Bonding Behavior of Spray-Based 3D Printing Magnesium Phosphate Cement and Concrete

Abstract

Abstract: In this paper, combining the all-angle intelligent construction of spray-based 3D printing and magnesium phosphate cement (MPC) with fast hardening, high early strength and excellent bonding performance, the bonding behavior of the spray-based 3D printing MPC and concrete was studied. By adding metakaolin (MK) and fly ash (FA) to adjust the setting time, rheological properties and mechanical properties of the MPC, a spray-based 3D printing MPC was developed, and the change rule of the bond strength and microstructure of the interface between the spray-based 3D printing MPC and concrete was investigated. The results show that MK significantly prolongs the setting time of MPC by reducing the hydration heat release rate of MPC, and FA shortens the difference between initial setting time and final setting time of MPC, thus improving the stability of spray-based 3D printing MPC. The flexural strength of MPC increases first and then decreases with the addition of MK. FA further improves the flexural strength of MPC. With the increase of MK content, the static yield stress of MPC gradually increases. The effect of FA on the yield stress of MPC is not obvious, but the plastic viscosity of MPC significantly reduces. When adding 30%MK and 15%FA, the construction and pumping performance of MPC can be ensured. Through high-speed spray extrusion, the spray-based 3D printing improves the bond strength between MPC and concrete, which make the micro interface between MPC and concrete compact.

Key words: spray-based 3D printing, magnesium phosphate cement, bonding behavior, rheological property

CLC Number:

TU528

LIU Xiongfei, LI Qi, WANG Li, WANG Nan. Bonding Behavior of Spray-Based 3D Printing Magnesium Phosphate Cement and Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1895-1904.

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