Study on optimized design of concrete with ultra low water/binder ratio subjected to microwave curing
XIE Yushang
QIU Wenjun
XUE Jia
LI Mingyang
ZHENG Lishang
SHU Ben'an
Abstract：Although microwave curing enhance early-age performance,it often compromises long-term properties.To address this limitation,this study proposes an optimized strategy involving the incorporation of porous aggregates(Zeolite sand)into the cementi-tious matrix to study the optimization effect of microwave curing and zeolite sand on the performance of ultra-low water/binder ratio concrete,and analyze the influencing mechanism through isothermal calorimetry and low-field nuclear magnetic resonance.Results demonstrated that,following 4 minutes of microwave pre-curing,the 7 d compressive strength of the zeolite-modified group increased by 14.5%compared to the control group.The addition of zeolite sand prolonged the induction period while accelerating the subse-quent acceleration phase of hydration.Furthermore,its porous structure contributed positively to later-stage hydration.During mi-crowave curing,zeolite sand provides space for storing high-energy water in the matrix,thereby mitigating rapid energy input during microwave curing and allowing for preparation for later-stage hydration.
Keywords：ultra-low water/binder ratio cementmicrowave curingporous aggregates
Publication Date：2025-11-25
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：6( 43-48 )