Rheology and 3D printability of concretes

Abstract

Rheology characteristics of frech concrete include plastic viscosity, static yield stress and dynamic yield stres. Regarding to 3D printing, the fresh
concrete needs both low plasitc viscosity and high enough yield stress for buildability. This paper presents results of the rheology characteristics and printability of fresh concretes. The rheology properties were measured by ICAR Plus rheometer. Results showed that silicafume made the rheological properties of the fresh concrete increase significantly, whereas, an increasing of superplasticizer reduced both viscosity and yield stress of the fresh concrete. Moreover, the fresh concretes were 3D printed suscessfully with static yield stress in range of 260 to 1100 Pa and dynamic yield stress from 150 to 700 Pa.

Key words: Concrete; rheology; 3D printability