Abstract
In this paper, we investigated the effect of aggregate size on the yield stress of mortar. Eight sizes of mono-disperse spherical glass beads were selected as aggregates. Our results indicated that the size of aggregate has little effect on the yield stress of mortar. And then, we discussed and analyzed the results from the perspectives of excess paste theory, strain-shear mechanism and hydrodynamic and showed that the yield stress of the mortar is not only related to the paste film thickness (PFT) but also to the size of aggregate (D). Finally, we believed that there is a good correlation between the yield stress and the ratio of D to PFT (D/PFT) of mortar. The D/PFT may be suitable as a macroscopic parameter to characterize the yield stress of mortar/concrete.
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