Effect of GGBS particle size on weak alkali activated ultra-high performance concrete
ZHANG Shizhuo
SHU Ben'an
YANG Tengyu
QIU Wenjun
Abstract：This study introduces a novel method for preparing ultra-high-performance concrete(UHPC)using a weak alkaline activation system,in which Na2CO3 replaces the traditional NaOH and water glass.Ultrafine mineral powder was used as a substitute for mineral powder,and the effect of ultrafine mineral powder replacement rate on the compressive strength of weak alkali activated UHPC was studied.XRD,FTIR,SEM and other microscopic analyses were used to analyze its hydration products.The findings demonstrate that as the replacement rate of ultrafine mineral powder increased,the compressive strength of weak alkali activated UH-PC significantly improved.Concrete prepared with 100%ultra-fine mineral powder exhibits a compressive strength of up to 109.22 MPa.At 28 days,the content of intermediate polymers in UHPC activated by sodium carbonate exceeded 60%,and the hydration products were not completely generated,resulting in a low degree of polymerization.As the hydration reaction continued,the degree of polymerization of the hydration products gradually increased,and the compressive strength gradually increased.
Keywords：superfine mineral powderalkali activated ultra-high performance concretemechanical propertyhydration mechanism
Publication Date：2025-12-25
Online Publishing Date：2026-01-13(First online date of this platform, not the publication date of the document)
Pages：5( 79-83 )