Talu, Intan Sari Dapa (2024) Pengaruh Kosentrasi Sodium Hidroksida Dan Rasio Agregat Halus-Binder Terhadap. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

The use of concrete as a construction material has always increased from year to year. Concrete is mixed with Portland cement as a binder. The increasinguse of concrete can reduce one of the natural resources needed, namely cement.
Increased cement production will produce CO2, which causes air pollution. Oneinnovative alternative to replace the use of Portland cement is the manufacture ofa binder in the form of geopolymer mortar. Geopolymer mortar is an organic alumino silicate compound, which is synthesized from by-product materials such as silica fume, fly ash, and quicklime. The purpose of this study was to determine the
effect of sodium hydroxide concentration and the ratio of fine aggregate-binder onthe compressive strength of geopolymer mortar using silica fume-quicklime.
This study made geopolymer mortar based on silica fume-quicklime as a substitute for cement with 27 cube-shaped test objects measuring 5cm x 5cm x 5cm with independent variables, namely the ratio of fine aggregate-binder 40%: 60%, 60%: 40%, and 25%: 75%. Compressive strength testing was carried out at the age of 28 days using a compressive strength of hydraulic cement mortar tester based on
ASTM C109. The results of the study on the compressive strength of geopolymer mortar at a sodium hydroxide concentration of 12M with the highest compressive strength
of 10.17 Mpa at a fine aggregate-binder ratio of 60%:40% and at a sodium hydroxide concentration of 8M with the lowest compressive strength of 6.50 Mpa at a fine aggregate-binder ratio of 40%:60%

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