| 冻融环境下混凝土的断裂损伤试验研究 |
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| 引用本文： | 宁作君,巴恒静,杨英姿.冻融环境下混凝土的断裂损伤试验研究[J].哈尔滨工程大学学报,2009,30(1). |
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| 作者姓名： | 宁作君 巴恒静 杨英姿 |
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| 作者单位： | 哈尔滨工业大学土木工程学院,黑龙江哈尔滨,150090 |
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| 摘 要： | 为研究冻融作用后混凝土的断裂性能及断裂特征,依据GBJ82-85混凝土快速冻融循环试验方法,对24组共72块混凝土试件进行冻融试验.采用四点弯曲试验法分析了300次快速冻融循环条件下水灰比、引气剂对混凝土断裂韧度,断裂能及相对动弹模损失率的影响,并进行了混凝土形貌分析.结果表明,随冻融循环次数的增加,混凝土的断裂韧度、断裂能及相对动弹模损失率呈明显下降趋势,水灰比越大、混凝土随冻融循环次数增加损伤程度越大.引气剂能够大幅度降低由于冻融循环造成的混凝土结构的损伤,断裂能损失率与相对动弹模损失率之间具有良好的线性关系.
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| 关 键 词： | 冻融循环 四点弯曲试验 损伤 断裂韧度 断裂能 |
Experimental study of fracture damage in concrete subjected to freeze-thaw cycles |
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| NING Zuo-jun,BA Heng-jing,YANG Ying-zi.Experimental study of fracture damage in concrete subjected to freeze-thaw cycles[J].Journal of Harbin Engineering University,2009,30(1). |
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| Authors: | NING Zuo-jun BA Heng-jing YANG Ying-zi |
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| Affiliation: | School of Civil Engineering;Harbin Institute of Technology;Harbin 150090;China |
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| Abstract: | To study fracture performance and characteristics of concrete experiencing freeze-thaw cycles,applying the GBJ82-85 test method for frost resistance of concrete,freeze-thaw experiments were done with 72 concrete blocks which were classified into 24 groups.Four-point bending tests were used to examine the effects of water-cement ratio and air-entraining agents on fracture toughness,fracture energy and the dynamic elastic modulus of concrete subjected to 300 rapid freeze-thaw cycles.The microstructures of the... |
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| Keywords: | freeze-thaw cycles four-point bending test damage fracture toughness fracture energy |
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