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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Spektra: Jurnal Fisika dan Aplikasinya Jurnal Rekayasa Konstruksi Mekanika Sipil JURNAL SUMBER DAYA AIR Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan JMTS: Jurnal Mitra Teknik Sipil Jurnal Bakti Masyarakat Indonesia Prosiding Seri Seminar Nasional Jurnal Serina Abdimas
Widodo Kushartomo, Widodo
Universitas Tarumanagara
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Public Health Social Sciences Other

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CONSTRAINTS IN THE RECYCLED WASTEWATER UTILIZATION IN AN OFFICE BUILDING IN JAKARTA Kurniawan, Vittorio; Kushartomo, Widodo; Yolanda, Yolanda
JURNAL SUMBER DAYA AIR Vol 20, No 1 (2024)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v20i1.879

Abstract

 The threat of water scarcity and the progressing technology in sewage treatment plants promote the reuse of recycled wastewater. While the practice itself is beneficial, there are still issues to be solved to utilize its full potential. This study focuses on identifying the bottlenecks or limiting factors in implementing the practice on a building scale. An office building was researched to reveal its water usage pattern. The building introduces a sewage treatment plant so the sewage can be recycled into usable freshwater. The analysis indicates the produced recycled wastewater has not been fully utilized until now. While the volume of the water demand is greater than the recycled wastewater, several factors hinder the total utilization of the reclaimed water. The recycled wastewater is mostly more than enough to cover the water usage for both gardening and toilet flushing, the usages still leave an excess of water for other purposes. Because of the constraints in water quality, finance, and public reception, the excess reclaimed water is yet to be optimally utilized. Firstly, the quality of the reclaimed water is not very convincing to be used for non-flushing human usage and cooling towers. Secondly, the high cost of the investment and the overhaul of the plumbing system (for old buildings) deters the practice of reusing the reclaimed water. Thirdly, many people still have terrible perceptions about reused wastewater thus they would hesitate to utilize it even if the reused water is technically fine.  Keywords: recycled wastewater, sewage treatment plant, office building, water conservation, rainwater harvesting 
PELAT PANEL REACTIVE POWDER CONCRETE SEBAGAI LANDASAN PERALATAN PERMAINAN ANAK Kushartomo, Widodo; Andryanto, Jonathan; Aaron, Jonathan; Carolina, Octavia
Jurnal Serina Abdimas Vol 1 No 1 (2023): Jurnal Serina Abdimas
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jsa.v1i1.23841

Abstract

Reactive Powder Concrete (RPC) is a material that has excellent mechanical properties. From various studies that have been carried out, it shows excellent mechanical properties, namely the compressive strength can reach 200 MPa and fracture toughness can reach above 30 MPa. The enormous compressive and flexural strength allows RPC to be used in various building structural elements such as beams, columns or plates or other uses. RPC is able to answer the challenges of the building construction industry to create very tall buildings and very long spans. With enormous power, the RPC can be designed in a slim way so that it can reduce its own burden very significantly. The research team of the Undergraduate Civil Engineering Study Program, Tarumanagara University, has developed RPC technology and is able to produce compressive strengths above 150 MPa and fracture toughness reaching above 30 MPa. The research team is also developing RPC applications in various applications such as retrofitting, bamboo joints and so on. The PkM team for the Civil Engineering Undergraduate Study Program, Tarumanagara University partnered with residents of RW 07, Banjar Wijaya Housing, Cipete Village, Pinang District, Tangerang City. Partners have problems placing children's play equipment in the form of swings, slides and monkey bars on a thin but strong platform. Based on the residents' difficulties in making a thin but strong foundation, the PkM team of the Department of Civil Engineering at Tarumanagara University used RPC technology to make panel plates as the basis for thin and strong children's play equipment. Reactive Powder Concrete (RPC) merupakan material yang mempunyai sifat mekanik sangat baik. Dari berbagai penelitian yang telah dilakukan menunjukkan sifat mekanis yang sangat baik yaitu kekuatan tekan mampu mencapai 200 MPa dan fracture toughness mampu mencapai diatas 30 MPa. Kekuatan tekan dan lentur sangat besar tersebut memungkinkan RPC digunakan dalam berbagai elemen struktur bangunan seperti sebagai balok, kolom ataupun pelat atau penggunaan lainnya. RPC mampu menjawab tantangan industri konstruksi bangunan untuk membuat bangunan yang sangat tinggi dan bentang yang sangat Panjang. Dengan kekuatan sangat besar RPC dapat didesain dengan ramping sehingga mampu mengurangi bebannya sendiri dengan sangat signifikan. Tim peneliti Program Studi Sarjana Teknik Sipil Universitas Tarumanagara, telah mengembangkan teknologi RPC dan mampu menghasilkan kekuatan tekan di atas 150 MPa dan fracture toughness mencapai di atas 30 MPa. Tim peneliti juga mengembangkan aplikasi RPC pada berbagai penggunaan seperti retrofit, sambungan bambu dan sebagainya. Tim PkM Program Studi Sarjana Teknik Sipil Universitas Tarumanagara bermitra dengan warga RW 07 Perumahan Banjar Wijaya Kelurahan Cipete Kecamatan Pinang Kota Tangerang. Mitra mengalami kendala menempatkan peralatan permainan anak berupa ayunan, seluncuran dan monkey bar pada landasan yang tipis namun kuat. Berdasarkan kesulitan warga untuk membuat landasan yang tipis namun kuat, tim PkM Jurusan Teknik Sipil Universitas Tarumanagara menggunakan teknologi RPC untuk membuat plat panel sebagai landasan peralatan permainan anak yang tipis dan kuat.
PENGGUNAAN PANEL RINGAN UNTUK PAGAR PEMBATAS LINGKUNGAN PERUMAHAN BANJAR WIJAYA RW 07 KELURAHAN CIPETE, KECAMATAN PINANG, KOTA TANGERANG Kushartomo, Widodo; Hauwendy; Boenyamis, Michael Silvester; Tanurahardja, Edward Mahendra; Christopher
Jurnal Serina Abdimas Vol 2 No 1 (2024): Jurnal Serina Abdimas
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jsa.v2i1.29207

Abstract

Concrete panel fences installed at locations aim to limit land ownership from one another, provide visual protection for the object being fenced and provide a feeling of security to the land owner. The Banjar Wijaya housing complex, especially RW 07, Cipete Village, Pinang District, Tangerang City borders residential areas which are separated by concrete panel fences. The guardrail that divides the RW 07 neighborhood from residents is approximately 500 m long. In several locations of the guardrail, there was damage to the fence, such as broken, missing and holes. Residents' difficulties in finding cheap quality concrete panel fences in the sense of being strong and light, can be overcome by using lightweight concrete panels which are the result of research from the Concrete Construction and Technology Laboratory of Tarumanagara University's Civil Engineering Undergraduate Study Program. The PkM Team from Tarumanagara University's Civil Engineering Undergraduate Study Program guided the manufacture of lightweight concrete panel prototypes which can then be carried out by the community themselves. The implementation of PkM activities was carried out together with the local community, which included preparation for making light panels and installing them.
PENGARUH SERAT BAJA TERHADAP TEGANGAN SISA SCC PASCA PEMBAKARAN Philipus Hermawan; Widodo Kushartomo; Louis Sutomo Limbo
JMTS: Jurnal Mitra Teknik Sipil Volume 9, Nomor 2, Mei 2026
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v9i2.37378

Abstract

High-rise building infrastructure requires high-strength Self-Compacting Concrete (SCC). This material supports Sustainable Development Goal (SDG) 11 to create safe and disaster-resilient cities. However, a 600°C temperature triggers concrete strength degradation due to chemical decomposition and aggregate expansion. This study evaluates the effect of 3D hooked-end steel fibers (aspect ratio 65, length 35 mm) at 0%, 0.5%, 1%, and 1.5% variations on concrete workability and post-fire residual strength. The research uses a laboratory experimental method. Test specimens include 100x200 mm cylinders and 100x100x400 mm beams. Researchers cured the samples in water for 28 days before mechanical testing. Researchers then heated the samples at 600°C for 2 hours. Test results show the 1.5% fiber addition decreased slump flow from 670 mm to 595 mm. At normal temperature, compressive strength increased from 40.58 MPa (0%) to 47.77 MPa (1.5%). Flexural strength rose from 5.83 MPa (0%) to 9.50 MPa (1.5%). After the 600°C fire exposure, the concrete degraded. Residual compressive strength dropped to 44.46% (0%) and 59.41% (1.5%). Residual flexural strength dropped to 18.64% (0%) and 62.40% (1.5%). Adding steel fibers to SCC minimizes the negative impacts of high-temperature exposure compared to unreinforced SCC. Abstrak Infrastruktur gedung tinggi membutuhkan Self-Compacting Concrete (SCC) mutu tinggi, sejalan dengan Sustainable Development Goals (SDGs) 11 untuk mewujudkan kota tahan bencana. Namun, suhu 600°C memicu degradasi kekuatan beton akibat dekomposisi kimia dan pemuaian agregat. Penelitian ini mengevaluasi pengaruh serat baja hooked-end 3D (rasio 65, panjang 35 mm) dengan variasi 0%, 0,5%, 1%, dan 1,5% terhadap workabilitas dan kekuatan sisa beton pascabakar. Metode penelitian menggunakan eksperimen laboratorium. Benda uji terdiri dari silinder (100x200 mm) dan balok (100x100x400 mm). Sampel dirawat di dalam air selama 28 hari sebelum pengujian mekanis. Sampel lalu dibakar pada suhu 600°C dan ditahan selama 2 jam. Hasil uji menunjukkan penambahan serat 1,5% menurunkan slump flow dari 670 mm menjadi 595 mm. Pada suhu normal, terjadi peningkatan kuat tekan dari 40,58 MPa (kadar 0%) menjadi 47,77 MPa (kadar 1,5%). Kuat lentur naik dari 5,83 MPa (kadar 0%) menjadi 9,50 MPa (kadar 1,5%). Pasca pembakaran 600°C, beton mengalami degradasi mutu. Kuat tekan sisa SCC turun menjadi 44,46% (kadar 0%) dan 59,41% (kadar 1,5%). Kuat lentur sisa turun menjadi 18,64% (kadar 0%) dan 62,40% (kadar 1,5%). Penambahan serat baja pada SCC dapat meminimalisir dampak negatif yang disebabkan oleh paparan suhu tinggi daripada SCC yang tidak berpenguat serat baja.
PENGARUH TEMPERATUR PEMBAKARAN TERHADAP SIFAT MEKANIK SCC BERPENGUAT SERAT BAJA Louis Sutomo Limbo; Widodo Kushartomo; Philipus Hermawan
JMTS: Jurnal Mitra Teknik Sipil Volume 9, Nomor 3, Agustus 2026
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v9i3.37383

Abstract

High-strength Self-Compacting Concrete (SCC) reinforced with 1% steel fiber was investigated for its mechanical degradation at elevated temperatures of 25°C, 400°C, 500°C, and 600°C. The experimental study was conducted at Universitas Tarumanagara's Construction and Concrete Technology Laboratory using cylindrical specimens (10cm x 20cm) for compressive strength tests and beam specimens (10 cm × 10 cm × 40 cm) for flexural strength tests. Specimens were heated to target temperatures with a 2-hour dwelling time and allowed to cool naturally. Results show that at 25°C, adding 1% steel fiber decreased compressive strength by 23.3% (from 40.58 MPa to 31.14 MPa) while increasing flexural strength by 23.0%. At 600°C, steel-fiber-reinforced SCC retained 68.2% compressive strength and 60.8% flexural strength compared to only 44.5% and 18.6% for plain SCC. Visual observations confirmed progressive color changes from gray (25°C) to yellowish-gray (400°C), pale cream (500°C), and pinkish-brown (600°C), indicative of thermal decomposition phases. Steel fiber reinforcement effectively mitigated explosive spalling risk by creating micro-channels for steam release, demonstrating that 1% steel fiber significantly enhances post-fire structural integrity of high-strength SCC. Abstrak Self-Compacting Concrete (SCC) mutu tinggi berpenguat serat baja 1% diteliti degradasi sifat mekaniknya pada suhu 25°C, 400°C, 500°C, dan 600°C. Penelitian eksperimental dilaksanakan di Laboratorium Teknologi Konstruksi dan Beton Universitas Tarumanagara menggunakan benda uji silinder (10cm x 20cm) untuk uji tekan dan balok (10 cm × 10 cm × 40 cm) untuk uji lentur. Benda uji dipanaskan hingga suhu target dengan waktu tahan 2 jam kemudian didinginkan secara alami. Hasil penelitian menunjukkan bahwa pada suhu 25°C, penambahan serat baja 1% menurunkan kuat tekan sebesar 23,3% (dari 40,58 MPa menjadi 31,14 MPa) namun meningkatkan kuat lentur 23,0% (dari 5,83 MPa menjadi 7,17 MPa). Pada suhu 600°C, SCC berpenguat serat baja masih mempertahankan 68,2% kuat tekan dan 60,8% kuat lentur, jauh lebih baik dibandingkan SCC tanpa serat yang hanya menyisakan 44,5% dan 18,6%. Pengamatan visual mengkonfirmasi perubahan warna progresif dari abu-abu (25°C), abu-abu kekuningan (400°C), krem pucat (500°C), hingga cokelat kemerahan (600°C) yang mencerminkan tahapan dekomposisi termal. Serat baja terbukti efektif meminimalisasi risiko explosive spalling dengan menciptakan jalur mikro pelepasan uap air, membuktikan bahwa kadar serat 1% secara signifikan meningkatkan integritas struktural SCC mutu tinggi pasca kebakaran.
STUDI OVERSTRENGTH BETON MUTU F’C 65 MPA PENAMBAHAN MATERIAL AKIBAT KADAR AIR AGREGAT David Wibowo; Basuki Anondho; Widodo Kushartomo; Arianti Sutandi
JMTS: Jurnal Mitra Teknik Sipil Volume 9, Nomor 3, Agustus 2026
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v9i3.37384

Abstract

The phenomenon of overstrength in concrete has become an important issue in construction management, particularly because it is closely related to material efficiency and environmental sustainability. This study aims to analyze the occurrence of the overstrength phenomenon and to calculate the material inefficiency and reduced profit arising from deviations in the use of operational materials from the mix design during the concrete production process at Batching Plant X. The data used in this study were obtained from compressive strength test results of f'c 65 MPa concrete cylinders at 28 days of age, supplied directly by Batching Plant X on Project X. Data analysis was carried out descriptively and quantitatively by comparing the actual field compressive strength with the Target Mean Compressive Strength (f'cr) planned in accordance with the SNI 2847:2013 specification guidelines. The results prove that deviations in mix proportions, particularly material additions due to corrections in aggregate water content that caused the ready mix party to use materials exceeding the initial design requirements, contribute directly to the occurrence of the overstrength phenomenon. This technically confirms the existence of material consumption inefficiency, which results in the wastage of material quantities as well as a decrease in production profit. Therefore, this study calculates the magnitude of the profit reduction resulting from this material inefficiency. This research is in line with the Sustainable Development Goals (SDGs) point 9, Industry, Innovation and Infrastructure, specifically target 9.4 concerning improving the efficiency of resource use in the construction industry to make it more sustainable and lower in carbon emissions. Abstrak Fenomena overstrength pada beton menjadi isu penting dalam manajemen konstruksi, khususnya karena berkaitan erat dengan efisiensi material dan keberlanjutan lingkungan. Penelitian ini bertujuan untuk menganalisis terjadinya fenomena overstrength serta menghitung inefisiensi material dan berkurangnya keuntungan yang timbul akibat penyimpangan pemakaian material operasional terhadap rancangan pada proses produksi beton di Batching Plant X. Data dalam penelitian ini bersumber dari hasil pengujian kuat tekan silinder beton mutu f'c 65 MPa pada umur 28 hari yang dipasok langsung oleh Batching Plant X pada Proyek X. Analisis data dilakukan menggunakan pendekatan statistik parametrik melalui metode One-Sample T-Test untuk membuktikan apakah hasil kuat tekan aktual di lapangan melampaui kuat tekan rata-rata perlu (f'cr) yang direncanakan berdasarkan pedoman spesifikasi SNI 2847:2013. Hasil analisis membuktikan bahwa deviasi pada proporsi campuran, terutama penambahan material akibat koreksi kadar air agregat yang menyebabkan pihak ready mix menggunakan material melebihi kebutuhan desain awal, berkontribusi langsung pada terjadinya fenomena overstrength. Dengan ini secara teknis mengonfirmasi adanya inefisiensi konsumsi material yang berdampak pada pemborosan kuantitas bahan sekaligus penurunan keuntungan produksi. Oleh karena itu, penelitian ini menghitung besarnya penurunan keuntungan yang ditimbulkan akibat inefisiensi material tersebut. Penelitian ini sejalan dengan Sustainable Development Goals (SDGs) poin ke-9, Industry, Innovation and Infrastructure, khususnya target 9.4 mengenai peningkatan efisiensi penggunaan sumber daya pada industri konstruksi yang lebih berkelanjutan dan rendah emisi karbon.
Co-Authors Aaron, Jonathan Agustinus Eppendie Alberto Pandapotan Habeahan Alfredo Samuel Andryanto, Jonathan Andy Prabowo Anissa Noor Tajudin, Anissa Noor Anthony Wisselly Arif Sandjaya Arles Octavianus Sintiawan Basuki Anondho Boenyamis, Michael Silvester Bramantyo Dipo Harsono Brian Mamahit Carlos Chandra Carolina, Octavia Chaidir Anwar Makarim Chaidir Anwar Makarim, Chaidir Anwar Charles Brianjaya Christian, Marco Christopher Christopher Kevin Sidharta Daniel Christianto David Wibowo Dewi Permata Sari Evert, Ezra FX. Supartono FX. Supartono, FX. Hauwendy Henny Wiyanto Hernandez, Hizkia Hokbyan Angkat Jenny Suryani John, Tory Jonathan Aaron Jonathan Andryanto Kevin KURNIAWAN, RIVALDO Kurniawan, Vittorio Leksmono Suryo Putranto Linggasari, Dewi Linggasari, Dewi Louis Sutomo Limbo Marco Christian Najid Najid Ni Luh Putu Shinta Eka Setyarini Octa Rianto Octavia Carolina Owen, Frigion Philipus Hermawan Prem Singh Saputra, Stanley Jourdan Saputra, Stenley Jordan Seehan Kuo Setyarini, Ni Luh Shinta Eka Sugandar Sumawiganda Sugandar Sumawiganda, Sugandar Suryana, Laurensius Evan Suryani, Jenny Sutandi, Arianti Sutandi, Arianti Tanurahardja, Edward Mahendra Varian, Mikhael Wijaya, Jevin William, Lie Jorge Yolanda Yolanda, Yolanda Yosafat Kurnia Adi Zahwa Nur Raudah