首页|多筋增强3D打印混凝土力学性能研究

多筋增强3D打印混凝土力学性能研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
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连续微筋同步增强方法满足混凝土 3D打印技术灵活性的要求,可有效提高3D打印混凝土结构的强度和延性.为进一步提高3D打印混凝土结构的承载能力,提出3D打印混凝土多筋同步增强方法.优化多筋同步置入工艺,开展微筋拉拔试验,研究多筋与基体间粘结特性.研究配筋率对抗弯性能的影响,并建立多筋增强3D打印混凝土梁在弯曲作用下的截面承载力计算公式.结果表明,微筋的拔出损伤基体材料,进而降低剩余微筋与基体间粘结强度,且下降幅度随微筋间距减小而增大,微筋间距减小到4 mm时,下降幅度最大达到43.7％.配筋率从0.17％提升到0.75％时,弯曲荷载下,试件极限承载力提升220.0％.建立的计算公式对预测多筋增强3D打印混凝土梁在弯曲作用下的截面承载力具有良好的准确度.
Mechanical Properties of 3D Printed Concrete Reinforced by Embedding Multi-Cables
The synchronous strengthening method of continuous micro-cable meets the flexibility requirements of 3 D printing technology of concrete and can effectively improve the strength and ductility of 3D printed concrete structures.To further improve the bearing capacity of 3D printed concrete structures,a synchronous multi-cables reinforcement method of 3D printed concrete was proposed.Optimizing the multi-cables synchronous embedding process,pull-out tests were carried out to study the bonding characteristics between multi-cables and matrix material.Four-point bending tests were carried out study the effect of reinforcement ratio on the bending performance,and the formula for calculating normal section capacity and oblique section capacity of multi-cables reinforced 3D printed concrete beams was established.The results show that the pull-out of micro-cable damages the matrix material,then reduces the bonding strength between the remaining micro-cables and the matrix material,and decreasing range increases with the decrease of the micro-cables spacing.The maximum decrease is 43.7％when the micro-cable spacing decreases to 4 mm.When the reinforcement ratio of specimen increases from 0.17％to 0.75％,the ultimate bearing capacity of specimen increases by 220.0％under bending load.The established calculation formula has good accuracy for predicting the normal section capacity and oblique section capacity of multi-cables reinforced 3D printed concrete beams.

3D printed concretereinforcing and tougheningmulti-cables synchronous embeddingcementitious materialmechanical propertyreinforcement ratio

罗澍、李之建、王里

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河北工业大学土木与交通学院,天津 300401

3D打印混凝土 增强增韧 多筋同步置入 水泥基材料 力学性能 配筋率

国家自然科学基金青年科学基金国家重点研发计划子课题(十四五)

521082052023YFC3806901

2024

硅酸盐通报
中国硅酸盐学会 中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心
影响因子：0.698
ISSN：1001-1625
年,卷(期)：2024.43(5)