Pengaruh Substitusi Semen dengan Ground Granulated Blast Furnace Slag (GGBFS) terhadap Workability dan Kuat Tekan Beton Pracetak di PT WIKA Beton Tbk

Abstract

Industri konstruksi saat ini dituntut menghasilkan beton berkinerja tinggi yang lebih ramah lingkungan. Salah satu cara yang dapat dilakukan adalah dengan memanfaatkan Ground Granulated Blast Furnace Slag (GGBFS) sebagai substitusi parsial semen Portland. Penelitian ini bertujuan menganalisis pengaruh kadar GGBFS terhadap workability dan kuat tekan beton pracetak. Variasi kadar GGBFS yang digunakan yaitu 0%, 10%, 15%, dan 20% dari berat semen. Pengujian dilakukan terhadap nilai slump serta kuat tekan beton pada umur 7, 14, dan 28 hari, kemudian dianalisis menggunakan MANOVA pada taraf signifikansi a = 0,05. Hasil penelitian menunjukkan bahwa penambahan GGBFS meningkatkan nilai slump beton dari 5,0 cm menjadi 8,5 cm. Kadar GGBFS berpengaruh signifikan terhadap nilai slump, tetapi tidak berpengaruh signifikan terhadap kuat tekan beton. Kuat tekan optimum diperoleh pada kadar GGBFS 15% sebesar 63,02 MPa pada umur 28 hari. Secara umum, penggunaan GGBFS dapat meningkatkan workability beton tanpa menurunkan kuat tekan secara signifikan.

The construction industry is currently challenged to produce high-performance concrete that is also more environmentally friendly. One possible approach is to utilize Ground Granulated Blast Furnace Slag (GGBFS) as a partial replacement for Portland cement. This study aims to analyze the effect of GGBFS content on the workability and compressive strength of precast concrete. The GGBFS contents used were 0%, 10%, 15%, and 20% of the cement weight. Tests were conducted on slump value and concrete compressive strength at 7, 14, and 28 days, and the data were analyzed using MANOVA at a significance level of a=0.05. The results showed that increasing the GGBFS content increased the concrete slump value from 5.0 cm to 8.5 cm. GGBFS content had a significant effect on slump, but it did not significantly affect concrete compressive strength. The optimum compressive strength was obtained at 15% GGBFS content, reaching 63.02 MPa at 28 days. In general, the use of GGBFS can improve concrete workability without significantly reducing compressive strength.