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All Journal Jurnal Teknik Sipil ARMATUR : Artikel Teknik Mesin dan Manufaktur
Zuraida Zuraida
Politeknik Negeri Banjarmasin
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Perancangan Lapis Pondasi Agregat Tanpa Penutup Aspal Pada Gradasi Batas Tengah Dengan Menggunakan Clay Stone Ahmad Norhadi; H. Muhammad Fauzi; Akhmad Marzuki; Zuraida Zuraida
Jurnal Teknik Sipil Vol 2 No 2 (2018): Jurnal Gradasi Teknik Sipil - Desember 2018
Publisher : P3M Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31961/gradasi.v2i2.609

Abstract

“Lapis Pondasi Agregat tanpa penutup aspal” is a strong layer structure because it receives a direct load of vehicles above the surface. In general, the making of access roads for mining sites does not use pavement with asphalt. One of the materials for mining pavement generally uses the mine's surface excavation using a clay stone as an addition to a mixture or filler for the aggregate layer structure. Clay stone is a sedimentary rock that is strong if it is in the soil and will become soft when submerged in water. “Lapis Pondasi Agregat tanpa penutup aspal” is dominated by fine particles which is a maximum diameter of 19 mm making it difficult to adjust the gradation composition. So to get the ideal gradation of “Lapis Pondasi Agregat tanpa penutup aspal” composition, it is necessary to do Research on “Lapis Pondasi Agregat tanpa penutup aspal” on Middle Border Gradations Using Clay Stone". The purpose of this study was to determine the value of the mixture composition between clay stone and broken stone, the value of PI content (plastic index) and CBR value “Lapis Pondasi Agregat tanpa penutup aspal” must meet the requirements of material properties in accordance with the General Revised 3rd Edition of Bina Marga specifications, the gradation consists of material passed the filter ¾, maximum liquid limit value of 35%, minimum plasticity index value of 4% and maximum 15 %, clumps of clay and fragile granules of at least 0% and a maximum of 5%, coarse aggregate abrasion is a maximum of 40% and has a minimum CBR (California Bearing Ratio) value of 60%. From the results of this study, it can be seen the mixture composition between clay stone and stone, PI value (plastic index) and CBR value from the gradation of the middle boundary of the “Lapis Pondasi Agregat tanpa penutup aspal”. The composition of the mixture of clay stone and aggregate rock broke on the middle boundary gradation, ie 1-2% broken stone by 20%, 1-1 broken stone by 33%, stone ash by 35%, and clay stone by 12%. Based on the results of the examination of the liquid limit and plastic limit, the Plastic Index (PI) value of the clay stone was 35.696% and for the combination of the mixture of broken stone with an additional 12% clay stone was 13.941%. Based on the results of laboratory density and CBR examinations, it was found that the design CBR value of broken stone aggregate was 73%, the clay stone was 1,150% and for the combination of clay stone and aggregate rock was broken by 64%.
Sistem pengelolaan laboratorium pengujian bahan untuk mewujudkan pelaksanaan praktikum yang efisien Zuraida Zuraida; Robby Cahyadi
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol 2 No 1 (2021): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (122.555 KB) | DOI: 10.24127/armatur.v2i1.603

Abstract

Permasalahan yang dihadapi Laboratorium Pengujian Bahan di Politeknik Negeri Banjarmasin adalah: sumber daya manuasia (SDM) kurang kompeten, kepala laboratorium bukan sebagai pekerjaan utama, laboratorium belum dikelola dengan baik, serta laboratorium belum dapat dimanfaatkan secara optimal. Untuk mengatasi masalah tersebut maka dilakukan bimbingan teknis tenaga laboratorium, dan workshop manajemen laboratorium. Tahapan yang dilakukan meliputi: pembinaan teknis SDM, workshop pengelolaan laboratorium, inventarisasi dan pelabelan, workshop penyusunan jadwal, standard operating procedure (SOP), dan implementasinya. Hasil yang diperoleh adalah Laboratorium Pengujian Bahan di Politeknik Negeri Banjarmasin secara umum telah memenuhi standar sarana dan prasarana, SDM yang kurang, manajemen yang baik dapat membantu praktikum berjalan secara efisien sesuai jadwal.
Kaji eksperimen pengaruh hardening dan tempering terhadap kekuatan tarik dan kekerasan pada baja karbon sedang Akmal Barry; Zuraida Zuraida
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol 3 No 1 (2022): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v3i1.1905

Abstract

This study aims to determine the effect of hardening and tempering on tensile strength (ASTM E 8) and hardness (Rockwell) applied to medium carbon steel. The heat treatment process hardening is heated by a furnace at a temperature of 900 °C and 920 °C then held for 30 minutes and cooled quickly and then further processed by Tempering with each being tempered at 500 °C and cooled slowly. The results obtained are in the hardening process with a temperature variation of 900 °C, the hardness value increases from the raw material value of 5.7 HRC to 7.52 HRC and has increased again at a temperature of 920 °C of 8.08 HRC. Tempering process temperature variation of 900/ 500 °C the value is above raw material by 5.7 HRC to 7.24 HRC, down at a temperature of 920/500 °C by 6.4 HRC. For tensile testing of the hardening process against utimate stress, the value for raw material is 516,095 MPa, temperature is 900 °C/451,065 MPa and temperature is 920 °C/389,625 MPa. for yield strength raw material value is 477.4165 MPa, temperature is 900°C/270.8395 MPa, temperature is 920°C/256.4555 MPa, for modulus raw material value is 347.53 GPa, temperature is 900°C/3452605 MPa , the temperature is 920 °C/338.206 MPa, for the elongation value the raw material value is 7.871%, the temperature is 900 °C/11.392%, the temperature is 920 °C/16.448 %. for tempering to utimate stress the raw material value is 516,095 MPa, temperature 900/500 °C is 417,5635 MPa and temperature 920/500 °C is 372.416 MPa. For yield strength raw material value is 477.4165 MPa, temperature 900/500°C 304.1745 MPa, temperature 920/500 °C is 269.818 MPa, for modulus raw material value is 347.53 GPa, temperature 900 /500°C is 353.1525 MPa, temperature 920/500 °C is 366.5695 MPa, for the elongation value the raw material value is 7.871%, temperature 900/500 °C is 11.392%, temperature 920/500 ° C is 13.7665%.
Co-Authors Ahmad Norhadi Akhmad Marzuki Akmal Barry H. Muhammad Fauzi Robby Cahyadi