Print Email Facebook Twitter Can superabsorbent polymers be used as rheology modifiers for cementitious materials in the context of 3D concrete printing? Title Can superabsorbent polymers be used as rheology modifiers for cementitious materials in the context of 3D concrete printing? Author Chen, Y. (TU Delft Materials and Environment) Liang, M. (TU Delft Materials and Environment) Zhang, Y. (TU Delft Materials and Environment) Li, Z. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Schlangen, E. (TU Delft Materials and Environment) Copuroglu, Oguzhan (TU Delft Materials and Environment) Date 2023 Abstract Autogenous shrinkage may be a critical issue concerning the use of limestone-calcined clay-cement (LC3) in high-performance concrete and 3D printable cementitious materials, which have relatively low water to binder (W/B) ratio. Adding an internal curing agent, i.e., superabsorbent polymer (SAP), could be a viable solution in this context. However, employing SAP (without adding additional water) may also influence the fresh properties of LC3 composites by increasing yield stress and viscosity, which may be beneficial for 3D printability. Therefore, this study attempts to use SAP as a rheology modifying admixture with the aim of investigating the impact of SAP on flow behavior, structural build-up, hydration kinetics, compressive strength, and autogenous shrinkage of LC3 pastes with a fixed W/B (0.3). In addition, hydroxypropyl methylcellulose (a typical rheology/viscosity modifier in 3D printable cementitious materials) was also employed in two mixtures to compare their effects. Results show that adding SAP increases the dynamic yield stress and the apparent viscosity, as well as structural build-up and hydration, but decreases the compressive strength at 3, 7 and 28 days. Furthermore, using SAP (especially 0.2 wt% SAP) not only promotes the early-age expansion but also effectively mitigates the autogenous shrinkage of LC3 pastes for up to 7 days. Overall, the obtained results indicated that SAP could act as a promising rheology modifier for the development of 3D printable cementitious materials. Subject Autogenous shrinkageHydration kineticsLimestone-calcined clay-cementRheology modifierStructural build-upSuperabsorbent polymer To reference this document use: http://resolver.tudelft.nl/uuid:c77297dd-8cad-4769-b779-7cbaa21b2554 DOI https://doi.org/10.1016/j.conbuildmat.2023.130777 ISSN 0950-0618 Source Construction and Building Materials, 371 Part of collection Institutional Repository Document type journal article Rights © 2023 Y. Chen, M. Liang, Y. Zhang, Z. Li, B. Šavija, E. Schlangen, Oguzhan Copuroglu Files PDF 1_s2.0_S0950061823004889_main.pdf 9.08 MB Close viewer /islandora/object/uuid:c77297dd-8cad-4769-b779-7cbaa21b2554/datastream/OBJ/view