SIFAT MEKANIK KEKUATAN BETON MENGGUNAKAN LIMBAH ABU BATUBARA (POND ASH) SEBAGAI PENGGANTI AGREGAT HALUS

Tumingan Tumingan

Abstract


Penangangan limbah pembakaran batubara pada pembangkit listrik tenaga uap di Lati kabupaten Berau yang direkomendasikan badan pengelola dampak lingkungan Provinsi Kalimantan Timur adalah dengan cara membuang abu batubara ke dalam kolam-kolam yang dialiri air agar abu batubara tidak terbang yang menimbulkan polusi udara. Endapan atau kumpulan abu batubara dalam kolam pengendap dinamakan Pond Ash. Penelitian ini memanfaatkan pond ash untuk campuran beton, dengan menguji pengaruh penggunaan pond ash sebagai pengganti sebagian agregat halus optimum dalam campuran beton, diteliti menggunakan spesimen berbentuk silinder diameter 100 mm dan tinggi 200 mm. Spesimen dibuat dengan mengambil perbandingan prosentase pond ash sebesar 0%: 5%: 10%: 15% dan 20% terhadap campuran beton dengan faktor air semen konstan 0,49 berdasarkan hasil rancangan campuran beton normal f’c 25 MPa. Pengujian beton keras dilakukan terhadap kuat tekan, kuat tarik belah dan porositas dalam campuran beton. Hasil pengujian menetapkan kadar optimum agregat pond ash dalam campuran beton diperoleh komposisi pond ash optimum 17,5% pada pengujian kuat tekan dan kuat tarik belah beton. Maka komposisi optimum untuk bahan campuran pasir 20,0% : pond ash 17,5% : batu pecah 62,5%. Hasil pengujian kuat tekan 25,05 MPa untuk beton normal dan 27,06 MPa untuk beton pond ash optimum, terjadi peningkatan sebesar 8,05% terhadap beton normal. Hasil pengujian kuat tarik belah beton diperoleh hasil 2,459 MPa untuk beton normal dan 2,659 MPa untuk beton pond ash optimum, terjadi peningkatan sebesar 8,15% terhadap beton normal. Hasil pengujian porositas diperoleh hasil 4,43% porositas beton normal dan menurun berbanding kadar pond ash nya yakni masing-masing 4,22%; 3,79%; 3,37% dan 3,17% dengan pola non linier.

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