Di jaman moderen ini beton merupakan salah satu material utama dalam pembangunan sebuah struktur. Dengan demikian jumlah bahan dalam material beton semakin tahun semakin berkurang salah satunya Portland Cement yang mana mempunyai dampak negati yang besar terhadap lingkungan akibat pelepasan emisi gas. Dengan demikian dilakukan penelitian mengenai beton tanpa menggunakan Portland Cement yaitu dengan menggunakan alternative Dry Geopolymer  yang mana diharapkan mampu mengganti peran Portland Cement tanpa mengurangi kekuatan.

        Penelitian ini bertujuan untuk mengetahui pengaruh variasi NaOH terhadap Na₂SiO₃ terhadap nilai kuat tekan dry geopolymer mortar metode dry mixing pada kondisi rasio abu terbang terhadap aktivator 2:1.

        Dalam hasil penelitian menunjukkan bahwa kuat tekan tertinggi didapat pada variasi campuran NaOH terhadap Na₂SiO₃ 1:2,5 sebesar 34,05 MPa, yang mana banyaknya Na₂SiO₃ sangat mempengaruhi nilai Kuat tekan dry geopolymer mortar dikarenakan kandungan Na₂O berfungsi untuk mempercepat reaksi geopolimer. Namun jika Na₂O didalamnya terlalu tinggi maka dapat menyebabkan menurunnya kuat tekan mortar. Hal ini dikarenakan tidak seimbangannya komposisi NaOH terhadap Na₂SiO₃.

Kata kunci: Pengaruh Semen Portland, Binder Dry Geopolymer, Kuat Tekan Mortar Dry Geopolymer.

In this modern era, concrete is one of the main materials in the construction of a structure. Thus the amount of material in concrete material is decreasing over the years, one of which is Portland Cement which has a large negative impact on the environment due to the release of gas emissions. Thus research on concrete without using Portland Cement is to use an alternative Dry Geopolymer which is expected to be able to replace the role of Portland Cement without reducing strength.

This study aims to determine the effect of variations of NaOH on Na2SiO3 on the compressive strength value of dry geopolymer mortar dry mixing method on the condition of the ratio of fly ash to activator 2: 1.

The results showed that the highest compressive strength was obtained in the variation of NaOH mixture against Na2SiO3 1: 2.5 of 34.05 MPa, which the amount of Na2SiO3 greatly influenced the compressive strength value of dry geopolymer mortar because the Na2O content functioned to accelerate the geopolymer reaction. But if the Na2O in it is too high, it can cause a decrease in mortar compressive strength. This is due to the unbalanced composition of NaOH against Na2SiO3.

Keywords: Effect of Portland Cement, Dry Geopolymer Binder, Compressive Strength of Dry Geopolymer Mortar.