冻融循环作用下混凝土的硫酸盐应力腐蚀特性
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国家重点基础研究发展计划973计划(2009CB623203);江苏省自然科学基金前期预研项目(BK2005216);2008年江苏省“六大人才高峰”高层次人才项目和南京航空航天大学博士生创新基金(BCXJ07-04)


Stress Corrosion of Concrete Exposed to the Action of Freezing-thawing Cycles
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    摘要:

    在质量分数为5.0%的MgSO4溶液条件下,采用快冻法和常温腐蚀方法研究了高强混凝土(High Strength Concrete,HSC)、大掺量矿物掺合料混凝土(High-Volume Mineral Admixture Concrete,HVMAC)和综合运用引气剂、高效减水剂、混杂纤维和膨胀剂技术的高耐久性混凝土(High Durable Concrete,HDC)的应力腐蚀行为。结果表明:无论是常温条件还是冻融循环条件,混凝土在应力腐蚀作用下的相对动弹性模量要经历强化和劣化2个发展阶段,强化和劣化阶段的时间长度与实验温度条件密切相关。冻融循环作用显著加速了混凝土的硫酸盐应力腐蚀破坏进程,HSC在冻融循环作用下应力腐蚀的强化段和劣化段的时间长度比常温条件的相应时间长度分别压缩了96%和88%以上,HVMAC的劣化段时间长度则压缩了98%,而HDC压缩了71%。在冻融循环作用下,HDC发生应力腐蚀破坏的冻融循环次数分别比HSC和HVMAC延长了1.5倍和13倍,因此,在中国寒冷地区,HDC表现出更强的抗硫酸盐应力腐蚀能力。

    Abstract:

    Through the method of accelerated freezing-thawing and room-temperature corrosion, the stress corrosion of three kinds of concretes subjected to 5.0%MgSO4(in mass)solution was studied. The considered concretes include High Strength Concrete(HSC), High-Volume Mineral Admixture Concrete(HVMAC) and High Durable Concrete(HDC) added with high-volume mineral admixture, air-entraining agent, superplasticizer, fibers and expansion agent. The results showed that the relative dynamic elastic modulus of concrete went through strengthen and deterioration stages subjected to stress corrosion, whether the room temperature or freezing and thawing conditions. The length of time of these two stages are closely related with the experimental temperature. Freezing and thawing action significantly accelerated the process of sulphate stress corrosion damage. Under the action of freezing and thawing, stress corrosion strengthening the period length of HSC shorter 96%, deterioration section of the length of time shorter 88%, compared with the length of time at the corresponding room temperature. Deterioration section of the length of time of HVMAC is reduced by 98%, while the HDC reduced by 71%. The effect of freezing and thawing, HDC freezing-thawing cycles when the stress corrosion damage occurred were longer 1.5 times and 13 times than the HSC and HVMAC. Thus in the cold regions, HDC showed more resistance to sulfate stress corrosion.

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张云清,余红发,孙伟,张建业.冻融循环作用下混凝土的硫酸盐应力腐蚀特性[J].土木与环境工程学报(中英文),2010,32(6):147-152. ZHANG Yun-qing, YU Hong-fa, SUN Wei, ZHANG Jian-ye. Stress Corrosion of Concrete Exposed to the Action of Freezing-thawing Cycles[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2010,32(6):147-152.10.11835/j. issn.1674-4764.2010.06.026

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  • 收稿日期:2010-04-20
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