Experimental investigation on the mechanical and Theological properties of high-performance concrete (HPC) incorporating sinking bead

摘要

In this paper, the effects of a type of sinking bead, which is separated from fly ash, on the rheology and hardened performance of High-Performance concrete (HPC) are investigated. Based on the modified Andreasen & Andersen particle packing model, the sinking bead was added by partly replacing the port-land cement to achieve the designed HPC. The rheology, mechanical properties, and microstructure of the developed HPC are thoroughly investigated through a serious of experiments. It is discovered that the smaller particle sized sinking bead can act as "ball-bearings" which can overcome the interval friction, so the fresh sinking bead HPC paste possesses better thixotropic property, shear thinning rheology behaviour, lower yield stress, and plastic viscosity than the fly ash based HPC paste under the same dosage. Moreover, the experimental results have demonstrated that the sinking bead based HPC have excellent electrical resistivity, compressive strength, flexural strength, and microstructure at the hardened state. In addition, it is discovered that the sinking bead based HPC shares very similar microscopic product and micro-morphology to the fly ash based HPC. (C) 2020 Elsevier Ltd. All rights reserved.