Experimental Study on Printability of 3D-Printed Yellow River Sand-Based Engineered Cementitious Composites

doi:10.16552/j.cnki.issn1001-1625.2025.0520

Abstract

Abstract: Engineered cementitious composites (ECC) were prepared using Yellow River sand, and their printability was systematically investigated based on a printability evaluation system, including extrudability, buildability, flowability, rheological properties, setting time, and heat of hydration. The results show that both the extrusion width and the total vertical height increase with the increase replacement ratio of Yellow River sand. In contrast, the change rates of total vertical height, the change rate of the bottom layer strip thickness, and the ratio of the difference between half of the top width and half of the bottom width to the actual total vertical height (tan θ) decrease continuously with the increase replacement ratio of Yellow River sand. The flowability decreases first and then increases with the rise in the replacement ratio of Yellow River sand, reaching a peak at a 100%(mass fraction) replacement ratio. As the Yellow River sand replacement ratio increases, both the thixotropic loop area and the static yield stress increase continuously, while the dynamic yield stress and consistency coefficient decrease. This indicates that the Yellow River sand ECC exhibit shear-thinning pseudoplastic fluid characteristics. The initial setting time gradually decreases with the increase of Yellow River sand replacement ratio. In the heat of hydration test, 90% of the total heat of hydration release occurrs within the first 50 h, and the heat evolution curve exhibits a bimodal pattern, indicating that the early hydration reaction of Yellow River sand ECC is rapid, follow by a stable mid-term hydration process, which is beneficial to the early strength development of printed component.

Key words: 3D printing, Yellow River sand, engineered cementitious composite, printability, replacement ratio, rheological property

CLC Number:

TU528

HUI Yongjun, ZHANG Junjie, ZHANG Ge, YUAN Chengfang. Experimental Study on Printability of 3D-Printed Yellow River Sand-Based Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4123-4131.

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