Kelan, Aprilio Rivaldo (2024) Pengaruh Konsentrasi Sodium Hidroksida Dan Rasio Activator Sodium Silikat – Sodium Hidroksida Terhadap Kuat Tekan Mortar Geopolimer Menggunakan Bahan Silica Fume – Kapur Tohor. Undergraduate thesis, Fakultas Teknik Sipil Universitas Merdeka Malang.

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Abstract

Cement has a very important role in the manufacture of building components such as concrete because of its function as a binder. In the production process, the
cement industry emits sulfur dioxide (SO2) and nitrogen oxides (NOx), which are harmful to health. The evaporation process due to cement combustion can be a source of particulate emissions if carried out continuously. The total CO2 emissions generated during the production process reach about 0.95 tons.
Geopolymer mortar is one of the innovations in the search for alternative materials to replace cement, geopolymer mortar consists of a mixture of sand, precursors, and activators. The manufacture of geopolymer mortar can use used industrial waste or natural materials such as quicklime, fly ash, rice husk ash, silica fume, iron ore residue and
others. This study aims to determine the effect of sodium hydroxide concentration and sodium silicate-sodium hydroxide activator ratio on the compressive strength
of geopolymer mortar using silica fume-toshor lime.
This geopolymer mortar research uses an experimental method based on silica fume - quicklime as a substitute for cement. The compressive strength test was conducted on 27 test specimens measuring 5 cm x 5 cm x 5 cm with independent variables in the form of sodium hydroxide concentrations of 8 M, 10 M, 12 M and sodium silicate-sodium hydroxide activator ratios of 1:1, 2:1, and 3:1 at the age of 28 days using a compressive strenght of hydraulic cement mortar based on ASTM C109 on Standard Test Method for Comprehensive Strength of Hydraulic Cement
Mortars. The results showed the compressive strength of geopolymer mortar at 10M sodium hydroxide concentration with 1:1 sodium silicate-sodium hydroxide activator ratio of 13.37 Mpa and the lowest compressive strength of geopolymer mortar at 8M sodium hydroxide concentration with 3:1 sodium silicate-sodium hydroxide activator ratio of 6.50 Mpa and the largest compressive strength of geopolymer mortar at 12M sodium hydroxide concentration with 1:1 sodium silicate-sodium hydroxide activator ratio of 15.83 Mpa

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