严酷水环境下胶-混凝土界面黏结性能
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TV331

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国家自然科学基金青年基金(51409084)


Research on bond performance of adhesive-concrete interface under harsh water environment
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    摘要:

    为了研究胶-混凝土界面黏结性能在严酷水环境下的劣化规律,设计了胶-混凝土黏结试件在泡淡水、泡淡水与持续荷载耦合以及冻融循环3种环境下的劣化试验。试验方案同时考虑了2种混凝土强度和2种界面胶黏剂,共制作了100个试件。在劣化处理后,对试件进行四点弯曲试验,实测了不同劣化时长下试件的破坏荷载、破坏形态和荷载-位移曲线。在此基础上,分析了胶-混凝土界面黏结性能的劣化规律。试验结果表明:淡水环境对胶-混凝土界面的影响可忽略不计;淡水与持续荷载耦合环境的劣化作用较为明显,42 d后试件的最大承载力的下降可达41.2%;冻融循环的劣化作用在循环次数25次时不明显,但当循环次数达到50次后,试件最大承载力的下降可达28.3%;各种劣化环境下试件的破坏形态均为胶-混凝土混合破坏;荷载-位移曲线表明胶-混凝土混合破坏属于脆性破坏。

    Abstract:

    In order to study the deterioration law of the bond performance of adhesive-concrete interface, the deterioration tests of adhesive-concrete specimens were designed under the environments of freshwater, coupling of freshwaters and sustain load, and freeze-thaw cycles. Considering two kinds of concrete strengths and two kinds of adhesive in the tests, a total of 100 sandwiched beam specimens containing adhesive-concrete interface were prepared. After the deterioration treatment, the specimens were experimented by four-point bending test, and the failure load, failure mode and load-displacement curves at different time were measured. Based on test results, the deterioration law of bond performance of the adhesive-concrete interface was analyzed. The test results showed that the influence of freshwater environment on the adhesive-concrete interface was negligible, the deterioration effect under coupled environment of freshwater and sustain load was more significant, and the ultimate load capacity of specimens decreased by 41. 2% after 42 days. Besides, the deterioration effect of freeze-thaw cycles was not significant after 25-times cycles, but the ultimate load capacity of the specimens decreased by 28. 3% after 50-times cycles. The failure mode of specimens under various deterioration conditions was adhesive-concrete mixed failure, and the load-displacement curves showed that this kind of failure was brittle failure.

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王永泉,周博,谭卓群,等.严酷水环境下胶-混凝土界面黏结性能[J].河海大学学报(自然科学版),2019,47(6):529-534.(WANG Yongquan, ZHOU Bo, TAN Zhuoqun, et al. Research on bond performance of adhesive-concrete interface under harsh water environment[J]. Journal of Hohai University (Natural Sciences),2019,47(6):529-534.(in Chinese))

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  • 在线发布日期: 2019-11-25
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