Garuda - Garba Rujukan Digital

Strength of Cement Treated Clay and Degradation Under Magnesium Sulphate Attack Siregar, Vicky Marita; Handoko, Luky; Gunawan, Sumiyati
Jurnal Teknik Sipil Vol 15, No 2 (2019)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Lumpur Sidoarjo (Lusi) is an environmental issue in Indonesia that produce wasted soils, specifically clay soils, distributed to Porong River which causes a greater problem. Cement treated clay (CTC) becomes one of the solutions to overcome the problems caused by Lusi due to its ability in improving the strength of clay soils. This paper investigates CTC with lower cement amount (C <70 kg/m3) for reclamation and higher cement amount (C >150 kg/m3) for deep mixing marine clay for its strength and degradation due to the attack of magnesium sulphate as the main component of seawater which cause the degradation of CTC. The enhancement of soil strength is investigated by unconfined compression test (qu) and the degradation by penetration test. Water content of the specimens for both tests are arranged in its liquid limit condition (60%) and two times of its LL (120%). The result of the cement amount addition for both water content shows the enhancement of qu represented by linear and the tip resistance is increased. The characterictic of degradation for lower cement amount with close range present similar depth of deterioration, like-wise higher cement content. The value of tip resistance is not relatable with qu.

Strength of Cement Treated Clay and Degradation Under Magnesium Sulphate Attack Vicky Marita Siregar; Luky Handoko; Sumiyati Gunawan
Jurnal Teknik Sipil Vol. 15 No. 2 (2019)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Lumpur Sidoarjo (Lusi) is an environmental issue in Indonesia that produce wasted soils, specifically clay soils, distributed to Porong River which causes a greater problem. Cement treated clay (CTC) becomes one of the solutions to overcome the problems caused by Lusi due to its ability in improving the strength of clay soils. This paper investigates CTC with lower cement amount (C <70 kg/m3) for reclamation and higher cement amount (C >150 kg/m3) for deep mixing marine clay for its strength and degradation due to the attack of magnesium sulphate as the main component of seawater which cause the degradation of CTC. The enhancement of soil strength is investigated by unconfined compression test (qu) and the degradation by penetration test. Water content of the specimens for both tests are arranged in its liquid limit condition (60%) and two times of its LL (120%). The result of the cement amount addition for both water content shows the enhancement of qu represented by linear and the tip resistance is increased. The characterictic of degradation for lower cement amount with close range present similar depth of deterioration, like-wise higher cement content. The value of tip resistance is not relatable with qu.

Analisa Pondasi dan Potensi Likuifaksi Pembangunan Laboratorium dan Gedung Fakultas Universitas Atma Jaya Yogyakarta Gunawan, Sumiyati; Wijaya, William; Maylda Pratama, Gumbert; Handoko, Luky; Hadsari, Vienti
Jurnal Atma Inovasia Vol. 3 No. 4 (2023)
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jai.v3i4.7341

Laboratorium Teknik Sipil dan Fakultas Teknobiologi Universitas Atma Jaya Yogyakarta, berkembang sangat pesat seiring dengan perkembangan ilmu pengetahuan dan penelitian. Alat laboratorium, mahasiswa dan peneliti yang cukup besar melakukan aktifitas praktikum dan penelitian, sehingga ruang laboratorium, ruang kelas gedung lama tidak memadai lagi dan akan dibangun gedung baru yang lebih memadai untuk proses belajar mengajar, penelitian dan pengabdian masyarakat yang layak dan nyaman. Pembangunan membutuhkan informasi lapisan tanah pendukung untuk kestabilan dan kekokohan bangunan, memperkirakan profil tanah, daya dukung tanah, parameter tanah, dan potensi likuifaksi untuk rekomendasi pondasi bangunan. Informasi lapisan tanah pendukung diperoleh dari serangkaian uji tanah di lapangan dengan pengeboran sampai kedalaman 30m dan sondir dengan kekuatan 10 ton, untuk memperoleh profil dan sample tanah. Uji di laboratorium dilakukan untuk mendapatkan parameter tanah. Analisa daya dukung dan analisa potensi likuifaksi akan di rekomendasikan untuk perancangan. Hasil analisa memperoleh daya dukung bored pile diameter 60cm dan 80cm pada kedalaman -7,0m sebesar 40ton dan 60ton, potensi likuifaksi dengan pertimbangan gempa terkuat yang pernah terjadi, pada kedalaman sekitar -17,50m sampai -20,0m dengan Liquefaction Severity Number 7,36 dan penurunan maksimal sebesar 11,87 cm, yang berarti terjadi kerusakan minor.

PENGARUH WAKTU CURING TERHADAP STABILITASI TANAH DASAR LEMPUNG MENGGUNAKAN POLIMER Adriza, Annisa Putri; Handoko, Luky; Hatmoko, John Tri
Jurnal Deformasi Vol. 4 No. 2 (2019): JURNAL DEFORMASI
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/deformasi.v4i2.3556

ABSTRAKTanah lempung lunak tersebar di beberapa wilayah di Indonesia. Umumnya, tanah lempung lunak sifat mekanik yang buruk sehingga tidak cocok digunakan sebagai tanah dasar. Stabilisasi terhadap lapisan tanah dasar untuk pembangunan jalan merupakan salah satu solusi untuk mengatasi masalah yang terjadi pada tanah lunak. Polimer adalah bahan tambah masih dikembangkan untuk stabilisasi tanah dasar di Indonesia. Polimer memiliki potensi menggantikan semen dan kapur sebagai bahan tambah tradisional. Pada penelitian ini akan dibahas mengenai pengaruh waktu curing terhadap sifat fisik tanah dan sifat mekanik tanah dasar yang distabilisasi oleh polimer bila dibandingkan dengan tanah asli. Benda uji diperam selama 2, 4, 6, 9, 18, 24, 48,72 jam dan 7 hari. Hasil penelitian menunjukkan adanya perbaikan dengan menurunnya nilai indeks plastisitas dan kadar air. Nilai kuat tekan bebas mengalami kenaikan sebesar 10% setelah di lakukan pemeraman selama 7 hari.Kata Kunci : Tanah dasar, waktu curing, polimer, indeks plastisitas, kuat tekan bebas

Pengaruh Perubahan Kadar Air pada Sifat-Sifat Tanah Organik yang distabilisasi dengan Limbah Karbit dan Abu Ampas Tebu HATMOKO, John Tri; HANDOKO, Luky
Jurnal Rekayasa Konstruksi Mekanika Sipil Vol 2 No 2 (2019): Volume 2 Nomor 2 Tahun 2019
Publisher : Fakultas Teknik Universitas Katolik Santo Thomas

Research on organic soil stabilization utilizing materials such as cement, lime, rice husk ash, fly ash, bagasse ash to change soil shear behavior has been widely carried out to this date. However, not many researchers have studied the changes in water content in organic soils that have been stabilized with such materials, especially on the changes in soil physical properties. This study aims to find out the effect of changes in water content in physical properties including: volume weight (Î³), specific gravity (G), water content (w), void ratio (e), degree of acidity (pH) and content organic (O). A series of tests was conducted, namely the chemical composition of: organic soil test (TO), carbide waste (CCR), and bagasse ash (AAT), and testing for the physical properties of organic soil. Further, additional material (60% CCR and 40% AAT) was added to the soil in proportions: 5, 10, 15, 20, 25 and 30% combined with different initial water contents (498, 548 and 598%) and curing time: 7, 14, 21 and 36 days. Then, we conducted test for physical properties of the soil that has been stabilized. The physical and chemical properties of the soil change subject to added material content and ripening time. At high water content, the change is more significant than at lower water content. The volume weight, specific gravity, and acidity of the soil increases while the void ratio and soil organic content decrease. The optimal content of added material is 20% with an optimal time of curing 21 days

PELATIHAN DASAR SPMI DAN AMI UNTUK MENINGKATKAN PEMAHAMAN PENGGERAK SPMI PERGURUAN TINGGI Suharyanti, Yosephine; Purwanugraha, Heribertus Andre; Handoko, Luky; Emanuel, Andi Wahju Rahardjo; Bharata, Bonaventura Satya; Vitasurya, Vincentia Reni; Rudwiarti, Lucia Asdra; Budiharta, Pratiwi; Pramudyanto, Alexander Beny; Wiranata, F. Edwin
Transformasi dan Inovasi : Jurnal Pengabdian Masyarakat Vol 5 No 2 (2025): Volume 5, Nomor 2, Juli 2025
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpm.v5n2.p90-98

Internal quality assurance (IQA) in higher education institutions (HEIs) is believed to be the spearhead for accelerating the improvement of the quality of HEIs and the study programs within it. However, currently many HEIs are trapped in the formal implementation of IQA and does not reach its essence, so it does not have a real impact on the quality of the HEIs. Universitas Atma Jaya Yogyakarta is one of the partners of the Directorate of Learning and Student Affairs of the Directorate General of Higher Education, Research, and Technology to devote itself by providing training and sharing good practices in implementing IQA to six HEIs with 31 study programs in 2024. This training aims to provide experience and insights for participants to become drivers of accelerating the implementation of IQA in their respective HEIs and study programs. The training was carried out in two stages in September and October 2024, each for two days, with materials covering IQA system development, IQA organization, IQA documents, and internal quality audits. This training went smoothly and effectively, as evidenced by the increase in participants' comprehension as measured by a pre-test and a post-test. After six months had passed, the indirect impact of this training was also seen in the accreditation of two participating HEIs that had unaccredited status during the training.

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search