[1]陆春华,冯晨阳,平 安,等.对基于动弹性模量的海工混凝土抗冻损伤评价[J].西安建筑科技大学学报(自然科学版),2023,55(04):563-570.[doi:10.15986/j.1006-7930.2023.04.011 ]
　LU Chunhua,FENG Chenyang,PING An,et al.Damage evaluation of frost resistance of marine concrete based on dynamic elastic modulus[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2023,55(04):563-570.[doi:10.15986/j.1006-7930.2023.04.011 ]
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对基于动弹性模量的海工混凝土抗冻损伤评价()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
55
期数:
2023年04期
页码:
563-570
栏目:
出版日期:
2023-10-26

文章信息/Info

Title:
Damage evaluation of frost resistance of marine concrete based on dynamic elastic modulus
文章编号:
1006-7930(2023)04-0563-08
作者:
陆春华; 冯晨阳; 平 安; 杨钰婷
(江苏大学 土木工程与力学学院，江苏 镇江 212013)
Author(s):
LU Chunhua; FENG Chenyang; PING An; YANG Yuting
(College of Civil Engineering and Mechanics,Jiangsu University,Jiangsu Zhenjiang 212013,China)
关键词:
冻融循环;  海工混凝土;  抗压强度;  动弹性模量;  氯离子迁移系数
Keywords:
freeze-thaw cycle;  marine concrete;  compressive strength;  dynamic elastic modulus;  chloride migration coefficient
分类号:
TU502+.6
DOI:
10.15986/j.1006-7930.2023.04.011
文献标志码:
A
摘要:
为分析冻融环境下海工混凝土性能的退化规律,对三种配合比的海工混凝土进行了快速冻融试验,并对其物理力学性能及氯离子渗透性能进行分析与评估.试验结果表明:当冻融循环分别超过25次和50次后,海工混凝土的内部损伤和表面损伤先后出现明显的加剧; 总掺量不变但矿粉含量较多时,海工混凝土的抗冻性较优,且掺入适量纳米SiO2能进一步有效提高混凝土的抗冻性; 以动弹性模量损伤度为依据,对冻融循环作用下海工混凝土的抗压强度损失率及氯离子迁移系数增长率进行分析; 并对动弹性模量损伤度与冻融循环次数的直接关系进行了探讨.分析结果表明经历冻融作用的海工混凝土,其动弹性模量损伤度与抗压强度损失率、氯离子迁移系数增长率之间存在较好的线性关系,且幂函数能有效地反映动弹性模量损伤度与冻融循环次数之间的关系.
Abstract:
In order to analyze the degradation law of marine concrete properties under freeze-thaw environment, the rapid freeze-thaw test was carried out on three kinds of marine concrete mixtures, and the physical and mechanical properties and chloride penetration properties were analyzed and evaluated. The results show that when the freeze-thaw cycles exceed 25 times and 50 times, the internal damage and surface damage of marine concrete are significantly aggravated successively. The frost resistance of marine concrete is better when the total dosage is constant but the content of mineral powder is more, and the frost resistance of concrete can be further improved by adding appropriate amount of nano-SiO2. Based on the damage degree of dynamic elastic modulus, the loss rate of compressive strength and the growth rate of chloride migration coefficient of marine concrete under freeze-thaw cycle were analyzed. The direct relationship between the damage degree of dynamic elastic modulus and the number of freeze-thaw cycles was also discussed. The analysis results show that there is a good linear relationship between the damage degree of dynamic elastic modulus and the loss rate of compressive strength and the growth rate of chloride migration coefficient for marine concrete subjected to freeze-thaw, and the power function can effectively reflect the relationship between the damage degree of dynamic elastic modulus and the number of freeze-thaw cycles.

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备注/Memo

备注/Memo:
收稿日期:2022-11-11修回日期:2023-07-16
基金项目:国家自然科学基金资助项目(51878319)
第一作者:陆春华(1979—)，男，教授，主要从事混凝土结构耐久性等方面研究.E-mail:lch79@ujs.edu.cn
更新日期/Last Update: 2023-08-28