A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of metakaolin on the fresh and hardened properties of 3D printed cementitious composite
Highlights: Metakaolin improved thixotropy and buildability of 3D printed cement composite (3DPCC). Metakaolin accelerated the stiffness and early performance development of 3DPCC. Metakaolin enhanced the mechanical properties and inhibited the shrinkage of 3DPCC.
Abstract 3D concrete printing (3DCP) receives worldwide attention, however, incorporating metakaolin (MK) as rheology modifier to develop 3D printed cementitious composites (3DPCC) is limited. In this study, the effect of MK was studied from the perspectives of both fresh and hardened properties. Results showed that compared with control, static yield stress, dynamic yield stress, and viscosity increase by 285.4%, 129.5%, and 49.2% with 10% MK. The increase in the thixotropic area showed that the addition of MK improves the buildability. Meanwhile, the specimens added with MK exhibited increased maximum stress and elastic modulus under unconfined compression, indicating that MK could enhance the early performance of the 3DPCC. Moreover, the stiffness development process of 3DPCC was observed from its failure pattern at fresh state, and MK was found to accelerate the failure pattern change from plastic failure to shear failure. Besides, MK also showed improved 3DPCCs’ mechanical properties and the inhibition of the drying shrinkage because of its pozzolanic activity and filling effect. It is believed that MK positively affects both fresh and hardened properties of the 3DPCC and is therefore recommended to be utilized in 3DCP.
Effect of metakaolin on the fresh and hardened properties of 3D printed cementitious composite
Highlights: Metakaolin improved thixotropy and buildability of 3D printed cement composite (3DPCC). Metakaolin accelerated the stiffness and early performance development of 3DPCC. Metakaolin enhanced the mechanical properties and inhibited the shrinkage of 3DPCC.
Abstract 3D concrete printing (3DCP) receives worldwide attention, however, incorporating metakaolin (MK) as rheology modifier to develop 3D printed cementitious composites (3DPCC) is limited. In this study, the effect of MK was studied from the perspectives of both fresh and hardened properties. Results showed that compared with control, static yield stress, dynamic yield stress, and viscosity increase by 285.4%, 129.5%, and 49.2% with 10% MK. The increase in the thixotropic area showed that the addition of MK improves the buildability. Meanwhile, the specimens added with MK exhibited increased maximum stress and elastic modulus under unconfined compression, indicating that MK could enhance the early performance of the 3DPCC. Moreover, the stiffness development process of 3DPCC was observed from its failure pattern at fresh state, and MK was found to accelerate the failure pattern change from plastic failure to shear failure. Besides, MK also showed improved 3DPCCs’ mechanical properties and the inhibition of the drying shrinkage because of its pozzolanic activity and filling effect. It is believed that MK positively affects both fresh and hardened properties of the 3DPCC and is therefore recommended to be utilized in 3DCP.
Effect of metakaolin on the fresh and hardened properties of 3D printed cementitious composite
Duan, Zhenhua (author) / Li, Lei (author) / Yao, Qinye (author) / Zou, Shuai (author) / Singh, Amardeep (author) / Yang, Haifeng (author)
2022-08-12
Article (Journal)
Electronic Resource
English
Effect of Incorporating Metakaolin on Fresh and Hardened Properties of Concrete
| British Library Conference Proceedings | 2001
Fresh and hardened properties of self-compacting concrete containing metakaolin
| British Library Online Contents | 2012
Fresh and hardened properties of self-compacting concrete containing metakaolin
| Online Contents | 2012
Fresh and hardened properties of self-compacting concrete containing metakaolin
| British Library Online Contents | 2012