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All Journal Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain Indonesian Journal of Informatic Research and Software Engineering Journal of Sustainable Construction
Surya Sebayang
Universitas Lampung
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Transportation Other

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TINJAUAN SIFAT-SIFAT MEKANIK BETON ALIR MUTU TINGGI DENGAN SILIKA FUME SEBAGAI BAHAN TAMBAHAN Sebayang, Surya
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Flowing concrete flow under it own weight and maintain homogeneity while filling and passing around congested reinforcement. Flowing concrete is used to reduce or eliminate the need formvibration to reduce construction cost and reducing construction time. High strength flowing concrete in this research used silica fume as additive material in flowing concrete. The properties investigated are workability, concrete setting time, and compression strength. Proportion ofmaterial for concrete determined according to ACI 211-4R-1993 and combine with Hashimoto method. The addition of silica fume to the concrete are 0 %, 3%, 6%, 9%, 12% and 15% of the cement content. The test result indicated that effect of silica fume in fresh concrete was reduced the workability of the concrete. Addition of silica fume was made fresh concrete enough cohesiveness without causing segregation. Addition of silica fume was increased the initial andfinal setting time. The cylinder compression strength of silica fume flowing concrete at 7day,14 days, and 28 day was higher than compression strength of flowing concrete without silica fume at the same days. The optimum strength of silica fume flowing concrete was 51,35 MPa at 56 days age, in 9 % presence of silica fume.
PENGARUH AGREGAT KASAR BERGRADASI CELAH TERHADAP KUAT TEKAN BETON Irianti, Laksmi; Sebayang, Surya; Wibowo, Rivan Adlia
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The development of construction and transportation industrial shows significant increase together with the increases of people and the needs. Part of construction which increases significantly is concrete. In concrete making, aggregate gradation affects concrete strength a lot. Aggregate gra- dation can be categorized in 3 kinds that is continuous graded, uniform graded, and gap graded. The purpose of this research is to compare concrete pressure strength of gap graded aggregate and continuous graded aggregate. The research was done by making cylinder samples (d=150 mm, t=300 mm) with concrete pres- sure strength 17,5 MPa, 27,5 MPa and 37,5 MPa. Course aggregate variations which was used were 2 – 3,75, cm, 1 – 2 cm and 0,5 – 1 cm , 2 – 3,75 cm. The treatment of samples was done by drowning it into water and blowing it for 7 days. The samples were tested in 28 days. The result of the test was: (1) average concrete pressure strength with gap graded course aggre- gate was lower than concrete which used continuous graded course aggregate, (2) In concrete mixture with pressure strength 17,5 MPa, maximum load which can be hold by concrete with gap graded course aggregate was not so different from concrete with continuous graded course aggre- gate, (3) The higher pressure strength which was planned, the lower maximum load which can be hold by concrete with gap graded course aggregate, (4) There are differences between elasticity modulus values from this research and elasticity modulus from empirical formulas prediction in ACI 318-83M and Hognestad.
Pengaruh komposisi penambahan serat polypropylene terhadap kuat tekan dan kuat lentur self compacting mortar (SCM) Suma, Damas Novalda; Noorhidana, Vera Agustriana; sebayang, surya; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol 11, No 1 (2023): Edisi Maret 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractSelf compacting mortar is a mortar which is able to flow under its own weight and completely fill the formwork without the need for external compaction, while maintaining its homogeneity. This study aims to determine the effect of variations in the addition of polypropylene fiber to the compressive strength and flexural strength of self compacting mortar (SCM), as well as to determine the optimum variation of the addition of polypropylene fiber in mixed mortar. In this study, the test specimens were made with a water-cement factor of 0.4 and the ratio between cement and fine aggregate was 1:2.5 and the addition of 2% superplasticizer by weight of cement and the addition of polypropylene fibers with variations of 0%, 0.04%, 0.06%, 0.08%, 0.1% of the volume of the mortar test object. Tests were carried out on specimens aged 28 days. The results showed that the compressive strength of SCM experienced an optimum increase in the addition of 0.04% polypropylene fiber which was 34.81 MPa with an increase percentage of 14.07% of mortar without fiber, while the flexural strength of SCM increased with increasing variations of polypropylene fiber until the increase The optimum variation occurred at 0.1% polypropylene fiber, namely 11.72 MPa with a percentage increase of 26.05% from mortar without fiber. Key words : polypropylene fiber, superplasticizer, compressive strength, flexural strength.
Pengaruh Penggunaan Ordinary Portland Cement (OPC), Semen Modifikasi Jenis III dan Jenis IV, dan Portland Composite Cement (PCC) Terhadap Kuat Tekan Beton Prameswari Tw, Aqilla Regita; Irianti, Laksmi; Sebayang, Surya; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract Cement is one of the main materials used in making concrete. Cement is useful as a hydraulic binder when mixed with water. Based on the differences in usage characteristics and properties of cement, this research will discuss the effect of using OPC cement (type I), modified cement (type III and type IV), and PCC cement to see how the compressive strength of concrete develops over time with testing periods of 3 days, 7 days, 14 days, and 28 days. The research method used is an experimental study aimed at obtaining a comparison of compressive strength of concrete using OPC and PCC cement. The test specimens used are cylindrical in shape (diameter 150 mm and height 300 mm) with a total of 48 samples with 4 variations, each consisting of 3 samples. The planned concrete quality is 25 MPa. The highest compressive strength of concrete at 3 days, 7 days, 14 days, and 28 days is obtained by OPC cement, modified cement type III, PCC cement, and modified cement type III, while the lowest compressive strength of concrete at 3 days, 7 days, 14 days, and 28 days is obtained by modified cement type IV. Key words : cement, OPC cement, PCC cement, modified cement, compressive strength. AbstrakSemen merupakan salah satu bahan utama dalam pembuatan beton. Semen berguna sebagai perekat hidrolis ketika dicampur dengan air. Berdasarkan perbedaan karakteristik penggunaan dan sifat pada semen, maka penelitian ini akan membahas mengenai pengaruh penggunaan semen OPC (jenis I), semen modifikasi (jenis III dan jenis IV), dan semen PCCuntuk melihat bagaimana kuat tekan beton terhadap perkembangan umur beton dengan waktu pengujian beton berumur 3 hari, 7 hari, 14 hari, dan28 hari. Metode penelitian yang akan dilakukan adalah studi eksperimental yang bertujuan untuk mendapatkan hasil perbandingan kuat tekan beton pada semen OPC dan semen PCC. Benda uji yang digunakan berbentuk silinder (diameter 150 mm dan tinggi 300 mm) dengan sampel sebanyak 48 buah dengan 4 variasi yang masing-masing terdiri dari 3 sampel. Mutu beton yang direncanakan, yaitu 25 MPa. Kuat tekan beton terbesar pada umur 3 hari, 7 hari, 14 hari, dan 28 hari secara berturut diperoleh oleh semen OPC, semen modifikasi jenis III, semen PCC, dan semen modifikasi jenis III, sedangkan kuat tekan beton terkecil pada umur 3 hari, 7 hari, 14 hari, dan 28 hari diperoleh oleh semen modifikasi IV. Kata kunci : semen, semen OPC, semen PCC, semen modifikasi, kuat tekan.
Analisa Efektivitas Website Dinas Penanaman Modal Dan Pelayanan Perizinan Terpadu Satu Pintu Kabupaten Asahan Dengan Metode Webqual: Analysis of The Effectiveness of The Investment Office Website and One-Door Integrated Licensing Service of Asahan Regency With Webqual Method Sebayang, Surya
Indonesian Journal of Informatic Research and Software Engineering (IJIRSE) Vol. 2 No. 1 (2022): Indonesian Journal of Informatic Research and Software Engineering
Publisher : Institut Riset dan Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (545.366 KB) | DOI: 10.57152/ijirse.v2i1.150

Abstract

Perkembangan teknologi menuntut semua hal dapat dikerjakan dengan mudah, efisien, dan menghemat waktu. Begitu juga dengan dinas PMPPTSP (Penanaman Modal dan Pelayanan Perizinan Terpadu Satu Pintu) Kabupaten Asahan. Pada dinas ini diharuskan memiliki sebuah Website yang dapat memberikan informasi seputar penanaman modal, perizinan, dan lain-lain. Dengan begitu Website yang telah dibuat harus mudah dipahami dan sesuai dengan kebutuhan para pengguna yaitu masyarakat. Metode yang digunakan yaitu webqual sebagai pengukur kualitas website, menggunakan uji variabelitas dan Reliabelitas, serta uji paired sample test t-test. Hasil yang didapat dalam analisa ini merupakan bentuk kualitas website atau ke-efektifan website dengan nilai rata-rata kesenjangan antara dimensi usability, information quality, interaction quality, dan effectiveess adalah kurang dari -1.
Analisis Pengendalian Mutu Beton pada Proyek Rumah Susun PIK Pulo Gadung dengan Metode Statistical Quality Control Setiadi, Moch Sofyan; Usman, Kristianto; Sebayang, Surya; Kustiani, Ika
Journal of Sustainable Construction Vol 3 No 2 (2024): Journal of Sustainable Construction
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/josc.v3i2.7218

Abstract

Pertumbuhan penduduk terjadi begitu pesat sehingga menyebabkan permasalahan lahan perumahan. Rumah susun menjadi solusi hunian vertikal dengan memanfaatkan lahan secara efektif dan efisien, sesuai dengan SDGs (Sustainable Development Goals) nomor 11 yaitu menjadikan kota dan pemukiman inklusif, aman, berketahanan dan berkelanjutan. Sehingga diperlukan pengawasan agar kualitasnya terjaga. Tujuan penelitian adalah mengetahui kesesuaian mutu beton dari pelat, balok, kolom menggunakan metode Statistical Quality Control (SQC) serta faktor yang menyebabkan mutu beton sesuai/tidak dengan rencana. Pengendalian mutu dilakukan dengan pengujian kuat tekan. Hasil pengujian dianalisis dengan SQC. Dari analisis diperoleh hasil mutu beton dari pelat, balok, kolom memenuhi mutu rencana. Berdasarkan X-chart untuk pelat dan balok sesuai target 43,75%, dibawah target 25%%, keluar UCL 18,75%, keluar LCL 12,5%. Kolom fc’ 40 MPa sesuai target 63,64%, dibawah target 9,09%, keluar UCL 9,09%, keluar LCL 18,18%. Kolom Fc’ 30 MPa sesuai target 40%, dibawah target 20%, keluar UCL 20%, keluar LCL 20%. Berdasarkan R-chart untuk pelat dan balok sesuai target 43,75%, dibawah target 56,25%. Kolom fc’ 40 MPa sesuai target 45,45%, dibawah target 54,55%. Kesimpulannya berdasarkan X-chart memenuhi rencana, tetapi prosesnya tidak stabil. Berdasarkan R-chart prosesnya stabil dan terkendali. Besarnya variabilitas beton diindikasikan karena faktor air semen, curing dan kualitas pelaksanaan kurang sempurna.
Co-Authors Ika Kustiani Kristianto Usman Laksmi Irianti Mohd. Isneini Prameswari Tw, Aqilla Regita Rivan Adlia Wibowo, Rivan Adlia Setiadi, Moch Sofyan Suma, Damas Novalda Vera Agustriana Noorhidana