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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Ismeddyanto Ismeddyanto
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Engineering

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Sifat Mekanis Beton OPC Dan OPC POFA Menggunakan Air Gambut Sebagai Air Pencampur Andrian Prasetyo; Monita Olivia; Ismeddyanto Ismeddyanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Peat water containing a low pH is not recommended as concrete mixing water. Water has a pH below 7 is acidic water. The acidity of peat water can damage the quality and service life of concrete in the long term. The addicid of the added material such as oil ash or Palm Oil Fuel Ash (POFA) may increase the formation of calcium silicate hydrate as a gel adhesive concrete. This study aims to measure the mechanical properties such as compressive strength, tensile strength and modulus elasticity of concrete with a compressive strength of 35 MPa. Concrete compressive strength OPC and OPC + 10% POFA using peat water as mixing water has decreased by 8.33% and 6.33% of the compressive strength of normal concrete. The results of tensile strength and modulus of elasticity sides show strong results in line with the press. The use of oil ash or Palm Oil Fuel Ash (POFA) showed a decrease in mechanical properties is smaller than OPC concrete with peat water as mixing water. The compressive strength of concrete using peat water as mixing water has a value of compressive strength greater than 90% of the compressive strength of normal concrete, so the peat water is still fit for use as concrete mixing water with treatment (curing) of plain water.Keywords: OPC, mechanical properties, palm oil fuel ash, peat water.
Analisis Kekuatan Kolom Beton Bertulang Dengan Penampang Persegi Dan Silinder Akibat Beban Ledakan (Blasting Loads) Brian Priadana Mulrony; Reni Suryanita; Ismeddyanto Ismeddyanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bomb attack by terrorist in recent years had caused significant damage to structures, especially building structures. A bomb explosion within or nearby a building could cause huge damage toward structure even life loss. Due to the threat of bomb attack and it’s impact, it had become necessity to analyze the effect of blasting load on structures. One of solution that could be applied in order to decrease the impact was by strengthening the column element of a building. This research compared the column strength between cylinder column and square column. Each column had equal quality of concrete material and steel reinforcemenl. The purpose of this research was to conclude which type of column had better strength when subjected to blasting load. There were four portals variation used in this analysis, which each portal subjected to different parameter of blasting load. Parameter of blasting load used were 100 kg and 500 kg weight of TNT with 10 m and 15 m stand-off distance. The type of blasting load in this analysis was surface burst and its parameter calculated with ATBlast software. Beside variation of weight and stand-off distance, location of bomb planted also variated too, which were in front of and beside of building. Analysis result showed that among all of portal variation, the cylinder column had better strength than square column. It was proven by capacity design check and percentage of failed column. Based on analysis result, cylinder column type had smallest percentage of failed column with 6.06%, whereas the square column type had largest percentage of failed column with 59.60%.Keywords: Blasting loads, Reflection wave, Surface Burst, Interaction Diagram
Co-Authors Andrian Prasetyo Brian Priadana Mulrony Monita Olivia Reni Suryanita