Effect of Nanostructured Silica Additives on the Extrusion-Based 3D Concrete Printing Application

Recently, 3D printing technology has become more popular in the field of construction. For extrusion-based concrete (3DCP) process, cementitious material needs to be strong and flowable enough ensure buildability pumpability. Nanostructured silica, a kind additive, been used modify 3DCP meet these requests. However, most previous studies focused on effect nanostructured silica rheological properties failed link obtained nanostructured-silica-modified materials performance printing. In this paper, mixture based premix cement, river sand, fume, water was modified by different dosages (from 0.25% 1.00% total weight mixture). The effects rheological, hydration, printing, microstructural were determined tests, stress growth setting time scanning electron microscopy (SEM) respectively. This paper revealed that positive but negatively affects quality, which fits properties. Hence, can qualitatively evaluate materials.