Road traffic safety in developing countries is a complex problem involving many factors such as humans, vehicles, structures, and the roads' environments. This study focuses on reducing traffic accidents for passenger busses, aiming to identify the causes and create a simple computer model to warn in areas like EWS using geometric road data. The survey was conducted at accident-prone locations and simulated the travel speed, road geometric, and traffic composition data. Results can be concluded that the rate is largely influenced by the radius of curvature, visibility, road gradient, and weather conditions. The concept of the EWS computer model was developed using web-based technology that can use to record the data instantly. The model had tested in another location to validate the field parameter and geometric road improvement.
<p class="JUDUL">Abstrak: Pemeriksaan hasil pemadatan timbunan tanah dilakukan sebagai bagian dari pelaksanaan manajemen kualitas di lokasi proyek. Pengujian timbunan tanah dilakukan dengan metode konus pasir dimaksudkan untuk mengetahui kepadatan relatif tanah apabila dibandingkan dengan hasil pengujian kepadatan tanah di laboratorium dengan metode Proctor. Dari 3 (tiga) titik pengujian, hasil uji berat isi kering di lapangan (<em>g</em><em><sub>dry(lap)</sub></em>) memberikan nilai sebesar 1,16 – 1,36 g/cm<sup>3</sup>, jauh lebih kecil daripada hasil pengujian kepadatan tanah laboratorium (<em>g</em><em><sub>dry(max)</sub></em>) dengan nilai sebesar 1,44 – 1,52 g/cm<sup>3</sup>. Dengan kepadatan relatif (<em>D<sub>R</sub></em>) sebesar 78,7% - 94,2%, hasil pemadatan di lapangan dinyatakan tidak diterima. Setelah dilakukan proses pemadatan ulang di lokasi pekerjaan, nilai berat isi kering di lapangan (<em>g</em><em><sub>dry(lap)</sub></em>) berubah menjadi 1,16 – 1,17 g/cm<sup>3</sup>, dan hasil pengujian kepadatan tanah laboratorium (<em>g</em><em><sub>dry(max)</sub></em>) menghasilkan nilai sebesar 1,22 – 1,23 g/cm<sup>3</sup>, sehingga besar kepadatan relatif tanah (<em>D<sub>R</sub></em>) adalah sebesar 94,3% - 95,9%. Berdasarkan hasil tersebut, pelaksanaan pemadatan tanah di lapangan dapat diterima.<br /><br />Abstract: Inspection of the results of compaction of soil embankment is carried out as part of the implementation of quality management at the project site. Soil density test on site is carried out using the sand cone method to determine the relative density of the soil when compared with the soil density test results in the laboratory using the standard Proctor method. From the 3 (three) test points, field dry density results (<em>g</em><em><sub>dry(lap)</sub></em>) give a value of 1.16 - 1.36 g / cm3, much smaller than the laboratory soil density test results ((<em>g</em><em><sub>dry(max)</sub></em>)) with a value of 1.44 - 1.52 g / cm3. With a relative density (DR) of 78.7% - 94.2%, the results of compaction in the field were not accepted. After the compaction process is carried out, the soil dry density (<em>g</em><em><sub>dry(lap)</sub></em>) changes to 1.16 - 1.17 g / cm3, and with the laboratory soil density test results (<em>g</em><em><sub>dry(max)</sub></em>) value of 1 .22 - 1.23 g/cm3, so that the relative soil density (DR) was 94.3% - 95.9%. Based on these results, the implementation of soil compaction in the field is acceptable.</p><p><strong><em>Keywords</em></strong><em>: project quality management, dry density of soil, </em><em>relative dry density, sand cone test, standard Proctor compaction test</em><em></em></p>
<p><em>Fly ash dan bottom ash merupakan limbah B3 yang dihasilkan dari proses pembakaran batu bara.</em><em> </em><em>Di Indonesia, batu bara banyak digunakan sebagai bahan bakar pada pembangkit listrik tenaga uap (PLTU). Salah satu PLTU di Indonesia yaitu PLTU Sulawesi Utara II, yang terletak di Provinsi Sulawesi Utara, Kabupaten Minahasa Selatan. Jumlah limbah yang dihasilkan cukup banyak sehingga dibutuhkan cara untuk mengurangi penumpukan fly ash dan bottom ash. Fly ash dan bottom ash dapat digunakan sebagai material stabilisasi tanah dasar. Dalam penelitian ini, diambil dua sampel tanah yang berbeda dengan komposisi penambahan fly ash dan bottom ash yang bermacam-macam. Pengujian CBR dilakukan pada tanah dengan komposisi yang paling optimum menurut klasifikasi AASHTO, yaitu tanah yang termasuk ke dalam kelas A-1 dan A-2 dengan kondisi kuat dukung tanah sangat baik hingga baik. Hasil pengujian CBR pada tanah yang telah dicampur dengan fly ash dan bottom ash adalah sebesar 19,66%, 52,22%, 21,33%, dan 40,88%. Dari hasil pengujian tersebut dapat disimpulkan bahwa penambahan fly ash dan bottom ash pada tanah dapat meningkatkan nilai CBR pada tanah asli yang semula hanya memiliki nilai sebesar 11,2% dan 5,35%.</em><em></em></p>
3) ABSTRAKSebagai upaya peningkatan kualitas hidup dan lingkungan di kawasan permukiman Kota Palembang, dilakukan upaya berupa pengembangan sistem sanitasi melalui program pembangunan Instalasi Pengolahan Air Limbah (IPAL) Komunal, yang berlokasi di Perumahan Griya Prima Sriwijaya dan Perumahan Deyhan Abadi, Kota Palembang. Penelitian dilakukan dengan tujuan untuk merencanakan perangkat IPAL komunal yang efisien dan handal, serta mudah dalam pengoperasian dan perawatannya. Tahapan perencanaan yang dilakukan meliputi pengukuran topografi area perumahan dan penampang melintang sungai, kajian proyeksi timbulan air limbah dan kapasitas IPAL komunal dengan teknologi Anaerobic Baffled Reactor (ABR), termasuk di dalamnya desain sistem perpipaan, desain bak penampungan limbah, desain bak pengendapan awal, desain bak anaerob, desain bak aerob, desain bak pengendapan akhir dan desain bak resapan. Mengingat bahwa kedua perumahan memiliki karakter dan volume timbulan limbah yang tidak berbeda, maka dimensi IPAL komunal yang direncanakan adalah sama besar, dengan kapasitas 200 m 3 /hari. Berdasarkan perhitungan yang telah dilakukan, dimensi bak penampungan limbah, bak pengendapan awal, bak anaerob, bak aerob, dan bak pengendapan akhir berturutturut adalah sebesar 40 m 3 , 70 m 3 , 45 m 3 , 25 m 3 , dan 40 m 3 . Kata kunci: Instalasi Pengolahan Air Limbah (IPAL) Komunal, Anaerobic Baffled Reactor (ABR), sistem sanitasi perkotaan.
<p>Evaluation modelling of the OT-22 steel sheet pile wall with type H-350 steel strutting reinforcement in the excavation for the foundation structure with a depth of 7.50 meters was carried out to get the value of the safety factor and wall stability. The evaluation stages include subgrade investigation using the SPT method, data collection of profile steel properties used, interpretation of soil data, staged-construction modeling using the Finite Element Method (FEM) computer application, and analysis of modeling results. From the research that has been done, the value of maximum bending moment (M<sub>max</sub>) is 223.8 kNm/m', the magnitude of the axial force that occurs in the strut members is 22.51 kN, 121.91 kN, and 66.10 kN respectively. The value of maximum lateral displacement (U<sub>x</sub>) is 62.4 mm. From these results, it can be concluded that the lateral displacement (U<sub>x</sub>) that occurs is much larger than allowable displacement (U<sub>all</sub>) 39 mm. Thus, it is necessary to modify the existing sheet pile wall system, such as to change the dimensions of the steel sheet pile, changing the dimensions of the steel strutting, or changing the distance of the steel strutting.</p>
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