Li Zhuming, Aslani Farhad
Materials and Structures Innovation Group, School of Engineering, The University of Western Australia, Crawley, WA 6009, Australia.
Sensors (Basel). 2023 Oct 16;23(20):8486. doi: 10.3390/s23208486.
This paper aims to explore the structural performance of 3D-printed and casted cement-based steel-reinforced concrete beams and one-way slabs incorporating short carbon fibre and activated carbon powder, which have been shown to enhance concrete's flexural strength and reduce its electrical resistivity. The samples are cast and printed in 250 × 325 × 3500 mm beams and 150 × 400 × 3500 mm one-way slabs and mechanical, electrical, and piezoresistivity properties were measured. This length of beams and one-way slabs with rebars have been considered as they can magnify the flexural and cracking behaviour and make them easier to be monitored and analysed. The samples were loaded up to 80% of maximum stress. Crack propagation and strain was assessed using the 2D digital image correlation (DIC) method. The results compared samples under continuously increasing loads between 3D-printed and cast samples. The 3D-printed composites had a better piezoresistive response due to the enhanced anisotropic behaviour. DIC analysis illustrated similar results among different samples, while 3D-printed blocks had lower cracking performance due to the horizontal case fracture in lower stress.
本文旨在探究掺入短碳纤维和活性炭粉末的3D打印及浇筑的水泥基钢筋混凝土梁和单向板的结构性能，这些材料已被证明能提高混凝土的抗弯强度并降低其电阻率。样品被浇筑和打印成250×325×3500毫米的梁和150×400×3500毫米的单向板，并测量了其力学、电学和压阻性能。考虑了这种带有钢筋的梁和单向板的长度，因为它们可以放大弯曲和开裂行为，使其更易于监测和分析。样品加载至最大应力的80%。使用二维数字图像相关（DIC）方法评估裂纹扩展和应变。结果比较了3D打印样品和浇筑样品在持续增加荷载下的情况。由于各向异性行为增强，3D打印复合材料具有更好的压阻响应。DIC分析表明不同样品之间有类似结果，而3D打印块由于在较低应力下出现水平裂缝而具有较低的开裂性能。
