Print Email Facebook Twitter 3D printing of calcined clay-limestone-based cementitious materials Title 3D printing of calcined clay-limestone-based cementitious materials Author Chen, Y. (TU Delft Materials and Environment) He, S. (TU Delft Materials and Environment) Zhang, Y. (TU Delft Materials and Environment) Wan, Z. (TU Delft Materials and Environment) Copuroglu, Oguzhan (TU Delft Materials and Environment) Schlangen, E. (TU Delft Materials and Environment) Date 2021 Abstract This paper aims to investigate the influences of high Portland cement substitutions (>60 wt%) by low-grade calcined clay (CC) and limestone (LF) on 3D concrete printability, stiffness evolution and early-age hydration. Results show that, with the same dosage of admixtures (superplasticizer and viscosity modifier), increasing LF and CC content reduced the slump, flowability and initial material flow rate, and significantly improved the buildability of fresh mixtures, which can be attributed to the reduced water film thickness (WFT). Furthermore, the stiffness evolution and SSAtotal development up to the first 3 h were accelerated by increasing CC content, which can also be linked to the change of WFT, and consumption of superplasticizer for the dispersion induced by hydration products. Additionally, the dilution effect on compressive strength and hydration caused by the high cement replacement was observed. Subject 3D concrete printingCalcined clayEarly-age hydrationStiffness evolutionSustainable cementitious material To reference this document use: http://resolver.tudelft.nl/uuid:11fac5d5-6e05-47c4-96b0-cc08c80d02d5 DOI https://doi.org/10.1016/j.cemconres.2021.106553 ISSN 0008-8846 Source Cement and Concrete Research, 149, 1-19 Part of collection Institutional Repository Document type journal article Rights © 2021 Y. Chen, S. He, Y. Zhang, Z. Wan, Oguzhan Copuroglu, E. Schlangen Files PDF 1_s2.0_S0008884621002027_main.pdf 5.22 MB Close viewer /islandora/object/uuid:11fac5d5-6e05-47c4-96b0-cc08c80d02d5/datastream/OBJ/view