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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL JURNAL KIMIA SAINS DAN APLIKASI
Roni Adi Wijaya
Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang 50271|Diponegoro University|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Engineering

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Pemanfaatan Fly Ash Limbah Pembakaran Batubara sebagai Zat Mineral Tambahan (Additive) terhadap Perbaikan Kualitas dan Kuat Tekan Semen Wijaya, Roni Adi; Astuti, Yayuk; Wijayanti, Septi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 27, Nomor 1, JULI 2021
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (410.244 KB) | DOI: 10.14710/mkts.v27i1.31558

Abstract

Serangkaian pengujian dilakukan untuk menentukan pengaruh penambahan fly ash limbah pembakaran batubara sebagai zat mineral tambahan (additive) terhadap perbaikan kualitas dan kuat tekan semen sesuai Standar Nasional Indonesia (SNI 15-2049-2004). Metode penelitian meliputi preparasi sampel, pembuatan semen dengan variasi fly ash 0%, 5%, 8%, 12%, dan 15%, uji sifat kimia dan fisika semen. Parameter yang diukur yaitu kadar komposisi kimia (%) menggunakan X-Ray Fluorescence Spectroscopy (XRF) ARL 9800 OASIS, kadar freelime (%) secara volumetri, kadar Insoluble Residue (%) secara gravimetri, kuat tekan (kg/cm2), dan kehalusan semen (cm2/g). Hasil penelitian menunjukkan bahwa penambahan fly ash meningkatkan kandungan SiO2 semen, sehingga memperbanyak senyawa C3S dan C2S yang merupakan komponen kuat tekan semen. Selain itu, penambahan fly ash berbanding lurus dengan kadar IR, kuat tekan, kehalusan, dan berbanding terbalik dengan kadar freelime. Sehingga penambahan fly ash dapat memperbaiki kualitas semen dengan menaikan komponen kimia, menaikan kuat tekan, dan mengurangi keretakan atau ekspansi semen.
Synthesis, Characterization of Ag2s from AgCl Waste of Argentometry Titration with Heating Temperature Variations and Its Application as a Temperature Sensor Based on Negative Temperature Coefficient (NTC) Gunawan Gunawan; Sarahtrinita Glikeria Like Megawati; Nor Basid Adiwibawa Prasetya; Roni Adi Wijaya
Jurnal Kimia Sains dan Aplikasi Vol 25, No 8 (2022): Volume 25 Issue 8 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.25.8.292-299

Abstract

Synthesis of Ag2S from AgCl waste of argentometric titration with heating temperature variations as a temperature sensor has been done. This study aims to synthesize Ag2S and examine the effect of heating temperature on crystal quality and electrical characteristics as a temperature sensor based on the Negative Temperature Coefficient (NTC). Ag2S synthesis was carried out by precipitation in a water bath with various heating temperatures of 40°C, 60°C, and 80°C. The success of the synthesis was confirmed by X-Ray Diffraction (XRD) with a typical peak of 2θ from Ag2S standard at 29.07°, 31.60°, 36.97°, 37.81°, and the highest crystallinity was obtained at a heating temperature of 60°C. Meanwhile, UV-Vis Diffuse Reflectance Spectroscopy (DRS UV-Vis) showed a band gap corresponding to Ag2S (0.9-1.05 eV). Furthermore, the Ag2S powder was made into pellets and applied as a temperature sensor. Then the resistance value and the electrical characteristics of the resulting sensor were measured. The best resistance was obtained from Ag2S synthesized at a temperature of 60°C with constant (B) and sensitivity (α) values of 2974 K and −3.35%, respectively. This indicated that Ag2S had been successfully synthesized, and the best sensor quality was obtained from Ag2S heated at a temperature of 60°C.
Co-Authors Gunawan Gunawan Nor Basid Adiwibawa Prasetya Sarahtrinita Glikeria Like Megawati Wijayanti, Septi Yayuk Astuti