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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.
Analysis And Extraction Of Mineral Content From Guano In Karst And Non Caves sambolangi, Arise; Subaer; Susanto, Agus; Muhammad Arsyad
Advances In Social Humanities Research Vol. 2 No. 9 (2024): Advances In Social Humanities Research
Publisher : Sahabat Publikasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/adv.v2i9.290

Abstract

This study aims to carry out a comprehensive characterization of guano from cave and non-cave environments through a series of mineralogical and chemical analyses. The methodology used includes X-Ray Fluorescence (XRF) analysis to determine the composition of chemical elements, X-Ray Diffraction (XRD) for mineral phase identification, and Scanning Electron Microscopy (SEM) for morphological observations. The objectives of this study are: (1) to analyze the comparison of magnetic mineral properties, (2) to analyze the composition of chemical elements, (3) to analyze the types and phase distribution of magnetic minerals, and (4) to analyze the morphological differences between cave guano and non-cave. Cave guano samples are in the Bat Cave of the Rammang-Rammang Maros Karst Area and for non-cave guano samples are in Kalong Park, Soppeng Regency. The results showed that cave guano had a significantly higher magnetic susceptibility value than non-cave guanos, with variable values ranging from 278.0 x 10-8 m-3 kg to 832.7 x 10-8 m3/kg, while non-cave guano ranged from 23.7 x 10-8 m3/kg to 51.1 x 10^-8 m3/kg. The elemental composition of both types of guano is generally the same, but non-cave guano does not contain vanadium (V). XRD analysis revealed greater mineral phase diversity in cave guano compared to non-cave guanos. SEM confirmed significant morphological differences, with cave guano showing a denser and more uniform microstructure compared to a more heterogeneous structure in non-cave guanos. This research provides new insights into the influence of the environment on the composition and physical properties of guano, which can be helpful in agricultural applications and environmental research.
Co-Authors Ida Ayu Putu Sri Widnyani Muhammad Arsyad Muin, Nurfajriani Nurhayati Sambolangi, Arise