首页|玄武岩纤维对3D打印混凝土力学性能的影响

玄武岩纤维对3D打印混凝土力学性能的影响

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为探究玄武岩纤维对 3D 打印混凝土力学性能的影响,设计 0%、0.25%、0.50%、0.75%和1.00%共 5 种不同玄武岩纤维掺量,通过单轴压缩、三点弯曲和层间双剪试验分析玄武岩纤维掺量对3D打印混凝土力学性能的影响,并利用双目倒置金相显微镜和扫描电子显微镜从微观形貌层面分析玄武岩纤维增强混凝土力学性能的作用机制.研究结果表明:掺加玄武岩纤维可显著提升 3D打印混凝土结构的力学性能.随着纤维掺量的增加,抗压和层间抗剪强度呈现出先增加后减小的趋势,掺量为 0.50%时共同达到最优,相较于未掺入玄武岩纤维的混凝土分别提高了 28%和 61%;抗折强度则随着纤维掺量增加一直增加,掺量为 1.00%时效果最佳,相较于未掺入玄武岩纤维的混凝土提高了 21%.打印材料力学性能存在各向异性,沿Z方向加载时抗压和抗折强度最高,Y方向最低;随着纤维掺量增加,力学性能各向异性逐渐增大.结合试验结果和电镜扫描结果可知,玄武岩纤维优异的抗拉性能够抑制裂缝的产生与扩展,从而提升 3D打印混凝土结构的整体力学性能.
Effect of basalt fibers on mechanical properties of 3D printed concrete
In order to explore the effect of basalt fibers on the mechanical properties of 3D printed concrete,five different basalt fiber contents of 0%,0.25%,0.50%,0.75%and 1.00%were designed.The effects of basalt fiber content on the mechanical properties of 3D printed concrete were analyzed by uniaxial compression,three-point bending and interlayer double shear tests.The mechanism of basalt fiber reinforced concrete mechanical properties was analyzed by binocular inverted metallurgical microscope and scanning electron microscope.The results showed that the addition of basalt fiber can significantly improve the mechanical properties of 3D printed concrete structures.With the increase of fiber content,the compressive strength and interlayer shear strength show a trend of increasing first and then decreasing.When the content is 0.50%,the optimum is achieved,which is 28%and 61%higher than that of concrete without basalt fiber,respectively.The flexural strength increases with the increase of fiber content,and the effect is the best when the content is 1.00%,which is 21%higher than that of concrete without basalt fiber.The mechanical properties of the printing material are anisotropic.The compressive and flexural strength are the highest in the Z direction and the lowest in the Y direction.With the increase of fiber content,the anisotropy of mechanical properties increases gradually.Combined with the test results and electron microscope scanning results,it can be seen that the excellent tensile resistance of basalt fiber can inhibit the generation and expansion of cracks,thus improving the overall mechanical properties of 3D printed concrete structures.

3D printed concretebasalt fibermechanical propertiesanisotropymicroscopic morphology

裴强、张禄玺、崔迪、杨雨航、宫泽晨、胡顺彩、丁彧

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大连大学 辽宁省复杂结构系统灾害预测与防治重点实验室,辽宁 大连 116622

大连大学 建筑工程学院,辽宁 大连 116622

大连交通大学 土木工程学院,辽宁 大连 116028

3D打印混凝土 玄武岩纤维 力学性能 各向异性 微观形貌

大连大学科研平台项目国家自然科学基金项目大连市科技创新基金项目辽宁省重点研发计划指导计划项目辽宁省高校复杂结构系统灾害预测与防治重点实验室开放基金项目

202301ZD01518781082023JJ12GX0122019JH8/10100091DLSZD2023011

2024

10.13577/j.jnd.2024.0519

自然灾害学报
中国地震局工程力学所 中国灾害防御协会

自然灾害学报

CSTPCD北大核心
影响因子：0.862
ISSN：1004-4574
年,卷(期)：2024.33(5)
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