Analisis Durabilitas Beton Yang Mengandung Spent Bleaching Earth dan Cangkang Kerang Sebagai Pengganti Semen Dalam Lingkungan Agresif

The palm oil industry produces significant Spent Bleaching Earth (SBE) waste. Simultaneously, shell waste has the potential to be used as a cement substitute. The high CO2 emissions from conventional cement production exacerbate global sustainability issues. This situation creates a pressing need to find eco-friendly and sustainable construction material solutions. This research aims to utilize both SBE and shells as a partial substitute for Portland cement, with a composition of 60% shells and 40% SBE, totaling 10% of the cement's weight. The goal is to reduce the environmental impact of waste and cement production while simultaneously improving the durability and performance of concrete, especially in aggressive and challenging aquatic environments. The test results show that the substitution concrete (CKSBE-AL) immersed in seawater has superior durability. Its compressive strength increased steadily from 18.12 MPa at 7 days to 23.52 MPa at 56 days. This performance far surpasses normal concrete (BN-AL), which saw a drastic strength decrease of 29.35% from 28 to 56 days. Furthermore, water erosion tests proved that CKSBE concrete is more resistant to abrasion, with an erosion area of 0.0282 cm2 compared to normal concrete's 0.0375 cm2. It is concluded that this SBE and shell substitution is highly effective in enhancing concrete's resistance and performance, making it a promising and sustainable construction material solution, especially in aggressive environments.