Effect of Nano-Calcium Carbonate on Lightweight Concrete Properties and Printability of Mortar of 3D Printing Application

Abstract

Strength, chemical composition, and microstructure. In terms of 3D printing tested by flow test and open time. The results show that the unit weight and flexural strength increased with an increase in nano-calcium carbonate content. However, the slump and setting time were found to decrease with an increasing amount of nano-calcium carbonate. In the case of compressive strength, it increased with the increasing calcium carbonate content up to about 2% and then decreased. The water permeability also decreased with the increasing nano-calcium carbonate content up to about 2.5%, then increased. It was confirmed that the increase of nano-calcium carbonate content by XRD and the void filling by SEM were observed. In terms of 3D printing, the initial printable time and width of the printed filament decreased with an increase in the increasing nano-calcium carbonate content.