A STUDY ON THE FLUIDITY OF MORTAR WITH FINE AGGREGATE ADJUSTED GRAIN-SIZE AND POWDERS

Abstract

It has been clarified that the particle shape and particle size distribution of fine aggregate have influenced the fresh properties of concrete and mortar in the past research. But it has not been sufficiently studied how each particle size and particle size distribution of fine aggregate affects the fresh properties of mortar and concrete. In this study, we adjusted the particle size of fine aggregate, and evaluated fresh properties of mortar by indicators. We investigated the fluidity of mortar, which changed depending on the composition of particle size distribution. In addition, the behavior of fresh properties of mortar contained powder substituted as part of cement and fine aggregate adjusted particle size distribution was compared with that when no powder was mixed. Its behavior was discussed. It became clear that, the factor influencing the fluidity varied depending on the composition of particle size distribution. The influence of fine particles on fluidity of mortar varied depending on the content of fine particle and the particles size distribution. When combined with the large particles, the fluidity was improved as compared with the combination with the intermediate particles. In addition, the same tendency as in powder-free mixing was confirmed at powder mixing and increase rate of the relative flow area ratio when fly ash was contained became larger than when the limestone fine powder was contained.