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All Journal Jurnal Sains Materi Indonesia CHEMICA Jurnal Teknik Kimia Jurnal Fisika FLUX Jurnal Abdi: Media Pengabdian Kepada Masyarakat
Ufafa Anggarini
Universitas Internasional Semen Indonesia
Humanities Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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THE EFFECT OF REVERSE FLOTATION METHOD ON SILICA SAND AS WATERPROOFING MORTAR Okky Putri Prastuti; Ayu Tri Septianingrum; Elisya Dianty Fatmala; Ufafa Anggarini; Tri Eddy Susanto; Nuvixca Dewi Milangsari
Jurnal Sains Materi Indonesia Vol 22, No 1: OCTOBER 2020
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2020.22.1.5991

Abstract

THE EFFECT OF REVERSE FLOTATION METHOD ON SILICA SAND AS WATERPROOFING MORTAR. Waterproof fabrication mortar cement by silica sand using reverse flotation silica (RFS) method was evaluated by waterproof absorption coefficient, compressive strength test, attractive test, and contact angle. RFS is used to replace waterproof agent and aggregate mortar to reduce cost. The aims of this experiment are to know the RFS process, the ratio between waterproof mortar cement with RFS and mortar, to determine performance and characteristic waterproof mortar cement. Methods used are prepared RFS, mortar cement fabrication, and testing (compressive strength, tensile strength, permeability, contact angle, XRF, FTIR, SEM, BET). Variable used are ratio cement/silica sand, concentrations of CaCl2, curing time, oleic acid, and sodium oleate addition. Optimum collector addition is obtained by oleic acid with compress strength 167.65 kg/cm2, tensile strength 0.16 MPa, permeability 4.6 cm, and contact angle 95°. Curing inside water effect and outside temperature give compress strength 167.65 kg/cm2 and 163.24 kg/cm2, permeability curing inside the water and outside temperature are 4.6 cm and 12 cm. Optimum CaCl2 addition is gained at CaCl2 1.8M with compress strength 64.29 kg/cm2, tensile strength 0.15 MPa, permeability 2.4 cm, contact angle 95°. Optimum ratio cement/RFS is 1:1 with compress strength 167.65 kg/cm2, tensile strength 0.16 MPa, permeability 4.6 cm, and contact angle 950.
Penerapan Metode Taguchi pada Perancangan Eksperimen Beton Geopolimer Berbasis Abu Layang ufafa anggarini; Claudia Kosada; Ndaru Candra Sukmana
CHEMICA: Jurnal Teknik Kimia Vol 4, No 1 (2017): Juni 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.399 KB) | DOI: 10.26555/chemica.v4i1.6776

Abstract

PT Petrokima Gresik produces fly ash from coal burning about 8048,89 tons in 2015. In general, one ton of coal burning can produce around 0.15 to 0.17 tons of fly ash waste. Fly ash waste can be utilized as a mixture where the main elements of fly ash are aluminum and silica, fulfilling criteria as the material having cement and geopolymer properties. Geopolymer preparation can be done by the sol-gel method at low temperature, where the emission of CO2 gas produced is a minimum amount. The problem faced is finding the right composition of geopolymer so that it produces the maximum compressive strength. One way is by designing a Taguchi experiment. The choice of the Taguchi method is based on the advantages of this method that can combine experimental results through controlled factors and optimal levels so it can achieve the maximum compressive strength of geopolymer. This research used 3 levels (-1,0,1) and 4 factors of fly ash, the solid/liquid ratio (SL), the molarity of NaOH (A), Sand/pasta geopolymer ratio (P/PG). Anova test showed significant effect on compressive strength of fly ash, S / L and A with value of 12,27> 2,90; 61,12> 2,90; 19,477> 2,90. While the value for P / PG is 1.92 <2.90 where the value of F-statistic is less than F table which means P / PG does not significantly affect the compressive strength of Geopolymer. With S/N higher is better to know the optimum composition of fly ash, S / L, A and P / PG equal to: 370 gram; 2.33 (70:30); 9 Molar, and 1.5. The prediction of Geopolymer maximum compressive strength with Taguchi method was obtained 18,71 Mpa. Keywords:  Fly ash, Optimation, Taguchi, Geopolymer
Synthesis and Characterization of Reduced Graphene Oxide from Fiber of Borassus Flabelifer by Activation Method Fandi Angga Prasetya; Ufafa Anggarini; Salim Mustofa; Syarifatus Sholihah; Fathur Iqbal; Hanafi Hanafi; Dode Bara Septyano
Jurnal Fisika FLUX Vol 16, No 1 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1138.366 KB) | DOI: 10.20527/flux.v16i1.5876

Abstract

Reduced Graphene Oxide (RGO) has been successfully synthesized by calcination process at 4000C for 4 hours followed by activation with NaOH 1 M. Carbonization is the last process with variations in heating at 6500C, 7500C, 8500C, and 9500C for 1 hour (heating rate 100C / minute). DSC-TGA data shows that there is advanced decomposition at high temperatures, this is confirmed by SEM data which shows the amount of porosity which is getting higher with a size that decreases with temperature. XRD data shows phase differences at low temperatures with a trend of higher levels of crystallinity at high temperatures. Raman spectroscopy data showed an ID / IG ratio of 2.607 and 1.007 on Borassus Flabelifer L with carbonization at 6500C and 9500C respectively. The ID / IG value which is getting closer to 1 indicates that the carbon available in Borassus Flabelifer L has undergone phase changes such as Graphene with a little Oxide commonly called RGO
PELATIHAN DAN PENYULUHAN PEMANFAATAN POTENSI IKAN BANDENG DESA GUMENO KABUPATEN GRESIK SEBAGAI PRODUK BERNILAI ABON IKAN BANDENG ufafa anggarini
Jurnal ABDI: Media Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2020)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ja.v5n2.p65-70

Abstract

The community service activities have been done in the form of training and extension of milkfish utilization as potential product from Gumeno Village as Abon Ikan Bandeng (Milkfish Abon). Milkfish as the main commodity in Gumeno was sold at low price especially during harvest time, so the profit of fish farmer is very limited. This community service activities is expected to improve the ability and knowledge of the community about how to process milkfish into abon that contain high nutrition, provide knowledge for for the community how to packing product by promoting hygiene and marketing products through social media. The result that obtained in this activity was the achievement of the economic value of Milkfish Abon and the increase of the ability of housewife who joined in PKK organization in processing, packing, and marketing of their product.
Co-Authors Ayu Tri Septianingrum Claudia Kosada Dode Bara Septyano Elisya Dianty Fatmala Fandi Angga Prasetya Fathur Iqbal Hanafi Hanafi Ndaru Candra Sukmana Nuvixca Dewi Milangsari Okky Putri Prastuti Salim Mustofa Syarifatus Sholihah Tri Eddy Susanto