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Title: Influence of Alkali Free Accelerators on the Early Age Properties of 3D Printable Concrete

Author(s): Santhanam

Publication: Web Session

Volume: ws_S22_Santhanam.pdf

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 3/28/2022

Abstract:
Alkali free accelerators initiate the formation of ettringite in concrete in a rapid fashion, which leads to a stiffening - without complete setting - of the printed layers soon after placement, thus increasing the buildability of the 3D printed concrete. It is essential to understand the method of addition of the accelerator - either within the concrete mixture, or at the nozzle - to provide the best means of improving the buildability. The paper explores various experimental techniques for the evaluation of the effectiveness of the alkali-free accelerators in 3D printed concrete mixtures. A primary emphasis is placed on the use of the squeeze flow test for evaluation of the early age structural build up that results with the use of such admixtures.