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All Journal Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil BANGUN REKAPRIMA Journal of Computing Theories and Applications
Tedjo Mulyono
Jurusan Teknik Sipil Politeknik Negeri Semarang
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Transportation Other

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Pengaruh Penambahan Limbah Plastik Jenis Thermosetting Terhadap Parameter Marshall Laston AC-WC Kusdiyono Kusdiyono; Supriyadi Supriyadi; Tedjo Mulyono; Sukoyo Sukoyo
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 24, No 2 (2019): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v24i2.1733

Abstract

At present, plastic is a material that is needed by the community at large, where the impact is also very extraordinary after the plastic is used in everyday life which can cause serious problems if the management is not done properly. The problem of plastic waste does not only occur in the city of Semarang, but also in other cities, so that the Ministry of Environment and Forestry has implemented a paid plastic bag program in the short term. But this is only to deal with problems in the short term. In the long run, it will not solve the problem of "plastic waste", because the policy actually encourages people to buy plastic which, of course, will add a new burden for the community to buy it. Based on the above problems, it is necessary to utilize this plastic waste to be made into road pavement materials such as in the manufacture of Asphal Concrette Wearing Course, by making 5 mixed variations ranging from (2 to 10)% of the weight of the aggregate . This research was initiated through a survey process, material procurement, testing of stacking materials, making test specimens, testing specimens. The results of the research can show that the type of Thermosetting plastic waste has a significant influence on the Asphalt Concrete mixture AC-WC heat mixture, including: Density, Marshall Stability, Flow, VIM, VMA, MQ and the remaining Marshall Stability tend to show an increase, moderate VFA and VIMrefusal Density values tend to show a decrease. Thus the plastic waste from the Thermosetting type can be used as a partial replacement of the aggregate for the Asphalt Concrete mixture AC-WC heat mixture with a plastic waste content is limited to a maximum of 10% and at an optimum asphalt content of 5.55%. Thus this research is expected to be of benefit to the industry and the people of Semarang in relation to the use of plastic waste for road pavement.
Pengaruh Penambahan Fly Ash Dan Bottom Ash Terhadap Mutu Paving Kusdiyono Kusdiyono; Tedjo Mulyono; Supriyadi Supriyadi
Bangun Rekaprima Vol 3, No 2 (2017): Oktober 2017
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (589.847 KB) | DOI: 10.32497/bangunrekaprima.v3i2.861

Abstract

Fly ash dan bottom ash merupakan limbah padat dihasilkan sisa pembakaran batubara pada pembangkit listrik tenaga uap atau proses industri lainnya. Limbah padat ini terdapat dalam jumlah yang relatif besar, sehingga memerlukan pengelolaan yang serius agar tidak menimbulkan masalah pencemaran lingkungan, seperti pencemaran udara, perairan dan penurunan kualitas ekosistem lainnya. Fenomena yang terjadi, penanganan limbah ini tidak maksimal, terbukti masih adanya perusahaan membuang abu batu bara di Jalan lingkar selatan kota Salatiga (Suara Merdeka, 2012), limbah batu bara makan korban di Kayen, Pati (Sura Merdeka, 2012), kejadian seperti ini menunjukkan bahwa pengelolaan limbah padat dari industri tidak dikelola dengan baik. Sementara penelitian dibidang Rekayasa Bahan sudah banyak dilakukan oleh peneliti sebagai upaya untuk memecahkan permasalahan dan memanfaatkan limbah industri ini untuk dapat diproduksi menjadi industri lain seperti bahan bangunan. Hasil penelitian menunjukkan bahwa mutu paving (Bata beton) dengan bentuk empat persegi panjang dengan ukuran 60 mm x 100 mm x 200 mm dan model/jenis B2,5, B5, B7,5, B10, B12,5, B15, B17,5 dan B20 terdapat peningkatan kuat tekan rata-rata dibanding dengan model/jenis BN (tanpa penambahan fly ash dan bottom ash). Tertinggi pada penambahan fly ash dan bottom ash 5% dengan kekuatan tekan rata-rata mencapai 225,37 kg/cm² umur 14 hari, sedang penurunan terjadi pada penambahan fly ash dan bottom ash mulai dari 7,5% sampai 20% dengan penurunan kuat tekan rata-rata terendah 144,36 kg/cm² pada umur uji 14 hari. Persamaan regresi yang didapat Y= - 4,130 X² - 38,91 X + 117,2 dengan nilai korelasi R² = 0,766, artinya dengan penambahan fly ash dan bottom ash mempunyai pengaruh kuat terhadap kuat tekan paving (Bata beton). Sehingga diperoleh suatu gambaran bahwa dengan menambahkan fly ash dan bottom ash pada pembuatan paving (Bata beton) mutunya dapat menjadi lebih baik.Kata Kunci: Fly Ash, Bottom Ash, Pencemaran, Mutu Paving
KAJIAN RANCANG BANGUN ALAT UKUR DEBIT AMBANG LEBAR DENGAN VARIASI KEMIRINGAN HILIR Risman Risman; Warsiti Warsiti; Wasino Wasino; Mawardi Mawardi; Tedjo Mulyono
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 27, No 1 (2022): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v27i1.3749

Abstract

The modeling of broad crested weirs is expected to facilitate understanding, especially the behavior of the flow flowing through the measuring instrument. The flow behavior under consideration is hydraulic behavior, measurement accuracy, and discharge curve. In addition, there is a relationship between discharge and water level upstream and downstream of the spillway, as well as the relationship of the variation of discharge flowing through the broad crested weirs to the loss of energy height. From the results of this study, it was found that there was a relationship between discharge and water level upstream, downstream, water level above the threshold, and energy loss for wide-threshold spillway. The modeling of the broad crested weirs assumes that the Froude number that occurs in the model is the same as the Froude number that occurs in the field. So that the scale of discharge, time, velocity and volume will be able to represent the actual conditions in the field. The scale of length, width, and height of the prototype is 1: 100. The methodology used is to carry out testing in the hydraulics laboratory by varying Q1, Q2, Q3, Q4, …. Qn, to obtain variations in water level upstream and downstream of the broad crested weirs. From the results of the study, it was found that the energy loss was relatively small with a trend of Y = 101.66x2 - 0.7359x + 0.0017 with the slope of the broad crested weirs downstream is 1:2, Y = 467.84x2 - 1.7816x + 0.0022 for slope of the broad crested weirs downstream is 1:1.5, and Y = -1140,4x2 + 0.6383x + 0.0077 with the slope of the broad crested weirs downstream is 1:1 where Y is the energy loss in meters and X is the discharge in m3/sec.
PENINGKATAN KOMPETENSI TENTANG UJI KAPASITAS DUKUNG TANAH DI LAPANGAN UNTUK SISWA SMK NEGERI PRINGSURAT : PENINGKATAN KOMPETENSI TENTANG UJI KAPASITAS DUKUNG TANAH DI LAPANGAN UNTUK SISWA SMK NEGERI PRINGSURAT Aiun Hayatu Rabinah; Primasiwi Harprastanti; Jamal Mahbub; Garup Lambang Goro; Risman; Warsiti; Tedjo Mulyono; Imam Nurhadi; Muhamad Khudza Alfi Himam; Salmaa R. N Imansyah
Bangun Rekaprima Vol. 12 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v12i1.7636

Abstract

One of the challenges faced by students from SMKN Pringsurat in the civil construction implementation survey was related to field soil testing. Generally, SMKN Pringsurat students already have a basic understanding of civil engineering competencies, but still experience difficulties in several areas, particularly field soil testing. Therefore, to improve competency, training was conducted on the application of concrete testing in the field. The training focused on soil bearing capacity testing for SMKN Pringsurat. Based on questionnaire results, after the training, an average of >60% of SMKN Pringsurat students were able to correctly understand and understand the soil testing procedure in the field using the DCP tool, as well as how to analyze the test data. Direct training and intensive mentoring were effective methods, making it easier for students to absorb the material. 70% of students stated that the training was easy to understand.
Frozen DINOv2–CLIP Fusion and Binary Hashing for Remote Sensing Image Retrieval: A Controlled Evaluation Jumi J; Tedjo Mulyono; Achmad Zaenuddin; Suwardi Suwardi
Journal of Computing Theories and Applications Vol. 4 No. 1 (2026): JCTA 4(1) 2026
Publisher : Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/jcta.16661

Abstract

This study evaluates a controlled content-based remote sensing image retrieval pipeline that combines frozen vision foundation models with binary hashing. Across five stratified seeds on PatternNet and NWPU-RESISC45, calibrated DINOv2–CLIP score fusion achieved mAP values of 0.8143 ± 0.0007 and 0.5693 ± 0.0020, respectively, improving over the stronger single backbone by 0.0582 and 0.0514. The two similarity spaces were related but not redundant, with Spearman correlations of ρ = 0.510 and 0.515 across 200,000 sampled pairs. The contribution of texture features was dataset- and backbone-dependent: DINOv2–texture received a weight of 0.1 on PatternNet, whereas CLIP–texture and three-stream fusion assigned zero weight to texture; forcing texture into a 32-bit representation reduced mAP by 0.0147 and 0.0510. Among the unsupervised hashing methods, 64-bit iterative quantization (ITQ) exceeded the full-precision fused baseline by 0.0533 and 0.0445 mAP on PatternNet and NWPU-RESISC45, respectively. The corresponding paired parametric tests were significant, although the exact five-pair sign-flip test remained resolution-limited (p = 0.0625). A supervised CSQ-style head achieved mAP values of 0.9886 and 0.9087 at 64 bits; however, this improvement cannot be attributed to compression alone because gallery labels were used during training. In a controlled 200,000-vector benchmark constructed through deterministic repetition, 64-bit flat Hamming search required 1.6 MB and 0.674 ms/query, compared with 1.02 GB and 5.343 ms/query for 1,280-dimensional float vectors. Overall, the results support DINOv2–CLIP fusion and 64–128-bit ITQ as practical label-free choices, while restricting the scalability claim to the tested flat-search setting.
Co-Authors Achmad Zaenuddin Aiun Hayatu Rabinah Garup Lambang Goro Imam Nurhadi Jamal Mahbub Jumi J Kusdiyono Kusdiyono Mawardi Mawardi Muhamad Khudza Alfi Himam Primasiwi Harprastanti Risman Risman Risman Salmaa R. N Imansyah Sukoyo Sukoyo Supriyadi Supriyadi Supriyadi Supriyadi Suwardi - Suwardi Warsiti Warsiti Warsiti Wasino Wasino