Chiang Mai Journal of Science

     This research investigates the physical properties of small interlocking blocks made from Type 1 Portland cement (OPC), ground chicken eggshell waste (EC), and ground duck eggshell waste (ED). Various mixing ratios of OPC:EC and OPC:ED at 1:3, 1:4, and 1:5 based on the weight of the binder material were employed to assess general characteristics, including weight, water absorption, density, and compressive strength of the interlocking blocks. The findings reveal that the 1:3 mixing ratio (OPC:EC and OPC:ED) is the most effective compared to other ratios. An increase in the amounts of EC and ED generally leads to higher water absorption in the blocks. Specifically, the water absorption of blocks containing EC is lower than that of those made with ED. Additionally, the density of the blocks decreases as the proportion of both types of eggshell increases, with blocks made from EC exhibiting a higher density than those made from ED. Furthermore, the test results indicate that the compressive strength of blocks mixed with EC surpasses that of blocks mixed with ED.