Research on the regulation of rheological properties of 3D printed recycled concrete and multi-objective optimization of printer parameters

IF 5.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI:10.1016/j.powtec.2026.122265

Yuanxun Zheng , Yate Li , Xinyue Xi , Zhenghan Sun , Guanqin Guo , Yuxin Zhao , Qianqian Cao

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引用次数: 0

Abstract

The technology of 3D printed recycled aggregate concrete (3DPRAC) offers dual benefits by advancing the intelligent transformation of the construction industry and promoting sustainable development, which has garnered considerable research interest. This study first investigated the effects of resting time and recycled fine aggregate (RFA) replacement rate on the fluidity of 3DPRAC through fluidity tests, and explored the regulatory mechanisms of its rheological properties. The correlation between fluidity and both buildability and mechanical performance was established, with the underlying mechanisms further elucidated via microstructural analysis. Subsequently, response surface methodology (RSM) was employed to systematically examine the influence of key printing parameters, including extrusion speed, horizontal printing speed, and vertical movement speed, on the material's performance. Through multi-objective optimization, an optimal parameter combination was identified. The results demonstrate that controlling the fluidity within 160–180 mm enables stable shaping without collapse, achieving a buildability height of up to 205 mm. Moreover, under the optimized parameters, namely an extrusion speed of 0.77 r/s, a horizontal printing speed of 40.8 mm/s, and a vertical movement speed of 10.3 mm/s, the material exhibits superior printing quality and structural stability, with both buildability and mechanical performance reaching their optimum. This study provides a theoretical basis and technical support for the engineering application of 3DPRAC.

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3D打印再生混凝土流变特性调控及打印机参数多目标优化研究

3D打印再生骨料混凝土（3DPRAC）技术具有推进建筑行业智能化转型和促进可持续发展的双重效益，已引起广泛的研究兴趣。本研究首先通过流动性测试考察了静置时间和再生细骨料（RFA）置换率对3DPRAC流动性的影响，并探讨了其流变性能的调控机制。建立了流动性与可建造性和力学性能之间的相关性，并通过微观结构分析进一步阐明了潜在的机制。随后，采用响应面法（RSM）系统考察了挤出速度、水平打印速度和垂直移动速度等关键打印参数对材料性能的影响。通过多目标优化，确定了最优的参数组合。结果表明，将流动性控制在160-180 mm范围内，可以实现稳定成型而不坍塌，可建性高度可达205 mm。在挤出速度为0.77 r/s、水平打印速度为40.8 mm/s、垂直移动速度为10.3 mm/s的优化参数下，材料的打印质量和结构稳定性较好，可构建性和力学性能均达到最佳。本研究为3DPRAC的工程应用提供了理论基础和技术支持。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.