Print Email Facebook Twitter Rheological behaviors and viscosity prediction model of cementitious composites with various carbon nanotubes Title Rheological behaviors and viscosity prediction model of cementitious composites with various carbon nanotubes Author Li, Hongyan (Jiangsu Sobute New Materials Co., Ltd) Li, Z. (TU Delft Materials and Environment) Qiu, Liangsheng (Dalian University of Technology) Dong, Sufen (Dalian University of Technology) Ouyang, Jian (Dalian University of Technology) Dong, Xufeng (Dalian University of Technology) Han, Baoguo (Dalian University of Technology) Date 2023 Abstract This study aims to understand the effects and mechanisms of length, diameter, and functional group of carbon nanotubes (CNTs) on rheological behaviors of cementitious composites. The experimental results show that the addition of CNTs decreases the flow index and increases the critical shear rate of cementitious composites. CNTs with a sub-micrometer length and small diameter endow cementitious composites with high yield stresses and minimum viscosities. Influenced by the high water absorption of hydroxylic groups, the minimum viscosity of cementitious composites with hydroxyl functionalized CNTs is larger than that of composites with pristine carbon nanotubes (p-CNTs). By contrast, the yield stress and minimum viscosity of cementitious composites with carboxyl functionalized CNTs are smaller than that of cementitious composites with p-CNTs at most contents due to the high dispersion induced by carboxyl groups. The effect mechanisms of CNTs on rheological behaviors can be attributed to adsorption effect and entanglement effect, which are closely related to length, diameter and functionalization groups of CNTs. The established minimum viscosity prediction model considering the influence of CNT physicochemical features can provide guidance for regulating the workability and hardened performance of CNTs modified cementitious composites. Subject Carbon nanotubesCementitious compositesModelRheologyViscosity To reference this document use: http://resolver.tudelft.nl/uuid:a3a36f0f-e876-4171-ac4a-a782c9861523 DOI https://doi.org/10.1016/j.conbuildmat.2023.131214 Embargo date 2023-10-05 ISSN 0950-0618 Source Construction and Building Materials, 379 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 Hongyan Li, Z. Li, Liangsheng Qiu, Sufen Dong, Jian Ouyang, Xufeng Dong, Baoguo Han Files PDF 1_s2.0_S0950061823009273_main.pdf 6.29 MB Close viewer /islandora/object/uuid:a3a36f0f-e876-4171-ac4a-a782c9861523/datastream/OBJ/view