AMALIA DARAYANI, NIM. 112022045 (2026) PENGARUH VARIASI RASIO FLY ASH DAN AGREGAT HALUS TERHADA BERAT JENIS DAN KUAT TEKAN MORTAR GEOPOLIMER. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

PENGARUH VARIASI RASIO FLY ASH DAN AGREGAT HALUS TERHADAP BERAT JENIS DAN KUAT TEKAN MORTAR GEOPOLIMER INTISARI Amalia Darayani (112022045) – Teknik Sipil – Pengaruh Variasi Rasio Fly Ash Dan Agregat Halus Terhadap Berat Jenis Dan Kuat Tekan Mortar Geopolimer Mortar geopolimer merupakan mortar yang menggunakan bahan geopolimer sebagai bahan pengganti semen. Pengembangan mortar geopolimer pada dasarnya bertujuan untuk menghasilkan material bangunan yang ramah lingkungan, untuk mengurangi emisi CO2 pada sektor industri. Mortar geopolimer adalah material pengikat yang komposisinya didominasi oleh jaringan aluminosilikat hasil aktivasi alkali, di mana karakteristik material sangat dipengaruhi oleh bentuk, ukuran, dan gradasi agregat halus yang digunakan. Oleh karena itu, kajian terhadap variasi rasio fly ash dan agregat halus perlu dilakukan untuk mendapatkan formula mortar geopolimer yang optimal. Penelitian ini menggunakan metode eksperimental di laboratorium dengan fly ash sebagai perkusor. Larutan alkali aktivator terdiri dari kombinasi natrium hidroksida (NaOH) dengan molaritas 14 M dan natrium silikat (Na2SiO3) dengan perbandingan tetap 2,5 : 1. Variasi rasio fly ash dan agregat halus yang digunakan adalah 1:0,5, 1:1, 1:1,5, 1:2, dan 1:2,5. Dengan penambahan superplasticizer sebesar 2% dari berat fly ash. Benda uji berbentuk kubus dengan ukuran 50x50x50 mm di curing dengan cara dioven pada suhu 600C selama 24 jam, kemudian dilakukan uji berat jenis dan kuat tekan pada umur 14, 21, dan 28 hari. Hasil penelitian menunjukkan bahwa variasi rasio fly ash dan agregat halus berpengaruh terhadap berat jenis dan kuat tekan mortar geopolimer. Nilai optimum diperoleh pada rasio 1:1 yang menhasilkan nilai berat jenis yang baik dan kuat tekan yang optimum. Rendahnya kuat tekan tersebut disebabkan oleh proses pembentukan ikatan aluminosilikat yang belum berlangsung secara sempurna. Dengan demikian, dapat disimpulkan bahwa pengendalian komposisi fly ash dan agregat halus sangat penting untuk memperoleh mortar geopolimer dengan kepadatan dan kekuatan optimum. THE EFFECT OF VARYING RATIOS OF FLY ASH AND FINE AGGREGATE ON THE SPECIFIC GRAVITY AND COMPRESSIVE STRENGTH OF GEOPOLYMER MORTAR ABSTRACT Amalia Darayani (112022045) – Civil Engineering – The Effect of Fly Ash and Fine Aggregate Ratio Variations on the Density and Compressive Strength of Geopolymer Mortar Geopolymer mortar is a type of mortar that uses geopolymer material as a substitute for cement. The development of geopolymer mortar aims to produce environmentally friendly construction materials in order to reduce CO2 emissions in the industrial sector. Geopolymer mortar is a binding material whose composition is dominated by an aluminosilicate network formed through alkali activation, where the material characteristics are highly influenced by the shape, size, and gradation of the fine aggregate used. Therefore, a study on the variation of fly ash and fine aggregate ratios is necessary to obtain the optimum geopolymer mortar formulation. This research employed an experimental laboratory method using fly ash as the precursor material. The alkaline activator solution consisted of a combination of sodium hydroxide (NaOH) with a molarity of 14 M and sodium silicate (Na2SiO3) with a fixed ratio of 2.5:1. The variations of fly ash to fine aggregate ratios used were 1:0.5, 1:1, 1:1.5, 1:2, and 1:2.5, with the addition of 2% superplasticizer based on the weight of fly ash. The specimens were cube-shaped with dimensions of 50 × 50 × 50 mm and were cured in an oven at a temperature of 60°C for 24 hours. Density and compressive strength tests were then conducted at the ages of 14, 21, and 28 days. The results showed that variations in the ratio of fly ash and fine aggregate affected the density and compressive strength of geopolymer mortar. The optimum value was obtained at the 1:1 ratio, which produced good density and optimum compressive strength. The low compressive strength was caused by the incomplete formation process of aluminosilicate bonds. Therefore, it can be concluded that controlling the composition of fly ash and fine aggregate is very important in obtaining geopolymer mortar with optimum density and strength.

Item Type:	Thesis (Skripsi)
Additional Information:	Pembimbing : 1. Ir. Erny Agusri, S.T 2. Adji Sutama, S.T., M.T
Uncontrolled Keywords:	Kata kunci: mortar geopolimer, fly ash, agregat halus, berat jenis, kuat tekan. Keywords: geopolymer mortar, fly ash, fine aggregate, density, compressive strength.
Subjects:	Teknik Sipil > Bahan-bahan Bangunan
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	22 Aug 2026 04:05
Last Modified:	22 Aug 2026 04:05
URI:	http://repository.um-palembang.ac.id/id/eprint/37046

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