Abstract
In-situ printing leads to distinctive features of 3D printed concrete (3DPC) to conventional casting concrete, and the temperature of its service environment has significant impacts on the performance development of 3DPC. This emphasizes the importance of investigating the relationships between the structural strength and tempertures considering the characteristics of 3DPC. A maturity model that is suitable for 3DPC was therefore established via tests and least squares regression analysis of the tested results in this paper. The maturity model was verified and calibrated by examining the mechanical properties of 3DPC cured under both fixed and varied environmental temperatures. The anisotropy of the specimens with different temperatures and curing ages was also examined and discussed. It was observed that the proposed maturity model might be able to be applied to the in-place evaluation of early age mechanical properties of 3DPC, with a maximum error of 6.67% for compressive strength and 3.27% for flexural strength under outdoor temperature curing conditions. With the increase of age and curing temperature, the anisotropy parameter of compressive strength tends to approach the limit value obtained by Su. It was also found that there are no significant mechanical-anisotropic behaviors for flexural strength between Y and Z directions.
Published Version
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