3D打印超高性能混凝土的抗渗及抗冻性能研究  

Impermeability and Frost Resistance of 3D Printed Ultra-high Performance Concrete

作　　者：吴凯[1] 赖建中[1,2] 杜龙雨 周捷航 董赛阳 邱士扬 WU Kai;LAI Jian-zhong;DU Long-yu;ZHOU Jie-hang;DONG Sai-yang;QIU Shi-yang(Nanjing University of Science&Technology,Nanjing 210094,China;Nanjing Zhuochunni Intelligent Technology Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]南京理工大学,江苏南京210094 [2]南京啄春泥智能科技有限公司,江苏南京210000

出　　处：《混凝土与水泥制品》2022年第10期1-6,共6页China Concrete and Cement Products

基　　金：国家自然科学基金项目(52078253、51678308)。

摘　　要：设计了一种基于超高性能混凝土配合比的3D打印材料,研究了3D打印混凝土试件和浇筑试件的抗渗性能和抗冻性能。结果表明,用该配合比配制的3D打印混凝土试件和浇筑试件均具有良好的抗渗性能和抗冻性能,试件均能在1.4 MPa水压力下保持不渗水,300次冻融循环后保持较高的力学性能和相对动弹性模量,且3D打印试件测试结果更好。为增强结构密实度,混凝土原材料添加了钢纤维,通过CT扫描发现,3D打印试件结构更加紧密,内部缺陷较少,受到冻融破坏时能保持较完整的结构。A 3D printed material based on the ultra-high performance concrete mix proportion was designed.3D printed specimens and casted specimens were prepared to study their impermeability and frost resistance.The results show that these concrete specimens with ultra-high performance concrete mix proportion have good impermeability and frost resistance.The experimental specimens can maintain impermeability under 1.4 MPa water pressure,and maintain great mechanical properties and relative dynamic elastic modulus after 300 freeze-thaw cycles,and the test results of 3D printed specimens are better.CT scan analysis reveals that the structure of 3D printed concrete is denser.The addition of steel fibers can improve the compactness of the structure when freeze-thaw damage occurrs.Thus,3D printed specimens have better comprehensive performance due to fewer internal defects.

关 键 词：3D打印混凝土 抗冻性 抗渗性 超高性能混凝土 钢纤维 相对动弹性模量 

分 类 号：TU528[建筑科学—建筑技术科学]