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Anik Kustirini, Anik
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Semarang
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Journal : Teras Jurnal

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Studi Perilaku Tiang Group Pada Lapisan Tanah Terlikuifaksi Situmorang, Adolf; Kustirini, Anik; Purwanti, Hani
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 1 (2024): Volume 14 Nomor 1, Maret 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i1.983

Abstract

Abstrak Likuifaksi merupakan satu fenomena yang terjadi pada lapisan tanah akibat gempa bumi. Pada saat terjadi likuifaksi tanah mengalami peningkatan tekanan air pori yang menyebabkan tanah kehilangan kuat geser sehingga mengalami penurunan tegangan efektif dan secara linier mengakibatkan penurunan kuat geser. Penelitian ini dibuat untuk mengetahui perubahan perilaku tiang akibat lapisan tanah terlikuifaksi disepanjang tiang. Semua analisa perubahan perilaku tiang dibandingkan dengan kondisi atau kondisi tidak ada lapisan terlikuifaksi, sehingga dapat diketahui perubahan perilaku tiang ketika ada lapisan teriluifaksi. Dari hasil analisa defleksi diketahui bahwa terjadi perubahan defleksi yang besar jika dibandingkan antara lapisan tidak terlikuifaksi dengan lapisan terlikuifaksi, yaitu dari 0,16 mm menjadi 4,32 mm atau meningkat sebesar 4.16 mm. Perubahan momen untuk lapisan tidak terlikuifaksi 23 kN menjadi 219 kN untuk kondisi lapisan terlikuifaksi atau meningkat sebesar 196 kN.m, hal yg sama pada perubahan daya dukung yang mengalami penurunan ketika terjadi likuifaksi, sehingga disimpulkan bahwa ada perubahan perilaku tiang jika terdapat lapisan terlikuifaksi. Kata kunci: likuifaksi, sondir, daya dukung tiang, defleksi   Abstract Liquefaction is a phenomenon that occurs in soil layers due to earthquakes. When liquefaction occurs, the water pressure of soil has increased which causes the soil to lose shear strength, resulting in a decrease in effective stress and linearly resulting in a decrease in shear strength. This research was conducted to determine changes of pile behavior due to liquefaction of the soil layer along the pile. All analyses of changes of pile behavior are compared with conditions where there is no liquefaction layer, so that changes of pile behavior can be seen when there is liquefaction layer of soil. The results of the deflection analysis, it is known that there is a large change in deflection when compared between the non-liquefaction layer and the liquefaction layer, namely from 0.16 mm to be 4.32 mm or increases 4.16 mm. The change in moment for the liquefaction layer is 23 kN to be 219 kN for the liquefaction layer condition or increases 196 kN.m, the same thing as the change in bearing capacity which decreases when liquefaction occurs, so it is concluded that there is a change of pile behavior if there is a liquefaction layer. Keywords: liquefaction, CPT, bearing capacity of pile, deflection
Inovasi Teknologi SCGC (Self Compacting Geopolymer Concrete) Sebagai Material Berkelanjutan Kustirini, Anik; Cahyono, Dhamang Budi; Purnijanto, Bambang; Budiningrum, Diah Setyati
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1334

Abstract

Abstrak   Beton geopolimer merupakan beton tanpa semen sebagai bahan pengikat, dipandang sebagai solusi mengatasi pemanasan global akibat produksi semen portland dan alternatif pengganti beton konvensional. Beton geopolimer segar memiliki kekentalan kaku yang tidak workable, padahal workability sangat dibutuhkan dalam proses pengecoran di lapangan. Untuk mengatasi masalah ini, dikembangkan inovasi Self Compacting Concrete (SCC) yang dapat memadat sendiri tanpa alat pemadat. Beberapa metode untuk mendapatkan sifat self compacting meliputi pengaturan kadar agregat, rasio air, dan penggunaan superplasticizer. Penambahan superplasticizer membuat geopolimer lebih workable dengan setting time lebih lama. Pengujian menggunakan slump flow, v funnel, dan box test. Penelitian ini menganalisis kinerja Self Compacting Geopolymer Concrete (SCGC) menggunakan fly ash PLTU Tanjungjati B sebagai pengganti semen. Hasil pengujian menunjukkan campuran berhasil diformulasikan sebagai SCGC berperforma tinggi dengan keseimbangan sangat baik antara fluiditas, stabilitas, dan kemampuan melewati celah sempit. Beton ini efektif untuk aplikasi pada elemen struktur dengan geometri rumit dan penulangan padat, berpotensi meningkatkan efisiensi konstruksi, mengurangi pemadatan mekanis, dan menjamin kepadatan optimal di seluruh struktur.   Kata kunci: SCGC, Fly ash, Slump Flow, V Funnel, Box test   Abstract   Geopolymer concrete is concrete without cement as a binding material, seen as a solution to global warming caused by Portland cement production and an alternative to conventional concrete. Fresh geopolymer concrete has a stiff consistency that is not workable, even though workability is very much needed in the casting process in the field. To overcome this problem, Self Compacting Concrete (SCC) innovation has been developed, which can compact itself without compaction tools. Several methods to obtain self-compacting properties include adjusting the aggregate content, water ratio, and the use of superplasticizers. The addition of superplasticizers makes geopolymers more workable with a longer setting time. Testing was carried out using slump flow, V-funnel, and box tests. This study analyzes the performance of Self-Compacting Geopolymer Concrete (SCGC) using fly ash from the Tanjungjati B power plant as a cement substitute. The test results show that the mixture was successfully formulated as high-performance SCGC with an excellent balance between fluidity, stability, and the ability to pass through narrow gaps. This concrete is effective for applications in structural elements with complex geometries and dense reinforcement, potentially increasing construction efficiency, reducing mechanical compaction, and ensuring optimal density throughout the structure.   Keywords: SCGC, Slump Flow, V-Funnel, Box Test
Co-Authors Adolf Situmorang afrida ranu l Agus Muldiyanto, Agus Ahmad Hakim Bintang Kuncoro Bagus Acung Billahi Bambang Tutuko Budiningrum, Dyah Setyati Cahyono, Dhamang Budi Chatarina Umbul Wahyuni Dhamang Budi Cahyono Diah Rahmawati Dyah Setyati Budiningrum Edy Susilo Edy Susilo, Edy Galih Widyarini galuh cahyo n.w Kukuh Wisnuaji Widiatmoko Kusrin l, afrida ranu Mahasukma, Devinda Mentari S Sitorus n.w, galuh cahyo pratiwi, yesina intan Purnijanto, Bambang Purnijanto, Bambang Purwanti, Hani Purwanto Purwanto Purwanto Purwanto RA, Andi Ainun Zuqny Nurin Setyati Budiningrum, Diah Sofaniadi, Safrinal Son haji, Son Sulistyaningsih, Ainaya Suwiyono, Timbul Catur Talitha Zhafira Talitha Zhafira Timbul Catur Suwiyono Trias Widorini Utama, Tegar Yogha yesina intan pratiwi