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Aggregate-bed 3D concrete printing with cement paste binder
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.cemconres.2020.106169
Shiwei Yu , Hongjian Du , Jay Sanjayan

Abstract 3D concrete printing (3DCP) is an emerging construction method, which has the potential to revolutionize the building industry by enabling construction automation. This paper presents a feasible concrete printing process, where cement-based filament is extruded onto aggregates bed to form layer-by-layer structures. Distinct from extrusion-based concrete printing, coarse aggregates are incorporated in the printing process and serve as the supporting material. A prototype printer has been successfully developed and aggregate content could reach about 40% in the printed concrete. Furthermore, the printed structures gained compressive strength up to 48.9 MPa and flexural strength up to 7.5 MPa at 28 days, which satisfies the general engineering requirement. Besides, an apparent mechanical anisotropy was found in printed structures and the reason of this anisotropy is the voids formed around aggregate layers and the weak interfacial transition zone located between aggregate and paste.

中文翻译:

使用水泥浆粘合剂的骨料床 3D 混凝土打印

摘要 3D 混凝土打印 (3DCP) 是一种新兴的施工方法,它有可能通过实现施工自动化来彻底改变建筑行业。本文提出了一种可行的混凝土打印工艺,其中水泥基长丝被挤出到骨料床上以形成逐层结构。与基于挤压的混凝土印刷不同,粗骨料被纳入印刷过程并作为支撑材料。原型打印机已成功开发,打印的混凝土中骨料含量可达40%左右。此外,打印结构在 28 天时获得了高达 48.9 MPa 的抗压强度和高达 7.5 MPa 的弯曲强度,满足了一般工程要求。除了,
更新日期:2020-10-01
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