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Performa Beton Dengan Ground Granulated Blast Furnace Slag Terhadap Sulfate Attack
(1) Jurusan Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Malang, Malang.
(2) Jurusan Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Malang, Malang.
(3) Jurusan Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Malang, Malang.
(*) Corresponding Author
DOI: https://doi.org/10.25077/jrs.16.3.185-193.2020
Copyright (c) 2020 Rizki Amalia Tri Cahyani, Ernawan Setyono, Yunan Rusdianto
Abstract
Serangan sulfat (sulfate attack) termasuk hal yang umum terjadi pada struktur beton, mengingat ion sulfat banyak dijumpai pada tanah, air tanah dan air laut. Peningkatan ketahanan beton melawan sulfat akan berdampak besar pada durabilitas dan umur layan struktur beton. Penambahan supplementary cementitious materials seperti GGBFS (ground granulated blast furnace slag) ke campuran beton telah terbukti memberikan pengaruh positif terhadap durabilitas dan properti mekanis beton. Namun, GGBFS tergolong material yang baru dikembangkan di Indonesia dan potensinya dalam meningkatkan durabilitas beton belum dimanfaatkan secara luas. Berdasarkan hal tersebut, perlu dilakukan investigasi terkait aplikasi GGBFS dan pengaruhnya terhadap durabilitas beton, terutama dalam melawan serangan sulfat. Dalam studi ini, durabilitas beton dengan persentase penggantian GGBFS 30%, 50% dan 70% terhadap total volume binder dievaluasi menggunakan perlakuan siklus basah-kering dalam larutan magnesium sulfat. Tingkat degradasi beton diukur dengan melakukan observasi terhadap perubahan kuat tekan dan massa spesimen akibat serangan sulfat. Hasil penelitian menunjukkan bahwa penggantian GGBFS hingga 50% dari total volume binder dapat meningkatkan ketahanan beton terhadap serangan sulfat, ditunjukkan dengan kehilangan massa dan reduksi kekuatan yang lebih rendah dibandingkan spesimen kontrol dengan 100% semen Portland.
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