| 冻融循环过程中混凝土内部微观结构的演变 |
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| 引用本文： | 汪在芹,李家正,周世华,石妍. 冻融循环过程中混凝土内部微观结构的演变[J]. 混凝土, 2012, 0(1): 13-14 |
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| 作者姓名： | 汪在芹 李家正 周世华 石妍 |
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| 作者单位： | 长江水利委员会长江科学院水利部水工程安全与病害防治工程技术研究中心 |
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| 基金项目： | 水利部公益性行业科研专项经费项目(200901066);长江科学院中央级公益科研(CKSF2010013);国家自然科学基金重点项目(50539010) |
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| 摘 要： | 试验研究了冻融破坏过程中混凝土强度、内部结构的演变规律。试验结果表明:与抗压强度相比,抗折强度、劈拉强度的劣化趋势更明显;冻融破坏使水泥水化产物的结构从堆积状密实体逐步变成疏松状态,气泡壁逐步出现了开裂。从孔径分布情况来看,孔径25~75 nm之间的孔隙所占的比例呈增大趋势。
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| 关 键 词： | 混凝土 冻融循环 强度 微观结构 |
Development of microscopic structure of concrete exposed to freeze-thaw cycles |
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| WANG Zai-qin,LI Jia-zheng,ZHOU Shi-hua,SHI Yan. Development of microscopic structure of concrete exposed to freeze-thaw cycles[J]. Concrete, 2012, 0(1): 13-14 |
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| Authors: | WANG Zai-qin LI Jia-zheng ZHOU Shi-hua SHI Yan |
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| Affiliation: | (Center on Water Engineering Safety and Disaster Prevention of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China) |
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| Abstract: | Strength and internal structure of concrete subjected to freeze-thaw cycles were experimentally studied.Results show that flexural strength and splitting tensile strength of concrete presented more evident damage than compressive strength.After freeze-thaw cycles,density of hydration products of cement was decreased,leading to the cracking of bubble wall and the increase of 25~75 nm porosity. |
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| Keywords: | concrete freeze-thaw cycles strength microscopic structure |
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