首页|冻融环境下钢渣细骨料混凝土微观结构及损伤演化模型

冻融环境下钢渣细骨料混凝土微观结构及损伤演化模型

Microstructure and damage evolution model of steel slag fine aggregates concrete under freezing-thawing environment

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为了揭示工业钢渣细骨料制备的钢渣混凝土的冻融破坏机理,采用快速冻融法进行试验,测试了冻融循环后不同钢渣细骨料替代率混凝土的质量损失率、强度损失率、相对动弹性模量,并分析冻融损伤规律;使用扫描电镜方法观察钢渣混凝土水化产物及钢渣-砂浆界面过渡区,进行冻融损伤微观机理的分析.结果表明:钢渣细骨料因冻融作用而发生明显破坏;钢渣细骨料与水泥凝胶的界面过渡区优于普通骨料;钢渣替代率为60%时混凝土的质量、强度损失最小,分别只减少了4.06%、44.2%;钢渣替代率为100%时混凝土的质量、强度损失率最高,分别为6.05%、58%;冻融循环次数大于50时,钢渣掺量为60%的混凝土相对动弹性模量高于其余掺量组;采用钢渣取代细骨料为提高混凝土在冻融循环作用下的工作性能时建议取代率为60%.通过对钢渣混凝土的损伤演变分析,建立了钢渣混凝土的冻融损伤演变模型.
The goals of this paper are to study the frost resistance of steel slag fine concrete(SSFC),re-search the damage mechanisms in cold regions.First,the mass loss rate,strength loss rate,relative dynamic elastic modulus of concrete with different steel slag fine aggregate replacement rates after freezing-thawing cycles were tested,and the freezing-thawing damage law was analyzed.Scanning electron microscopy meth-od was used to observe the hydration products of steel slag concrete and the steel slag-mortar interface transition zone for the analysis of freezing-thawing damage microscopic mechanisms.The results revealed that the steel slag fine aggregate is significantly damaged by freezing-thawing action.Interfacial transition zone of steel slag fine concrete is superior to that of ordinary concrete.The minimum mass and strength loss of concrete at 60%replacement rate of steel slag fine concrete,only 4.06%and 44.2%reduction,re-spectively.The highest mass and strength loss rates of concrete are 6.05%and 58%,respectively,with 100%replacement of steel slag fine concrete.When the number of freeze-thaw cycles is greater than 50,the relative dynamic elastic modulus of concrete with 60%of steel slag fine concrete is higher than the rest of the dosing group.In order to improve the performance of concrete under freezing-thawing cycles,60%replacement rate of steel slag fine concrete is recommended.Finally,the freezing-thawing damage evolution model of steel slag concrete was established by analyzing the damage evolution s of steel slag concrete specimens.

steel slag concretehydration productsstrength lossrelative dynamic modulus of elasticitydamage model

王晨霞、周阳升、王高峰、刘涛、王晓云、曹芙波

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内蒙古科技大学土木工程学院,014010包头

包钢集团冶金渣综合利用开发有限责任公司,014010包头

钢渣混凝土 水化产物 强度损失 相对动弹性模量 损伤模型

国家自然科学基金内蒙古自治区自然科学基金

518680612020MS050712022LHMS05011

2024

应用力学学报
西安交通大学

应用力学学报

CSTPCD北大核心
影响因子:0.398
ISSN:1000-4939
年,卷(期):2024.41(3)
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