EVALUASI KEKUATAN BETON MUTU TINGGI DENGAN MENGGUNAKAN KOMBINASI FLY ASH DAN SILICA FUME SEBAGAI SUBTITUSI SEMEN
DOI:
https://doi.org/10.32497/orbith.v20i3.6257Keywords:
High-Strength Concrete, Fly Ash, Silica Fume, Cement SubstitutionAbstract
Abstrak Beton mutu tinggi merupakan material penting dalam konstruksi modern karena kekuatannya yang unggul dan daya tahannya yang tinggi. Salah satu cara untuk meningkatkan performa beton adalah dengan menggunakan bahan substitusi seperti fly ash dan silica fume sebagai pengganti sebagian semen. Fly ash dan silica fume , yang merupakan produk sampingan industri, telah terbukti meningkatkan kekuatan tekan, daya tahan, dan sifat-sifat mekanis beton. Penelitian ini bertujuan untuk mengevaluasi kekuatan beton mutu tinggi dengan kombinasi fly ash dan silica fume sebagai substitusi semen dalam persentase yang berbeda-beda dengan variasi 1 dengan Fly Ash 5% dan Sicafume 2%, variasi 2 dengan Fly Ash 15% dan Sicafume 6%, variasi 3 dengan Fly Ash 20% dan Sicafume 8%. Hasil penelitian menunjukkan bahwa kuat tekan umur 28 hari menunjukkan variasi 3 mencapai kuat tekan tertinggi 67,93 MPa atau meningkat 60% dari rancangan awal (42 MPa) , diikuti oleh Variasi 2 sebesar 63,03 MPa meningkat 40,1% dan Variasi 1 sebesar 45,85 MPa meningkat 8,6%. Hasil ini memberikan wawasan penting untuk pengembangan beton mutu tinggi yang lebih ramah lingkungan dan efisien dalam biaya konstruksi. Penelitian ini diakhiri dengan kesimpulan bahwa kombinasi fly ash dan silica fume merupakan pilihan yang optimal untuk meningkatkan kekuatan dan daya tahan beton, dengan saran untuk implementasi lebih luas dalam proyek infrastruktur. Kata kunci: Beton Mutu Tinggi, Fly Ash, Silica Fume, Substitusi Semen. Abstract High-strength concrete is a critical material in modern construction due to its superior strength and durability. One method to enhance concrete performance is by using supplementary materials such as fly ash and silica fume as partial replacements for cement. Fly ash and silica fume, which are industrial by-products, have been proven to improve the compressive strength, durability, and mechanical properties of concrete. This study aims to evaluate the strength of high-strength concrete with a combination of fly ash and silica fume as cement substitutes in varying percentages: Variation 1 with 5% fly ash and 2% silica fume, Variation 2 with 15% fly ash and 6% silica fume, and Variation 3 with 20% fly ash and 8% silica fume. The results show that the 28-day compressive strength of Variation 3 achieved the highest strength at 67.93 MPa, representing a 60% increase from the initial design (42 MPa), followed by Variation 2 at 63.03 MPa (a 40.1% increase), and Variation 1 at 45.85 MPa (an 8.6% increase). These findings provide valuable insights for the development of more environmentally friendly and cost-efficient high-strength concrete. The study concludes that the combination of fly ash and silica fume is an optimal choice for improving concrete strength and durability, with recommendations for broader implementation in infrastructure projects. Keywords: High-Strength Concrete, Fly Ash, Silica Fume, Cement SubstitutionReferences
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