Perrot A, Jacquet Y, Rangeard D, Courteille E, Sonebi M
Univ. Bretagne Sud, UMR CNRS 6027, IRDL, F-56100 Lorient, France.
INSA Rennes, EA 3913, LGCGM, F-35000 Rennes, France.
Materials (Basel). 2020 Mar 26;13(7):1518. doi: 10.3390/ma13071518.
Today, the extrusion-based 3D printing of concrete is a potential breakthrough technology for the construction industry. It is expected that 3D printing will reduce the cost of construction of civil engineering structures (removal of formwork) and lead to a significant reduction in time and improve working environment conditions. Following the use of this additive manufacturing layer-wise process, it is required to change the way concrete structures are designed and reinforced, especially for the parts of the structure under tension loads. Indeed, the extrusion-based concrete 3D printing process does not allow for the production of conventional reinforced concrete, and there is a need to develop other ways of compensating for the low mechanical performances of concrete, particularly in tension. In this study, the reinforcement of printed structures by using steel nails through the deposited layers of fresh concrete was investigated. Additionally, three-layer and 10-layer samples were reinforced with nails with varying inclination and spacing. The results show that inclined nails can be used to provide a flexural strengthening of the printing material in different directions.
如今，基于挤压的混凝土3D打印是建筑业一项具有潜在突破性的技术。预计3D打印将降低土木工程结构的建造成本（去除模板），并大幅减少时间并改善工作环境条件。在采用这种逐层增材制造工艺之后，需要改变混凝土结构的设计和加固方式，特别是对于承受拉力荷载的结构部件。实际上，基于挤压的混凝土3D打印工艺无法生产传统的钢筋混凝土，因此需要开发其他方法来弥补混凝土尤其是抗拉方面较低的力学性能。在本研究中，研究了通过在新浇筑的混凝土沉积层中使用钢钉来增强打印结构。此外，对具有不同倾斜度和间距的钉子加固的三层和十层样品进行了研究。结果表明，倾斜的钉子可用于在不同方向上对打印材料提供抗弯加固。
