Abstract
Cementitious composites blended with high Belite sulfoaluminate cement and medium-heat Portland cements were optimized to achieve both favorable 3D printability and durability performance. The influence of the hybrid cement ratio on the rheology and the hardened properties, such as mechanical properties, drying shrinkage, and carbonization resistance, was systematically investigated. The results revealed that the mixture incorporated with 80% CSA-HB cement exhibited excellent early strength, and a 1d compressive strength higher than 30 MPa was achieved. Hybrid mixing of CSA-HB and P·MH reduces the super-early age hydration heat by 37.8%. Meanwhile, the 28-day carbonization depth of the mixture with 80% P·MH cement was 52.4% lower than that comprising a high content of CSA-HB. The designed mixtures were compatible with the printing process and validated by the printing practice of 9.4 m-span arch components using a large-scale robotic printer.
Published Version
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