The packing effect is determined by difference in compressive strength of cement pastes containing
different particle sizes of ground river sand cement paste. Percentage compressive strengths of cement
pastes due to packing effect are shown in Figure 2. The percentage compressive strengths due to packing
effect 10POA, 20POA, 30POA and 40POA cement paste were 4%, 4%, 5% and 5% of the OPC cementpaste, respectively. From the results, the high fineness of the particles obtained on the compressive strength
of cement paste.