Improving printability of limestone-calcined clay-based cementitious materials by using viscosity-modifying admixture

In 3D concrete printing (3DCP), it is necessary to meet contradicting rheological requirements: high fluidity during pumping and extrusion, and high stability and viscosity at rest to build the layered structure. In this paper, the impact of the hydroxypropyl methylcellulose (HPMC)-based viscosity-modifying admixture (VMA) on the 3D printability...

Effect of different grade levels of calcined clays on fresh and hardened properties of ternary-blended cementitious materials for 3D printing

This study aims to investigate the influences of different grades of calcined clay on 3D printability, compressive strength (7 days), and hydration of limestone and calcined clay-based cementitious materials. Calcined clays that contained various amounts of metakaolin were achieved by blending low-grade calcined clay (LGCC) and high-grade...

Investigation of limestone-calcined clay-based cementitious materials for sustainable 3d concrete printing

Extrusion-based 3D concrete printing (3DCP), as one of the emerging techniques, has received considerable attention from both academia and industry, due to its numerous benefits for concrete construction, through enhancing the freedom of architectural design, eliminating formwork, optimizing material use, and decreasing wastes, labors and costs....

Pre-treatment and utilization of recycled fine glass dust for 3D Concrete Printing

The first part of this thesis investigated different pre-treatment methods of the fine glass dust in order to increase the reactivity when it was used as a cement replacement in cementitious mixtures. The results showed that the optimal pre-treatment for the fine glass dust was a heat-treatment at 600∘C for 1 hour combined with a grinding...

An approach to develop set-on-demand 3D printable limestone-calcined clay-based cementitious materials using calcium nitrate

The implementation of extrusion-based 3D concrete printing (3DCP) in large-scale constructions is currently limited by concerns regarding rheology control and the sustainability of this process. To address these issues, this study presents an approach to develop limestone-calcined clay-based cementitious (LC3) materials accelerated by Ca(NO...