“…As seen in Figure 5 , the compaction curve changes their peak with the addition of CDW in soil. As the CDW content increased in the soil sample, the optimum moisture content decreased because the non-cohesive CDW powder absorbed less water than natural soil particles and maximum dry density increased because CDW powder has more sands and greater specific gravity than clayey soil ( Abdulnafaa et al., 2021 ). The changes in optimum moisture content and maximum dry density of soil sample due to CDW percentages are shown in Figure 6 .…”