ramdhani Natanael Sembiring Nawawi Nawawi NURWAHIDAH NURWAHIDAH Ofik Taufik Purwadi, Ofik Taufik Panca Kurniawan Prayitno, Irwan Putra Andrean A. Putri, Silfa Nayyira Rahayu Sulistyiorini Rahayu Sulistyorini Rahman, Muhammad Natsir Rasyid, Ramly Renold Pangidoan Rambe Restu Agusni Retno Primantiko Retno Wulandari Rian Alfian Riansyah Putra Rio Dwi Septian Risqon Septian Ritonga, Matnur Rizki Dwi Putra Rizki Prinanda Umar Rizki, Fildzah Rizki, M. Rosmini Maru S. Indira Adhi Ariana Saiful Bahri Salsabila Atalia Sadil Sejati, Septias Herson Setyanto Setyanto Sherliana Sherliana Sholehuddin, Sholehuddin Sindu Abadi Sampurna Siti Yulianah M. Yusuf SRIYANTI RAHMATUNNISA Sulaiman Zhiddiq, Sulaiman Sumiharni Sumiharni Sundi, Venni Herli Suryaningsih Suryaningsih Susilo, G.E. Syah, Aminudin SYAMSU ALAM Taufik Ramadhani Taufiq Qurrahman Umar Umar Wahyudhi, Aden Wijayanti, Nurulita WINATA, WIDIA yulisna anggi Yupi Ardianto Yusak Maryunianta