Pengaruh Penambahan Komposit Iron-Carbon (FeC) Hasil Pirolisis Limbah Plastik Terhadap Performa Mekanik dan Durabilitas Cementitious Composites

Mahmud, Rizki Andika (2026) Pengaruh Penambahan Komposit Iron-Carbon (FeC) Hasil Pirolisis Limbah Plastik Terhadap Performa Mekanik dan Durabilitas Cementitious Composites. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan akan beton dengan performa tinggi, mendorong perkembangan inovasi material, salah satunya melalui penggunaan material nano sebagai aditif. Namun, tingginya biaya dan kompleksitas sintesis, membatasi pengaplikasian inovasi ini pada skala konstruksi. Di sisi lain, peningkatan limbah plastik menuntut solusi yang tidak hanya berfokus pada reduce dan reuse, tetapi juga recycling. Penelitian ini memanfaatkan limbah plastik melalui catalytic pyrolysis untuk menghasilkan material berbasis karbon berupa besi karbida (Fe3C/FeC) yang kemudian diaplikasikan sebagai aditif pada cement composites. Pengaruh FeC terhadap sifat mekanik, durabilitas serta perilaku hidrasi, dievaluasi untuk melihat pengaruhnya melalui pengujian kuat tekan, modulus elastistias, penyerapan air, permeabilitas ion klorida, serta analisis kimia reaksi hidrasi. Hasil menunjukan bahwa penambahan FeC meningkatkan kekuatan tekan hingga 12,390% serta meningkatkan modulus elastistias sebesar 33,830% hanya dengan dosis optimum 0,1 wt.%. Selain itu, terjadi perbaikan durabilitas yang ditunjukan dengan penurunan penyerapan sebesar 20,497%, peningkatan kepadatan 2,317%, serta penurunan porositas sebesar 18,190%. Perbaikan mikrostruktur tersebut juga ditunjukan melalui pengujian RCPT yang lebih rendah serta hasil sorptivity. Hasil yang diperoleh dikonfirmasi melalui pengamatan SEM yang menunjukan adanya mikrostrukur yang lebih rapat pada spesimen yang menggunakan FeC. Analisis fase hidrasi juga menunjukan adanya peningkatan produk hidrasi pada umur awal spesimen yang ditambahkan FeC, yang mengindikasi percepatan reaksi hidrasi. Namun demikian, estimasi carbon footprint menunjukan bahwa penggunaan FeC menghasilkan total emisi karbon 2 kali lebih tinggi, dengan emisi terbesar berasal dari proses sintesis menggunakan electric furnace. Meskipun demikian, temuan penelitian ini menyatakan penggunaan FeC pada cement composites tetap menghasilkan peningkatan performa mekanik dan durabilitas.
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The growing demand for high-performance concrete has driven extensive research into advanced materials modifications, particularly through the incorporation of nanomaterials as functional additives. However, their relatively high cost and complexity of synthesis method limit the application in the construction scale. On the other hand, the increasing production of plastic waste need solutions through not only reduce and reuse, but also recycling. This research utilizes plastic waste through catalytic pyrolysis to produce carbon-based materials in the form of iron carbide (Fe3C/FeC) which is applied as an additive to cement composites. The effect of FeC on the mechanical properties, durability and hydration characteristics evaluated through the tests of compressive strength, elastic modulus, water absorption, permability of ion chloride, also chemical analysis of hydration. Results show that the incorporation of FeC increase the compressive strength by 12.390% and achieved a 33.830% enhancement in elastic modulus at an optimum dossage of just 0.1 wt.%. Furthermore, the improvement of durability properties was reflected by a 20.497% reduction in water absroption and 18.190 decrease in porosity, along with a 2.317% increase in density. Moreover, this microstructural improvement also reflected in lower chloride ion penetration and sorptivity results. These findings were confirmed by SEM observations, which reveald a denser microstructure in the specimens containing FeC. In addition, an increase of hydration products at early age was observed, indicating an acceleration of the hydration process. However, carbon footprint estimates show that the use of FeC results in high total carbon emission 2 times larger, with the largest emissions coming from the synthesis process using an electric furnace. Nevertheless, the mechanical and durability performance was improved using FeC as an additive in cement composites.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Carbon-Based Additives, Cementitious Composites, Durability Performance, Mechanical Properties, Plastic Waste Pyrolysis, Kemampuan Mekanik, Performa Durabilitas
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Rizki Andika Mahmud
Date Deposited:	27 Jul 2026 01:35
Last Modified:	27 Jul 2026 01:35
URI:	http://repository.its.ac.id/id/eprint/138340

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