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挤出型3D打印混凝土力学性能研究进展
Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete
2021年第3期
3D打印混凝土;力学性能;各项异性;增强措施
3D printed concrete; Mechanical property; Anisotropy; Enhanced method
2021年第3期
10.19761/j.1000-4637.2021.03.001.06
国家重点研发计划资助项目(2018YFC0705800);国家自然科学基金青年科学基金项目(51708109);江苏省基础研究计划(自然科学基金)——青年基金项目(BK20180383)。
黎宝山,姚一鸣,鲁 聪
东南大学 土木工程学院,江苏 南京 211189

黎宝山,姚一鸣,鲁 聪

黎宝山,姚一鸣,鲁聪.挤出型3D打印混凝土力学性能研究进展[J].混凝土与水泥制品,2021(3):1-6.

LI B S, YAO Y M, LU C.Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):1-6.

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摘   要:介绍了3D打印混凝土的特点与前景,综述了挤出型工艺的3D打印混凝土的压、拉、折、剪基本力学性能以及增强措施。研究表明:打印层在喷嘴的挤压作用下密实度有所提高,但同时层间易形成薄弱界面,造成性能的各向异性,通过调整胶凝材料、掺入纤维、优化工艺、水浴养护、布筋等措施能有效改善。此外,提出了还需进一步研究的问题。 Abstract: The characteristics and developing trend of 3D printed concrete technique are introduced. The mechanical properties including compression, tension, bending, shear and reinforcement measures of the 3D printed concrete are reviewed. The researches show the compactness of 3D printing layer is improved under the extrusion effect of nozzle, but there are obvious weak interface between the layers, leading to a great anisotropy. However, it can be effectively improved by adjusting the material composition, optimizing the processing manner, adopting special cured methods and steel reinforcement. In addition, the problems required for further research are put forword.
英文名 : Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete
刊期 : 2021年第3期
关键词 : 3D打印混凝土;力学性能;各项异性;增强措施
Key words : 3D printed concrete; Mechanical property; Anisotropy; Enhanced method
刊期 : 2021年第3期
DOI : 10.19761/j.1000-4637.2021.03.001.06
文章编号 :
基金项目 : 国家重点研发计划资助项目(2018YFC0705800);国家自然科学基金青年科学基金项目(51708109);江苏省基础研究计划(自然科学基金)——青年基金项目(BK20180383)。
作者 : 黎宝山,姚一鸣,鲁 聪
单位 : 东南大学 土木工程学院,江苏 南京 211189

黎宝山,姚一鸣,鲁 聪

黎宝山,姚一鸣,鲁聪.挤出型3D打印混凝土力学性能研究进展[J].混凝土与水泥制品,2021(3):1-6.

LI B S, YAO Y M, LU C.Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):1-6.

摘要
参数
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参考文献
引用本文

摘   要:介绍了3D打印混凝土的特点与前景,综述了挤出型工艺的3D打印混凝土的压、拉、折、剪基本力学性能以及增强措施。研究表明:打印层在喷嘴的挤压作用下密实度有所提高,但同时层间易形成薄弱界面,造成性能的各向异性,通过调整胶凝材料、掺入纤维、优化工艺、水浴养护、布筋等措施能有效改善。此外,提出了还需进一步研究的问题。

Abstract: The characteristics and developing trend of 3D printed concrete technique are introduced. The mechanical properties including compression, tension, bending, shear and reinforcement measures of the 3D printed concrete are reviewed. The researches show the compactness of 3D printing layer is improved under the extrusion effect of nozzle, but there are obvious weak interface between the layers, leading to a great anisotropy. However, it can be effectively improved by adjusting the material composition, optimizing the processing manner, adopting special cured methods and steel reinforcement. In addition, the problems required for further research are put forword.

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混凝土3D打印技术作为一种新型智能化建造技术,具有广阔的发展前景,同时也面临着诸多挑战。在力学性能方面,3D打印混凝土具有以下特性:
(1)层间孔隙率的增大形成了薄弱界面。这导致力学强度在沿打印方向上降低的程度大于其他方向,从而表现出明显的各向异性。对于纤维混凝土,沿打印方向定向分布的纤维能提高该方向的抗拉强度,但同时会引入更多的层间空隙而降低层间黏结强度。因此,其各向异性更加显著。
(2)改善3D打印混凝土力学性能的关键在于提高层间黏结强度。调整材料组成、降低打印间隔时间、控制水分蒸发、改善养护环境等均能改善打印质量,改善后的力学强度可以达到甚至超过传统浇筑试件。
(3)无模板施工使得表面水分更易蒸发而形成更多干缩裂纹,这对后期的强度发展及耐久性不利。应采取水浴养护控制水分蒸发,减缓干缩现象。


需要研究和解决的问题:
(1)层间黏结强度决定着3D打印混凝土的各项力学性能,提高层间黏结强度的工艺措施仍有待深入研究。
(2)已有研究大多集中在水泥砂浆和纤维增强水泥基材料方面,而粗骨料打印和配筋打印技术还不够成熟。 
(3)尚没有专门针对3D打印混凝土力学试验方法的规范,各学者的试验大多遵循普通混凝土力学性能的试验方法进行。需要建立一定的标准,对3D打印混凝土的本构模型进行深入研究。
随着研究的不断深入,3D打印混凝土的力学性能不断得到改善,3D打印技术将在建筑工程领域得到更广泛的应用。

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黎宝山,姚一鸣,鲁聪.挤出型3D打印混凝土力学性能研究进展[J].混凝土与水泥制品,2021(3):1-6.

LI B S, YAO Y M, LU C.Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):1-6.

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