Optimization of printing precision and mechanical property for powder-based 3D printed magnesium phosphate cement using fly ash

Liu, Xiongfei; Wang, Nan; Zhang, Yi; Ma, Guowei

doi:10.1016/j.cemconcomp.2024.105482

Cited by 12 publications

(1 citation statement)

References 55 publications

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“…To be effective, 3D concrete printing must exhibit comprehensive properties, including extrudability, pumpability, constructability, and high early strength [1]. Researchers have created 3D printed concrete, including Portland cement [2,3], rapid hardening phosphate-based concrete [4,5], geopolymers [6,7] and sulfate cement [8,9]. Among them, Portland cement is the most widely used concrete material, but the setting time is long.…”

Section: Introductionmentioning

confidence: 99%

Effects of oyster shell derivatives on performance enhancement of biomass-based 3D printed concrete

Du,

Wei,

Zhang

et al. 2024

Mater. Res. Express

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In this research, sustainable oyster shell derivatives were used as partial replacement of Portland cement-sulfate aluminate cement composite (OPC-SAC) composites to investigate the potential application in the mix-stir-extrusion integrated 3D concrete printing. Calcined oyster shell powder (CS) was added into OPC-SAC concrete at 0–15 wt% to prepare a new 3D printed concrete. Additionally, oyster shell particles (CSS) were substituted for river sand at 0–41.7 wt% as another new material. The effects of oyster shell derivatives on the forming mechanism and performance of 3D printed concrete were studied by macro and micro tests. The results demonstrate that the two new materials, which can be printed with an initial setting time within 15–36 min, exhibit superior overall performance compared to OPC-SAC, achieving an efficiency improvement of up to 75%. When the CS content was 15%, the formability of 3D printed concrete reached the best. The optimized compressive strength and flexural strength at 28 days surpassed 40 MPa, and 10 MPa, respectively. Micro-morphological analysis showed that CaO in CS facilitated the hydration reaction of concrete and generated more C-S-H gels and Aft crystals, which resulted in a denser bond between the substances and enhanced the mechanical strength. The above results indicated that both CS and CSS could improve the mechanical properties of OPC-SAC.

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