Effect of Mine Waste Slag Stone Incorporation on the Performance of 3D Printed Building Component Concrete
YU Pei
XU Kunkun
Abstract：Mining produces a large amount of waste slag stone,and the development and utilization of waste materials generate recycled coarse aggregate,recycled fine aggregate,and recycled powder.The effects of recycled slag powder as a partial substitute for cement and fine aggregate on the properties of cement mortar and concrete were studied through experiments.Two types of recycled fine powder(powder A and powder B)were selected and used to replace cement or fine aggregate at substitution ratios ranging from 5%to 20%.NaOH,Ca(OH)2 and HCl were introduced as activators to explore the best solution.The test results show that,as a substitute for cement,powder B enhances the mortar strength at low substitution rate.As the substitution rate increases,the strength of the mortar at 7 d and 28 d increases initially,then decreases.In the comprehensive replacement test,where powder A replaced 14%of the cement and powder B replaced 20%of the fine aggregate,the compressive strength at 7 d and 28 d reaches 14.2 MPa and 21.5 MPa,respectively.Compared to the minimum replacement amount,the later strength increases faster,meeting the requirements of 3D printing components.This study provides useful insights for the application of recycled micro-powder in cement mortar and concrete,and promotes the utilization of waste resources.
Keywords：regenerated powdercement mortarconcrete performancewaste concretemicro-morphology
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 76-81 )