摘要
本文针对早强型工程水泥基复合材料(ECC)的自收缩问题,通过正交试验探究了减缩剂(SRA)、膨胀剂(EA)和吸水树脂(SAP)的复合调控效果。结果表明:早强型ECC的自收缩呈现早期快速、中期缓慢和后期稳定的三阶段特征。三种外加剂对收缩的抑制效果依次为SRA>EA>SAP,最优配比为5%EA+0.15%SAP+4%SRA。内部湿度监测显示该配比可延迟湿度下降起始时间15小时,并减少最终降幅。研究为高耐久性早强ECC材料的开发提供了有效调控方法,其复合调控方法对修复工程中材料早期开裂防控具有重要实践价值。
In this paper,for the problem of autogenous shrinkage regulation of early-strength engineered cementitious composites(ECCs),the effects of composite regulation of shrinkage reducing agent(SRA),expansion agent(EA)and water-absorbent resin(SAP)were investigated through orthogonal experiments.The results showed that the self-shrinkage of early-strengthened ECC presented a three-stage characteristic of early fast,middle slow and late stable.The inhibition effect of the three additives on shrinkage was SRA>EA>SAP,and the optimal ratio was 5%EA+0.15%SAP+4%SRA.Internal humidity monitoring showed that this ratio could delay the onset of humidity drop for 15 hours and reduce the final drop.The study provides an effective control method for the development of highly durable and early-strengthened ECC materials,and the composite control method is of great practical value for the prevention and control of early cracking of materials in restoration projects.
作者
余志辉
陈泽辛
刘文化
夏涛
张勇
YU Zhihui;CHEN Zexin;LIU Wenhua;XIA Tao;ZHANG Yong(Leistung(Jiangsu)High-tech Development Co.,Ltd.,Wuxi214000,China;School of Fiber Engineering and Equipment Technology,Jiangnan university,Wuxi,Jiangsu,214000,China)
出处
《工程建设(维泽科技)》
2025年第6期196-200,共5页
Engineering Construction
关键词
早强型ECC
膨胀剂
吸水树脂
减缩剂
自收缩
early-strength ECC
expansion agent
superabsorbent polymers
shrinkage reducing agent
autogenous shrinkage
