PENGARUH RASIO AGREGAT/BINDER DENGAN PENAMBAHAN EARLY STRENGTH AGENT TERHADAP KUAT TEKAN BETON GEOPOLIMER

Abstract

Geopolymer concrete is an innovative alternative to conventional concrete that supports sustainable and environmentally friendly construction. This study aims to determine the effect of varying aggregate-to-binder ratios (65:35, 70:30, and 75:25) with the addition of Triethanolamine (TEA) as an early strength agent (0%, 0.2%, and 0.4%) on the compressive strength of fly ash-based geopolymer concrete. Compressive strength tests were conducted at 1, 7, and 28 days of age. The results show that both the aggregate-to-binder ratio and the TEA dosage significantly affect compressive strength. The optimal compressive strength at aged 1 day was obtained at a 65:35 aggregate-to-binder ratio with 0.4% TEA addition:23,59 MPa. The use of TEA effectively accelerated the geopolymerization process and enhanced early-age strength. This research demonstrates that a proper ratio combination and the inclusion of early strength agents can improve the mechanical performance of geopolymer concrete, making it a promising alternative for sustainable construction.