STUDI EKPERIMENTAL KUAT TEKAN BETON f’c 25 MPa DENGAN VARIASI BESTMITTLE

Abstract

In modern practice, additives are often added to improve concrete performance in terms of accident prevention, hardening time, and compressive strength. Additives or supplementary materials used in concrete, such as Bestmittle®, function as superplasticisers or water-reducing agents, which can reduce the water requirement in concrete mixtures without compromising workability. The objective of this study is to determine the compressive strength test values of concrete produced with additives at 14 days of age, the effect of varying Bestmittle addition on the compressive strength of concrete with a strength class of f’c 25 MPa, and the optimal percentage of Bestmittle addition that yields maximum compressive strength in the concrete mixture. This study employed an experimental method with testing conducted at the Materials Laboratory of the Study Department Politeknik Negeri Bali. The independent variable used was the percentage reduction in water usage for the mix design, and the dependent variables were the Bestmittle additive percentages used, which were 0.3%, 0.4%, and 0.6%. The results of this study show that the average compressive strength of concrete with a 0.3% Bestmittle content is 25.92 MPa, with a 0.4% Bestmittle content is 29.75 MPa, and with a 0.6% Bestmittle content is 27.99 MPa. The addition of additives can increase the compressive strength of concrete, especially in the early stages (3 days). This research also plays a role in supporting the application of chemical additive innovations in the Indonesian construction industry to be more targeted and have a tangible impact on the quality of construction outcomes. Additionally, the addition of 0.4% Bestmittle additive to the concrete mixture can have a significant effect, resulting in a 19% increase in the planned compressive strength value.