Pengaruh Penambahan Borax terhadap Setting Time Pasta Geopolymer Berbahan Dasar Fly Ash dan Ground Granulated Blast Furnace Slag
Mhargareta Putri1, Iman Satyarno1 *, Djoko Sulistyo1
1Departemen Teknik Sipil dan Lingkungan, Universitas Gadjah Mada, Yogyakarta, INDONESIA
*Corresponding author: imansatyarno@ugm.ac.id INTISARI
Beton geopolymer merupakan salah satu solusi untuk mengatasi emisi gas CO2 yang tinggi akibat penggunaan material semen. Dalam penerapannya penggunaan beton geopolymer ini memiliki beberapa kekurangan antara lain workability yang rendah dan flash setting yang sering terjadi pada campuran. Dalam penelitian ini beberapa parameter diinvestigasi pengaruhnya terhadap setting time pasta geopolymer, parameter yang diselidiki adalah molaritas sodium hidroksida dari 10 M hingga 14 M dengan peningkatan setiap 2 M, perbandingan alkali/(FA+GGBFS) (A) yaitu 0,35 dan 0,45, perbandingan FA/GGBFS yaitu 50:50 dan 70:30, perbandingan larutan alkali (R) yaitu 1,5 dan 2, dan perbandingan penggunaan borax yaitu 1%, 3%, dan 5% untuk menyelidiki pengaruh yang ditimbulkan terhadap setting time dan kuat tekan. Penambahan borax terbukti dapat meningkatkan initial setting time hingga 30 menit pada variasi rasio 5%. Meskipun borax dapat meningkatkan setting time, namun penggunaan borax ini memiliki kelemahan yaitu dapat menurunkan kuat tekan, pada persentase 0% yaitu 94,54 MPa dan pada persentase 5% mengalami penurunan menjadi 60,96 MPa.
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