Bond Behavior of In-Situ Coated Rebars in 3D Printed Concrete
CUI Hongzhi
CAO Lele
CAO Xiangpeng
WU Shuoli
Abstract：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.
Keywords：3D printed concretein-situ coatingself-compact mortarultra-fine grouting cementreinforcing technique
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 210-216 )