Enhanced compressive performance of concrete via 3D-printing reinforcement

Abstract

Carbon-nanotube shaped reinforcement (CSR) and traditional latitude and longitude reinforcement (LLR) made of tough resin were 3D printed and applied to concrete specimens. The element numbers of 10, 12, and 14 per layer were selected to investigate the reinforcement by CSR and LLR separately. The uniaxial compressive behaviors of the CSR and LLR reinforced concrete specimens were studied by a series of laboratory tests. The experimental results indicate that the strength of a CSR reinforced specimen with 10, 12, and 14 elements per layer increases by 59.77%, 85.94%, and 108.98%, respectively, compared with the unreinforced specimen. The strength of the LLR reinforced specimen with 10, 12, and 14 elements per layer increases by 24.22%, 46.88%, and 68.75%, respectively, compared with the unreinforced specimen. CSR thus demonstrates higher efficiency in compressive strength improvement than LLR does. The results also show that the failure pattern changes from global failure to partial failure as the element number per layer of CSR increases. The present research provides a potential innovative reinforcing technology for civil engineering applications.

概要

目 的

研究3D 打印仿碳纳米管加筋结构对混凝土单轴 受压力学性能的加固机制。

创新点

提出一种采用仿碳纳米管加筋结构对混凝土进行 加固的方法。

方 法

1. 以韧性树脂为材料,采用光固化3D 打印技术 分别制作疏密度为每层10 个单元、12 个单元和14 个单元的仿碳纳米管加筋结构和传统纵横加 筋结构。2. 将配制的M2.5 水泥砂浆作为填充材 料,制备直径为100 mm、高为200 mm 的圆柱型 单轴压缩试件。3. 以相同尺寸内部无加筋的素混 凝土试件作为参考进行抗压试验。

结 论

1. 与素混凝土相比,当试件采用每层10 个单元、 12 个单元和14 个单元的仿碳纳米管加筋结构时, 混凝土试件抗压强度分别提高59.77%、85.94% 和108.98%。2. 当试件采用每层10 个单元、12 个单元和14 个单元的传统纵横加筋结构时,混 凝土试件抗压强度分别提高24.22%、46.88%和 68.75%。3. 仿碳纳米管加筋结构对混凝土的加固 效果明显优于传统纵横加筋结构。4. 仿碳纳米管 加筋后试件的破坏形式随着加筋密度的增加由 整体破坏转变为局部破坏。