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ALTIE SANTIKA ARIFIN
PT Dian Widya Enjiniring
Civil Engineering, Building, Construction & Architecture Computer Science & IT

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STUDI EKSPERIMENTAL KUAT TARIK LENTUR BETON GEOPOLIMER DENGAN SUBSTITUSI PARSIAL LIMBAH KARBIT MUHAMMAD DAFFA FACHREZI; Erma Desimaliana; ALTIE SANTIKA ARIFIN
Surya Teknika Vol. 3 No. 3 (2026): Jurnal Surya Teknika Volume 3 Nomor 1 2026
Publisher : Fakultas Teknik Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31934/jst.v3i3.11974

Abstract

Beton geopolimer berbasis limbah industri berpotensi mengurangi ketergantungan terhadap semen Portland, tetapi kapasitas tarik lenturnya harus dipastikan karena retak awal pada elemen balok berkembang dari zona tarik. Penelitian ini mengevaluasi kuat tarik lentur beton geopolimer dengan prekursor 50% fly ash kelas F dan 50% limbah karbit. Proporsi agregat:binder adalah 60%:40%, prekursor:alkali aktivator 70%:30%, NaOH 10 M, dan rasio Na₂SiO₃:NaOH 1:1. Tiga balok 150 mm × 150 mm × 600 mm dirawat dengan metode membran dan diuji pada umur 28 hari. Kuat tekan pada umur 28 hari sebesar 23,67 MPa digunakan secara terbatas sebagai parameter pendamping untuk mengevaluasi persamaan empiris kuat tarik lentur. Hasil pengujian balok mencapai 2,40–2,67 MPa dengan rata-rata 2,53 MPa, simpangan baku 0,14 MPa, dan koefisien variasi 5,33%. Persamaan SNI 2847:2019, 0,62√f′c, memprediksi 3,02 MPa atau 19,07% lebih tinggi daripada hasil eksperimen. Koefisien berbasis dataset yang diperoleh adalah 0,521√f′c. Retak berkembang relatif vertikal dari serat tarik bawah dan menunjukkan keruntuhan dominan lentur. Hasil ini merupakan benchmark kelayakan awal campuran, bukan bukti kausal peningkatan akibat limbah karbit karena tidak tersedia campuran kontrol.
Sifat Mekanik Beton Geopolimer Akibat Pengaruh Substitusi Parsial Calcium Carbide Residue (CCR) Erma Desimaliana; Muhammad Daffa Fahrezi; Altie Santika Arifin
Jurnal Proyek Teknik Sipil Vol 9, No 2 (2026): September
Publisher : Civil Infrastructure Engineering and Architectural Design

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/potensi.2026.33718

Abstract

The utilization of calcium carbide residue as a calcium-rich secondary binder offers a route to improve industrial-waste valorization in fly-ash geopolymer concrete. This study evaluates the fresh and mechanical performance of geopolymer concrete containing a 50:50 mass proportion of low-calcium fly ash and calcium carbide residue in the precursor fraction. The aggregate-to-binder ratio was 60:40, the precursor-to-alkaline-activator ratio was 70:30, and sodium hydroxide and sodium silicate were used at a 1:1 ratio. Cylindrical specimens (100 mm × 200 mm) were tested in compression at 7, 14, and 28 days, while splitting tensile strength was measured at 28 days. The mixture produced a slump-flow diameter of 555 mm, indicating high flowability despite its visually cohesive and sticky consistency. Average compressive strengths reached 13.81, 17.53, and 23.67 MPa at 7, 14, and 28 days, respectively, corresponding to a 71.4% increase from 7 to 28 days. The 28-day splitting tensile strength was 2.54 MPa, equivalent to 10.7% of the compressive strength. Compressive failure was dominated by longitudinal splitting with localized end spalling, whereas the splitting test produced a nearly straight diametral crack without massive aggregate loss. The findings demonstrate that a high-volume carbide-residue/fly-ash binder can develop structural-grade compressive strength under the adopted activation system.
Co-Authors Erma Desimaliana Erma Desimaliana MUHAMMAD DAFFA FACHREZI Muhammad Daffa Fahrezi