EVALUASI KINERJA INSTALASI PENGOLAHAN AIR LIMBAH RSD MANGUSADA KABUPATEN BADUNG

The Mangusada Regional General Hospital (RSD) as a provider of health facilities certainly produces liquid waste in every operational activity. Wastewater in the Wastewater Treatment Installation (WWTI) RSD Mangusada contains Biological Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), ammonia, total coliform, Total Dissolved Solid (TDS), detergent, oil and fat. This study aims to evaluate the performance of the WWTI as well as to determine the content in the wastewater after being treated by the IPAL RSD Mangusada according to the reference quality standards of the Governor of Bali Regulation No.16/2016 and Regulation of the Minister of Environment and Forestry of the Republic of Indonesia Number: P.68/Menlhk/Setjen/Kum.1/8/2016. The wastewater treatment system at RSD Mangusada uses a biological system. The data used in the analysis are secondary data, namely the Bed Occupation Rate (BOR) data in June 2020, the total number of beds, the average discharge of outlets in June 2020 and parameters of the quality and quantity of wastewater in the inlet and outlet of WWTI from January 2020 to July 2020. Based on the results of testing the quality and quantity of wastewater at the WWTI of RSD Mangusada outlet, the content of waste water in the outlet of WWTI is in accordance with the regulatory standards for the reference quality standards. In addition, the effectiveness of the efficiency of the WWTI at RSD Mangusada succeeded in reducing the ammonia content of 92.35%, BOD5 64.03%, COD 63.97%, TSS 67.03%, oil and fat 64.64%, total coliform 76.84%. , and detergent at 76.25%. But the efficiency of the WWTI of RSD Mangusada was not good enough in reducing the TDS content of -3.92%.

PENGGUNAAN PASIR GALIAN (MATERIAL LOKAL) DI KABUPATEN MERAUKE – PAPUA SEBAGAI KOMPONEN PENYUSUN MORTAR

One of the infrastructure developments by the Indonesian government is in Merauke Regency. However, the availability of high-quality materials must be imported from outside, which results in high prices and long delivery times. Alternative construction materials continue to be sought and developed, such as the use of local materials. The aim of this research is to determine which sand is the best as mortar mixture. This mortar study used 3 (three) sands from quarries in Merauke, namely Onggari-1, Bupul-5, and Senayu. The ratio of mortar constituent between cement and sand is 1:2 with FAS 0.4, with 5x5x5 cm test object. The properties of each sand tested in original condition while the mortar compressive strength test was carried out at the age of 8 days, 14 days and 28 days. The mortar also will be tested for volume weight, specific gravity, and water absorption. The analysis results showed Onggari-1 met most of all the properties specifications for concrete with clay particles less than 5%, low organic impurities, and well-graded. The compressive strength achieved by Onggari-1 was the highest at 38,45 MPa, followed by Senayu at 26,01 MPa and Bupul-5 at 19,44 MPa at the age of 28 days. The highest increase in quality of each sand occurred at the age of 14 days. Sand from Senayu and Bupul-5 need maintenance in the form of washing the sand and repairing the gradation. Overall, all sands can be used as masonry work that bear large loads such as exterior and interior walls.

PENGGUNAAN ECOPAL SEBAGAI BAHAN TAMBAH PADA CAMPURAN HANGAT AC-WC

Campuran beraspal hangat (Warm Mix Asphalt/WMA) mulai dikembangkan karena lebih ramah lingkungan dibandingkan dengan campuran beraspal panas (Hot Mix Asphalt/HMA). Zeolit dapat dimanfaatkan sebagai bahan tambah pada WMA, karena sifatnya yang dapat menyimpan air sehingga pencampuran dan pemadatan pada WMA dapat dilakukan pada suhu yang lebih rendah dibanding HMA. Pusat Penelitian Pengembangan Jalan dan Jembatan (Pusjatan) turut mengembangkan teknologi WMA dengan memproduksi WMA Zeolit yang diberi nama ECOPAL. Penelitian ini bertujuan untuk mengetahui karakteristik dan pengaruh penambahan ECOPAL pada campuran Asphalt Concrete Wearing Course (AC-WC) dengan variasi ECOPAL 0,5%; 1%; 1,5%; 2%; 2,5% pada kadar aspal optimum (KAO). Pencampuran dilakukan pada suhu ±130oC, pemadatan suhu ±115oC, dan hasil penelitian menunjukkan setiap penambahan ECOPAL sebesar 0,5% meningkatkan nilai rata-rata stabilitas sebesar 14,85%; VFB 1,44%; dan kepadatan 0,22%. Sebaliknya, nilai VIM dan VMA cenderung mengalami penurunan, yaitu berturut-turut sebesar 4,34% dan 1,18%, sedangkan nilai flow tidak menunjukkan pola yang teratur terhadap kadar penambahan ECOPAL. Secara keseluruhan, terdapat beberapa campuran yang tidak memenuhi spesifikasi Bina Marga 2018. Nilai stabilitas dan Marshall Quotient pada kadar ECOPAL 0,5%-1,5% tidak memenuhi spesifikasi. Di samping itu, nilai VIM pada kadar ECOPAL 0,5% juga tidak memenuhi spesifikasi. Campuran dengan kadar ECOPAL 2,5% menghasilkan karakteristik terbaik, yaitu dengan nilai stabilitas 1101,91 kg; flow 3,13 mm; MQ 351,5 kg/mm; VIM 4,304%; VMA 15,374%; VFB 72,012%; serta kepadatan 2,226 gr/cm3. Nilai-nilai ini mendekati karakteristik AC-WC pada campuran panas. Kata Kunci: AC-WC, warm mix asphalt (WMA), zeolit, ECOPAL

3-DIMENTIONAL MODELING OF CYLINDRICAL CONCRETE UNDER AXIAL COMPRESSION WITH VARIATIONS OF MESH ELEMENT TECHNIC AND EFFECT OF REDUCED INTEGRATION

Research with numerical methods using computer programs has increased in recent years in various fields including the field of structural materials. However, this numerical analysis still needs to be developed in terms of modeling techniques in order to get the results according to the real condition. In this paper, modeling of concrete-cylinder with numerically method using a finite element based computer program, Abaqus®, presented.. Modeling technique to inventigate the mesh element technique and the reduced integration on hourglass control. Modeling specimen is in the form of cylindrical concrete measuring 150 mm x 300 mm with a quality of 25 MPa. Concrete plastic behavior is modeled with the concrete damage plasticity (CDP) feature. The results of the analysis show that the reduction-integration of hourglass control gives a lower peak load effect when the material passes the elastic limit. Meanwhile, a better mesh technique is to use 8-noded hexahedral because it is more stable and the reduction-integration effect of hourglass control can work.

ANALISIS DEFORMASI LATERAL GRUP PONDASI TIANG DENGAN PERKUATAN MENGGUNAKAN TIANG MIRING (BATTER PILES) PADA JEMBATAN DERMAGA

ABSTRACT: Lateral deformation of group piles foundation is one of the parameters that must be considered properly, excessive lateral deformation can cause damage to the structure. In bridge structures, cases of excessive lateral deformation often occur which potentially affect the reliability of the bridge and cause damage to the structure. When the lateral deformation that occurs in the foundation group exceeds the safety limit, it needs additional reinforcement designed to provide additional lateral resistance, so that the deformation that occurs can be reduced and the strength of the structure also increases. Reinforcement using inclined piles (batter piles) can be used in increasing the lateral resistance of the group piles foundation. The use of batter piles mechanically distributes the horizontal load to the vertical direction of the foundation, so that the lateral load that carried by the foundation is distributed into vertical and horizontal components, to reduce the lateral deformation that occurs. In this study, the lateral deformation analysis was carried out on the group piles foundation on the jetty bridge which experienced a large deformation, then a reinforcement design was designed using batter piles to increase lateral resistance. The analysis was performed using PLAXIS 2D and GROUP software. From the analysis, it was found that reinforcement using batter piles can reduce the lateral deformation that occurs and increase the stability of the bridge..Keywords: batter piles, lateral deformation, lateral resistance

PEMODELAN ALIRAN AIRTANAH UNTUK SISTEM MANJEMEN DAN PEMBANGUNAN DI KAWASAN PERKOTAAN KABUPATEN MAJENE, PROVINSI SULAWESI BARAT

Model air tanah yang digambarkan komputer merupakan sebuah representasi dari keadaan sebenarnya yang mewakilinya di lapangan, sehingga dapat berfungsi sebagai monitoring dan perkiraan suatu sistem aliran air tanah di masa depan. Tujuan dari penelitian ini adalah pemodelan aliran air tanah yang dapat mewakili kondisi sebenarnya yang terjadi di kawasan perkotaan Kabupaten Majene. Pemodelan dilakukan dengan cara numerik menggunakan Visual Modflow. Data masukan yang dibutuhkan adalah : korelasi data logbor/geolistrik, batas (boundary) lokasi penelitian yang akan dimodelkan yaitu river boundary, pengukuran serta pengamatan kondisi sungai sebagai river boundary, data imbuhan air tanah (infiltrasi) diperoleh dengan menggunakan neraca air tanah dari olahan data curah hujan dan suhu udara, pengukuran tinggi muka air tanah sebagai penentuan alat validasi model untuk mendekati kondisi nyata di lapangan. Hasil dari penelitian ini berupa model aliran air tanah yang dapat digunakan untuk sistem manajemen air tanah sebagai alat pengambilan keputusan bagi pihak perencana proyek dan lembaga pemerintah dalam memprediksi perubahan sistem aliran air tanah, penentuan lokasi pembangunan dan dapat sebagai monitoring intrusi air laut di masa depan sebagai perkotaan yang berada di pinggir pantai.

TEGAL BESAR BEACH REHABILITATION WITH SCALLOPED CONCRETE BLOCK REVETMENT

Klungkung has a coastline of 113 km out of a total of 5780.06 km2 the coastline in the province of Bali, but about 25 km is eroded. One of the critical areas occurs in Tegal Besar beach which caused erosion of 0.08875 to 3.0915 m/yr. Revetment with scalloped concrete blocks is expected to protect land from the wave attack. Concrete blocks have uniform size and shape, showing the aesthetic aspect so as not damage the beauty of the beach. Analysis of wind, tidal, bathymetry and soil data are carried out to obtain the structure and stability of the revetment. The results of this design can be used to rehabilitate the condition of the Tegal Besar beach. From the analysis, the design wave height with a return period of 25 years (H25) = 0.891 m, while the height with the breaking wave (Hb) = 1.003 m and the breaking wave depth (db) = 1.068 m and the design water level elevation (DWL) = 2.061 m calculated from MSL. The revetment structure has a height of 4.00 m, a peak width of 1.50 m, the weight of the first layer of protection is 300 kg and the second is 30 kg with a thickness of 1.00 m. Toe protection are 1.25 m high, 3.00 m wide and weigh 150 kg. The results showed that the revetment was stable against overturning, shearing, and the bearing capacity of the soil was declared safe with the results of overturning stability 22,075 > 2, slidding stability 2.249 > 1.5 and the bearing capacity of the soil 57,993 > 3 so that the revetment can be eligible to be applied at the site.

PENGARUH VARIASI MUTU JAKET BETON DAN PENAMBAHAN TULANGAN LATERAL TERHADAP KAPASITAS AKSIAL KOLOM BUJUR SANGKAR

Many researches have been carried out regarding concrete jacketing, such as the addition of stirrup reinforcement and enlargement of dimensions with the quality of the concrete jacket that is equal or exceeds the quality of the core column concrete. To determine the effect of concrete jacket quality and the addition of stirrup reinforcement to the axial column capacity, in this study, the core column (K25) with 25 MPa quality and the quality of the concrete jacket varied 20 MPa, 25 MPa, 30 MPa, with the addition of stirrup reinforcement (KJs column) and without the addition of stirrup reinforcement (KJ column) in each variation of the quality of concrete jackets. It made 3 colomn for each type of treatment. The core column has a square shape with dimensions 80 x 80 x 320 mm and a concrete reinforcement jacket is given with dimensions 160 x 160 x 300 mm. The column is given concentric axial load and the shortening is calculated using a dial gauge for every 20 kN load. The results of this study indicate the addition of jacket and stirrup reinforcement concrete can increase axial capacity and column ductility. As for the increase in axial capacity that occurs in the KJ20, KJ25, KJ30 column, the K25 column is respectively 17.4%; 34.0%; 34.7%. While the axial capacity increase in the KJs20, KJs25, KJs30 columns, for the K25 column is 54.9%; 62.5%; 71.5%. The reinforcement column with the addition of stirrup reinforcement, has a shorter value and greater axial capacity than the core column and reinforcement column without accompanying the addition of stirrups. The increase in axial capacity that occurs also increases along with the increase in the concrete compressive strength of the jacket which is used as reinforcement. Keywords: quality variation, axial capacity, concrete jacketing.

ANALISIS PERCEPATAN PELAKSANAAN PROYEK UNIT LAYANAN KANKER TERPADU RSUD BALI MANDARA DENGAN METODE FAST TRACK

Unit Layanan Kanker Terpadu RSUD Bali Mandara construction project has a building area of 4.272,74 m2. Projects with a contract value of Rp52.364.056.071 began work on May 6, 2019, and planned to finish on December 1, 2019. At the time of the study, the project progress report up to the 12th week showed a 3,76% delay in project implementation. This affects the project completion time and the contractor may be subject to penalty for the delay. This study’s purpose to design a schedule to get the acceleration of construction time using the fast track method and compare the results obtained by the conditions of project implementation experiencing delays. Secondary data used include time schedules, budget plans (RAB), weekly reports of supervisory consultants, analysis of contractor unit prices, and project drawings. The value of the implementation budget plan (RAP) is Rp45.917.529.226,76 calculated based on the RAB of the contractor without taxes and profits. The results of the analysis using the fast track method show that the project can be accelerated so that it can be finished according to the planned schedule by accelerating by 59 days (22,7%) from the duration of project implementation in a late condition (without acceleration). In terms of cost, project implementation in a late condition incurs more costs than the project implementation using the fast track method. The magnitude of the additional costs of implementing the project with a late condition of Rp2.656.202.803,55 or 5,468% more than the application of the fast track method. The application of the fast track method results in changes in the number of workers and material procurement needs at a time caused by the time shifts in activities implemented out in parallel.

ESTIMASI KONSEPTUAL BIAYA PEMBANGUNAN DRAINASE DI WILAYAH KOTA SUKABUMI MENGGUNAKAN MODEL

Drainase merupakan bagian penting dalam penataan system penyediaan air dibidang pertanian, tata ruang dan sebagainya, oleh karena itu pembangunan drainase merupakan bagian penting. Pembangunan saluran drainase memerlukan biaya, tetapi mengestimasi biaya membutuhkan data perencanaan secara detiail, perlu analisa biaya material, tenaga kerja, alat, dan membutuhkan waktu yang cukup lama. Pada tahap awal penetapan anggaran biaya sering belum tersedia data gambar, sehingga tidak ada dasar untuk menentukan jumlah anggaran. Oleh karena itu penelitian ini penting untuk menghasilkan model, sebagai rumus untuk memperediksi biaya tahap awal ketika data gambar belum ada. Model ini dihasilkan menggunakan metode analisis regresi. Data analisis yang digunakan adalah data rencana anggaran biaya terperinci pembangunan drainase berdasarkan populasi pembangunan drainase tahun 2018-2020 diwilayah kota Sukabumi. Memprediksi biaya pembangunan drainase menggunakan model hasil penelitian ini, cukup memasukkan volume pembangunan drainase, maka total biaya pembangunan dapat di ketahui dengan cepat. Model ini khusus untuk memprediksi biaya pembangunan drainase terbuka dengan spesifikasi pasangan batu yang di plester aci, sedangkan untuk memprediksi biaya pembangunan derainase tertutup seperti drainase gorong -gorong, u-dits, gravel dan lain-lain perlu penelitian lebih lanjut, karena spesifikasinya berbeda.