Analisis Pengaruh Variasi Ketebalan Coating Epoxy Terhadap Kekuatan Adhesi, Sifat Hidrofobik, Dan Ketahanan Pembersihan Pada Beton Laut

Alwy, Azmi Qaedani (2026) Analisis Pengaruh Variasi Ketebalan Coating Epoxy Terhadap Kekuatan Adhesi, Sifat Hidrofobik, Dan Ketahanan Pembersihan Pada Beton Laut. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Struktur beton yang beroperasi di lingkungan laut rentan mengalami degradasi akibat penetrasi air laut, ion klorida, dan zat agresif lainnya yang dapat mempercepat kerusakan beton serta korosi tulangan. Salah satu upaya untuk meningkatkan durabilitas beton adalah melalui aplikasi epoxy coating sebagai lapisan pelindung (barrier coating) yang mampu menghambat masuknya air dan zat agresif ke dalam pori-pori beton. Penelitian ini bertujuan untuk menganalisis pengaruh variasi ketebalan epoxy coating terhadap kekuatan adhesi, sifat hidrofobik, dan ketahanan penyerapan air pada beton laut. Penelitian dilakukan secara eksperimental menggunakan spesimen beton kubus berukuran 10 × 10 × 10 cm yang terdiri atas beton tanpa coating, epoxy coating 2 lapis, dan epoxy coating 3 lapis. Evaluasi dilakukan melalui Pull-Off Adhesion Test berdasarkan ASTM D4541 untuk mengetahui kekuatan adhesi, Contact Angle Test untuk mengevaluasi sifat hidrofobik permukaan, dan Water Absorption Test untuk menilai kemampuan coating dalam menghambat penyerapan air. Hasil penelitian menunjukkan bahwa variasi 3 layers epoxy coating memberikan performa terbaik pada seluruh parameter pengujian. Nilai rata-rata kekuatan adhesi meningkat dari 2,332 MPa pada 2 layers menjadi 2,442 MPa pada 3 layers. Hasil Contact Angle Test juga mengalami peningkatan dari 63,10° dan 51,55° pada beton tanpa coating menjadi 79,29° dan 73,07° pada 2 layers, serta 84,64° dan 79,53° pada 3 layers, yang menunjukkan peningkatan sifat hidrofobik permukaan meskipun seluruh spesimen masih tergolong hidrofilik (contact angle < 90°). Selain itu, hasil Water Absorption Test menunjukkan bahwa kenaikan berat spesimen setelah perendaman menurun dari 0,226 kg pada beton tanpa coating menjadi 0,063 kg pada 2 layers dan 0,034 kg pada 3 layers, sehingga membuktikan bahwa semakin tebal lapisan epoxy coating, semakin baik kemampuannya dalam menghambat penyerapan air ke dalam beton. Berdasarkan hasil tersebut, dapat disimpulkan bahwa peningkatan ketebalan epoxy coating mampu meningkatkan daya lekat, memperbaiki sifat hidrofobik, dan mengurangi penyerapan air, sehingga berpotensi meningkatkan durabilitas serta memperlambat degradasi struktur beton yang beroperasi di lingkungan laut.
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Concrete structures operating in marine environments are susceptible to degradation due to seawater penetration, chloride ions, and other aggressive substances that accelerate concrete deterioration and reinforcement corrosion. One effective approach to improving concrete durability is the application of epoxy coating as a protective barrier that limits the ingress of water and aggressive agents into concrete pores. This study aimed to investigate the effect of epoxy coating thickness variation on adhesion strength, surface hydrophobicity, and water absorption resistance of marine concrete. An experimental study was conducted using 10 × 10 × 10 cm concrete cube specimens consisting of uncoated concrete, 2-layer epoxy coating, and 3-layer epoxy coating. The coating performance was evaluated through the Pull-Off Adhesion Test based on ASTM D4541, the Contact Angle Test, and the Water Absorption Test. The results indicated that the 3-layer epoxy coating exhibited the best overall performance. The average adhesion strength increased from 2.332 MPa for the 2-layer coating to 2.442 MPa for the 3-layer coating. The Contact Angle Test results also increased from 63.10° and 51.55° for uncoated concrete to 79.29° and 73.07° for the 2-layer coating, and further to 84.64° and 79.53° for the 3-layer coating, indicating an improvement in surface hydrophobicity, although all specimens remained within the hydrophilic category (contact angle < 90°). Furthermore, the Water Absorption Test showed that the specimen weight gain after immersion decreased from 0.226 kg for uncoated concrete to 0.063 kg for the 2-layer coating and 0.034 kg for the 3-layer coating, demonstrating that increasing the coating thickness effectively reduced water penetration into the concrete. Therefore, increasing the thickness of the epoxy coating improves adhesion strength, enhances surface hydrophobicity, and reduces water absorption, thereby increasing the durability of concrete structures and helping to mitigate degradation in marine environments.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Beton Laut, Coating Epoxy, Ketebalan Coating Marine Concrete, Epoxy Coating, Coating Thickness
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 Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Azmi Qaedani Alwy
Date Deposited:	20 Jul 2026 07:00
Last Modified:	20 Jul 2026 07:00
URI:	http://repository.its.ac.id/id/eprint/135756

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