极端冻融环境混凝土抗冻性能研究
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摘要
寒冷地区冻融损伤是混凝土结构耐久性劣化的重要原因,通过气冻气融试验与水冻水融试验,对极端冻融环境下钢筋混凝土的抗冻性能指标进行测试,包括混凝土的相对动弹性模量变化、质量损失、抗压强度损失、抗折强度损失等,得出了相应的耐久性劣化规律。结果表明:高强度混凝土的抗冻性能优于低强度混凝土,在极端冻融环境下良好的养护条件可以适当提高混凝土的力学性能,钢纤维的掺入也在一定程度上提高混凝土的抗冻性能,相较于气冻气融试验,水冻水融试验机制下混凝土的抗冻性能良好。
Freeze-thaw damage in cold regions is an important reason for durability deterioration of concrete structures,Adopting the frozen gas melting experiment with water and frozen water melts,the frost resistance indexes of reinforced concrete under extreme freeze-thaw environment were tested,including the relative dynamic elastic modulus of concrete damage, mass loss, compressive strength loss, flexural strength loss and so on, the corresponding degradation rule of the the durability was obtained. The results showed that the frost resistance of highstrength concrete was higher than that of low-strength concrete,good curing conditions under extreme freeze-thaw environment could properly improve the mechanical properties of concrete,the addition of steel fibers could also improve the frost resistance of concrete to a certain extent.Compared with air-freezing and air-thawing tests,the frost resistance of concrete under water-freezing and water-thawing test was better.
Freeze-thaw damage in cold regions is an important reason for durability deterioration of concrete structures,Adopting the frozen gas melting experiment with water and frozen water melts,the frost resistance indexes of reinforced concrete under extreme freeze-thaw environment were tested,including the relative dynamic elastic modulus of concrete damage, mass loss, compressive strength loss, flexural strength loss and so on, the corresponding degradation rule of the the durability was obtained. The results showed that the frost resistance of highstrength concrete was higher than that of low-strength concrete,good curing conditions under extreme freeze-thaw environment could properly improve the mechanical properties of concrete,the addition of steel fibers could also improve the frost resistance of concrete to a certain extent.Compared with air-freezing and air-thawing tests,the frost resistance of concrete under water-freezing and water-thawing test was better.
引文
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[2]邹汉文,刘俊,夏雨,等.混凝土抗冻性试验方法及评价指标[J].中国科技信息,2018,586(14):42-43.
[3] TANG S W,YAO Y,ANDRADE C,et al. Recent Durability Studies on Concrete Structure[J]. Cement and Concrete Research,2015,78:143-154.
[4] BAANT Z P, CHERN J C, ROSENBERG A M, et al.Mathematical Model for Freeze-Thaw Durability of Concrete[J].Journal of the American Ceramic Society,1988,71(9):776-783.
[5]徐存东,程昱,高懿伟,等.基于可拓层次分析法的混凝土材料抗冻耐久性影响因素分析[J].硅酸盐通报,2018,37(4):1181-1187.
[6]牛荻涛,肖前慧.混凝土冻融损伤特性分析及寿命预测[J].西安建筑科技大学学报(自然科学版),2010,42(3):319-322.
[7]肖前慧,牛荻涛,朱文凭.冻融环境下混凝土强度衰减模型与耐久性寿命预测[J].建筑结构,2011(增刊2):203-207.
[8]霍俊芳,王聪,侯永利,等.纤维再生混凝土的抗冻性能及孔结构研究[J].硅酸盐通报,2018(7):10.
[9]关虓,牛荻涛,王家滨,等.考虑塑性应变及损伤阈值的混凝土冻融损伤本构模型研究[J].防灾减灾工程学报,2015,35(6):777-784.
[10]杜鹏,姚燕,王玲,等.冻融循环与氯盐侵蚀作用下混凝土的损伤模型[J].硅酸盐通报,2014,33(4):841-846.
[11]邱继生,潘杜,谷拴成,等.钢纤维煤矸石混凝土抗冻性能及损伤模型研究[J].冰川冻土,2018,40(3):563-569.
[12]魏毅萌,柴军瑞,覃源,等.冻融循环下再生混凝土孔隙分布变化及其对抗冻性能的影响[J].硅酸盐通报,2018,37(3):825-830.
[13]陈升平,郭彬彬.不同类型混凝土冻融循环试验与损伤模型研究[C]//全国结构工程学术会议论文集.乌鲁木齐:2013.
[14] POWER T C. A Working Hypothesis for Further Studies of Frost Resistance of Concrete[J]. ACI Jour.,1945,41:245-272.
[15]徐小巍.不同环境下混凝土冻融试验标准化研究[D].杭州:浙江大学,2010.
[16]中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009.