Studi Kinerja Mechanical Properties pada Beton High Volume Fly Ash dengan Variasi Substitusi Kalsium Karbonat

Alfariz, Fiki Dwiki (2025) Studi Kinerja Mechanical Properties pada Beton High Volume Fly Ash dengan Variasi Substitusi Kalsium Karbonat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan batubara sebagai sumber energi memiliki dampak signifikan terhadap lingkungan dan pemanasan global serta menghasilkan limbah berupa fly ash dan bottom ash. Limbah fly ash memiliki potensi besar untuk digunakan sebagai pengganti semen, mengingat material ini memiliki karakteristik yang mirip dengan semen dan memiliki sifat pozzolanik. Substitusi semen dengan fly ash dalam proporsi yang signifikan dapat dilakukan melalui teknologi beton High Volume Fly Ash (HVFA). Penelitian ini dilakukan dengan membuat silinder beton dengan substitusi fly ash pada berat semen. Benda uji yang digunakan dalam penelitian ini berjumlah 126 benda uji silinder dengan ukuran 100 mm x 200 mm terdiri dari 9 variasi fly ash dan CaCO3 pada pengujian 7, 14, dan 28 hari. Metode eksperimental penelitian ini menggunakan standar SNI 2847:2019 yang meliputi pengujian kuat tekan, kuat tarik belah, porositas, densitas, water absorption, dan Ultrasonic pulse velocity (UPV) beton dengan bahan campuran limbah fly ash 0% (OPC), 35% (FA35C5), 37% (FA37C3), 39% (FA39C1), 40% (FA40), 55% (FA55C5) 57% (FA57C3), 59% (FA59C1) dan 60% (FA60) dan penambahan CaCO3 sebesar 1%, 3% dan 5%. Hasil penelitian menunjukkan penambahan CaCO3 sebesar 1%, 3% dan 5% pada variasi fly ash 35%, 37%, 39%, 55%, 57%, dan 59% mempengaruhi sifat mekanik beton High Volume Fly Ash. Semakin bertambahnya kadar CaCO3 maka nilai kuat tekan, kuat tarik belah, porositas, water absorption, densitas dan UPV test cenderung menurun yang mengindikasikan beton semakin baik. Variasi FA39C1 dengan substitusi fly ash 39% dan CaCO3 1% menunjukan hasil yang optimum dengan nilai kuat tekan, kuat tarik belah, porositas, water absorption, densitas dan UPV test berturut-turut sebesar 29,70 Mpa, 2,71 Mpa, 8,42%, 3,50%, 2,69 gr/cm³ dan 4571,67 m/s.
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The utilization of coal as an energy source has a significant impact on the environment and global warming and produces waste in the form of fly ash and bottom ash. Fly ash waste has great potential to be used as a cement substitute, given that this material has similar characteristics to cement and has pozzolanic properties. The substitution of cement with fly ash in significant proportions can be done through High Volume Fly Ash (HVFA) concrete technology. This research was conducted by making concrete cylinders with fly ash substitution in the weight of cement. The test specimens used in this study amounted to 126 cylindrical test specimens with a size of 100 mm x 200 mm consisting of 9 variations of fly ash and CaCO3 at 7, 14, and 28 days. The experimental method of this research uses the standard SNI 2847: 2019 which includes testing the compressive strength, split tensile strength, porosity, density, water absorption, and ultrasonic pulse velocity (UPV) of concrete with a mixture of 0% (OPC), 35% (FA35C5), 37% (FA37C3), 39% (FA39C1), 40% (FA40), 55% (FA55C5) 57% (FA57C3), 59% (FA59C1) and 60% (FA60) fly ash waste and the addition of CaCO3 by 1%, 3% and 5%. The results showed that the addition of CaCO3 by 1%, 3% and 5% in fly ash variations of 35%, 37%, 39%, 55%, 57%, and 59% affected the mechanical properties of High Volume Fly Ash concrete. As the CaCO3 content increases, the values of compressive strength, split tensile strength, porosity, water absorption, density and UPV test tend to decrease, indicating that the concrete is getting better. Variation FA39C1 with 39% fly ash substitution and 1% CaCO3 showed optimum results with compressive strength, split tensile strength, porosity, water absorption, density and UPV test values of 29.70 Mpa, 2.71 Mpa, 8.42%, 3.50%, 2.69 gr/cm³ and 4571.67 m/s respectively.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kata kunci : HVFA, Fly Ash, Kalsium Karbonat, Porosity, Density Keywords: HVFA, Fly ash, Calcium Carbonate, Porosity, Density
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking.
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Fiki Dwiki Alfariz
Date Deposited:	06 Feb 2025 00:48
Last Modified:	06 Feb 2025 00:48
URI:	http://repository.its.ac.id/id/eprint/118245

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