硅酸盐通报2025，Vol.44Issue(8)：2823-2838,16.DOI:10.16552/j.cnki.issn1001-1625.2025.0083
纤维对3D打印UHPC流变性能和力学性能的影响
Effect of Fiber on Rheological and Mechanical Properties of 3DP-UHPC
摘要
Abstract
Ultra-high performance concrete(UHPC)exhibits ultra-high strength and exceptional durability.However,the low water-to-binder ratio and fiber incorporation of UHPC lead to a significant reduction in flowability,which adversely affects both the extrudability and buildability of 3D printing of ultra-high performance concrete(3DP-UHPC)during the printing process.In order to prepare 3DP-UHPC suitable for high temperature environment,this paper explored the effects of different lengths and content of steel fiber and different content of polypropylene fiber on the rheological properties,early mechanical properties and mechanical properties after hardening of 3 DP-UHPC,which provided a preliminary theoretical basis for subsequent high temperature testing.The results show that the length of steel fiber is the key factor affecting the extrudability,and the content of steel fiber and polypropylene fiber is the key factor affecting the buildability.With the increase of polypropylene fiber content,the wet embryo strength gradually decreases,which is the same as the development trend of static yield stress.The 3D printing process restricts the directional arrangement of steel fibers along the printing direction,so that the flexural strength of the 3D printed test block is higher than that of the traditional poured test block,and the pore distribution shows different characteristics.关键词
3D打印超高性能混凝土/钢纤维/流变性能/湿坯强度/硬化后力学性能/三维孔隙分析Key words
3D printing of ultra-high performance concrete/steel fiber/rheological property/wet embryo strength/mechanical property after hardening/3D porosity analysis分类
建筑与水利引用本文复制引用
赵宇,王哲,朱伶俐..纤维对3D打印UHPC流变性能和力学性能的影响[J].硅酸盐通报,2025,44(8):2823-2838,16.基金项目
河南省科技攻关项目(242102230136,232102320191) （242102230136,232102320191）
