约束态混凝土单面盐冻损伤数值模拟及试验研究

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发布时间：2020-01-06 00:00:00

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约束态混凝土单面盐冻损伤数值模拟及试验研究

Research on Numerical Simulation and Damage of Restrained Concrete Under Single-side Salt Freezing and Thawing

2022年第8期

约束态混凝土；单面盐冻损伤；数值模拟；表面剥落量；相对动弹性模量

Restrained concrete; Single-side salt freezing damage; Numerical simulation; Surface spalling amount; Relative dynamic elastic modulus

2022年第8期

10.19761/j.1000-4637.2022.08.026.05

“十三五”国家重点研发计划课题资助项目（2017YFB0309901）；国家自然科学基金面上项目（51972295）。

徐亚丁1,2，高志浩1，王玲1，赵霞1，王振地1

1.中国建筑材料科学研究总院绿色建筑材料国家重点试验室，北京 100024；2.代尔夫特理工大学，代尔夫特荷兰

徐亚丁1,2，高志浩1，王玲1，赵霞1，王振地1

徐亚丁,高志浩,王玲,等.约束态混凝土单面盐冻损伤数值模拟及试验研究[J].混凝土与水泥制品,2022(8):26-30.

XU Y D,GAO Z H,WANG L,et al.Research on Numerical Simulation and Damage of Restrained Concrete Under Single-side Salt Freezing and Thawing[J].China Concrete and Cement Products,2022(8):26-30.

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摘要：为研究约束态与自由态混凝土单面盐冻劣化行为及机理，利用Abaqus/Explicit对混凝土表面和内部损伤过程进行了数值模拟研究，设计了混凝土约束装置，并对比研究了约束态和自由态混凝土单面盐冻循环的表面剥落量和相对动弹性模量损失。结果表明：与自由态混凝土相比，约束态混凝土表面损伤更严重，但内部损伤较轻；掺引气剂可以明显减少约束态混凝土的表面损伤；气孔的存在干扰了表面微裂纹的发展，含气量高的混凝土表面盐冻损伤程度较低；混凝土与表面冰层间变形量的差异是导致约束态混凝土表面损伤更严重的原因；约束抑制了混凝土内部微裂纹的发展，导致约束态混凝土比自由态混凝土内部损伤更轻。 Abstract: In order to study the degradation behavior and mechanism of restrained concrete and free-state concrete under single-side salt freezing and thawing, the surface and internal damage processes of concrete were numerically simulated by using Abaqus/Explicit. The concrete restraint device was designed. The surface spalling amount and relative dynamic elastic modulus loss of restrained concrete and free-state concrete under one-side salt freezing cycle were studied and compared. The results show that compared with the free-state concrete, the surface damage of restrained concrete is more serious, but the internal damage is less. Addition of air entraining agent can reduce the surface damage of restrained concrete obviously. The existence of pores interferes with the development of surface cracks, and the degree of salt freezing damage on the surface of concrete with high air content is lower. The great difference between the deformation of concrete and the surface ice is the reason for the greater surface damage of restrained concrete. Confinement inhibits the development of micro-cracks in the concrete, resulting in less damage in the restrained concrete.

英文名 : Research on Numerical Simulation and Damage of Restrained Concrete Under Single-side Salt Freezing and Thawing

刊期 : 2022年第8期

关键词 : 约束态混凝土；单面盐冻损伤；数值模拟；表面剥落量；相对动弹性模量

Key words : Restrained concrete; Single-side salt freezing damage; Numerical simulation; Surface spalling amount; Relative dynamic elastic modulus

刊期 : 2022年第8期

DOI : 10.19761/j.1000-4637.2022.08.026.05

文章编号 :

基金项目 : “十三五”国家重点研发计划课题资助项目（2017YFB0309901）；国家自然科学基金面上项目（51972295）。

作者 : 徐亚丁1,2，高志浩1，王玲1，赵霞1，王振地1

单位 : 1.中国建筑材料科学研究总院绿色建筑材料国家重点试验室，北京 100024；2.代尔夫特理工大学，代尔夫特荷兰

徐亚丁1,2，高志浩1，王玲1，赵霞1，王振地1

徐亚丁,高志浩,王玲,等.约束态混凝土单面盐冻损伤数值模拟及试验研究[J].混凝土与水泥制品,2022(8):26-30.

XU Y D,GAO Z H,WANG L,et al.Research on Numerical Simulation and Damage of Restrained Concrete Under Single-side Salt Freezing and Thawing[J].China Concrete and Cement Products,2022(8):26-30.

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摘要

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结论

参考文献

引用本文

Abstract: In order to study the degradation behavior and mechanism of restrained concrete and free-state concrete under single-side salt freezing and thawing, the surface and internal damage processes of concrete were numerically simulated by using Abaqus/Explicit. The concrete restraint device was designed. The surface spalling amount and relative dynamic elastic modulus loss of restrained concrete and free-state concrete under one-side salt freezing cycle were studied and compared. The results show that compared with the free-state concrete, the surface damage of restrained concrete is more serious, but the internal damage is less. Addition of air entraining agent can reduce the surface damage of restrained concrete obviously. The existence of pores interferes with the development of surface cracks, and the degree of salt freezing damage on the surface of concrete with high air content is lower. The great difference between the deformation of concrete and the surface ice is the reason for the greater surface damage of restrained concrete. Confinement inhibits the development of micro-cracks in the concrete, resulting in less damage in the restrained concrete.

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