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All Journal Jurnal Jejaring Matematika dan Sains BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan
Revianti Coenraad, Revianti
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Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Education Energy Engineering Mathematics Physics Other

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THE IMPROVEMENT OF QUALITY OF SOLID BLOCK CONCRETE ON COMMERCIAL INDUSTRY IN PALANGKA RAYA, CENTRAL KALIMANTAN PROVINCE Coenraad, Revianti
BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan Vol. 7 No. 1 (2019): Journal Balanga Edisi Januari-Juni 2019
Publisher : Jurusan Pendidikan Teknologi dan Kejuruan, FKIP, Universitas Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (736.361 KB) | DOI: 10.37304/balanga.v7i1.551

Abstract

The intention of Program Kemitraan Masyarakat Stimulus (PKMS), The Cooperated Program of Stimulus Community, is providing the training and empowerment on the process of concrete brick making to the cooperated group maker of solid concrete brick product at around Palangka Raya to enhance the product quality for the solid block (non-hole concrete brick) to be high quality with low price per unit, as well to improve the market demand of relating its product. The objective of this program is in order to be able improving the income of cooperated group maker of solid concrete brick product without disregarding the quality of produced concrete brick. The target of cooperation for this program, PKMS, is the home industry of concrete brick making owned by Mr. Ino and Mr. Alpi where are located at subdistrict of Panarung. The method used in this is the training, guidance, and further cross checking with some solutions in the production and marketing part. The training and guidance are implemented to achieve the high quality of solid block of concrete brick, followed by the knowledge of basic raw material, design of mixed model, maintenance, and testing of concrete brick quality. The main output will be the enhancement of solid block of concrete brick with high quality product. This activity will be published on the scientific and engineering publication such as journal and final report.
MODELING MATERIALS PRICE FOR BUILDING MATERIAL IN PALANGKA RAYA Patrisia, Yulin; Coenraad, Revianti
BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan Vol. 4 No. 2 (2016): Journal Balanga Edisi Juli-Desember 2016
Publisher : Jurusan Pendidikan Teknologi dan Kejuruan, FKIP, Universitas Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.378 KB)

Abstract

One of the components that play a vital role to the success of a construction project is construction prices, namely material prices, leasing and purchasing equipment prices, and construction wages. In the planning stage, the price used is the approximate price that will valid at the time of the project activities. At the implementing stage, the price used is the result of detailed estimates approaching real conditions at the time of the project activities. At the stage of monitoring and evaluation, the price will be reviewed to the conformity of the realization in the field, both the quantity and quality, further compared with employment contract. Research on the affecting factors of price construction materials is important. Furthermore, the affecting factors will be analyse to get a model approach for relevant price of construction materials. The construction material object in this research was timber. The study was conducted to obtain primary data and secondary data. Secondary data was performed to establish the factors that are predicted to affect the price of wood materials. Primary data were collected by distributing a questionnaire to 15 contractors in the city of Palangka Raya. Data obtained from the questionnaire and then analyzed by Severity Index (SI) for establishing the factors that affect the price of wood materal. Furthermore, the data were analyzed by the PLS model to obtain a model of approach to wood material prices. The study states there are several factors that affect the price of wood materials, namely economic factors, location factors, material resources factors, transport factors, and regulatory and government policies factors. Model approach to set the price of wood material by using PLS analysis showed that the material resources has an effect on the price of wood material, while the most dominant variable is the location factor.
MATHEMATIC MODELLING OF CONCRETE PUMP PRODUCTIVITY ON THE CONCRETE WORK OF CONSTRUCTION PROJECT IN PALANGKA RAYA Patrisia, Yulin; Coenraad, Revianti
BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan Vol. 2 No. 2 (2014): Journal Balanga Edisi Juli-Desember 2014
Publisher : Jurusan Pendidikan Teknologi dan Kejuruan, FKIP, Universitas Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (229.181 KB)

Abstract

The physical activities in Central Kalimantan Province especially Palangka Raya in the recent years indicates a good development and is cathed by the construction entrepreneur as one of good business opportunities, one of which is ready-mix-concrete company which produce fresh concrete. With this company, the concreting of high building can be done faster with stable concrete quality. In the field, the use of ready mix concrete for high building is equipped with a concrete pump. Concrete pump is an equipment to pump concrete to concreting location, mainly to a location difficult to reach by mixer truck. With concrete pump, concreting can be done faster. However, its productivity depends on the distance and the height of the location, beside the concrete quality itself. The research on concrete pump productivity on the concreting of construction project in Palangka Raya aims to make a mathematic model that is able to predict the relationship between concrete pump productivity and distance and height of the location of concreting. The result shows that there is a strong relationship between productivity with horizontal concreting, which is modelled by the formula (a) Y = 0.642 – 0.09 X1 + E, where Y = productivity (m3/min), X1 = distance (m), E = error; (b) Y = 0.628 - 0.09 X1 - 0.07 X2 + E, where Y = productivity (m3/min), X1 = distance (m), X2 = height (m), E = error
THE INFLUENCE OF MAGNITUDE AND NUMBER OF FLOOD CASES FOR UNIT HYDROGRAPH CALCULATION TO DESIGNED DISCHARGE ACCURATENESS Coenraad, Revianti
BALANGA: Jurnal Pendidikan Teknologi dan Kejuruan Vol. 3 No. 1 (2015): Journal Balanga Edisi Januari-Juni 2015
Publisher : Jurusan Pendidikan Teknologi dan Kejuruan, FKIP, Universitas Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (293.592 KB)

Abstract

Various methods can be used to predict design discharge, such as unit hydrograph theory. Problem to be coped with is the number of flood case required to derive the unit hydrograph for obtaining a unit hydrograph that represents a watershed and to obtain accurateness of certain design discharge. Subject of this study is based on four watersheds, two in the Province of Daerah Istimewa Yogyakarta: Code and Gajahwong watersheds, and two in the Province of Jawa Tengah: Upstream Progo and Bogowonto watersheds. Unit hydrograph representing a watershed is obtained by averaging the results of unit hydrograph analysis on several flood cases occurs in the studied watershed, in which this study uses the unit hydrograph. Accuracy analysis of unit hydrograph is carried out by comparing design discharge resulted from used unit hydrograph application and referred design discharge reference, which is the discharge of used unit hydrograph result on the most flood cases and analysis result of measured maximum discharge frequency. Results of this study show a tendency that larger number of flood cases used to derive the unit hydrograph implies smaller peak of the resulted unit hydrograph and more accurate designed discharge calculation. To obtain less than 10% relative error on the designed discharge for the outmost numbers of flood cases, it requires at least 10 flood cases with spesific discharge between 0.40 to 1.10 m3/s/km2. Designed discharge resulted from unit hydrograph indicates over estimated as well as under estimated tendency for various period to maximum discharge of the frequency analysis with relatively short length of data (<10 years).
Perancangan Filter Penjernih Air Sungai Kahayan Berbasis Pasir Silika Dan Lempung Alam Asal Kalimantan Tengah: Design of Kahayan River Water Treatment Filter Based Silica Sand and Natural Clay of Central Kalimantan Coenraad, Revianti; Wiratno; Karelius, Karelius
Jurnal Jejaring Matematika dan Sains Vol. 1 No. 2 (2019): Edisi Desember 2019
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jjms.v1i2.213

Abstract

Salah satu cara pengolahan air yang sederhana dan ramah lingkungan adalah melalui proses penyaringan dengan instalasi penyaringan air sederhana (IPAS) menggunakan bahan alam. Bahan alam yang dapat digunakan sebagai filter dalam instalasi penjernihan air sederhana adalah pasir silika dan lempung alam yang diaktivasi. Pengambilan sampel sungai akan dilakukan di DAS (Daerah Aliran Sungai) Kahayan Kalimantan Tengah. Sampling air akan dilakukan pada saat musim kemarau sehingga tidak ada pengaruh pengenceran. Filter pasir silika dan kerikil diperoleh dari toko penjual ikan hias yaitu pasir ukuran halus dan kasar. Filter lempung mangan dapat dibuat dengan menggunakan lempung alam yang perlakukan dengan MnCl2 dan KMnO4. Hasil pengujian menunjukkan filter lempung mangan dan arang aktif mampu menyaring zat-zat berbahaya yang terlarut dalam air, menghilangkan bau dan menjernihkan air sungai kahayan yang keruh. Air sungai kahayan yang sebelum dilakukan penjernihan memiliki nilai pH 5,5, kandungan Fe 2,16 mg/L, total padatan tersuspensi (TSS) 258 mg/L, total padatan terlarut 30 mg/L, kekeruhan 140 NTU dan sangat bau. Setelah dilakukan penjernihan dengan instalasi penjernihan air, penjernihan memiliki nilai pH 6,5, kandungan Fe 0,7 mg/L, total padatan tersuspensi (TSS) 134 mg/L, total padatan terlarut 32 mg/L, kekeruhan 35,3 NTU dan tidak berbau. Hasil penjernihan air ini cukup layak digunanakan sebagai air bersih karena nilai pH, kandungan Fe, TDS, TSS, kekeruhan dan bau sesuai dengan syarat air bersih menurut Permenkes RI No: 416/MENKES/PER/IX/1990.
Co-Authors Adi Wiratno, Adi Karelius, Karelius Patrisia, Yulin