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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年03期

页码:

90-98

栏目:

出版日期:

2021-05-25

文章信息/Info

Title:

Research on Mechanical Properties of Nano-SiO₂ Strengthened Recycled Aggregate Concrete Beam with Corroded Reinforcements

作者:

延永东¹,梁晓封¹,刘荣桂¹,徐鹏飞²,司有栋¹

(1. 江苏大学 土木工程与力学学院,江苏 镇江 212013; 2. 上海中森建筑与工程设计顾问有限公司,上海 200062)

Author(s):

YAN Yong-dong¹, LIANG Xiao-feng¹, LIU Rong-gui¹, XU Peng-fei², SI You-dong¹

(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Shanghai Zhongsen Architecture and Engineering Design Consulting Co., Ltd., Shanghai 200062, China)

关键词:

纳米SiO₂;  再生粗骨料;  非均匀锈蚀;  受力性能

Keywords:

nano-SiO₂;  recycled aggregate;  non-uniform corrosion;  mechanical performance

分类号:

TU528.45

DOI:

10.19815/j.jace.2020.10014

文献标志码:

A

摘要:

采用纳米强化再生骨料表面的措施来改善再生骨料性能,分别考虑强化液中纳米SiO₂掺量、再生粗骨料取代率的影响,设计制作了1根普通混凝土基准梁和8根再生骨料混凝土矩形截面梁,采用内置近距离小阴极的方法对梁内受力钢筋进行通电非均匀加速锈蚀,待受拉主筋锈蚀到一定程度后进行四点受弯加载,对加载过程中的裂缝开展情况、荷载-挠度曲线以及极限承载力进行了记录及分析。考虑钢筋锈蚀率及再生骨料取代率等因素的影响,对锈胀开裂之后的再生骨料混凝土梁的承载力计算公式进行了修正,得出了可用于设计的受弯承载力计算公式。结果表明:相同锈蚀程度下,强化再生骨料混凝土梁的抗弯承载力比天然骨料混凝土有所降低,其中25%再生骨料取代率时承载性能退化较多,抗弯承载力下降19.3%; 混凝土裂缝开展趋势较为一致,最大裂缝宽度随钢筋锈蚀程度增加而增大,随纳米SiO₂掺量增加先减小后增大; 近距离小阴极通电可实现混凝土内钢筋的加速非均匀锈蚀; 所提出的方法及获得的结论有助于推动再生骨料混凝土在沿海等不利环境中的应用。

Abstract:

Measurement of nano-reinforced recycled aggregate surface was adopted to improve the performance of recycled aggregate. Considering the influences of nano-SiO₂ content and replacement ratio of recycled aggregate, 1 ordinary performance concrete(OPC)beam and 8 recycled aggregate concrete(RAC)beams were designed and made. Non-uniform corrosion of steel was accelerated with electrification between the steel bar and a nearby fine stainless-steel wire embedded in concrete beams. The crack development, load-deflection curve and ultimate bearing capacity were recorded and analyzed during four-point bend loading process after the reinforcement achieved a desired corrosion condition. The calculation formula of bearing capacity of RAC beams after corrosion-induced cracking was revised by considering the effects of steel corrosion ratio and replacement ratio of recycled aggregate. The results show that the flexure capacity of RAC beam is lower than that of natural aggregate concrete beam with the same corrosion ratio. The bearing capacity of RAC beam with 25% replacement of recycled aggregate decreases 19.3%, which is larger than other RAC beams. The development of concrete crack is basically same for all beams. The maximum crack width increases with the increase of corrosion ratio of reinforcement and decreases firstly and then increases with the increase of nano-SiO₂ content. Non-uniform corrosion of steel in concrete can be accelerated with electrification between the steel bar and a nearby fine stainless-steel wire embedded in concrete beams. The proposed method and results are helpful to promote the application of RAC in coastal environment.

参考文献/References:

[1] 程东辉,俞永志,董志鹏.无粘结预应力再生粗骨料混凝土梁力学性能[J].建筑科学与工程学报,2016,33(1):30-37.
CHENG Dong-hui,YU Yong-zhi,DONG Zhi-peng.Mechanical Properties of Unbonded Prestressed Recycled Coarse Aggregate Concrete Beam[J].Journal of Architecture and Civil Engineering,2016,33(1): 30-37.
[2]FALESCHINI F,ZANINI M A,PELLEGRINO C,et al.Sustainable Management and Supply of Natural and Recycled Aggregates in a Medium-size Integrated Plant[J].Waste Management,2016,49:146-155
[3]陈爱玖,王 璇,解 伟,等 再生混凝土梁受弯性能试验研究[J].建筑材料学报,2015,18(4):589-595
CHEN Ai-jiu,WANG Xuan,XIE Wei,et al.Experimental Research on Flexural Property of Recycled Concrete Beam[J].Journal of Building Material,2015,18(4):589-595.
[4]SEARA-PAZ S,GONZALEZ-FONTEBOA B,MARTINEZ-ABELLA F,et al.Flexural Performance of Reinforced Concrete Beams Made with Recycled Concrete Coarse Aggregate[J].Engineering Structures,2018,156:32-45.
[5]刘 超,白国良,张 玉,等.基于荷载长期效应再生混凝土梁受弯性能试验及刚度计算方法[J].建筑结构学报,2016,37(增2):1-8.
LIU Chao,BAI Guo-liang,ZHANG Yu,et al.Study on Stiffness Calculation Method and Flexural Performance of Recycled Concrete Beam Based on Long-term Loading Effect[J].Journal of Building Structures,2016,37(S2):1-8.
[6]杜进生,王 健,韦锦帆,等.再生混凝土梁开裂弯矩与抗弯刚度计算方法[J].中国公路学报,2019,32(3):93-100.
DU Jin-sheng,WANG Jian,WEI Jin-fan,et al.Methods for Calculating Cracking Moment and Flexural Stiffness of Recycled Concrete Beams[J].China Journal of Highway and Transport,2019,32(3):93-100.
[7]MUKHARJEE B B,BARAI S V.Influence of Nano-silica on the Properties of Recycled Aggregate Concrete[J].Construction and Building Materials,2014,55:29-37.
[8]李文贵,龙 初,罗智予,等.纳米改性再生骨料混凝土破坏机理研究[J].建筑材料学报,2017,20(5):685-691,786.
LI Wen-gui,LONG Chu,LUO Zhi-yu,et al.Investigation on Failure Mechanism of Nanomodified Recycled Aggregate Concrete[J].Journal of Building Materials,2017,20(5):685-691,786.
[9]林腾玮,刘孙涛,罗素蓉,等.纳米SiO₂改性再生混凝土抗氯离子的渗透性能实验[J].福州大学学报:自然科学版,2019,47(4):533-537.
LIN Teng-wei,LIU Sun-tao,LUO Su-rong,et al.Experimental Study on Chlorine Ion Penetation Resistance of Nano-SiO₂ Modified Recycled Concrete[J].Journal of Fuzhou University:Natural Science Edition,2019,47(4):533-537.
[10]延永东,徐鹏飞,姚嘉诚,等.超声分散处理的纳米再生混凝土基本性能[J].建筑科学与工程学报,2020,37(5):124-131.
YAN Yong-dong,XU Peng-fei,YAO Jia-cheng,et al.Basic Performance of Nano-reinforced Recycled Concrete Adopting Ultrasonic Dispersion Technology[J].Journal of Architecture and Civil Engineering,2020,37(5):124-131.
[11]曹万林,肖建庄,叶涛萍,等.钢筋再生混凝土结构研究进展及其工程应用[J].建筑结构学报,2020,41(12):1-16,27.
CAO Wan-lin,XIAO Jian-zhuang,YE Tao-ping,et al.Research Progress and Engineering Application of Reinforced Recycled Aggregate Concrete Structure[J].Journal of Building Structures,2020,41(12):1-16,27.
[12]GB/T 25177—2010,混凝土用再生粗骨料[S].
GB/T 25177—2010,Recycled Coarse Aggregate for Concrete[S].
[13]FU C Q,JIN N G,YE H L,et al.Non-uniform Corrosion of Steel in Mortar Induced by Impressed Current Method:An Experimental and Numerical Investigation[J].Construction and Building Materials,2018,183:429-438.
[14]朱勇年,张鸿儒,孟 涛,等.纳米SiO₂改性再生骨料混凝土工程应用研究及实体性能监测[J].混凝土,2014(7):138-144.
ZHU Yong-nian,ZHANG Hong-ru,MENG Tao,et al.Performance of Nano-SiO₂ Modified Recycled Aggregate Concrete Applied in a Real Project[J].Concrete,2014(7):138-144.
[15]袁迎曙,贾福萍,蔡 跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52,92.
YUAN Ying-shu,JIA Fu-ping,CAI Yue.The Structural Behavior Deterioration Model for Corroded Reinforced Concrete Beams[J].China Civil Engineering Journal,2001,34(3):47-52,92.
[16]干伟忠,金伟良,高明赞.混凝土中钢筋加速锈蚀试验适用性研究[J].建筑结构学报,2011,32(2):41-47.
GAN Wei-zhong,JIN Wei-liang,GAO Ming-zan.Applicability Study on Accelerated Corrosion Methods of Steel Bars in Concrete Structure[J].Journal of Building Structures,2011,32(2):41-47.
[17]GB/T 50152—2012,混凝土结构试验方法标准[S].
GB/T 50152—2012,Standard for Test Method of Concrete Structures[S].
[18]叶涛萍,曹万林,董宏英,等.锈蚀钢筋与高强再生混凝土的黏结性能试验[J].哈尔滨工业大学学报,2018,50(8):132-141.
YE Tao-ping,CAO Wan-lin,DONG Hong-ying,et al.Bond Behavior Between Corroded Steel Bars and High-strength Recycled Concrete[J].Journal of Harbin Institute of Technology,2018,50(8):132-141.
[19]GB 50010—2010,混凝土结构设计规范[S].
GB 50010—2010,Code for Design of Concrete Structures[S].
[20]常彦铮.再生混凝土抗压试验的数值模拟与等效抗压强度折减系数研究[D].西安:西安建筑科技大学,2011.
CHANG Yan-zheng.Study on Reduction Factor of Equivalent Compressive Strength and Numerical Simulation of Compression Test of Recycled Concrete[D].Xi'an:Xi'an University of Architecture and Technology,2011.
[21]GB/T 50082—2009,普通混凝土长期性能和耐久性能试验方法标准[S].
GB/T 50082—2009,Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete[S].

相似文献/References:

[1]肖建庄,黄运标,郑永朝.高温后再生混凝土的残余抗折强度[J].建筑科学与工程学报,2009,26(03):32.
　XIAO Jian-zhuang,HUANG Yun-biao,ZHENG Yong-chao.Residual Flexural Strength of Recycled ConcreteAfter Elevated-temperatures[J].Journal of Architecture and Civil Engineering,2009,26(03):32.
[2]刘 坚,彭林苗,陈盼盼,等.圆钢管约束型钢再生混凝土短柱抗震性能[J].建筑科学与工程学报,2023,40(06):27.[doi:10.19815/j.jace.2022.01078]
　LIU Jian,PENG Linmiao,CHEN Panpan,et al.Seismic performance of circular steel tube confined steel reinforced recycled concrete short columns[J].Journal of Architecture and Civil Engineering,2023,40(03):27.[doi:10.19815/j.jace.2022.01078]

备注/Memo

备注/Memo:

收稿日期:2020-10-09
基金项目:国家自然科学基金项目(51878319,51778272,51608233)
作者简介:延永东(1982-),男,陕西榆林人,副教授,工学博士,博士后,E-mail:yand@ujs.edu.cn。

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更新日期/Last Update: 2021-05-20