MIRANDA JUWITA SARI, NIM 112022034 (2026) PENGARUH VARIASI RASIO FLY ASH DAN AGREGAT HALUS TERHADAP KARAKTERISTIK MIKROSTRUKTUR MORTAR GEOPOLIMER BERBASIS SCANNING ELECTRON MICROSCOPE. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

PENGARUH VARIASI RASIO FLY ASH DAN AGREGAT HALUS TERHADAP KARAKTERISTIK MIKROSTRUKTUR MORTAR GEOPOLIMER BERBASIS SCANNING ELECTRON MICROSCOPE (SEM) INTISARI Miranda Juwita Sari (112022034) – Teknik Sipil - Pengaruh Variasi Rasio Fly Ash dan Agegat Halus Terhadap Karakteristik Mikrostruktur Mortar Geopolimer Berbasis Scanning Electron Microscope (SEM). Isu keberlanjutan lingkungan mendorong pengembangan mortar geopolimer berbahan fly ash sebagai pengganti semen portland untuk mengurangi limbah kontruksi dan emisi CO2 dari industri semen. Dalam mortar geopolimer, rasio fly ash dan agregat halus berpengaruh terhadap sifat mekanik dan mikrostruktur mortar geopolimer, seperti kuat tekan, porositas, dan tingkat kerapatan. Penelitian ini bertujuan untuk mengetahui pengaruh variasi rasio fly ash dan agregat halus terhadap mortar geopolimer serta menganalisis mikrostruktur menggunakan scanning electron microscope (SEM). Penelitian ini menggunakan metode eksperimental di laboratorium dengan fly ash sebagai prekusor. Larutan alkali aktivator yang terdiri dari kombinasi natrium hidroksida (NaOH) dengan molaritas 14 M dan natrium silika (Na2SiO3) dengan perbandingan 2,5 : 1. Dengan penambahan superplasticizer sebesar 2% dari berat fly ash. Variasi rasio fly ash dan agregat halus yang digunakan adalah 1:0,5, 1:1, 1:1,5, 1:2, dan 1:2,5. Benda uji berupa kubus berukuran 50x50x50 mm yang dicuring pada suhu 60°C selama 24 jam, pengujian meliput berat jenis, kuat tekan, dan analisis mikrostruktur SEM pada umur 28 hari. Hasil pengujian menunjukkan bahwa nilai kuat tekan tertinggi diperoleh pada variasi 1:1 sebesar 48,67 MPa dengan nilai berat jenis rata-rata sebesar 2184,00 kg/m3 . Hasil SEM menunjukkan bahwa pada variasi 1:1 memiliki mikrostruktur yang lebih padat dengan ukuran pori sebesar 0,6-1,2 µm dan microcrack sebesar 0,7-2,0 µm. Sementara itu, variasi lain mengalami penurunan kuat tekan dan berat jenis yang diakibat oleh munculnya rongga serta microcrack yang lebih besar, Dengan demikian, dapat disimpulkan bahwa variasi fly ash dan agregat halus optimum karena menghasilkan mortar geopolimer dengan mikrostruktur yang lebih padat, ukuran pori dan mikrocrack yang lebih kecil, serta kuat tekan yang tinggi. THE EFFECT OF VARIATIONS IN THE RATIO OF FLY ASH AND FINE AGGREGATE ON MICROTRUCTURAL CHARACTERISTICS OF GEOPOLYMER MORTAR AS OBSERVED BY SCANNING ELECTRON MICROSCOPE (SEM) ABTRACT Miranda Juwita Sari (112022034) – Civil Engineering - The Effect Of Variations in the Ratio Of Fly Ash and Fine Aggregate On Microstructural Characterisitcs of Geopolymer Mortar as Observed by Scanning Electron Microscope (SEM). Environmental sustainability concerns have driven the development of fly ash- based geopolymer mortar as a subtitute for portland cement industry. Ingeopolymer mortar, the ratio of fly ash to fine aggregate effects the mechanical properties and microstructure of the mortar, such as dompressive the effect of varying fly ash and fine aggregate ratios on geopolymer mortar and to analyze the microstrukture using a scanning electron microscope (SEM). The study employed an laboratory experimental method using fly ash as the precursor. The alkali activator solution consisted of a combination of sodium hydrixide (NaOH) with as molarity of 14 M and sodium silicate (Na2SiO3) in a 2,5 : 1 ratio. A superplasticizer was added at a concentration of 2 % by weight of the fly ash. The variations in the fly ash to fine aggregate ratio used were 1:0,5, 1:1, 1:1,5, 1:2, and 1:2,5. The test specimens were 50X50X50 mm cubes cured at 60°C for 24 hours, testing included bulk density, compressive strength, and SEM microstructural analysis at 28 days. The test result showed that the highest compressive strength was obtained in the 1:1 mixture, at 48,67 MPa, with an average bulk density of 2184,00 kg/m3. SEM result indicated that the 1:1 mixture had a denser microstructure with pore sizes of 0,6- 1,2 µm and microcracks of 0,7-2,0 µm. Meanwhile, the other variations exhibited a desrease in compressive strength and density due to the presence of voids and large microcracks.. Thuse, it can be concluded that the 1:1 fly ash to fine aggregate ratio is optimal because it produces geopolymer mortar with a denser microstructure, smaller pore and microcrack sizes, and high compressive strength.

Item Type:	Thesis (Skripsi)
Additional Information:	Pembimbing : 1. Ir. Erny Agusri, M.T 2. Adji Sutama, S.T., M.T
Uncontrolled Keywords:	Kata kunci: mortar geopolimer, fly ash, agregat halus, Scanning Electron Microscope. Keyword: geopolymer mortar, fly ash, fine aggregate, scanning electron microscope.
Subjects:	Teknik Sipil > Bahan-bahan Bangunan
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	22 Aug 2026 03:23
Last Modified:	22 Aug 2026 03:23
URI:	http://repository.um-palembang.ac.id/id/eprint/37038

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