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All Journal Construction and Material Journal Logic : Jurnal Rancang Bangun Dan Teknologi
Denny Yatmadi
Politeknik Negeri Jakarta
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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PERHITUNGAN DEBIT BANJIR SUNGAI CIPINANG DAN SUNGAI SUNTER PADA BERBAGAI PERIODE ULANG Ema Khoirunisa Ovilia; Eri Primadianti; Denny Yatmadi
Construction and Material Journal Vol. 2 No. 3 (2020): Construction and Material Journal Vol. 2 No. 3 November 2020
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v2i3.3556

Abstract

In the area around the Cipinang and Sunter Rivers, floods often occured due to runoff from overflowing rivers. The data and information used in this study are secondary data from related agencies, namely the Balai Besar Wilayah Sungai Ciliwung-Cisadane and BMKG. Hydrological and hydraulic analysis from existing data yield calculation results the maximum flood discharge for the Sunter River for a 2-year return period is 114.035 m³ / s and for a 100-year return period of 407.589 m3 / s and for the Cipinang River, the discharge for the 2-year return period is 113.214 m3 / s while for the 100 yearly repetition of 405,083 m3 / sec. Keywords : Cipinang River, Sunter River, Flood Flow.
INFLUENCE OF SALINITY LEVELS ANALYSIS ON SETTLING VELOCITY OF FINE SEDIMENT GRAINS IN CILIWUNG ESTUARY: Salinity Levels on Settling Velocity of Fine Sediment Grains Tri Wulan Sari; Denny Yatmadi; Rommy Martdianto; Sujito
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 22 No. 2 (2022): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5901.99 KB) | DOI: 10.31940/logic.v22i2.110-118

Abstract

Transport of estuarine sediment have a highly complex method, which is the combined effects result of periodically reciprocating flow, ocean waves, and the electrochemical characteristic of sea water [1]. Settling velocity (SV) is such a parameter fundamental for sediment researchers so that its accurate resolution has been regarded as a top priority in correcting modelling numerical and conceptual understanding of fine sediment dynamics [2] [3]. The goal of this study is to analyze the effect of salinity levels on the settling velocity of fine sediment grains in the Ciliwung estuary, Jakarta. The method used is direct measurement using the hydrometer analysis method. The result of experiment shows salinity levels affect the settling velocity of fine sediment grains in the Ciliwung estuary. The higher salinity, more faster the settling velocity of fine sediment grains. The average settling velocity at distilled water salinity 0 ppt is 1.083 mm/minute, sea water with salinity 0.3 ppt is 1.537 mm/minute, and sea water with salinity of 0.6 ppt of 1.561 mm/minute.
ANALISIS KUAT LENTUR DAN KUAT TEKAN PADA LIMBAH BOTOL PLASTIK BAHAN PEMBENTUK GRC Suripto; Tri Wulan Sari; Denny Yatmadi
Construction and Material Journal Vol. 5 No. 1 (2023): Construction and Material Journal Vol. 5 No. 1 Maret 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v5i1.5297

Abstract

Plastic is one of the items that cannot be separated from our daily lives. GRC (Glassfibre Reinforced Cement) is a building material similar to concrete, made of cement reinforced by fiberglass which has alkali resistant properties. The purpose of this study was to analyze the flexural strength and compressive strength of GRC building materials with plastic bottle substitution. The type of research used experimental. The method carried out by replacing several compositions of fiber, plastic processed from plastic bottle waste and fiber with plastic waste in the GRC-forming mixture to utilize plastic waste to reduce the use of fiber glass. The research method used starts from the study of literature, manufacture of test materials, manufacture of test specimens, testing of flexural strength and compressive strength, then data analysis and discussion are carried out. The results obtained were that the flexural strength of the GRC material specimen with a substitution of 3.5% fiber as measured by the weight of the mortar is the largest flexural strength compared to other material substitutions. With the average flexural strength value obtained is 1.81 MPa or Fs = 18.48 kg/cm2. From the substitution of 1.75% fiber plus 1.75% plastic bottle waste to the GRC-forming material, there was a decrease in the average flexural strength value of 1.44 MPa or about 10.10%, while the act of replacing plastic bottled waste to the GRC-forming material decreased. the average flexural strength value is 3.27 MPa or about 22.93%.
Co-Authors Ema Khoirunisa Ovilia Eri Primadianti Rommy Martdianto Sujito Suripto Tri Wulan Sari