Analisa Mekanik Beton Mutu Tinggi yang Mengandung Diatomaceous Earth sebagai Substitusi Parsial Semen

Abstract

Excessive cement production and environmental damage are major issues that continue to seek solutions. Research has been conducted on various types of materials to find a substitute for cement, including Diatomaceous Earth, which is an organic powdery material formed from the accumulation of dead green algae plants and contains a high SiO₂ content. The Diatomaceous Earth used in this research contains 93.1% SiO₂ and is applied to high-strength concrete. An experimental research method was used by substituting cement with Diatomaceous Earth in variations of 0%, 3%, 6%, 9%, 12%, and 15% of the cement weight. Curing was conducted for 28 days, followed by tests for compressive strength, splitting tensile strength, absorption, and porosity. The results showed that concrete strength decreased with increasing substitution. In contrast, absorption and porosity values increased. The highest compressive strength occurred at TSDE0 with 49.73 MPa, followed by TSDE3 at 44.73 MPa, a decrease of 10%. The highest splitting tensile strength occurred at TSDE0 with 4.69 MPa, followed by TSDE9 with a strength of 4.25 MPa, a decrease of 9%. The lowest absorption occurred at TSDE0 with 0.61%, followed by TSDE6 at 0.94%, an increase of 35%. The lowest porosity occurred at TSDE0 with 2.27%, followed by TSDE3 at 2.42%, an increase of 6.2%