Zulna, Dzaky Perkasa Tri and -, Prof. Ir. Mochamad Solikin S.T., M.T., Ph.D. (2026) ANALISIS PENGARUH VARIASI PERBANDINGAN KADAR AGREGAT HALUS 1:2,75-1:3,5 SEBAGAI BAHAN SUBTITUSI MORTAR TERHADAP KUAT TEKAN, PENYERAPAN, DENSITAS, DAN DURABILITAS MORTAR GEOPOLIMER. Skripsi thesis, Universitas Muhammadiyah Surakarta.
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Abstract
Mortar is a construction material composed of a binder, fine aggregate, and water, which functions as an adhesive in masonry and plastering works. Conventional mortar generally uses Portland cement as the primary binder; however, its production generates significant carbon dioxide emissions. Therefore, fly ash-based geopolymer mortar has been developed as a more environmentally friendly alternative. This study aims to analyze the effect of fine aggregate ratio variations on the compressive strength, water absorption, density, and durability of geopolymer mortar and to compare its performance with conventional mortar. The materials used in this study were Class C fly ash, Merapi sand, sodium hydroxide (NaOH), and sodium silicate (Na₂SiO₃). The binder-to-fine aggregate ratios investigated were 1:2.75 and 1:3.5. Cube specimens measuring 5 × 5 × 5 cm were prepared and tested at the age of 28 days. The results showed that the geopolymer mortar with a ratio of 1:2.75 achieved the highest average compressive strength of 13.84 MPa, while the 1:3.5 ratio produced a compressive strength of 8.90 MPa. Water absorption decreased from 12.58% to 7.63% as the proportion of fine aggregate increased. The density of geopolymer mortar also decreased from 2.05 g/cm³ to 1.86 g/cm³. Durability testing revealed that immersion in a sodium chloride (NaCl) solution reduced the compressive strength of geopolymer mortar, whereas conventional mortar tended to show an increase in compressive strength. Overall, the 1:2.75 ratio provided the best performance for geopolymer mortar, resulting in higher compressive strength and density than the 1:3.5 ratio.
| Item Type: | Thesis (Skripsi) |
|---|---|
| Subjects: | T Technology > TA Civil Engineering T Technology > TH Building construction |
| Divisions: | Fakultas Teknik > S1 Teknik Sipil |
| Depositing User: | DZAKY PERKASA TRI ZULNA |
| Date Deposited: | 14 Aug 2026 02:12 |
| Last Modified: | 14 Aug 2026 02:12 |
| URI: | http://eprints.ums.ac.id/id/eprint/147518 |
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