城市生活垃圾焚烧灰渣混凝土抗冻性能研究  

Experimental Study on Anti-freezing Performance of Municipal Waste Incineration Ash Concrete

作　　者：贾伟龙 JIA Weilong(Xinjiang Jiaotou Engineering Consulting Co.,Ltd.,Urumqi Xinjiang 830099,China)

机构地区：[1]新疆交投工程咨询有限责任公司,新疆乌鲁木齐830099

出　　处：《交通节能与环保》2024年第4期163-167,共5页Transport Energy Conservation & Environmental Protection

摘　　要：为探究不同质量分数的生活垃圾焚烧灰渣作为细集料对水泥混凝土抗冻性能的影响,本文采用3种细集料替代率(0,25%,50%)和3种水胶比(0.25,0.4,0.55)进行配合比设计,通过测试混凝土的动弹模量、质量损失率、含气量、比表面积、气孔间距系数、平均气孔弦长等指标,分析不同焚烧灰渣替代率下混凝土的抗冻性能。结果表明:与普通混凝土类似,焚烧灰渣混凝土的冻融损伤程度随水胶比的增大而提高;焚烧灰渣替代率的增加可提升混凝土的抗冻等级,且其丰富的棱角性可减少混凝土在冻融作用下的退化速率;0.25水胶比+50%替代率下的宏观抗冻性能和微观结构最佳,可满足工程实践需求。To investigate the influence of different quality grades of municipal solid waste incineration ash as fine aggregates on the frost resistance of cement concrete,a mix design was conducted using three replacement levels of fine aggregates(0,25%,50%)and three water-to-binder ratios(0.25,0.4,0.55).Concrete’s dynamic modulus of elasticity,mass loss rate,as well as indicators including air content,specific surface area,pore spacing factor,and average pore chord length were tested to analyze the frost resistance of concrete under various incineration ash substitution rates.The results indicate that,similar to ordinary concrete,the extent of freeze-thaw damage in ash concrete increases with higher water-to-binder ratios.An increase in the substitution rate of incineration ash enhances the frost resistance grade of the concrete,and its angular characteristics reduce the degradation rate of concrete under freeze-thaw conditions.The macroscopic frost resistance and microstructure are optimal when using a 0.25 water-to-binder ratio with a 50%substitution rate,meeting the requirements of engineering practice.

关 键 词：生活垃圾 焚烧灰渣混凝土 替代率 抗冻性能 

分 类 号：U416.26[交通运输工程—道路与铁道工程]