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| 3D打印结构加强混凝土短柱抗压力学性能研究 |
| An experimental study of compressive mechanical properties of concrete short column strengthened by 3D-printing structure |
| Received:March 16, 2017 Revised:April 19, 2017 |
| DOI：10.7520/1001-4888-17-063 |
| 中文关键词: 3D打印结构 加强混凝土 力学性能 单轴压缩试验 |
| 英文关键词:3D-printing structure reinforcement concrete mechanical behavior unconfined compression |
| 基金项目:国家自然科学基金国家重大科研仪器研制项目资助(项目号： 51627812) |
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| 中文摘要: |
| 以韧性树脂为材料，采用光固化3D打印技术，制作由若干纵筋和环向箍筋组成的3D打印结构网架，用于加强混凝土材料。混凝土试件为直径100mm，高200mm的圆柱，由M2.5水泥砂浆为基体，配筋率体积比为2.17%。另制作相同尺寸的无加筋素混凝土试件作对比试验。单轴压缩试验结果表明，与素混凝土试件相比，3D打印结构加强混凝土试件的抗压强度提高了53.28%，峰值应变提高了70.22%，极限应变提高了164.66%，峰前吸收能量值提高了134.21%。3D打印结构加强混凝土试件破坏后强度下降比素混凝土试件更缓慢，在破坏形态上，加强后的试件裂纹更窄。本文论证了3D打印结构加强混凝土在工程中应用的可行性。 |
| 英文摘要: |
| Taking tough resin as material, adopting light curing 3-D printing technology, 3-D printed grid structure composed of several longitudinal bars and hoop stirrups was fabricated to reinforce the concrete specimen. The concrete specimen is a circular column with diameter of 100mm and height of 200mm. M2.5 cement mortar is used as the matrix, and the ratio of reinforcement to volume is 2.17%. Unreinforced concrete specimens with the same size were made for contrast experiment. Uniaxial compression experimental results show that compared with plain concrete specimen, the compressive strength of concrete specimens strengthened by 3D printing structure increases by 53.28%, peak strain increases by 70.22%, the ultimate strain increases by 164.66%, the pre-peak absorption energy increases by 134.21%, respectively. After peak strength, the strength degradation of concrete specimens strengthened by 3-D printing structure is more slowly than that of plain concrete specimens. Moreover, in the failure mode, the crack of the strengthened specimen is narrower. Finally, the application feasibility in engineering of above concrete reinforcement technology based on 3D-printing is demonstrated. |
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