| 冻融环境下钢筋与粉煤灰混凝土的粘结性能 |
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| 引用本文： | 牛建刚,郝吉,李伯潇.冻融环境下钢筋与粉煤灰混凝土的粘结性能[J].保鲜与加工,2015(6):7-14. |
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| 作者姓名： | 牛建刚 郝吉 李伯潇 |
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| 作者单位： | 内蒙古科技大学 建筑与土木工程学院，内蒙古 包头 014010；,内蒙古科技大学 建筑与土木工程学院，内蒙古 包头 014010；,青岛理工大学琴岛学院 土木工程系，山东 青岛 266106 |
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| 基金项目： | 国家自然科学基金项目(51368042) |
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| 摘 要： | 通过对内贴应变片钢筋的直接拔出试验，分析冻融作用下粉煤灰掺量对钢筋与粉煤灰混凝土间粘结性能的影响，得出冻融循环作用对钢筋与粉煤灰混凝土之间粘结性能的影响规律。试验结果表明：钢筋与粉煤灰混凝土的粘结强度随粉煤灰掺量的增加而降低；当粉煤灰掺量一定时，随着冻融循环次数的增加，混凝土强度有所下降，钢筋与粉煤灰混凝土间极限粘结强度降低；当粉煤灰掺量较大，达到40%时，随冻融次数的增加，钢筋粉煤灰混凝土试件极限粘结强度的下降幅度明显减缓，极限粘结强度对应的滑移量增大。表明掺入较多粉煤灰可使试件的冻融损伤现象得到缓解，冻融环境下钢筋混凝土的粘结性能得到提高。
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| 关 键 词： | 冻融循环 粉煤灰混凝土 直接拔出试验 粘结强度 粘结应力分布 |
| 收稿时间： | 2015/7/30 0:00:00 |
Bonding properties between reinforcement and fly ash concrete under freeze-thaw cycle |
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| Niu Jiangang,Hao Ji and Li Boxiao.Bonding properties between reinforcement and fly ash concrete under freeze-thaw cycle[J].Storage & Process,2015(6):7-14. |
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| Authors: | Niu Jiangang Hao Ji and Li Boxiao |
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| Institution: | School of Architecture and Civil Engineering, Inner Mongolia University of Science and Technology,Baotou 014010, P. R. China;,School of Architecture and Civil Engineering, Inner Mongolia University of Science and Technology,Baotou 014010, P. R. China; and Department of Civil Engineering, Qingdao Technological University Qindao College, Qingdao 266106, P. R. China |
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| Abstract: | The effect of freeze-thaw cycle to the bonding performance between steel bar and fly ash concrete was analysed through pull-out test to steel bars attached strain gages inside. The results of pull-out test under different number of freeze-thaw cycle show that the bonding strength between steel bar and concrete decrease as the content of fly ash increasing; when the content of fly ash stay the same, with the number of freeze-thaw cycle increasing, the concrete compressive strength decline, and the bonding strength decrease; as the fly ash replacement rate stay 40%, with the number of freeze-thaw cycle increasing, the ultimate bonding strength decreased speed reduce, and the free end displacement corresponding to the ultimate bonding strength increase, which shows that mixed with a large number of fly ash can remit the freeze-thaw damage phenomenon, the bonding performance of reinforced concrete specimens under freeze-thaw environment is improved. |
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| Keywords: | freeze-thaw cycle fly ash concrete pull-out test bonding strength bonding stress distributing |
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