Developments in Portland cement/GGBS binders for 3D printing applications: Material calibration and structural testing

• DOI: 10.1016/j.conbuildmat.2023.133561
• Publication Date: 2023-10-03T07:37:59Z
• Authors: B. Suryanto; J. Higgins; M.W. Aitken; A. Tambusay; P. Suprobo
• Keywords: Cementitious; Shrinkage

The work presented in this paper forms part of a wider research programme being undertaken on the development low-carbon cementitious mortars for 3D printing applications. Specifically, investigates potential ground granulated blast-furnace slag (GGBS) as partial replacement Portland cement. Five mortar mixes with varying water/binder (w/b) ratios (0.35 to 0.45) were tested, and investigate their pumpability buildability, series wall-like specimens printed using custom-built printer under range speeds 2 4 m/min. Pumpability was found be directly related w/b ratio, whereas buildability dependent upon both test parameters. Mortar 0.37 0.40 demonstrated promising characteristics when extruded at optimum speed 2.5 Moreover, demonstrate application optimised mix, an arch truss prototype subsequently tested failure provide insights into structural behaviour member. From process crack formation accompanying analysis, it that although tensile stresses minimal (a direct result geometry), still governed overall member due presence internal induced by restrained shrinkage.