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All Journal JPSE (Journal of Physical Science and Engineering) Metal Indonesia Jurnal TAMBORA JURNAL TEKNIK Specta Journal of Technology Bima Abdi: Jurnal Pengabdian Masyarakat Jurnal Pijar MIPA JURNAL TEKNIK INDUSTRI Hexagon AMMA : Jurnal Pengabdian Masyarakat

Fauzi Widyawati

Metallurgical Engineering Study Program, Faculty Of Environmental And Mineral Technology, Sumbawa University Of Technology

Author-ID : 5551150

Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Physics Other

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ANALISIS PENGARUH MASSA SERAT TERHADAP SIFAT FISIS DAN MEKANIK PAPAN KOMPOSIT GIPSUM BERPENGUAT SISAL (AGAVE SISALANA) Muhammad Hisyam; Fauzi Widyawati
Hexagon Jurnal Teknik dan Sains Vol 2 No 1 (2021): HEXAGON - Edisi 3
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Komposit berpenguat serat alam banyak diteliti dan dikembangkan karena sifatnya yang lebih ramah lingkungan sehingga dapat dengan mudah terdegradasi secara alami. Gipsum adalah salah satu produk material komposit yang digunakan sebagai bahan bangunan dan biasa dipakai sebagai partisi bangunan, plafon, sekat, dan asesoris ruangan. Akan tetapi gipsum juga memiliki kelemahan pada sisi keuletan dan tidak tahan air. Inovasi yang banyak dikembangkan saat ini adalah memodifikasi menggunakan jenis serat yang memiliki kekuatan dan kekakuan yang baik, bobot ringan serta biaya produksi yang murah agar dapat mengatasi kekurangan sifat fisik gipsum.Telah dilakukan penelitian mengenai pembuatan dan karakterisasi papan semen-gypsum dengan menggunakan serat sisal (Agave Sisalana) dan campuran semen PPC. Papan gipsum dibuat dengan memvariasikan persentase massa serat sisal. Variasi persentase massa serat yang digunakan dalam penelitian ini yaitu 0%, 2%, 4%, 6%, 8%. Dalam penelitian ini, gipsum komersial digunakan sebagai pembanding. Variasi persentase massa serat paling optimum untuk pembuatan papan gipsum yaitu pada persentase serat 0%. Untuk karakterisasi sifat fisis diperoleh densitas 1.185 g/cm3 dan daya serap air 42,53%. Hasil pengujian densitas pada semua variasi sampel telah memenuhi standar acuan yaitu SNI 01-4449-2006 dan nilai daya serap yang diperoleh pada semua variasi sampel telah memenuhi standar acuan yaitu JIS A-5908-2003.

PENGARUH VOLUME SERBUK TERHADAP LAJU PENYERAPAN AIR PADA KOMPOSIT PARTIKEL TONGKOL JAGUNG (CORN COB) DENGAN MATRIKS EPOKSI Maulana Malik Ibrahim; Rita Desiasni; Fauzi Widyawati
Hexagon Jurnal Teknik dan Sains Vol 2 No 1 (2021): HEXAGON - Edisi 3
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Serbuk tongkol jagung adalah limbah alam yang digunakan sebagai penguat pada komposit papan partikel. Limbah tongkol jagung sangat berlimpah di Kabupaten Sumbawa Besar, NTB. Pada umumnya tongkol jagung mengandung bahan selulosa murni yang dapat menjadi bahan pengisi alternatif karena sifat seratnya yang kuat (modulus tinggi). Antara rantai-rantai selulosa terdapat ikatan hidrogen yang kuat, sehingga menghasilkan struktur kristalin. Untuk menentukan sifat fisik terhadap limbah tongkol jagung dalam pemanfaatannya. Oleh karena itu limbah tongkol jagung dijadikan sebagai media komposit papan partikel. Serbuk tongkol jagung menggunakan ukuran partikel 70 Mesh dengan variasi volume 30%, 40%, 50%, 60%, 70%. Pembuatan komposit dilakukan dengan metode hand lay up dengan campuran resin epoxy dan hardener menggunakan standar pengujian SNI 03-2105-2006. Hasil yang diperoleh dari uji daya serap air menunjukkan bahwa semakin meningkat variasi volume yang digunakan pada komposit maka semakin tinggi daya serap air pada papan partikel dan semakin lama waktu perendaman yang digunakan makan semakin tinggi persentase yang didapatkan. Sedangkan hasil dari persentase berat terendah yaitu pada variasi volume partikel 30% dengan lama waktu 24 jam sebesar 1.4% dan persentase tertinggi yaitu pada variasi volume partikel 70% dengan lama waktu perendaman yaitu 72 jam sebesar 14.2%. Dari hasil penelitian yang dilakukan menunjukkan bahwa komposit serbuk tongkol jagung dengan resin epoxy pada variasi volume 30% yang lebih baik dibandingkan dengan variasi volume 70%.

SINTESIS MANGANESE FERRITE DENGAN METODE MECHANICAL ALLOYING DARI BIJIH MANGAN ALAM syamsul bahtiar; Imam Wierawansyah Eltara; Fauzi Widyawati; Syamsul Hidayat
Hexagon Jurnal Teknik dan Sains Vol 3 No 1 (2022): HEXAGON - Edisi 5
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

One of the largest natural resources of manganese ore in Indonesia is located in the Regency of Sumbawa Besar and has high manganese content. Manganese ore can be used to form manganese ferrite compounds. The synthesis of manganese ferrite (MnFe2O3) consists of an alloy of manganese ore (MnO2) and hematite (Fe2O3) obtained from mill scale steel production waste. The two particles are then combined by the mechanical alloying method. Manganese ore is first calcined at temperature variations of 400oC, 500oC, and 600oC. The mechanical alloying process of manganese and hematite ore by varying the amount of manganese ore 1: 1, 1: 2, 1: 3, 1: 4. Furthermore, the mixture of particles was calcined at a temperature of 1100oC for 3 hours to obtain homogeneous manganese ferrite. Initial XRD characterization obtained manganese ore in the form of pyrochroite (Mn(OH)2) and after calcination at a temperature of 500oC pyrolusite (MnO2) was formed. The final results of XRD and XRF characterization showed that the addition of MnO2 to Fe2O3 produced manganese ferrite bixbite (MnFe2O3) with a formation intensity of 70%. Dominant MnFeO3 phase at a 4: 1 ratio. The more MnO2 added to Fe2O3, the more manganese ferrite bixbite phases are formed.

Indonesia PENGARUH UKURAN PARTIKELTERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT LIMBAH GERGAJI KAYU JATI DENGAN MATRIK RESIN EPOXY: PENGARUH UKURAN PARTIKELTERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT LIMBAH GERGAJI KAYU JATI DENGAN MATRIK RESIN EPOXY rita desiasni; Fauzi Widyawati; Riza Monica
Hexagon Jurnal Teknik dan Sains Vol 3 No 1 (2022): HEXAGON - Edisi 5
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

The physical and mechanical properties of particle composite materials are influenced by particle size. Variations in particle size will form different physical and mechanical properties. The size variations used are 100 mesh, 150 mesh, 200 mesh. The comparison between matrix and particles is 70% : 30% using the hand lay-up method. The test consists of physical tests, namely density and thickness expansion as well as mechanical tests consisting of Modulus Of Rapture (MOR) and Modulus Of Elasticity (MOE). The results of the physical density test were at a value of 0.93-1.02 g/cm3, the best density was at a particle size of 100 mesh with a value of 1.02 g/cm3. While the thickness test obtained values ??ranging from 9.3-9.8%, with the highest thickness development of 9.8% at a particle size of 100 mesh. While the results of the mechanical test itself, all variations in mesh size meet the standard, namely the highest MOR test is obtained in the 100 mesh variation, with a value of 341.15 kgf/cm2, while in the MOE test none of which meets the standards of SNI 03-2105-2006, the highest mesh variation is obtained by mesh. obtained at mesh 100 that is 8072.49 kgf/cm2.

ANALISIS PENGARUH PENAMBAHAN SISAL TERHADAP SIFAT FISIK DAN MEKANIK PADA BATA RINGAN AAC (AUTOCLAVED AERATED CONCRETE) fauzi widyawati
Hexagon Vol 4 No 2 (2023): HEXAGON - Edisi 8
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v4i2.2965

AAC lightweight brick (Autoclaved Aeration Concrete) is a type of brick that has a lighter density compared to other types of brick in general. This type of brick is widely applied as walls in buildings. The manufacture of lightweight bricks is much modified from the materials used. As is the case with the addition of sisal fiber (Agrave sisalana) which is added to the lightweight brick mixture. Sisal fiber was added to increase the strength value of lightweight bricks. The purpose of this study was to determine the effect of adding sisal fiber to AAC-type light bricks with the variations used, namely 0%, 2%, 4%, and 6% on the physical and mechanical properties of light bricks. The addition of sisal fiber to lightweight bricks resulted in a decrease in the physical properties of AAC lightweight bricks by volume weight (BV), but the sample values of 0%, 2%, 4%, and 6% still met the standard by volume weight of lightweight bricks according to SNI 03-0349 -1989 which is 0.600-1.600 g/cm³. For the water absorption (Absorption) test the results obtained increased, this was due to the factor of the variation in the addition of fiber which was high enough so that the absorption value of water increased and the pores in the light bricks were not completely filled. For mechanical testing, namely compressive strength, the results obtained decreased, this was due to the fact that the sisal fiber experienced the phenomenon of material segregation.

PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI TERHADAP KEKUATAN FISIK, MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL Desiasni, Rita; Widyawati, Fauzi; Nabila, Maitsa Fikri; Saiful, Muhammad
Hexagon Jurnal Teknik dan Sains Vol 5 No 2 (2024): HEXAGON - Edisi 10
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i2.4143

The strength of the mechanical and physical properties of particle composite materials is influenced by the volume fraction of the powder and matrix. The pretreatment was carried out by soaking 2% NaOH for 1 hour. The results of the MOE treatment mechanical highest test value at the powder volume fraction of 30:70%, which was 6145.51 kgf/cm² and the highest MOR test value at the 30:70% volume fraction, which was 167.38 kgf/cm². Meanwhile, the highest non-treatment MOE value at the 30:70% powder volume fraction was 5540.9 kgf/cm² and the highest MOR test value at the 30:70% volume fraction was 156.6 kgf/cm². The results of the physical properties test were the highest density at the 30:70% powder volume fraction of 0.87 gr/cm³ and the highest density at the 30:70% non-treatment powder volume fraction of 0.78 gr/cm³. The results of the MOE mechanical test do not meet the JIS A 5908-2003 standard while the MOR mechanical test and physical test have met the JIS A 5908- 2003 standard. The results of microstructure testing showed that at a fraction of powder volume of 30:70% it was seen that the particles were coarser which blended perfectly with the matrix.

PENGARUH FRAKSI VOLUME SERAT SISAL DAN FILLER SERBUK KAYU JATI TERHADAP KEKUATAN TEKAN DAN TARIK PAPAN KOMPOSIT Dwi Nurul Fitriah Assyurah; Rita Desiasni; Fauzi Widyawati
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3147

Semakin meningkatnya permintaan akan bahan material ramah lingkungan untuk mengurangi dampak negatif terhadap kualitas udara global, kesehatan dan iklim global. Beberapa peneliti mulai fokus pada komposit berbasis biokomposit. Komposit dari serat alam dan partikel alam merupakan salah satu alternatif untuk komposit polimer karena keunggulannya dibandingkan dengan serat sintetis. Pada penelitian ini fraksi volume yang digunakan antara serat sisal dan serbuk kayu jati yaitu 5% serat : 15% partikel, 10% serat : 10% partikel, dan 15% serat : 5% partikel dengan volume resin tetap yaitu 80% menggunakan standar ASTM untuk uji bending dan uji tarik. Dari pengujian yang dilakukan, akan didapatkan beberapa data hasil pengujiam, nilai uji bending yaitu MOE teringgi pada variasi 15% serat : 5% partikel dengan nilai 6334,67 MPa dan nilai MOR sebesar 98,21 MPa diikuti dengan hasil terrendah pada variasi 5% serat : 15% partikel dengan nilai MOE sebesar 3987,13 MPa dan nilai MOR sebesar 68,19 MPa. Pada uji tarik didapatkan hasil tertinggi pada variasi 15% serat : 5% partikel dengan nilai nilai tegangan sebesar 71,36 MPa, regangan sebesar 1,61%, dan modulus elastisitas memperoleh nilai sebesar 44,31 GPa, pada variasi 10% serat : 10% partikel diperoleh hasil uji tarik terendah nilai tegangan 50,26 MPa, regangan sebesar 1,34%, dan modulus elastisitas sebesar 37,56 GPa. Hasil dari pengujian menunjukkan bahwa semakin meningkatnya fraksi volume serat membuat kekuakatan mekanik komposit semakin tinggi, penambahan serbuk kayu sebagai campuran filler komposit berfungsi untuk mengisi kekosongan pada pada selah-selah serat dan matriks saat proses pembuatan komposit.

Pengaruh Komposisi Serat Sisal Terhadap Konduktivitas Termal Dan Penyerapan Suara Papan Komposit fatmawati hendrik fatma; Fauzi Widyawati
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3250

Thermal conductivity and sound absorption are two key characteristics in the development of innovativecomposite materials. Thermal conductivity reflects a material's ability to conduct heat from one place toanother, while sound absorption indicates a material's ability to absorb sound waves. Composite boardsare increasingly popular in various applications, especially in the furniture industry, as they creatematerials with superior properties compared to single materials used in their production. Previousresearch has identified the potential of natural fibers as reinforcement in composite boards due to theireco-friendly and biodegradable nature. However, research combining thermal conductivity and soundabsorption in composite boards with natural fibers is still limited. This study aims to explore the influenceof various compositions of sisal fibers on the thermal conductivity and sound absorption of compositeboards. Sisal fibers were chosen as the reinforcement due to their eco-friendly nature, low density, specific strength, and high modulus. The results show a significant increase in thermal conductivity ofcomposite boards at 10% to 30% volume fraction of sisal fibers. The uniform distribution of sisal fiberswithin the composite matrix and good fiber orientation enhance the heat transfer efficiency in thecomposite. Sound absorption testing reveals that composite boards with 30% volume fraction of sisalfibers have the highest sound absorption coefficient, 0.494 at 200 Hz, while those with 10% volumefraction have the lowest coefficient, 0.059 at 800 Hz. This study unveils the potential of sisal fibercomposite boards as an eco-friendly alternative material with good thermal conductivity and effectivesound absorption. The findings are expected to contribute to the development of high-performancecomposite materials for various applications, including construction and furniture. Further research isneeded to optimize the performance of this material and explore its potential in broader industrial andenvironmental contexts.

PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI DENGAN PERLAKUAN ALKALI TERHADAP KEKUATAN MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL fatmawati hendrik fatma; Rita Desiasni; Fauzi Widyawati
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3636

The strength of the mechanical and physical properties of particle composite materials is influenced by the volume fraction of the powder and matrix. Fraction variations used are 30:70%, 50:50%, and 70:30% with the hand lay up method. The pretreatment was carried out by soaking 2% NaOH for 1 hour. The results of the MOE treatment mechanical test received the highest test value at the powder volume fraction of 30:70%, which was 6145.51 kgf/cm² and the highest MOR test value at the 30:70% volume fraction, which was 167.38 kgf/cm². Meanwhile, the highest non-treatment MOE value at the 30:70% powder volume fraction was 5540.9 kgf/cm² and the highest MOR test value at the 30:70% volume fraction was 156.6 kgf/cm². The results of the physical properties test were the highest density at the 30:70% powder volume fraction of 0.87 gr/cm³ and the highest density at the 30:70% non-treatment powder volume fraction of 0.78 gr/cm³. The results of the MOE mechanical test do not meet the JIS A 5908-2003 standard while the MOR mechanical test and physical test have met the JIS A 5908- 2003 standard. The results of microstructure testing showed that at a fraction of powder volume of 30:70% it was seen that the particles were coarser which blended perfectly with the matrix. Meanwhile, in the volume fraction of non-treatment powder 30:70% it looks finer particles and powders with a matrix seem to not glue well, this is because of the wax coating on the powder.

ANALISIS PENGARUH KONSENTRASI SIANIDA DAN RASIO PADAT CAIR PADA PROSES PELINDIAN EMAS DARI BIJIH EMAS DESA MOKONG Emsal Yanuar; Anggina Kalara; Kholida Tul Khairy; Syamsul Bahtiar; Fauzi Widyawati
Hexagon Vol 7 No 1 (2026): EDISI 11
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v7i1.7176

Emas merupakan logam mulia bernilai ekonomi tinggi yang dimanfaatkan secara luas dalam berbagai bidang, seperti perhiasan, elektronik, kesehatan, dan teknologi. Peningkatan produksi emas di Indonesia selama sepuluh tahun terakhir mendorong aktivitas eksploitasi di berbagai daerah, termasuk Desa Mokong, Kecamatan Moyo Hulu. Pengolahan emas di wilayah ini umumnya masih menggunakan metode amalgamasi yang memiliki tingkat toksisitas tinggi dan efisiensi ekstraksi yang rendah, sehingga diperlukan metode alternatif yang lebih efektif, seperti sianidasi. Penelitian ini bertujuan untuk menganalisis pengaruh konsentrasi natrium sianida (NaCN), rasio padat–cair, dan waktu pelindian terhadap persen ekstraksi emas. Variasi konsentrasi NaCN yang digunakan adalah 250, 500, dan 750 ppm dengan rasio padat–cair 1:10, 1:15, dan 1:20 serta waktu pelindian 0,5; 6; 12; 24; dan 48 jam. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi NaCN dan rasio padat–cair secara signifikan meningkatkan persen ekstraksi emas. Kondisi optimum diperoleh pada konsentrasi NaCN 750 ppm dengan rasio padat–cair 1:20 selama 48 jam, menghasilkan persen ekstraksi emas sebesar 91%. Hasil penelitian ini diharapkan dapat menjadi dasar pengembangan teknologi pengolahan emas yang lebih efektif dan berkelanjutan, khususnya bagi pertambangan emas skala kecil.

Co-Authors Amirin Kusmiran Andani Nurul Hidayah Anggina Kalara Bahtiar, Syamsul Chandra, Rico Dian Anggreini Dwi Nurul Fitriah Assyurah fatmawati hendrik fatma Hermanto, Koko I Putu Widiantara Imam Wierawansyah Eltara izzul islam Jayatri, Adella Ulyandana Kholida Tul Khairy Maksum, Hanni Malik Fajar Fatoni Marano, Lino Maulana Malik Ibrahim Muhammad Hisyam Muhammad Nurdin Muhammad, Saiful Musbihin Musbihin Nabila, Maitsa Fikri Nur Azman Prayoga Setyawan, Harry Ramadhan, Risky Ridwan Tanjung Rita Desiasni Rita Desiasni Riza Monica Setiawan, Apri Setyaningtyas, Ayunda Kinasih Shinta Esabella Solahudin, Muhammad Miftah Supianto Cibro Syamsul Bahtiar Syamsul Bahtiar Syamsul Hidayat Syamsul Hidayat Syamsul Hidayat SYAMSUL HIDAYAT Wafdan Muzakki Wiradana, Aditya Yanti, Sahri Yanuar, Emsal Yuliana Fitri Sersaningsih Zahra, Karen

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