Research on the Characteristic of Coarse Aggregate After Particle Shaping and the Influence on the Concrete Performance

Abstract:

By using small ball mill as the shaping source, the change of basic characteristics of coarse aggregate after particle shaping was studied and correlation analysis was conducted between the aggregate characteristics and its application performance. The results show that according to the change of the coarse aggregate particles, the shaping process is divided into three stages: transformation stage of elongated and flaky particles, roundness improve stage and particle crushing stage. Appropriate particle shaping process can make the aggregate use in the concrete to increase significantly the flowability of concrete and not to reduce the strength, but excessive shaping will be harmful to the flowability and strength. In the early stage of the particle shaping, packing density increasing caused by needle flake transformation is the key parameters affecting the concrete flowability. In the latter particle shaping process, roundness of coarse aggregate is the main factors influencing the concrete flowability. As a comprehensive parameter to evaluate the friction between the coarse aggregate particles, angle of repose of aggregate particles has high correlation with the flowability of concrete.

Key words:coarse aggregate; particle shaping; packing density; roundness; angle of repose