Pemanfaatan Fly Ash dan Sampah Gelas Sebagai Substitusi Material Pasta Beton Geopolimer Ramah Lingkungan

Ruwantari, Ira Nur (2025) Pemanfaatan Fly Ash dan Sampah Gelas Sebagai Substitusi Material Pasta Beton Geopolimer Ramah Lingkungan. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pertumbuhan industri konstruksi sekitar 1–2% per tahun mendorong kebutuhan material yang lebih ramah lingkungan. Geopolimer menjadi alternatif potensial pengganti semen Portland dengan memanfaatkan limbah industri. Penelitian ini bertujuan untuk mengkaji karakteristik pasta beton geopolimer berbasis fly ash (FA) dan sampah gelas (SG), serta menentukan suhu pemanasan optimum dalam proses pembuatannya.
Penelitian ini menggunakan variasi komposisi binder FA:SG (100:0, 70:30, 50:50, 0:100), rasio larutan alkali (NaOH 10M : Na₂SiO₃ = 1:2 dan 1:3), serta suhu pemanasan (30°C, 90°C, dan 120°C). Karakterisasi dilakukan melalui uji berat jenis dan kuat tekan untuk sifat mekanik serta Toxicity Characteristic Leaching Procedure (TCLP) untuk menilai potensi imobilisasi logam berat.
Hasil penelitian menunjukkan bahwa komposisi produk dengan rasio alkali 1:2 dan suhu pemanasan 90°C memberikan performa terbaik, dengan kuat tekan tergolong mutu sedang (20,97–23,96 MPa), serta hasil TCLP di bawah ambang batas. Kandungan silika amorf dalam SG berperan dalam meningkatkan pembentukan gel natrium aluminosilikat hidrat. Sementara suhu pemanasan sedang terbukti mendukung proses geopolimerisasi yang optimum. Temuan ini menunjukkan bahwa kombinasi FA dan SG dapat digunakan sebagai material alternatif beton geopolimer untuk mendukung inovasi konstruksi berkelanjutan.
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The construction industry’s growth of approximately 1–2% per year had driven the demand for more environmentally friendly materials. Geopolymers emerged as a potential alternative to Portland cement by utilizing industrial waste. This study aimed to examine the characteristics of geopolymer paste based on fly ash (FA) and glass waste (GP), and to determine the optimum curing temperature in the manufacturing process.
The research employed variations in binder composition (FA:GP = 100:0, 70:30, 50:50, 0:100), alkali solution ratios (NaOH 10M : Na₂SiO₃ = 1:2 and 1:3), and curing temperatures (30°C, 90°C, and 120°C). Characterization included specific gravity and compressive strength tests to assess mechanical properties, as well as the Toxicity Characteristic Leaching Procedure (TCLP) to evaluate heavy metal immobilization potential.
The results showed that the 50% FA : 50% GP composition with a 1:2 alkali ratio and a curing temperature of 90°C provided the best performance, achieving compressive strength in the moderate category (20.97–23.96 MPa) and TCLP values below regulatory limits. The presence of amorphous silica in glass powder enhanced the formation of sodium aluminosilicate hydrate (N-A-S-H) gel, while moderate curing temperatures facilitated optimal geopolymerization. These findings suggest that a combination of FA and GP can be effectively used as an alternative material for geopolymer concrete in support of sustainable construction practices.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Fly ash, pasta beton geopolimer, sampah gelas, Fly ash, geopolymer concrete paste, glass waste
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD194.6 Environmental impact analysis T Technology > TD Environmental technology. Sanitary engineering > TD427.F58 Fly ash T Technology > TD Environmental technology. Sanitary engineering > TD794.5 Recycling (Waste, etc.) T Technology > TD Environmental technology. Sanitary engineering > TD898.8.C67 Waste disposal
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Environmental Engineering > 25101-(S2) Master Thesis
Depositing User:	Ira Nur Ruwantari
Date Deposited:	22 Jul 2025 06:21
Last Modified:	22 Jul 2025 06:21
URI:	http://repository.its.ac.id/id/eprint/120495

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