Beton Hijau Menggunakan Fly ash sebagai Subtitusi Parsial Semen:

Muhammad Ramdhan Olii; Azhar A Wahab; Ilyas  Ichsan; Rahman  Abdul Djau; Sartan Nento

doi:10.31849/siklus.v9i1.11101

Muhammad Ramdhan Olii Universitas Gorontalo
Azhar A Wahab Universitas Gorontalo
Ilyas Ichsan Universitas Gorontalo
Rahman Abdul Djau Universitas Gorontalo
Sartan Nento Universitas Gorontalo

DOI: https://doi.org/10.31849/siklus.v9i1.11101

Keywords: Semen, Fly Ash, Beton Hijau, Kuat Tekan

Abstract

Perkembangan infrastruktur berbanding lurus dengan tingkat kebutuhan akan semen sebagai bahan utama dalam konstruksi bangunan. Industri semen menghasilkan 8-10% dari total emisi CO2 dunia. Penelitian ini bertujuan untuk menemukan alternatif atau penggantian sebagian material beton hijau sehingga meminimalkan dampak lingkungan dari pembuatan beton dan meningkatkan kekuatan beton, salah satunya adalah fly ash. Fly ash dapat digunakan bersama dengan semen portland dalam beton yang berkontribusi terhadap sifat-sifat beton melalui aktivitas hidrolik atau pozzolan, atau keduanya. Hasil pengujian kuat tekan karakteristik beton dengan substitusi parsial semen dengan variasi fly ash (9%, 9.5%, 10%, dan 10.5%) pada umur 28 hari adalah masing-masing 36.70 Mpa, 35.11 Mpa, 33.37 Mpa, dan 30.38 Mpa. Kuat tekan beton meningkat sebesar 5% pada variasi fly ash sebesar 9% dan 9.5% dan menurun sebesar 13% pada variasi fly ash sebesar 10% dan 10.5%. Dari hasil tersebut dapat disimpulkan bahwa semakin besar persentase penggunaan fly ash sebagai subtitusi parsial semen maka semakin menurun kuat tekannya. Jumlah optimum fly ash bervariasi sangat bergantung pada komposisi dan proporsi semua bahan dalam campuran beton (terutama fly ash), kondisi selama penempatan (terutama suhu), praktik konstruksi (misalnya, finishing dan curing) dan kondisi paparan. Dengan demikian, kadar fly ash yang optimal akan bervariasi berdasarkan kasus per kasus.

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