Problems that occur in concrete buildings in the coastal environment of concrete damage caused by degradation of concrete that interacted seawater. Real damage caused by seawater, consists of 3 (three) parts: submerged concrete part, concrete part affected by tidal seawater and part of the concrete affected by seawater splashing. The concrete damage discussed in this research is the mechanical degradation of concrete due to the intrusion of seawater in the submerged seawater. Damage can occur in concrete due to the reaction between aggressive seawater that is intruded into the concrete and compounds in the concrete that causes the concrete lose some of its mass, its strength, and stiffness and also accelerate the weathering process. The results of this study indicate that the reduction of compressive strength of concrete due to the intrusion of seawater tends to show a logarithmic graph. Concrete compressive strength will lose by 50% when the concrete is soaked seawater for 19,031 days. Normal quality concrete f’c = 25 MPa undergoes mechanical degradation due to seawater intrusion, in this case, the compressive strength of concrete is 12,063 % when soaked 28 days and 16,809 % when soaked 90 days.
The role of irrigation is very important to increase agricultural production. Utilization of water through a good treatment system for water utilization is implemented effectively and efficiently. Sediment transport in irrigation can shorten the service life of irrigation networks, due to silting and decreasing capacity, making it difficult for water to reach the surface of the rice fields and irrigate rice fields. Various efforts have been made to reduce sediment transport in irrigation canals, one of which is commonly done is the manufacture of Sediment Retention Models (SRM). Nevertheless, the sediments continue to enter the irrigation canal in considerable amounts. So in operation and maintenance it requires a high enough cost for such sediment dredging Given the importance of a sediment-catcher building, special attention needs to be paid to this problem, among others, by creating a sediment-resistant model that has the ability to capture sediment well. In the hope of helping to precipitate sediment so as not to disrupt the function of the channel. The research will be conducted at the Civil Engineering Laboratory of Muhammadiyan University of Makassar. The purpose of the research is to know the nature of the flow that occurs in the sediment catcher building, to know the volume of basic sediment transport with the calculation directly and compare with the formula approach. The results showed that the larger volume of sediment flow velocity tended to narrow, from 0.
Penelitian ini merupakan penelitian uji eksperimental tentang kecepatan aliran disekitar tirai sayap beton sebagai pereduksi gerusan pada pilar jembatan. Tujuan dari penelitian ini adalah menganalisis kecepatan aliran disekitar pilar jembatan sebelum dan sesudah ada tirai sayap beton dengan menggunakan iRIC:Nays2HD 3.0. Penelitian ini menggunakan model saluran tanah dengan penampang bentuk trapezium, model pilar silinder dan model tirai sayap beton. Pengamatan yang dilakukan adalah debit aliran (Q), kecepatan aliran (v), kedalaman aliran (h) dan elevasi kedalaman gerusan (ds) untuk setiap selang waktu tertentu. Hasil simulasi dari penelitian ini menunjukkan kecepatan aliran yang terendah yaitu 0,000 m/s dan tertinggi yaitu 0,998 m/s. Kecepatan aliran yang terjadi di sekitar pilar jembatan dan tirai sayap beton relatif kecil disebabkan karena arah aliran yang berubah setelah adanya tirai sayap beton. Gerusan yang terjadi disekitar pilar jembatan relatif kecil disebabkan karena adanya tirai sayap beton di depan pilar. Berdasarkan hasil validasi antara analisa model iRIC:Nays2DH 3.0 dengan model fisik pada output velocity (ms-1) mempunyai perbedaan yang relatif kecil yaitu sebesar 4.61%.
Runtuhnya jembatan Moncongloe sebagian besar disebabkan karena terjadinya debit banjir yang sangat besar pasca banjir tahun 2018, sehingga menyebabkan gerusan disekitar pilar jembatan. Tujuan dari penelitian ini adalah untuk menganalisis pengaruh debit aliran terhadap kedalaman gerusan lokal pada pilar jembatan Moncongloe dan pengaruh kedalaman gerusan lokal terhadap pilar jembatan. Penelitian ini dilaksanakan di Jembatan Moncongloe pada aliran sungai Je’nelata dan secara administrasi terletak di Kecamatan Parangloe dan Desa Tamalate Kecamatan Manuju Kab. Gowa Provinsi Sulawesi Selatan. Secara geografis terletak di 119 34 52 BT dan 5’15’52’’ LS sebelah utara dari Kota Makassar berjarak 20 km. Hasil penelitian ini menunjukkan dari beberapa metode yang digunakan untuk analisis gerusan, metode Lacey lebih mendekati dengan kondisi lapangan.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.