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All Journal International Journal of Electrical and Computer Engineering Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science KERN Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Jurnal Inovasi Bisnis (Inovbiz) Communications in Science and Technology Jurnal Aplikasi Teknik Sipil Engineering, Mathematics and Computer Science Journal (EMACS) Journal La Multiapp Sewagati
Ridho Bayuaji
Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember
Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Public Health Social Sciences Other

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Study of Using Paper Filter Whatman no.42 for Measuring Water Retention in Cement Paste Dora Melati Nurita Sandi; Indarto Indarto; Ridho Bayuaji; Januarti Jaya Ekaputri
IPTEK The Journal for Technology and Science Vol 27, No 3 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.664 KB) | DOI: 10.12962/j20882033.v27i3.1905

Abstract

This paper is study about using paper filter Whatman no.42 for measuring water retention on cement paste. The research is conducted as experiment in laboratory by making two types of specimens. The first speciment is cement paste with variation of water cement ratio and the second one is foam cement paste. There are two step for measuring water retention on cement paste. The first step is specimen immersed with immersion duration (t1). The second step is searching of filter paper weight to obtain water content after contact with two specimen. t1is time of consistency water content on specimens. The parameters (t1) must be searched before measuring water retention. The result of measurement water retention be shown in a curve.
Microwave Incinerated Rice Husk Ash Influence on Foamed Concrete Workability Ridho Bayuaji
Jurnal Aplikasi Teknik Sipil Vol 12, No 2 (2014)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.974 KB) | DOI: 10.12962/j12345678.v12i2.2580

Abstract

This paper presents the study of Microwave Incinerated Rice Husk Ash (MIRHA) Influence on Foamed Concrete (FC) Workability. The mix proportion of the MIRHA FC was designed using the Taguchi method with L16 orthogonal array with five parameters, namely, MIRHA contents, water cementitious ratio (w/c), sand cement ratio (s/c), superplasticizer (SP) content, and foam content. The workability of the foamed concrete was evaluated through spread measurement in accordance with ASTM-230. The results showed that FC incorporating MIRHA shows lower spread result than normal FC. MIRHA content has contribution 5-15% for workability which a stabled and consistent FC could be achieved. The contribution of MIRHA parameter to achieve the required workability of FC was 12.06%.
Concrete Structures Life Span Based on Carbonation Rate Using Artificial Neural Network MF Nuruddin; ABM Diah; TR Biyanto; M Sigit Darmawan; Ridho Bayuaji
Jurnal Aplikasi Teknik Sipil Vol 9, No 2 (2011)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.501 KB) | DOI: 10.12962/j12345678.v9i2.2774

Abstract

The study on the influence of carbonation on concrete is critical as it affects the life span of the concrete structure when corrosion of reinforcement takes place. This research elucidates the carbonation effect on concrete from different environments and concrete samples of grades 15, 20, 25, 30, 35, 40, and 50 MPa. Two set of samples were considered namely controlled sample in the laboratory and on sites samples. In conclusion, it was found that across the board on average, carbonation improved the concrete integrity by 11%. The development of the model using neural networks for the prediction of a carbonation penetration, which consists of two input variables and one output variable were presented. 
Studi Kuat Tekan Beton Porus sebagai Material Alternatif Batu Bata dengan Metode Taguchi Ridho Bayuaji
Jurnal Aplikasi Teknik Sipil Vol 12, No 1 (2014)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (335.609 KB) | DOI: 10.12962/j12345678.v12i1.2589

Abstract

Beton porus adalah beton ringan yang dibuat dari pasta semen atau mortar dan busa udara, tanpa ada unsur agregat kasar (AK). Penelitian terdahulu menunjukkan bahwa beton porus mempunyai fungsi material pengisi, bahan isolasi dan pemuliha ketinggian jalan raya. Salah satu kelebihan beton porus adalah variasi berat volume antara 400-1600 kg/m3 sehingga mengurangi beban mati. Busa udara yang dimasukkan dalam pasta semen atau mortar menghasilkan variasi densitas beton porus. Rongga atau pori dalam mortar perlu dilakukan studi untuk menjelaskan kuat tekan beton porus agar memenuhi persyaratan batu bata. Penelitian ini bertujuan untuk mengembangkan teknologi beton ringan, beton porus agar dapat diaplikasikan sebagai material alternatif pengganti batu bata. Desain eksperimen yang digunakan untuk mengoptimalisasi bahan penyusun BRF adalah menggunakan metode Taguchi, dengan 4 variabel dan 3 level. Benda uji beton ringan yang digunakan adalah silinder dengan diameter 150 mm dan tinggi 300 mm, dilakukan uji tekan dengan standar SNI-03-1974-1990 pada umur hidrasi 28 hari. Penelitian ini memberi kesimpulan beton porus mempunyai kuat tekan yang memenuhi mutu I kuat tekan tekan standar bata merah sebagai material alternatif pengganti batu bata.
Tipe Kerusakan Dinding Beton Non Pasir dengan Tulangan Horisontal Akibat Beban Lateral Bolak Balik Ridho Bayuaji
Jurnal Aplikasi Teknik Sipil Vol 9, No 2 (2011)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j12345678.v9i2.2775

Abstract

Pembuatan dinding dengan metode pasangan perlu ditinjau dengan metode pengecoran, yang mempunyai tujuan untuk membuat mutu material dinding sama/isotropik sehingga kelemahan yang terjadi pada dinding pasangan bisa teratasi, yaitu lemahnya sambungan antara material pasangan dengan mortar. Material yang dipilih adalah material yang mempunyai kekuatan di atas material pasangan dan tidak perlu mempunyai kekuatan yang signifikan seperti beton normal karena sifatnya hanya sebagai pengisi. Penelitian ini mengambil beton non pasir sebagai material pengecoran, memperhatikan berat jenisnya yang lebih ringan dari beton normal dan mendekati berat jenis dinding pasangan bata.Untuk mengetahui perilaku kerusakan dinding beton non pasir dan pengaruh perkuatan tulangan horisontal pada dinding beton non pasir, maka dilakukan penelitian terhadap dinding beton non pasir dengan pembebanan bolak-balik. Dua buah model struktur dinding beton non pasir dengan variasi yaitu satu buah dinding beton non pasir (Light Concrete Wall, LCW) dan satu buah dinding beton non pasir dengan tulangan horisontal (Light Concrete Wall with Horizontal Bars, LCWHB-200).Hasil penelitian menunjukkan bahwa pola keruntuhan pasca elastik pada dinding beton non pasir didominasi kerusakan rocking failure.
Initial Evaluation on Microwave Incinerated Rice Husk Ash (MIRHA) Foamed Concrete Using Neural Network Ridho Bayuaji
Jurnal Aplikasi Teknik Sipil Vol 11, No 2 (2013)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (189.654 KB) | DOI: 10.12962/j12345678.v11i2.2590

Abstract

The purpose of this study was to determine whether foamed concrete could achieve a strength requirement for structural application, while retaining its characteristics of low density, flowing workability and self-compacting. This investigation was focused on both designing compositions foamed concrete with pozzolanic material affect that has strength and density according to ASTM C 330. Neural network modelling, as observed, could enable the application of the mix proportion of foamed concrete to reach the compressive strength more than 17 MPa in which density was at 1400 kg/m3 with s/c of 0,5. 1600 kg/m3 with s/c 0,75 and 1800 kg/m3 s/c = 1. The neural networks model could be used as an alternative model in developing the tools to predicting the foamed concrete strength
Evaluasi Struktur Beton Outfall Condenser di PLTU Tarahan Muhammad Sigit Darmawan; Nur Achmad Husin; Ridho Bayuaji; Dicky Imam Wahyudi; Srie Subekti; Ibnu Pudji Rahardjo; Sungkono Karsidi; Sulchan Arifin; R. Buyung Anugraha Affandhie; Yuyun Tajunnisa
Sewagati Vol 4 No 3 (2020)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.497 KB)

Abstract

Sistem kerja PLTU menggunakan dua komponen, yaitu komponen utama dan komponen pendukung. Salah satu komponen pendukung adalah outfall discharge tunnel (outfall condenser). PLTU UPP Tarahan telah menetapkan PT ITS Tekno Sains (ITSTS) untuk melakukan assessment pada outfall condenser karena berada di lingkungan korosif dan telah beroperasi selama 12 tahun. Langkah assessment yang dilakukan yaitu (1) survei pendahuluan dan pengumpulan data sekunder, (2) survei lapangan, (3) pengujian lapangan dan pengambilan sampel (data primer), (4) melakukan pengujian di laboratorium, (5) melakukan pemodelan dan analisis struktur, (6) melakukan perhitungan sisa kekuatan struktur akibat korosi, (7) usulan metode perbaikan serta (8) estimasi biaya perbaikan. Hasilnya, retak pada outfall condenser pada hasil inspeksi visual umumnya dapat dimasukkan dalam kategori ringan dan hanya beberapa titik yang sudah masuk kategori berat karena tulangannya sudah mengalami korosi dan terbuka. Pengujian destructive maupun non-destructive menunjukkan kekuatan beton sudah diatas mutu yang direncanakan yaitu sebesar 21 MPa. Namun, hasilnya belum memenuhi syarat mutu beton untuk lingkungan air laut. Perkiraan kekuatan elemen struktur outfall condenser dengan memperhitungkan efek korosi menggunakan skenario average case yang menunjukkan tidak mengalami penurunan kekekuatan yang signifikan. Hasil assessment tes menyimpulkan bahwa kekuatan beton diatas mutu perencanaan yaitu 21 MPa, namun, hal tersebut masih belum memenuhi syarat mutu beton untuk lingkungan air laut. Perhitungan kekuatan elemen struktur memperhitungkan efek korosi dengan skenario average case. Hasil menunjukkan bahwa tahun 2020 kekuatan outfall condensor berkurang menjadi sebesar 91% dari kekuatan awal. Tahun 2025 menjadi sebesar 82%, dan tahun 2030 menjadi sebesar 74% dari kekuatan awal.
Fabrication and characterization of fly ash-based geopolymer and its performance for immobilization of heavy metal cations Iqbal, Rendy Muhamad; Supriadi, Warih; Burhan, R.Y. Perry; Nurherdiana, Silvana Dwi; Hidayati, Ririn Eva; Subaer, Subaer; Bayuaji, Ridho; Fansuri, Hamzah
Communications in Science and Technology Vol 7 No 2 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.2.2022.868

Abstract

In this study, the geopolymer from fly ash as based-raw material has been examined on the ability of several heavy metal ions immobilization. The fly ash has been provided from PT IPMOMI which firstly analyzed the physical and chemical properties. Fly ash and heavy metals were mixed with an activator base until homogeneous, then cast into a cylindrical shape mold following ASTM C 39-86 and left for 7 days. After that, the geopolymer was characterized by SEM, FTIR, XRD, compressive strength test and TCLP. The diffractogram of PT. IPMOMI fly ash exhibited the existence of mullite, alumina and iron oxide phase, which were suitable with XRF result. From FTIR spectra, the vibration on finger print area appeared indicating the vibration of T-O-T from geopolymer network. The observation revealed that the addition of Pb2+ cations caused microcracking from SEM image and affected the compressive strength of the geopolymer. Sr2+ was an ion that was very easilyleached compared to other three ions, and it caused a weak interaction between Sr2+ and geopolymer network. The higher amount of metal ions into the geopolymer network reduced the compressive strength of geopolymer. Sr2+-geopolymer had a lower compressive strength compared to Pb2+, Cd2+, and Co2+.
Feasibility Study of Coconut Oil Factory Business in Banyuasin Regency, South Sumatra Using a Feasibility Study Approach Priantama, Dimas Bayu; Bayuaji, Ridho
Inovbiz: Jurnal Inovasi Bisnis Vol 12, No 2 (2024)
Publisher : Politeknik Negeri Bengkalis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/inovbiz.v12i2.4129

Abstract

Coconut oil is a global commodity with increasing demand. Indonesia, as the world's largest producer of coconut oil, is still unable to meet market demand. Therefore, the construction of a domestic coconut oil processing factory is very necessary. This research aims to analyze the business feasibility of building a coconut oil factory in Banyuasin Regency, South Sumatra. The research methods used include analysis of internal and external aspects, IFAS-EFAS analysis, SWOT analysis, PESTEL analysis, and business model canvas. The results of the analysis show that in general this business is feasible considering the market prospects and availability of supporting raw materials.  the most influential internal factor is the availability of raw materials (coconut) due to the high demand for coconut oil, while production capacity still does not meet this need. Meanwhile, the most influential external factor is the demand for coconut oil, so demand becomes an opportunity in building a coconut oil factory.  The construction of a coconut oil factory in Banyuasin Regency can achieve success if it pays attention to influential internal and external aspects, as well as implementing strategies to exploit potential or prevent problems from the development.  A deep understanding of internal and external aspects will help factory makes the right decisions and ensure successful operations in Banyuasin Regency, South Sumatra.
Analysis of Time and Cost Planning and Control for Waterproofing Work in Project X Multi-Story Data Center Jakarta Ardiansyah, Giri Teguh; Bayuaji, Ridho; Asmi, Ade; Darmawan, Muhammad Sigit; Suswanto, Budi Suswanto
Journal La Multiapp Vol. 6 No. 4 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i4.2179

Abstract

Waterproofing plays a crucial role in maintaining a building's integrity. However, subcontractor skill limitations and project constraints such as design changes, site readiness, and resource shortages often cause delays. This study analyses the planning and time control of waterproofing work in the Building X High-Rise Data Center project, covering eight work items. Using the Precedence Diagram Method (PDM), the work schedule indicates an effective duration of 34 weeks. The analysis methods used include Critical Path Method (CPM), Earned Value Analysis (EVA), Program Evaluation Review Technique (PERT), and crashing for project duration optimization. By the 30th week, the calculation results showed a Schedule Performance Index (SPI) of 0.96 and a Schedule Variance (SV) of -Rp120,057,209.0, indicating project schedule delays. In terms of cost, the Cost Performance Index (CPI) was 0.99, and the Cost Variance (CV) was -Rp26,459,888.0, showing cost overruns, though still within a relatively controlled limit. The probability of project completion reached 90% by the 30th week. Optimization through acceleration methods proved effective in reducing project duration with controlled additional costs. Therefore, better mitigation strategies are needed to minimize time and cost deviations in similar future projects.
Co-Authors ABM Diah Ade Asmi Affandhie, R. Buyung Anugrah Agus Imam Sonhaji Agus Imam Sonhaji, Agus Imam Akhmad F. Alhikami Akhmad Faruq Alhikami Amaliya Rasyida Ardiansyah, Giri Teguh Darmawan, Muhammad Sigit Deris Faisa Ralindra Dicky Imam Wahyudi Dicky Imam Wahyudi Dora Melati Nurita Sandi Dwiki Pratama Putra Franky Kusuma Gunawan Nugroho Hamzah Fansuri Hendra Cordova Hidayati, Ririn Eva Hudiyo Firmanto, Hudiyo Husin, Nur Achmad Ibnu Pudji Rahardjo Ibnu Pudji Rahardjo Indarto Indarto Indarto Indarto Iqbal, Rendy Muhamad Januarti Jaya Ekaputri Joko Waluyo Junaedi, Nurhayati M Sigit Darmawan Mansur, Moh. Safi’i MF Nuruddin Muhammad Sigit Darmawan Muhammad Sigit Darmawan Nur Achmad Husin Nur Achmad Husin Priantama, Dimas Bayu R. Buyung Anugraha Affandhie R. Buyung Anugraha Affandhie R.Y. Perry Burhan, R.Y. Perry Rahardjo, Ibnu Pudji Ria Asih Aryani Soemitro Ridho Hantoro SATRIYAS ILYAS Silvana Dwi Nurherdiana Srie Subekti Subaer - Subekti, Srie Sulchan Arifin Sulchan Arifin Sungkono Karsidi Sungkono Karsidi Sungkono Sungkono Supriadi, Warih Susilo, Alfred Jonathan Suswanto, Budi Suswanto Suwandi Suwandi Totok R. Biyanto Totok R. Biyanto Totok R. Biyanto Totok R. Biyanto TR Biyanto Wicaksono, Sigit Tri Yerry Sutatio Yudoprasetyo, Kohar Yuyun Tajunnisa