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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.

摘要
参数
结论
参考文献
引用本文

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. 

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(1)与自由态混凝土相比,约束态混凝土盐冻循环下表面损伤程度明显加重,混凝土的表面损伤主要来自于表面冰层和混凝土之间变形量的差异,模拟结果和试验结果相符合。
(2)混凝土的内部孔隙结冰后对孔壁产生压力并产生微裂纹,约束态混凝土的微裂纹发展受到抑制,更加难以被探测,因而约束态混凝土内部损伤程度更轻,模拟结果和试验结果相符合。
(3)掺加引气剂能够明显降低盐冻循环下混凝土的表面损伤,但对于降低内部损伤的作用不明显。气孔的存在能在一定程度上干扰混凝土内部微裂纹发展,气孔含量越高微裂纹越难连通,表面剥落程度则越轻。
(4)为简化分析过程,本文中的模拟并未充分考虑水泥基材料的非均质性、水泥基材料的尺寸效应、混凝土内部饱水程度等因素。因此,模拟结果仅能定性反映混凝土的盐冻损伤过程,可为混凝土盐冻损伤研究提供一定参考。在未来研究中,应当考虑水泥基材料中的各相(孔隙、骨料等)的分布以及尺寸效应,得到的结果能够定量反映混凝土的盐冻损伤程度,会更加符合实际。

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徐亚丁,高志浩,王玲,.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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