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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Dimensi Pratama Teknik Sipil Jurnal Infra Rekayasa Sipil Civil Engineering Dimension Dimensi Utama Teknik Sipil Jurnal Pengabdian Masyarakat Bangsa
Daniel Tjandra
Dosen Program Studi Teknik Sipil Universitas Kristen Petra
Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Energy Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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PENGARUH ELEKTROKINETIK TERHADAP DAYA DUKUNG PONDASI TIANG DI LEMPUNG MARINA Daniel Tjandra; Paravita Sri Wulandari
Civil Engineering Dimension Vol. 8 No. 1 (2006): MARCH 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1007.585 KB) | DOI: 10.9744/ced.8.1.pp. 15-19

Abstract

Electrokinetics is one of soft ground improvement methods to improve its bearing capacity. The objective of this research is to investigate the increase of friction and end bearing resistance of an embedded instrumented model pile in marine clay after electrokinetics treatment. The initial geotechnical properties of soil surrounding the pile foundation is obtained by several soil laboratory tests. For pile bearing capacity analysis, friction and end bearing resistance of pile was measured by load cell measuring device, while un-drained shear strength analysis was measured by vane shear test. The result of this research showed that after 24 hours electrokinetics treatment, the un-drained shear strength increased closer to the pile, and the bearing capacity of pile increased 14 times. Abstract in Bahasa Indonesia : Elektrokinetik adalah salah satu metode perbaikan tanah lunak yang diaplikasikan untuk meningkatkan daya dukung tanah lunak. Tujuan dari penelitian ini adalah untuk menyelidiki peningkatan tahanan friksi dan ujung suatu model pondasi tiang di lempung marina setelah dilakukan proses elektrokinetik. Karakteristik tanah pada kondisi mula-mula di sekitar pondasi tiang didapatkan dari beberapa pengujian di laboratorium. Untuk analisa daya dukung tiang, tahanan friksi dan ujung dari pondasi tiang diukur dengan alat pengukur load cell, sedangkan analisa kuat geser undrained diukur dengan pengujian baling-baling. Hasil penelitian menunjukkan bahwa setelah pada tanah dilakukan proses elektrokinetik selama 24 jam, daya dukung dari pondasi tiang meningkat 14 kali dan semakin dekat dengan tiang, kuat geser undrained juga semakin meningkat.
IMPROVING MARINE CLAYS WITH ELECTROKINETICS METHOD Daniel Tjandra; Paravita Sri Wulandari
Civil Engineering Dimension Vol. 9 No. 2 (2007): SEPTEMBER 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1079.173 KB) | DOI: 10.9744/ced.9.2.pp. 98-102

Abstract

The high water content in marine clays could loosen the bond of soil particles, resulting in low bearing capacity and high compressibility of the soil. Excessive settlements could happened to the structures built on it. An electrokinetic process was attempted to reduce the high water content of the marine clay. An experimental study was conducted to evaluate the effect of electrokinetic on marine clay improvement. This study focused on the use of electrokinetic to enhance the soil bearing capacity of marine clay by improving index properties of the marine clay. The result of this research was obtained by doing several analyses on water content, pH value, and soil particles of soil sample located between cathode and anode. Based on the results from laboratory testing, it can be concluded that electrokinetic process decreased the water content and pH value of soil surrounding the anode. Also, soil particles surrounding the anode became in close proximity. This indicated that as it became closer to the anode, soil became denser.
ANALISA STABILISASI TANAH LUNAK DENGAN CAMPURAN PORTLAND CEMENT DAN FLY ASH UNTUK DIAPLIKASIKAN PADA BANGUNAN RUMAH TINGGAL 2 LANTAI Yohanes Febrian Onggara; Daniel Tjandra; Johanes Indrojono Suwono
Jurnal Dimensi Pratama Teknik Sipil Vol 11, No 2 (2022): September 2022
Publisher : Jurnal Dimensi Pratama Teknik Sipil

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

Abstract

Tanah lunak merupakan jenis tanah kohesif yang terdiri dari butiran-butiran kecil seperti lempung dan lanau. Tanah lunak memiliki sifat gaya geser rendah, pemeabilitas rendah, pemampatan tinggi, dan daya dukung tanah rendah sehingga memerlukan stabilisasi tanah. Stabilisasi dilakukan dengan menggunakan material semen dan fly ash. Pengujian dilakukan menggunakan tanah lunak yang diambil dari PT. Endo Surabaya dengan nilai kuat tekan bebas tanah asli 0.48 kg/cm2. Pengujian yang dilakukan meliputi karakteristik tanah asli, UCT dan CBR unsoaked. Benda uji yang dibuat berjumlah 3 untuk pengujian masing-masing karakteristik tanah asli dan masing-masing 2 benda uji dibuat untuk tiap variasi campuran pengujian UCT dan CBR unsoaked. Penelitian ini bertujuan untuk mengetahui campuran optimum semen dan fly ash dan dampak pemeraman (2 hari dan 4 hari) pada daya dukung dan sifat fisik tanah lunak agar bisa diaplikasikan kepada pembangunan rumah tinggal 2 lantai. Dari hasil penelitian UCT dan CBR terjadi kenaikkan kekuatan tekan bebas tanah undisturbed sebesar 273% dan tanah asli sebesar 190% jika dibandingkan dengan daya dukung tanah yang sudah distabilisasi. Pada aplikasi perhitungan daya dukung pondasi lajur rumah tinggal 2 lantai didapati daya dukung minimum tanah stabilisasi mampu menopang rumah tinggal 2 lantai dengan berat 22 ton menggunakan dimensi pondasi lajur sebesar 400 x 80 cm
DAMPAK NEGATIF PROYEK PEMBANGUNAN RUMAH TINGGAL TERHADAP BANGUNAN DI SEKITARNYA – STUDI KASUS DI SURABAYA Daniel Tjandra; Paravita Sri Wulandari
Rekayasa Sipil Vol. 17 No. 1 (2023): Rekayasa Sipil Vol. 17 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2023.017.01.5

Abstract

The need for housing in a metropolitan city such as Surabaya will increase with time.  These needs can be met by building new houses or renovating. Sometimes the construction and renovation of houses will more or less have an environmental impact on the surrounding buildings.  The case study in this paper aims to increase public awareness of the impact of construction project on the surrounding buildings. The case study was conducted by doing field observations on the location of a residential house construction which had an impact on the adjacent houses, located on the right and left side. It was obtained that the damage to the adjacent houses was caused by the demolition of the old building, the addition of loads, and the process of compaction of the backfill.  Repair and strengthening of buildings must be carried out to restore the function of the building and prevent further damage. Unfortunately, repairing the building requires significant additional costs and causes the construction time to be longer.
Implementasi Alat Peraga Tabel Perkalian Bagi Siswa Sekolah Dasar untuk Meningkatkan Antusiasme Siswa Sari, Rospala Hanisah Yukti; Achmadi, Achmadi; Tjandra, Daniel; Safrudin I, Muhammad Yudha
Jurnal Pengabdian Masyarakat Bangsa Vol. 2 No. 12 (2025): Februari
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v2i12.2029

Abstract

Matematika sering kali dianggap sebagai mata pelajaran yang sulit oleh sebagian siswa. Halini disebabkan sifat matematika yang abstrak. Oleh karena itu, siswa di usia dini masih dalam tahap perkembangan pada kemampuan kognitifnya. Oleh karena itu, penggunaan alat peraga dalam pembelajaran dapat membantu peserta didik dalam memahami konsep matematika yang abstrak, terlebih jika dikemas dengan menarik. Salah satu alat peraga yang diimplementasikan dalam materi perkalian yaitu Tabel Perkalian. Tabel Perkalian merupakan alat peraga yang bisa membantu peserta didik memahami dan menghafal operasi perkalian. Tujuan dari kegiatan ini adalah antusiasme siswa pada pembelajaran matematika materi perkalian mengalami peningkatan dengan bantuan alat peraga. Hasil dari kegiatan ini adalah antusisme siswa pada pembelajaran matematika ketika menerapkan alat peraga mengalami peningkatan.
Study on Graphite Powder as Conductive Pigments for Impressed Current Cathodic Protection System using Carbon Fiber Reinforced Polymer Anode Gunawan Budi Wijaya; David Pratama Lays; Hongky Haodiwidjaya Tanto; Daniel Tjandra
Civil Engineering Dimension Vol. 21 No. 2 (2019): SEPTEMBER 2019
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.223 KB) | DOI: 10.9744/ced.21.2.84-88

Abstract

The use of Carbon Fiber Reinforced Polymer (CFRP), for both strengthening material and anode for Impressed Current Cathodic Protection (ICCP) system, is being investigated.  The focus of this study is to develop the epoxy that has good bond strength and electrical conductivity. Graphite powder is used as conductive pigments with percentage ranges from 7.5% to 17.5%.  All specimens were partially submerged in 5% NaCl solution and induced with electrical current of 10 mA/m2 and 20 mA/m2 for 30 days. An average potential increase of 200 mV was recorded using half cell potential test. The application of 30 days ICCP up to current density of 20 mA/m2 did not affect the bond strength significantly and still complies with ACI recommendation. However, graphite content of more than 15% are found to be not workable and the bond strength is greatly reduced to less than 1 MPa This study concluded that the recommended graphite powder content shall be in the range of 10% to 15%.
ANALISIS KESTABILAN MODEL LERENG TANAH PASIR KELEMPUNGAN TERHADAP GETARAN DI LABORATORIUM Haryanto, Andre Yongsin; Tjandra, Daniel; Wulandari, Paravita Sri
Dimensi Utama Teknik Sipil Vol. 13 No. 1 (2026): April 2026
Publisher : Program Studi Magister Teknik Sipil - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/duts.13.1.65-71

Abstract

Steep slope conditions combined with the influence of vibrations can lead to landslides. Therefore, slope stability is crucial in highland areas. This study aims to analyze the effect of vibrations on the stability of sandy clay slopes with varying sand and clay compositions of 70%:30%, 60%:40%, and 50%:50%, as well as slope angles of 45° and 60°. The research began with soil characterization tests and a Proctor test. Subsequently, vibration simulations were conducted using a vibrator machine. The results showed that variations in clay content and slope angle influence the landslide patterns that occur when the slope is subjected to vibrations. The higher the sand content, the greater the potential for landslides due to decreased soil stability under vibration. Additionally, the steeper the slope, the higher the risk of landslides.
Co-Authors Achmadi Achmadi Agnes - Elena Agustinus Noertjahyana Alexander William Arnold Yapeter Arnold Yapeter, Arnold Billy Christian Johan Calvin - Limantoro Celine Michaella Sutjiadi Christien Halim Christopher Henry Sugiarto Christopher Henry Sugiarto Daniel - Lewa Darwin Hughie David Christian David Pratama Lays David Pratama Lays David Tanujaya David Tanujaya, David Elizabeth Yolanda Fiona Swasti Adi Fiona Swasti Adi Gogot Setyo Budi Gogot Setyo Budi Grace Christiani Linggadiharja Gunawan Budi Wijaya Gunawan Budi Wijaya Gunawan Budi Wijaya Handoko - Sugiharto Handoko Sugiharto Harvey Ramses Panjaitan Haryanto, Andre Yongsin Hendry Indra Pramana Hendry Indra Pramana Hongky Haodiwidjaya Tanto Hongky Haodiwidjaya Tanto Jessica Agustine Widjaja Joedy Harto P Johanes - Suwono Johanes I. Suwono Johanes I. Suwono, Johanes I. Johanes Indrojono Suwono Johanes Indrojono Suwono Johanes Suwono Johanes Suwono Jondry Lawono Joseph Richard Joshua - Alexander Kennedy Kennedy Kevin Elmerson Hidayat Kevin Hartanto Wijaya Kevin Jonathan Santoso Kevin Kevin Lydia Loahardjo Lydia Loahardjo Michael Henry G Nathaniel Evan Wijaya Oentardjo, Yohanes Paravita Sri Wulandari Paravita Sri Wulandari Pretty Angelina Tay Pretty Angelina Tay Resmana Lim Reynaldi - Sedjie Ricky Ivan Wiyanto Roberto Siswanto Goni Roberto Siswanto Goni Rospala Hanisah Yukti Sari Safrudin I, Muhammad Yudha Sally Sally Samuel Eric Sentosa - Purnomo Stefanus Brian Juan Nday Tika - Harsono Vedi Wihono Susilo William Putera Suryanto William, Alexander Yohanes Febrian Onggara Yohanes Oentardjo