Pengaruh bahan tambah abu sekam padi dan Sika Fume terhadap kuat tekan, kuat tarik belah, dan kuat lentur beton SCC

Abstract

Self-Compacting Concrete (SCC) is concrete that can flow and fill the firmwork under its own weight. Self-compacting concrete cannot flow without the addition of chemical admixture known as superplasticizer. In this research, Viscocrete 3115N superplasticizer was used at 0,9% of the cement weight to enhance workability. Mineral additives such as rice husk ash at 10% of the cement weight and sika fume at levels of 0%, 3%, 5%, 8%, and 10% of the cement weight were also incorporated to increase concrete strength. The mix design calculation of concrete is based on SNI 03-2834-2000 with a planned compressive strength of 41,5 MPa. The testing conducted in this research aimed to determine the influence of using rice husk ash and sika fume in self-compacting concrete on the compressive strength, tensile strength, and flexural strength of 28- day-old concrete. Additionally, self-compacting concrete were tested using slump flow T50, V-Funnel, and L-Box tests. The research results indicate that using a rice husk ash and sika fume can enhance the compressive strength, tensile strength, and flexural strength of selfcompacting concrete. The compressive strength of the concrete can increase up to 19,63%, tensile strength up to 17,65%, and flexural strength up to 9,04% compared to normal concrete. The optimum compressive strength was obtained in the ASP10% - SF5% variation, reaching 44,136 MPa. However, the ASP10% - SF8% and ASP10% - SF10% variations cannot be considered as self-compacting concrete because it does not meet the testing requirements for concrete characteristics according to EFNARC 2005