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Title: How Aggregate Shape and Mortar Rheology Govern Aggregate Settling

Author(s): Weishuo Yan, Wei Cui, and Lan Qi

Publication: Materials Journal

Volume: 119

Issue: 2

Appears on pages(s): 221-230

Keywords: aggregate settling; aggregate shape characteristics; fluid-solid coupling method; mortar rheological properties; self-consolidating concrete (SCC) segregation

DOI: 10.14359/51734358

Date: 3/1/2022

Abstract:
In this paper, a fluid-solid coupling method is used to simulate the aggregate settling in mortar, and the accuracy of this method is verified by comparing the simulation results with experimental results. To evaluate the effects of aggregate shape characteristics and mortar rheological properties on aggregate settling, the authors simulate the settling processes of different aggregates in various mortars. The results show that the shape and orientation of aggregates have a greater influence than aggregate surface properties on settling. The effect of the mortar yield stress is greater than that of mortar plastic viscosity on the aggregate stable state. Considering the interactions between aggregates, the self-consolidating concrete (SCC) segregation process is simulated to observe the motion and distribution of aggregates and analyze the mechanical mechanisms between aggregates.


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