盐冻循环对湿筛混凝土损伤演化研究
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摘要
开展了水灰比为0.46的湿筛混凝土在盐冻(5%Na_2SO_4)循环作用下试验研究,分析了材料动弹性模量随冻融循环次数的损伤规律,并推导出混凝土损伤演化方程。研究发现,在冻融初期,混凝土损伤变量增幅十分缓慢,但随着冻融循环次数的增加,其损伤变量增速逐渐加大;与单一的水冻循环相比,盐冻循环极大地加速了混凝土的损伤进程。
The wet sieve concrete with a water-cement ratio of 0.46 was tested under the action of salt freezing(5% Na_2SO_4). The damage law of dynamic elastic modulus with the number of freeze-thaw cycles was analyzed, and the damage evolution equation of concrete was derived. The study shows that the damage variable increases slowly in the early stage of freezing and thawing, but the growth rate of damage variable increased gradually as the number of freeze-thaw cycles increases; the salt freezing greatly accelerated the damage process of concrete compared to a single water-free cycle. The research can provide some reference value for practical engineering application research.
The wet sieve concrete with a water-cement ratio of 0.46 was tested under the action of salt freezing(5% Na_2SO_4). The damage law of dynamic elastic modulus with the number of freeze-thaw cycles was analyzed, and the damage evolution equation of concrete was derived. The study shows that the damage variable increases slowly in the early stage of freezing and thawing, but the growth rate of damage variable increased gradually as the number of freeze-thaw cycles increases; the salt freezing greatly accelerated the damage process of concrete compared to a single water-free cycle. The research can provide some reference value for practical engineering application research.
引文
[1] 王柏源,詹学易,裴端宁.坝基可疑病态——混凝土硫酸盐侵蚀问题的研究与诊断[J].大坝与安全,1994,6(1):31-34.
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[8] 苑立冬.硫酸盐侵蚀与冻融循环共同作用下混凝土耐久性试验研究[D].西安:西安建筑科技大学,2013.
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[10] 李鹏.荷载与盐溶液耦合作用下混凝土耐久性与寿命预测[D].扬州:扬州大学,2014.
[11] 肖前慧.冻融环境多因素耦合作用混凝土结构耐久性研究[D].西安:西安建筑科技大学,2010.
[2] 徐存东,田子荀,谢佳林,等.硫酸盐侵蚀-冻融循环复合作用下混凝土力学性能研究[J].混凝土,2017(10):1-3,11.
[3] 李文霞,朱忠业.干湿-冻融交替作用下混凝土受硫酸盐侵蚀研究[J].混凝土,2017(5):12-14,18.
[4] 姜磊,牛荻涛.硫酸盐与冻融环境下混凝土损伤破坏准则研究[J].防灾减灾工程学报,2017,37(1):148-153.
[5] 李阳,丰辉,李艳香,等.严寒地区某碾压混凝土重力坝温度应力仿真分析[J].人民珠江,2016,37(4):69-73.
[6] 郭彬彬.混凝土冻融损伤模型研究[D].武汉:湖北工业大学,2009.
[7] 骆静静.硫酸盐、氯盐和弯曲荷载作用下混凝土损伤研究[D].扬州:扬州大学,2012.
[8] 苑立冬.硫酸盐侵蚀与冻融循环共同作用下混凝土耐久性试验研究[D].西安:西安建筑科技大学,2013.
[9] 俞君宝.荷载与盐溶液复合作用下混凝土耐久性试验研究[D].扬州:扬州大学,2013.
[10] 李鹏.荷载与盐溶液耦合作用下混凝土耐久性与寿命预测[D].扬州:扬州大学,2014.
[11] 肖前慧.冻融环境多因素耦合作用混凝土结构耐久性研究[D].西安:西安建筑科技大学,2010.