Fajri Fajri, Amir Fauzi, Muhammad Reza, Zairipan Jaya, Maulizar Maulizar
Geopolymer mortar is made without using cement as a base material, but using other materials that contain silica and alumina. This element is widely found in industrial waste materials, such as fly ash. Fly ash is obtained from the residue of burning coal in a steam power plant. Geopolymer mortar has the disadvantage of low flexural strength, so it is brittle and breaks easily. This study aims to improve the flexural strength of fly ash-based geopolymer mortar with the addition of polypropylene fibers. The percentages of fiber added were 0.4%, 0.8%, 1.2%, and 1.6% by weight of fly ash. Fiber mixing to the dry mortar mixture. Tests conducted in the form of setting time, workability, compressive strength, flexural strength and visual observation of fiber attachment. The size of the specimens used is a 50x50x50mm cube and a 30x30x130mm block. Mechanical properties testing was carried out at 1, 3, 7 and 28 days of mortar age. The test results showed that addition of polypropylene fibers at 0,4%, increased compressive strength by 117,82%, namely 17,97MPa and the flexural strength increased by 76,06%, to 7,87MPa at 0,8% fiber percentage. Visual observation showed that geopolymer mortar has a more ductile failure behavior. © 2023 American Institute of Physics Inc.. All rights reserved.
Civil Engineering Department, Politeknik Negeri Lhokseumawe, Aceh, Indonesia; Geopolymer and Green Technology Research Center, Aceh, Indonesia; Commerce Department Politeknik Negeri Lhokseumawe, Aceh, Indonesia
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