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All Journal Reaktor Jurnal Teori dan Aplikasi Fisika
Simon Sembiring
Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Lampung
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology Physics

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Pengaruh Perlakuan Termal Terhadap Karakteristik Aspal Komposit Berbasis Silika Sekam Padi Nita Susanti; Juniati Br Simbolon; Simon Sembiring; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2452

Abstract

Synthesis and characterization of asphalt has been modified with silica rice husk with temperature variations of 200, 250, and 300oC. Silica is obtained from rice husk using the sol gel method. Furthermore asphalt and silica are solidified at 110oC. The experiment was conducted to determine the effect of temperature on the microstructure, structure, and functional groups of modified asphalt. SEM analysis shows asphalt modification with a temperature of 300oC in the form of different clumps. XRD analysis showed the phase formed from each temperature was an amorphous phase. The result of the FTIR analysis showed that the functional groups seen in the modified asphalt samples were Si-OH, Si-O-Si, Si-O, and C-H. The compressive strength carried out showed the strength of asphalt again cracks became stronger as the temperature increased.
Pengaruh Penambahan Abu Sekam Padi Terhadap Sifat Fisis dan Mekanis pada Mortar Ahmad Munawir Siregar; Roniyus Marjunus; Simon Sembiring
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2309

Abstract

The research was carried out about the effect of adding rice husk ash to physical and mechanical properties of mortar. Mortar was moulded with three composition comparisons between ordinary portland cement, rice husk ash, and rice stalk fiber. Rice husk ash was burned at temperature of 700 OC for 2 hours, rice stalk fiber was mechanically sliced up to 0.8 mm in size, then mortar molding and maintenance was processed for 28 days. The mortars that had reached the age of 28 days were tested according to the  Indonesia National Standard (SNI) including physical properties (water absorption, density), and mechanical properties (compressive strength, modulus of elasticity, modulus of rupture). Characterization of microstructure, morphology and counting all elements on the surface of  mortar were processed by using Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS). The results of research that had been carried out, mortar with the most optimum physical and mechanical properties was mortar B with a composition of 65%: 10%: 25%. The results of the characterization using SEM-EDS showed that the surface of mortar B was better with grain diameter (1.4 ± 0.9) µm and the most dominant element in the mortar was element of Ca and Si which functioned as mortar binder and hardener.
KARAKTERISTIK FISIS ALUMINOSILIKAT GEOPOLIMER BERBASIS SILIKA SEKAM PADI UNTUK APLIKASI FAST IONIC CONDUCTOR Agus Riyanto; Simon Sembiring; Junaidi Junaidi
Reaktor Volume 17 No. 2 Juni 2017
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (643.572 KB) | DOI: 10.14710/reaktor.17.2.96-103

Abstract

The study aims to investigate the effect of calcination temperatures on the phase formation and electrical properties of aluminosilicate geopolymer prepared from rice husk silica and sodium aluminate. The samples were calcined at temperature from 150 oC to 550 oC, the development of structures was characterized using x-ray difraction (XRD) and the electrical properties were measured by LCR meter. The result obtained indicated the significant role of calcining temperature on phase transformation of boehmite and quartz into aluminosilicate geopolymer, in which at calcining temperatures from 450 oC to 550 oC, and  the samples were dominated by semicrystal to amorphous phase which indicated that the aluminosilicate geoplymer has been formed. The presence of aluminosilicate geopolymer resulted in increased ionic electrical conductivity and dielectric loss factor as well as decrease dielectric constant. Ionic electrical conductivity of the calcined sample at 450 oC is 4,49.10-5 S/cm at frequancy of 5.106 Hz, and XRD analysis demostrated that the main structure is phase of semicrystal aluminosilicate geopolymer. Based on these character, the sample was considered is very suitable used to the fast ionic conductor materials.Studi ini bertujuan untuk menginvestigasi efek suhu kalsinasi pada formasi fasa dan sifat listrik aluminosilikat geopolimer yang dipreparasi dari silika sekam padi dan sodium aluminat. Sampel dikalsinasi pada suhu 150 oC – 550 oC, perubahan struktur dikarakterisasi menggunakan x-ray difraction (XRD) dan sifat listrik diukur menggunakan LCR meter. Hasil yang diperoleh mengindikasikan pengaruh yang signifikan suhu kalsinasi pada transformasi boehmite dan quartz menjadi aluminosilikat geopolimer, dimana pada suhu kalsinasi 450 oC – 550 oC didominasi oleh fasa semikristal hingga amorf yang mencirikan terbetuknya aluminosilikat geopolimer. Terbentuknya struktur aluminosilikat geopolimer diikuti dengan peningkatan konduktivitas listrik ionik, penurunan konstanta dielektrik, serta peningkatan faktor rugi dielektrik. Nilai konduktivitas listrik ionik sampel kalsinasi 450 oC ialah 4,49.10-5 S/cm pada frekuensi 5.106 Hz, dan analisis XRD menunjukkan struktur utamanya berupa fasa semikristal aluminosilikat geopolimer. Berdasarkan karakteristik tersebut, sampel yang ditinjau merupakan material dengan konduktivitas ionik yang tinggi sehingga sampel tersebut sangat potensial untuk dimanfaatkan sebagai fast ionic conductor.
Co-Authors Agus Riyanto Ahmad Munawir Siregar Junaidi Junaidi Juniati Br Simbolon Marjunus, Roniyus Nita Susanti Posman Manurung