Andi Yusra, Muttaqin Hasan, Husni Husin, Teuku Budi Aulia
The study aims to explore the early age strength of geopolymer mortars using three precursors: palm shell ash, rice husk ash, and clamshell ash, with varying silica fume additions (0%, 5%, 10%, 15%, 20%). The mortars were made with a 3:2 ratio of precursor to activator solution, using sodium hydroxide and sodium silicate in a 1:2 ratio. Beam specimens (4 cm x 4 cm x 16 cm) underwent a flexural test at three days old, followed by a compression test. Results show the highest compressive strength for geopolymer mortar with palm shell ash (GM-PSA) was 36.03 MPa, geopolymer mortar with clamshell ash (GM-CSA) was 32.47 MPa and geopolymer mortar with rice husk ash (GM-RHA) was 36.56 MPa. All of them were reached at 20% silica fume addition. The highest flexural strengths were also reached at 20% silica fume addition, which are 0.31 MPa, 0.24 MPa, and 0.34 MPa for GM-PSA, GM-CSA, and GM-RHA, respectively. Adding silica fume significantly enhanced the compressive and flexural strength of GM-RHA, GM-PSA, and GM-CSA. © The Authors, published by EDP Sciences.
Doctoral Program in Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia; Department of Civil Engineering, Universitas Teuku Umar, Meulaboh, Indonesia; Department of Civil Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia; Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia
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