原位涂层钢筋增强3D打印混凝土握裹力  

Bond Behavior of In‑Situ Coated Rebars in 3D Printed Concrete

作　　者：崔宏志[1,2,3] 曹乐乐 曹香鹏 巫烁理 CUI Hongzhi;CAO Lele;CAO Xiangpeng;WU Shuoli(Key Laboratory for Resilient Infrastructures of Coastal Cities(MOE),Shenzhen University,Shenzhen 518060,China;State Key Laboratory of Subtropical Building and Urban Science,Shenzhen University,Shenzhen 518060,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学滨海城市韧性基础设施教育部重点实验室,广东深圳518060 [2]深圳大学亚热带建筑与城市科学全国重点实验室,广东深圳518060 [3]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《建筑材料学报》2025年第3期210-216,共7页Journal of Building Materials

基　　金：深圳市基础研究重点项目(JCYJ20200109114203853);深圳市科技计划项目(KQTD20200909113951005)。

摘　　要：为解决直接插入钢筋增强3D打印混凝土技术中的空隙问题,提出了原位涂层技术.分别使用自密实砂浆与超细灌浆水泥作为原位涂层材料,制备了原位涂层钢筋增强3D打印混凝土,研究了钢筋在混凝土中的拉拔性能.结果表明:使用水泥基材料对钢筋进行原位涂层,可以得到密实的钢筋-混凝土界面,与直接插入技术相比,拉拔强度得到了最大345.0%的提升;钢筋拉拔曲线符合常规的四段式.这证明使用水泥基材料的原位涂层技术可以实际应用于3D打印混凝土的加筋工艺中,并有效提升3D打印混凝土结构的力学性能及耐久性能,为混凝土3D打印技术的工程应用提供了创新方法及理论基础.To address the gap issue between the directly-inserted rebars and printed concrete,an in-situ technique was proposed to coat the inserted rebars to diminish the voids and enhance the bonding performance.The self-compact mortar and ultra-fine grouting cement were separately used as the in-situ coating materials to prepare in-situ coated rebar-reinforced 3D printed concrete.Experimental results shows that dense contact was established between the rebar and the composite,and the bonding strengths were maximally improved by 345.0%higher than that of the direct-inserted rebars.The bond-slip behavior of the steel bar conforms to the conventional four-segment curve pattern.These findings indicate that the cement-based in-situ coating technique is highly effective for reinforcing 3D printed concrete,significantly enhancing its mechanical properties and long-term durability.This innovative approach provides both a practical solution and a theoretical foundation for the engineering application of concrete 3D printing technology.

关 键 词：3D打印混凝土 原位涂层 自密实砂浆 超细灌浆水泥 加筋增强技术 

分 类 号：TU502.6[建筑科学—建筑技术科学]