不同掺合料混凝土与锈蚀钢筋间粘结-滑移力学性能试验研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2767-2773.

不同掺合料混凝土与锈蚀钢筋间粘结-滑移力学性能试验研究

庄彬彬¹, 萧超雄¹, 刘强², 邓嘉辉², 汪大洋²

1.中广核工程有限公司设计院,深圳 518124;
2.广州大学土木工程学院,广州 510006

收稿日期:2022-03-25 修回日期:2022-04-26 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 刘强,博士研究生。E-mail:1112016008@e.gzhu.edu.cn
作者简介:庄彬彬(1986—),男,工程师。主要从事海水冷却塔耐久性的研究。E-mail:zhuangbinbin@cgnpc.com.cn
基金资助:
广东省自然科学基金面上项目(2020A1515010993);广州市羊城学者项目(科技类)(202032866);广州市基础研究计划市校(院)联合资助项目(202102010459)

Experimental Study on Bond-Slip Mechanical Properties of Concrete with Different Admixtures and Corroded Reinforcement

ZHUANG Binbin¹, XIAO Chaoxiong¹, LIU Qiang², DENG Jiahui², WANG Dayang²

1. China Nuclear Power Engineering Co., Ltd., Shenzhen 518124, China;
2. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

Received:2022-03-25 Revised:2022-04-26 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 采用中心拉拔法对普通混凝土(PC)、水泥基渗透结晶防水混凝土(CCCW)、聚丙烯纤维混凝土(PFRC)与热轧带肋钢筋进行粘结-滑移试验。通过电化学锈蚀方法对钢筋进行加速锈蚀,研究锈蚀后钢筋与混凝土粘结性能。结果表明:在混凝土中引入适量聚丙烯纤维及水泥基渗透结晶防水材料能够显著提升其对钢筋的极限粘结强度,分别提高了20.8%、6.8%;无论是否添加掺合料,钢筋-混凝土拉拔试件的极限粘结力均随着锈蚀率的增大呈线性下降趋势。基于锈蚀构件拉拔试验结果,拟合出不同混凝土的极限粘结强度与锈蚀率计算公式,发现随着锈蚀率的增大,聚丙烯纤维及水泥基渗透结晶防水材料能减缓钢筋-混凝土极限粘结强度下降速度。

关键词: 聚丙烯纤维混凝土, 水泥基渗透结晶防水混凝土, 中心拉拔, 粘结性能, 电化学锈蚀, 钢筋锈蚀, 钢筋混凝土

Abstract: The center-drawing method was used to conduct bond-slip tests on plain concrete (PC), cementitious capillary crystalline water-proofing concrete (CCCW), and polypropylene fiber reinforced concrete (PFRC) with hot-rolled ribbed steel reinforcement. To investigate the bonding capability of the reinforcement with concrete after rusting, the electrochemical corrosion method was used to accelerate the rusting of the reinforcement. The results show that introducing an appropriate amount of polypropylene fiber and capillary crystallinewater-proofing material into the concrete increase the ultimate bond strength of reinforced steel by 20.8% and 6.8%, respectively. The ultimate bond strength of reinforcement-concrete pull-out specimens with and without admixture shows a linear decreasing trend with the increase of corrosion rate. The formula of ultimate bond strength of concrete with different internal admixtures and corrosion rate is fitted based on the results of the pull-out test, and it is discovered that polypropylene fiber and capillary crystalline water-proofing material could slow down the decrease of ultimate bond strength of reinforced-concrete with the increase of corrosion rate.

Key words: polypropylene fiber reinforced concrete, cementitious capillary crystalline water-proofing concrete, central pull-out, bond behavior, electrochemical corrosion, corrosion of reinforcement, reinforcement concrete

中图分类号:

TU528.57

庄彬彬, 萧超雄, 刘强, 邓嘉辉, 汪大洋. 不同掺合料混凝土与锈蚀钢筋间粘结-滑移力学性能试验研究[J]. 硅酸盐通报, 2022, 41(8): 2767-2773.

ZHUANG Binbin, XIAO Chaoxiong, LIU Qiang, DENG Jiahui, WANG Dayang. Experimental Study on Bond-Slip Mechanical Properties of Concrete with Different Admixtures and Corroded Reinforcement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2767-2773.

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