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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Pengaruh Penambahan Semen Portland Terhadap Sifat Mekanik Geopolimer Berbasis Fly Ash Muin, Nurfajriani; Subaer; Nurhayati
JFT : Jurnal Fisika dan Terapannya Vol 10 No 2 (2023): DESEMBER
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v10i2.40262

Abstract

This study is a pure experimental research aimed at investigating the influence of adding portland cement on the mechanical properties of fly ash-based geopolymers. The composites were synthesized using fly ash as the base material, along with portland cement and alkali activation. Four compositions of samples were prepared with varying additions of portland cement at 0%, 20%, 40%, and 60%. The samples were then cured at 70°C for 2 hours and subsequently stored in an open space for 28 days. The crystal structure of the samples was analyzed using X-Ray Diffraction (XRD). Fourier Transform Infrared (FTIR) was used to examine the functional groups in the samples. Density and porosity testing were conducted using Archimedes' principle. Meanwhile, the mechanical properties of the samples were tested for compressive and flexural strength. The results of the XRD analysis showed the presence of quartz (SiO2) crystal peaks, along with other phases formed, including Calcium Oxide, Calcium Aluminum Silicate, Sodium Aluminum Silicate, Iron Oxide, Calcium Peroxide, and Aluminum Iron Oxide. The FTIR analysis of the composite functional groups indicated that there were no significant shifts in the absorption bands' wave numbers (cm-1) for each composition variation. The test results for density, porosity, and mechanical properties of the samples demonstrated a decrease with increasing additions of portland cement. The most optimal formulation was the geopolymers without the addition of portland cement (G-PCC 0%), which exhibited the highest compressive strength and relatively higher flexural strength.
Development of an Automatic Portable Calibrator for Tipping Bucket Rain Gauge (TBRG) Using a Load Cell and Simple Water Sensor Rohmah, Dani Zulfia; Jasruddin; Subaer; Utomo, Bagus Satrio
Jurnal Penelitian Pendidikan IPA Vol 10 No 9 (2024): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i9.7634

Abstract

The tipping bucket rain gauge is an automatic rain gauge that can measure rain intensity in mm/hour. Accurate measurement of rain intensity requires calibration of the rain gauge to ensure traceability. Calibration of a tipping bucket rain gauge is related to the volume of water as a calibration medium and time so as to produce a discharge that can be converted into rain intensity. Technological developments can make tipping bucket rain gauge calibration automatic by utilizing an Arduino Mega2560 microcontroller, a load cell and a simple water sensor based on the LM393 comparator IC, and combined with a compact design printed using a three-dimensional printer so that it can be used for ex-situ calibration. The data produced by this tool can be downloaded via the application that was built and produces a file in Excel form.
Desain Bahan Ajar pada Pembelajaran Outdoor Class untuk Meningkatkan Keterampilan Berpikir Kritis Peserta Didik Azinah A, Sitti Zakiyah; Subaer; Arsyad, Muhammad
Jurnal Penelitian Pendidikan IPA Vol 10 No 12 (2024): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i12.9136

Abstract

This type of research is Research and Development (R&D). This study aims to design teaching materials for outdoor class learning. The results of the study showed that expert research on teaching materials for outdoor class learning that had been developed was then analyzed using the Aiken'V formulation, obtaining an average aspect of content feasibility of 0.82, presentation feasibility of 0.84 and language aspect of 0.78 and declared to meet the feasibility criteria (valid). The results of the teacher's assessment of the teaching materials obtained aspects of the feasibility of instructions with an average of 3.67, aspects of the coverage of questionnaire components of 3.67 and aspects of language feasibility of 3.33 with a very practical category. So, it can be concluded that the teaching materials in this outdoor class learning are declared worthy of being tested. The effectiveness of teaching materials in outdoor class learning can be seen from the increase in critical thinking skills of students based on the results of the pretest and posttest which were analyzed using the N-Gain test. Overall, the average value of students' N-Gain in critical thinking skills is 0.61 in the moderate category. So, it can be concluded that there is an increase in critical thinking skills of class XI students of SMAN 3 Enrekang. This shows that teaching materials in outdoor class learning are effective for use in the learning process.
Co-Authors Azinah A, Sitti Zakiyah Jasruddin Muhammad Arsyad Muin, Nurfajriani Nurhayati Rohmah, Dani Zulfia Utomo, Bagus Satrio