In this research Concrete mix designs were prepared according to the DOE method and a total of 6 mixes with 72 samples prepared to consist of concrete grade C-25. The test samples were produced with the percentage of substitution for the fine aggregate by 1. 2. 3. https://www.bekindtopets.com/save-big-Raspberry-Pi-Pico-Breadboard-Kit-great-pick/