Analisis Kuat Tekan Dan Kuat Lentur Beton Menggunakan Agregat Campuran Dan Bahan Tambah Sika ViscoCrete-3115 N Berdasarkan Perubahan Berat Isi Beton

The utilization of recycled aggregates in concrete serves as a solution to reduce the use of natural aggregates and minimize the environmental impact of the construction industry. However, the physical properties of recycled aggregates, which have a low specific weight and high waterabsorption, can significantly decrease the quality of concrete. This study aims to analyze the effect of using coarse recycled aggregates and the additive Sika ViscoCrete-3115 N on the compressive strength, flexural strength, and specific weight of concrete. The research was conducted experimentally in the laboratory using a comparative analysis method with concrete of quality f'c 20 MPa. Three mixture variations were used: normal concrete, concrete with 20% recycled aggregates, and concrete with recycled aggregates plus Sika ViscoCrete-3115 N as a superplasticizer. All specimens were immersed in seawater to evaluate durability up to 56 days, with periodic testing at 7, 28, and 56 days. The results showed that the highest compressive strength of 37.8 MPa was achieved in concrete with recycled aggregates and Sika ViscoCrete3115 N at 56 days, exceeding the target quality. However, the flexural strength experienced a decrease due to excessive workability, which caused segregation and bleeding (the release of mixing water) from the mold. The study indicates that Sika ViscoCrete-3115 N effectively enhances the compressive strength of recycled aggregates but requires optimal workability control to maintain flexural strength and mixture homogeneity.