Yulianti, Gita Amanda (2025) Analisis Penggunaan Variasi Fly Ash Tipe F PLTU Suralaya Dengan Activator Terhadap Sifat Fisik Dan Mekanik Pada Beton. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
The Suralaya coal-fired power plant in Banten produces about 700,000 tons of FABA waste annually. Fly ash (FA) can be utilized as a concrete admixture to reduce waste and carbon emissions from cement production. As it is not a single binder, FA requires alkali activators such as NaOH and Na₂SiO₃. This study employed type F fly ash from Suralaya CFPP with replacement levels of 0%, 80%, 90%, and 100%, activated by an alkaline solution at a 1:2.5 ratio of 10 M NaOH to Na₂SiO₃, with water–binder ratios (w/b) of 0.45 and 0.55. Compressive strength tests were performed on 15×30 cm cylinders at 28 days, while physical properties were examined using 1×1×1 cm cubes with Scanning Electron Microscopy (SEM). The results showed that fly ash concrete with activators exhibited high slump but poor workability due to high viscosity, rapid setting, and the absence of natural lubricants such as Ca(OH)₂ in normal concrete. At w/b 0.45, 100% FA concrete achieved 38.03 MPa, a 58.76% increase compared to normal concrete (23.96 MPa). The 90% FA mixture reached 29.91 MPa (+24.83%), while 80% FA decreased to 17.35 MPa (–27.59%). The 100% FA concrete also demonstrated optimal microstructure with low porosity, dense interface, smooth morphology, and dominant sodium (11.33%), silicon (14.73%), and calcium (5.16%). At w/b 0.55, 100% FA concrete reached 28.20 MPa, a 141.03% increase over normal concrete (11.70 MPa). The 90% FA mixture achieved 17.16 MPa (+46.67%), while 80% FA reached 14.56 MPa (+24.36%). The 100% FA concrete again showed the best performance with low porosity and compact structure. Strength improvement was due to polymerization forming N–A–S–H gel, which produced a denser matrix, unlike cement hydration that forms C–S–H and Ca(OH)₂ prone to leaching, reducing strength.
| Item Type: | Thesis (Undergraduate) | ||||||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||||||
| Divisions: | Faculty of Engineering > Departement of Civil Engineering | ||||||||||||
| Depositing User: | Gita Amanda Yulianti | ||||||||||||
| Date Deposited: | 11 Sep 2025 06:59 | ||||||||||||
| Last Modified: | 11 Sep 2025 07:00 | ||||||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/42789 |
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