Effect of Physical Excitation on the Properties of Recycled Fine Powder

Using the ball mill to grind the recycled fine powder at different times to study the effect of physical excitation on the properties of the recycled fine powder. The results show that the use of physical excitation can make the particle size of the recycled fine powder continuously decrease, and the particle size distribution tends to be reasonable. With the prolongation of the grinding time, the particle content of <20µm increases continuously, especially the content of particles with <4µm increases greatly. The mortars reclaimed with 30 minutes of grinding time have the strongest compressive strength and flexural strength at various ages at various substitution rates, indicating that the effective physical excitation of recycled fine powders can improve their activity.