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All Journal Economic Journal of Emerging Markets Agroland : Jurnal Ilmu-Ilmu Pertanian Jurnal Sains dan Teknologi AGROTEKBIS Jurnal Online Mahasiswa (JOM) Bidang Pertanian Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Fisika Unand JGE (Jurnal Geofisika Eksplorasi) Riau Journal of Computer Science Jurnal Mirai Management Jurnal Ilmiah Universitas Batanghari Jambi Jurnal CoreIT Jurnal Laut Khatulistiwa INTECOMS: Journal of Information Technology and Computer Science Jurnal Rekayasa Sipil Jurnal Teknologi Sistem Informasi dan Aplikasi Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia International Journal of Supply Chain Management Jurnal Informasi dan Komputer Unes Law Review SOSIO EDUKASI Jurnal Studi Masyarakat dan Pendidikan JASa (Jurnal Akuntansi, Audit dan Sistem Informasi Akuntansi) Jurnal Pendidikan Surya Edukasi (JPSE) JURNAL PENDIDIKAN MIPA Andalas obstetrics and gynecology journal Jurnal Daur Lingkungan Journal of Robotics and Control (JRC) Maspul Journal of Community Empowerment JUKI : Jurnal Komputer dan Informatika Jurnal Integrasi Kesehatan dan Sains Jurnal Ilmu Komputer Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Al-Minhaj DIMAR: Jurnal Pendidikan Islam Jurnal Nasional Manajemen Pemasaran dan SDM JUSTIN (Jurnal Sistem dan Teknologi Informasi) Journal of Comprehensive Science Digital Transformation Technology (Digitech) SAINSTEK Jurnal Penelitian dan Karya Ilmiah Lembaga Penelitian Universitas Trisakti Jurnal Indonesia Sosial Sains Al-Irsyad: Journal of Education Science Al-Irsyad Journal of Physics Education Jurnal Media Ilmu Journal of Social Science and Business Studies JOURNAL OF Mental Health Concerns AGROTEKBIS: Jurnal Ilmu Pertanian Agroland: Jurnal Ilmu-ilmu Pertanian International Journal of Economics, Commerce, and Management Media Penelitian dan Pengembangan Kesehatan Amwaluna: Jurnal Ekonomi dan Keuangan Syariah Jurnal Geosaintek
Muhardi Muhardi
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Preferensi Mahasiswa dalam Meningkatkan Human Capital Melalui Program Pascasarjana Muhardi Muhardi; Sundaya Sundaya
Economic Journal of Emerging Markets Volume 11 Issue 3, 2006
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ejem.v11i3.525

Abstract

This paper described any factors that influential probability college student’s to studying in pascasarjana program’s. Further, there are behaviour’s analysis specifically both college student’s who are to become a member of campus organization and college student’s who are not to become a member of campus organization. To achieve its, we use linear probability model (probit). Estimation result’s are first, its probability significantly determined by age, number they younger brother and sister, and then by estimate of gross benefit from earning after they work with master title’s. Second, probability college student’s who are to become a member of campus organization to studying in pascasarjana program’s exceed probability college student’s who are not to become a member of campus organization.Keyword: graduate program, human capital, probit model
Perbaikan Tanah Gambut Dengan Metoda Kolom Konfigurasi Segitiga Dari Campuran Fly Ash Dan Bottom Ash Imam Hanafi; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Stone column is a digging and replacement effort undertaken to replace soils to be used as base of construction with compacted vertical columns. In this research, column with fly ash and bottom ash mixtures with 40% fly ash and 60% bottom ash is used.The columns are used as reinforcement of peat soil with triangular pattern. Variations used are 3 cm, 4 cm, and 5,5 cm in diameter (D) with spaces 1,25D, 1,5D, and 1,75D. Loading test was performed to the stabilized peat soil and bearing capacity of the soil was analyzed by 20 mm settlement method and theoretical analysis suggested by Barksdale and Bachus (1983).Results of the 20 mm settlement method obtained maximum bearing capacity is given by 5,5 cm diameter and 1,25 D space variation. The maximum bearing capacity is 9,20 kg/cm2 with an increase of 51,07%. For theoretical analysis of single column, maximum bearing capacity is given by 3 cm diameter and for theoretical analysis of group columns, maximum bearing capacity is given by 5,5 cm diameter and 1,75 D space variation.Keywords : stone column, diameter, space, bearing capacity
Karakteristik Mekanis Dari Campuran Abu Terbang Dan Abu Dasar Dalam Geoteknik Ridwan Hamdani; Muhardi Muhardi; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Generally, coal are used for fuel by industry factory at Indonesia. Coal burning produce two of kind waste, that is fly ash and bottom ash. Utilization of coal waste is not optimal yet at this time. This research aims to find out optimum percentage from fly ash and bottom ash mixed by mechanical strength and to know curing effect for 0 and 28 days. The result of proctor standard is increasing proportion bottom ash content on fly ash and bottom ash mixed, then increased dry density maximum while optimum moisture content is decreased. CBR value is increased with increasing bottom ash content. From UCS test, value shear strength (cu) is decreased because increasing bottom ash content. Value from CBR, UCS and Triaxial test is increased after curing for 28 days.Keywords: coal, fly ash, bottom ash, mixed, mechanic characteristic
Stabilisasi Tanah Lempung Menggunakan Palm Oil Fuel Ash (POFA) Charles AN; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Clays are soft soil which have a low bearing capacity and potentially to failure. Utilization of additive material is an one way that can be applied to stabilize the clay. This study was conducted to determine the effectiveness of using POFA which is a local available material as an one alternative in stabilizing the clay by increasing its bearing capacity. The research focused on the influence of the POFA percentage with CBR value and the value of Cu in the clay stabilization. The results showed that the increasing of POFA percentage and curing process resulted in the increasing CBR and Cu values.  The average increase in the value of CBR curing method 1 to CBR without curing by 0,07% at the top and the bottom of the CBR. whereas for the curing method 2 by 2,29% at the top of CBR and 2,41% at the bottom of CBR. For cu values, the average increase by 1,10 kPa for curing method 1, and 14.65 kPa for curing method 2. It shows an increase in the value of the bearing capacity of the clay.  Key Words: CBR value, cu value, clay, POFA.
Analisis Kekuatan Daya Dukung Pondasi Helical Menggunakan Data Sondir Pada Tanah Gambut Galang Maulana; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Bearing capacity of Helical Pile on peat soil can be obtained from cone penetration test (CPT). Bearing capacity based on CPT data is calculated by Bustamante & Gianeselli (LCPC) method, Schmertmann method, method Meyerhoff, Price & Wardle method, and Tumay & Fakhroo method. Meanwhile, there are two methods based on peat soil mechanisms to determine the bearing capacity of the helical pile such a cylindrical shear method and individual bearing method. This research evaluates bearing capacity of the five methods above by implementing two basic methods helical pile on peat soil that most closely to the actual bearing capacity. The results showed that the method Bustamante & Gianeselli (LCPC) to provide bearing capacity that most closely to the actual bearing capacity compared to other methods. Reduction factor is also necessary to modify bearing capacity the foundation Helical. After reduced, bearing capacity of each method has decreased significantly and tends to approach the actual bearing capacity.Keywords: Cone Penetration Test, Helical Foundation, Peat, Capability, Reduction Factor.
Analisis Daya Dukung Pada Tanah Gambut Dan Lanau Menggunakan Cerucuk Kayu Mahang Fajrian Saddek; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Soft soil is one of the soil type with low bearing capacity. Generally the problem that arises in the construction on soft soil is sliding. An attempt to improve low shear resistivity of soft soil can be accomplished through soil reinforcement methods. One of the method is by using wooden pile as foundation. Wooden pile can be resembled as a shortpile, one of a foundation type that widely used in soft soil layer especially to bear a large amount load.This research was conducted through laboratory scale model approach method, but the behavior was made to resemble actual behavior in the field. Wooden pile type that will be used in this research is Mahang Wood and will be installed on peat soil and silt soil. Variations of installed wooden pile are 1 pile, 4 pile, and 9 pile with each pile divided into pile with bark and pile without bark. It is also varied with installation of piles for 1 day and 7 day. It is hoped that such small-scale behavior will result in additional theories of reinforcement in soft soil.The result of this research is the increasing of soil bearing capacity along with the addition of pile number. The bark of the wood pile also affects the bearing capacity. Increased bearing capacity occurs from 1 day to 7 day installation.Keywords : bearing capacity, wooden pile, soft soil, peat, silt
Karakteristik Fisis Dan Mekanis Abu Sawit (Palm Oil Fuel Ash) Dalam geoteknik Rizqi Yuliana; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

POFA is an agrowaste ash which is produced from fibers, nut shells, and empty fruit bunches when burnt at temperatures of about 800-10000C in boiler. The production of POFA is rising every year, it is disposed for landfills, now become an important environmental disposal issue. A large area is required for the disposal of these POFA waste materials. The landfill of POFA is the problem for the palm oil industry when it is not reused for any work. POFA contains a large amount of silicon dioxide with high pozzolanic reactivity and has high potential to be used in any engineering work. This research examined POFA characteristics in geotechnical application and its influence by curing periods on 0, 7 and 28 days. In this paper, physical and mechanical characteristics of POFA in geotechnical work will be shown. The chemical composition of POFA prove the existence of SiO2, Al2O3, Fe2O3 and CaO as important substances supporting pozzolan reaction during cured. The result shows that the characteristic of POFA has similar behaviour with sands. Coefficient of permeability decreased during curing periods. Besides, cohesion shear strength, angle of friction, cohesion undrained, and CBR value are improve during curing periods.    Keywords:  POFA, geotechnic, pozzolan reaction
Pengaruh Variasi Diameter Dan Jarak Kolom Campuran Abu Terbang Dan Abu Dasar Dengan Pola Segi Empat Terhadap Daya Dukung Tanah Gambut Aisyah Putri; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Group of columns that inserted in the soft soil will increase shear strength and density of the soil, reduce soil settlement and liquefaction potential, and increase bearing capacity ofthe soil. Things that must be considered in columns design are diameter, length, space, and pattern of the columns group. This study aims to see the effect of diameter and columnspacing on bearing capacity of peat. Variation of diameter that used in this study are 3 cm, 4 cm, and 5,5 cm. Variation of space that used in this study are 1,25D, 1,5D, and 1,75D.The results of laboratory testing indicate that increasing the diameter dan decreasing the space between columns will increase bearing capacity of stabilized peat. Maximumbearing capacity given by 5,5 cm diameter and 1,25D space variation. The increasing of bearing capacity reaches 74,49%. The results of theoretical analysis give different tendency.Increasing of diameter dan space between columns will increase bearing capacity of the stabilized peat. This tendency difference is due to the influence of overlap between soils withinthe unit cell due to the very close space of the column.Keywords : stone column, diameter, space, bearing capacity
Karakteristik Pull - Out Resistance Tulangan Sebagai Perkuatan Pada Tanah Lempung Said Defri Ariandi; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Ground improvement by using reinforcement developed rapidly in recent decades. Since it was first introduced by Vidal (1966), this method is suitable to reduced the deformation of both lateral and vertical deformation. Clay materials used because of its availabilityand lower cost, clay have shown good performance as embankment, and for the reinforcement material using 10 mm steel bar. This laboratory-scale test prepared at two dry side water content, two wet side water content and optimum water content (OMC), while the pullout resistance from longitudinal reinforcement. Pullout resistance reinforcement would be highest when the water content of clay are in optimum condition, adhesi is the dominant force in this pullout resistance test. Keywords: Pullout resistance, water content, reinforcement
Analisis Pengaruh Jarak Pelat Helical Terhadap Daya Dukung Tekan Helical Pile Pada Tanah Gambut Ralan Ditra; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Helical piles are a type of foundation that come with helical plate in certain number and space. The research will present the results of loading test using constant rate penetration method conducted on peat soil. Data obtained from the test are load and settlement which then interpreted using both terzaghi and method and tangent intersection method. The result shows no proportional correlation between the load capacity of helical pile withsimilar diameter and the increase of helical plate distance. The bearing capacity of helical pile is influenced by the ratio between the space and the diameter of the plate. The aforementioned load tests are compared with the result of bearing capacity calculationusing individual bearing and cylindrical shear method. It is obtained from the result that the bearing capacity of helical foundation is closer to the behaviour of bearing capacityobtained from cylindrical shear method with 0.633 standard of error while the bearing capacity of individual bearing method is close to the result of standard load test with .637 standard of error.Keyword : helical foundation, peat soil, individual bearing, cylindrical shear.
Co-Authors Abdul Hadid Abdul Razzaq Abdul Wahid Abdul Walid Abubakar M. Lajhie Adrianton Adrianton Adwiyah, Rabiatul Afdalia, Afdalia Ahmad Satria Efendi, Ahmad Satria Aisyah Putri Aisyah, Siti Nadira Aldi, Aldi Alex Kurniawandy Amiruddin Sahabu Andi Kamal Ahmad Anggriana, Anna Anita Febriani Annesia Malantiyaz Aris Aryanto Arnis En Yulia Arvi Iskandar Asmira, Adhe Azrul Azwar Benni Harianto Naibaho Budi Hartono Charles AN Chitra Anggriani Salingkat Christoporus, Christoporus Cucut Susanto, Cucut D Gandana Madjakusumah Dadang Kusnadi Dance Tangkesalu Darsin Darsin Dede R Oktini Dedy Yasriady Devi Melisa Veronica Dewa Ariembawa Diandra, Roni Djuni Farhan Dodi Pratama Dodi Pratama Effendy Effendy Efrian Saputra Ellia Marlina Fachry Abda El Rahman Fadlan Fadlan Faisal Faisal Fajrian Saddek Ferry Fatnanta Fonda, Hendry Galang Maulana Geulis, Yusanneya Gunawan Wibisono Hadiyan Putra, Hadiyan Hamdana Hamdana Hamida, Hayatul Handri Handri Hapsari, Nurma Murti Hardy Hutahaean Harnedi Maizir Harnipa, Harnipa Hayatul Hamida Holid Holid Ida Ayu Putu Sri Widnyani Idamayanti, Reski Imam Hanafi Indah Fitriana Juliasman, Rendy Dwi Jumrah Jumrah Jumrah Jumrah Kartika Sari, Desi Kasmuliani, Kasmuliani Kiswanto Kiswanto Krisna, Daniel Surya Lita Darmayanti Made Antara Madyana Patasik Mahfudz Mahfudz Maman Sutisna Marhani Marhani Mellinda, Devi Melyanti, Rika Muh Fardhal Pratama Muh. Syahlan Natsir Muhamad Yusa Muhammad Basir Cyio Muhammad Hafizh Anwar Muhammad Naufal Rivan Muhammad Rofiq Muhammad Syafnil Ramadhan MUHAMMAD SYAIFULLOH Muhammad Tahir MUHAMMAD TAUFIK Muhardi Muliadi Mustamin B, Mustamin B Nandang Ihwanudin Nirmala, Sri Nunung Nurhayati Nurchi Syahri Nurdin Nurdin nurfadiiah, nurfadilah Nurlina Nurlina Ordila, Rian Perdhana, Radhitya Perkasa, Subhan Prasetya, Irvan Nur Prawiradilaga, R. Rizky S Prayitno, Dwi Imam Puspa Ningrum Putri, Nofia Afifah Rahma Silva Anita Rahmalisa, Uci Ralan Ditra Ramadani, Sri Refni Wahyuni Reynaldi Saputra Rezeki, Desi Saputri Sri Ridwan Hamdani Ridwan, Alfadhella Rio Hidayat Risfandipraja, Rafdy Rizky Suganda Prawiradilaga Rizqi Yuliana Robi Handi Putra Roni Indra Lesmana Rosianti Mokoginta Rostiati Dg Rahmatu Rustam Abd. Rauf Rustan, Sriwahyuni s, Pirmadona Sabna, Eka Sadida, Zayyana Jasmine Said Defri Ariandi Sakinah, R Kince Salsabila Hasanah Sangadji, Muhammad Nur Sanjaya, Gigih Santi Santi Saputra, Adetia Sentana, Jeri Trio Sihombing, Halasan Sitti Rahmayani Soewignjo Agus Nugroho Sri Anjar Lasmini Sri Suwarsi Sulaiman Sulaiman Sundaya Sundaya Suryadi Ramadhan Syafrinal, Syafrinal Syam, Moh Amin Syamsul Arifin Tabah Miftahudin Tomi, Tomi Toni, Afriwan Umi Muawanah Wahyudi, Alfin Wardah Wardah Warsidah, Warsidah Wijaya, Agus Sunar Winda Sari Wiwik Handayani Wulansari, Dita Novia Yani Oktavia Yoga Satria Putra Yohanis Tambing Yuda Irawan Yudha Arman Yugo, Tri Yulanda, Yulanda Yuli Widiyono Yulia Beikircher Yusrawati Yusrawati Z, Harist Febrie R Zalna, Zalna Zulivandama, Shaska Ramadhan Zulkifli, Reynaldi