In this study, we prepared reactive powder concrete (RPC) specimens with diatomite replacement levels of 0%, 5%, 10%, 15%, and 20% by weight of cement using pan mixer. The fresh properties were evaluated through flow tests, and the hardened properties were determined by conducting compressive strength and tensile strength tests. The density of hardened specimens was measured and compared with conventional RPC. An optimum replacement level was identified based on the reduction in density and the retention of adequate mechanical performance. In addition, steel fibers were replaced with basalt fibers to evaluate their influence on the mechanical behavior of RPC. The results showed that the incorporation of diatomite powder reduced the density due to its porous structure, while maintaining satisfactory strength at replacement level of 10%. The use of basalt fibers improved the crack resistance and overall performance of the modified RPC. The study demonstrates that diatomite powder can be effectively used to produce low-density reactive powder concrete with acceptable mechanical properties.
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