Utilization of zeolite materials with physical activation and chemical activation as cement substitutes

Concrete is still used as the main material in construction for development in Indonesia. This can be caused by the fact that concrete is affordable and durable. Increasing demand for concrete leads to more updates on concrete testing. In recent years, the use of waste products in civil construction has increased in line with global issues regarding waste utilization. Given the large number of zeolites found in the environment, it is necessary to develop technology for the use of zeolite to make it more economical and environmentally friendly. This study aims to determine the effect of using zeolite material with physical and chemical activation as a substitute for cement on the compressive strength of concrete and the resulting volume weight. Physical activation is done by heating the zeolite at a temperature of 250֯ C for 3 hours, chemical activation is done by dissolving the zeolite with a NaOH solution and then drying it in an oven, then the concrete is printed on a cylindrical mold with a diameter of 15 cm and a height of 30 cm. There will be 21 specimens of zeolite for physical activation and chemical activation, and the compressive strength test is performed when the concrete is 28 days old. The best test result for both partial replacement of cement by zeolite with physical activation and chemical activation is at the variation of 10%. Partial replacement by zeolite with physical activation at the variation of 10% shows a decrease in compressive strength of 0.377%. As for partial replacement by zeolite with chemical activation at the variation of 10%, it shows an increase in compressive strength of 4.2%. Based on the result, the use of zeolite material with chemical activation is better because it shows higher compressive strength than the one that uses physical activation.