Studi Perbandingan Sintesis Geopolimer secara Normal dan Terpisah dari Abu Layang PLTU Suralaya

Ekawati, Diana (2010) Studi Perbandingan Sintesis Geopolimer secara Normal dan Terpisah dari Abu Layang PLTU Suralaya. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Studi perbandingan sintesis geopolimer secara normal (N) dan terpisah (S) dari abu layang PLTU Suralaya dipelajari pada penelitian ini. Penelitian ini diawali dengan leaching Si dan Al dari abu layang. Abu layang dicampur dengan NaOH(aq) pada variasi konsentrasi NaOH(aq) 5, 10, dan 15 M; dan variasi waktu leaching 5, 10, 20, dan 30 menit. Penggunaan NaOH(aq) 15 M dan waktu 30 menit, leaching Si dan Al yang optimum untuk sintesis geopolimer berdasarkan uji leaching Si dan Al. Geopolimer disintesis secara normal dan terpisah dengan memvariasi rasio berat Na-silikat/15 M NaOH. Perbandingan berat padat/cair yang digunakan 1,5. Pada sintesis secara normal, abu layang dicampur NaOH(aq), Na-silikat(aq), dan aqua DM pada waktu yang sama. Pada sintesis secara terpisah, abu layang dicampur dengan NaOH(aq) 15 M selama 30 menit, lalu ditambah Na-silikat(aq) selama 3 menit. Kuat tekan optimum didapatkan pada geopolimer N-1,5 yaitu 31,688 × 10³ kN/m² dan geopolimer S-2,0 yaitu 43,949 × 10³ kN/m². Analisis XRD menunjukkan geopolimer N-1,5 dan S-2,0 memiliki fasa amorf dengan mullite dan quartz sebagai mineral utamanya. Analisis FTIR terlihat vibrasi ulur asimetri Si-O-Al atau Si-O-Si pada bilangan gelombang 1200–950 cm⁻¹ yang merupakan puncak-puncak karakteristik geopolimer. Mikrograf SEM menunjukkan geopolimer S-2,0 memiliki struktur lebih kompak dan homogen dibandingkan dengan geopolimer N-1,5.
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Comparative study of geopolymer normal (N) and separate (S) synthesis of Suralaya steam power plant fly ash was studied in this research. This research was conducted leaching of Si and Al from fly ash first. Fly ash mixed with NaOH(aq) with variation of NaOH(aq) concentrations 5, 10, and 15 M; and time intervals 5, 10, 20, and 30 min. Leaching of Si and Al for geopolymer synthesis reached for optimum yield by using 15 M NaOH(aq) and 30 min leaching period. Geopolymer was synthesized normal and separate by using various weight ratio of waterglass/15 M NaOH. Solid/liquid weight ratio was used 1.5. For normal synthesis, fly ash, NaOH(s), sodium silicate(s) and aqua DM were mixed at the same time. For separate synthesis, fly ash was mixed with 15 M NaOH(aq) for 30 min first, and then sodium silicate(aq) was added into the mixture for 3 min. Optimum compressive strength on N-1.5 geopolymer 31.688 × 10³ kN/m² and S-2.0 geopolymer 43.949 × 10³ kN/m². XRD analysis showed N-1.5 and S-2.0 geopolymer were amorphous which quartz and mullite as main element. FTIR analysis showed geopolymers have asymmetric stretching vibration Si-O-Al or Si-O-Si on spectra peaks 1200–950 that characteristic for geopolymer. SEM micrograph picture showed S-2.0 geopolymer has more compact and homogeny structure than N-1.5 geopolymer.

Item Type:	Thesis (Other)
Additional Information:	RSKi 547.7 Eka s
Uncontrolled Keywords:	Abu layang batubara, leaching, geopolimer, coal fly ash, leaching, geopolymer
Subjects:	Q Science > QD Chemistry > QD481 Chemical structure.
Divisions:	Faculty of Mathematics and Science > Chemistry > 47101-(S2) Master Thesis
Depositing User:	magang .
Date Deposited:	16 Oct 2026 07:14
Last Modified:	16 Oct 2026 07:14
URI:	http://repository.its.ac.id/id/eprint/145651

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