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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (6): 1090-1099    DOI: 10.3785/j.issn.1008-973X.2021.06.009
交通工程、土木工程     
再生砖混骨料混凝土柱的小偏心受压性能
孙一李全1(),赵羽习1,*(),孟涛1,韦华栋1,张云财2
1. 浙江大学 建筑工程学院，浙江 杭州 310000
2. 舟山金科资源再生有限公司，浙江 舟山 316000
Small eccentric compression performance of reinforced concrete column made with recycled brick-mixed aggregate
Yi-liquan SUN1(),Yu-xi ZHAO1,*(),Tao MENG1,Hua-dong WEI1,Yun-cai ZHANG2
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310000, China
2. Zhoushan Jinke Resources Recycling Limited Company, Zhoushan 316000, China
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摘要：

通过小偏心受压性能试验对比研究3根的天然骨料混凝土柱和3根同强度全再生砖混骨料混凝土柱，强度分别为C25、C30和C35. 对6根柱进行加载试验，分析再生砖混骨料混凝土柱相比于同强度天然骨料混凝土柱在受力过程、破坏特征、变形能力与承载力等方面的差异. 试验发现，再生砖混骨料混凝土柱在小偏心加载至破坏的过程中，具有与天然骨料混凝土柱相似的3个受力阶段，且符合平截面假定. 与同强度的天然骨料混凝土柱相比，变形较大，但再生砖混骨料混凝土柱的极限承载力略高，原因可能在于两者轴心抗压强度的差异.
关键词： 再生骨料混凝土柱;  砖骨料;  全取代率;  小偏心受压;  受力性能    
Abstract:

Three columns made with natural aggregate concrete (NAC column) and three columns made with recycled aggregate concrete containing waste concrete and bricks (RAC column) with strengths of C25, C30, C35 were designed. A small eccentric compression performance test was conducted on six columns to analyze the differences in the stress process, failure characteristics, deformability and bearing capacity between RAC columns and NAC columns of the same strength. In the process of loading to failure, the RAC column shows three stress stages similar to the NAC column, which also accords with the plane section assumption. The deformation of the RAC column is larger compared with the NAC column of the same strength. The ultimate bearing capacity of RAC column is slightly higher, which may be due to the difference in axial compressive strength.
Key words: recycled aggregate concrete column    brick    total replacement rate    small eccentric compression    mechanical performance
收稿日期: 2020-07-18 出版日期: 2021-07-30
CLC:  TU 375  
基金资助: 浙江省重点研发计划资助项目（2020C04013）；舟山市科技计划资助项目（2019C21052）
通讯作者: 赵羽习     E-mail: 183274731@qq.com;yxzhao@zju.edu.cn
作者简介: 孙一李全（1994—），男，硕士生，从事再生混凝土结构的研究. orcid.org/0000-0001-7024-5829. E-mail： 183274731@qq.com
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孙一李全
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张云财

引用本文:

孙一李全,赵羽习,孟涛,韦华栋,张云财. 再生砖混骨料混凝土柱的小偏心受压性能[J]. 浙江大学学报(工学版), 2021, 55(6): 1090-1099.

Yi-liquan SUN,Yu-xi ZHAO,Tao MENG,Hua-dong WEI,Yun-cai ZHANG. Small eccentric compression performance of reinforced concrete column made with recycled brick-mixed aggregate. Journal of ZheJiang University (Engineering Science), 2021, 55(6): 1090-1099.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.06.009    或    https://www.zjujournals.com/eng/CN/Y2021/V55/I6/1090

图 1  再生砖混骨料
骨料 dag /mm wbr /% ρ /(kg·m?3) ρL /(kg·m?3) wwa,2h /% wwa,24h /% δa /%
天然细骨料 0~4.5 ? 2630 1440 ? 0.81 ?
天然粗骨料 4.5~31.5 ? 2730 1420 ? 0.93 ?
再生砖混细骨料 0~10.0 20 2410 1120 10.1 13.20 22
再生砖混中骨料 10.0~16.0 21.89 2480 1070 8.0 9.10 21
再生砖混粗骨料 16.0~32.0 12.89 2500 1110 7.9 8.70 18
表 1  骨料基本性能
混凝土编号 mw /kg mc /kg m1 /kg m2 /kg m3 /kg ma /kg S /mm fcu,28 /MPa 强度评级
R-C25 323.0 397.2 995.2 92.7 618.2 7.149 155 29.4 C25
R-C30 317.9 469.0 962.7 89.7 598.0 8.442 170 35.4 C30
R-C35 311.9 553.4 924.4 86.1 574.2 9.962 180 40.6 C35
表 2  再生砖混骨料混凝土配合比
混凝土编号 mw /kg mc /kg m4 /kg m5 /kg ma /kg S /mm fcu,28 /MPa 强度评级
N-C25 172.4 252.0 988.1 988.1 2.520 150 28.8 C25
N-C30 161.2 280.5 990.9 990.9 2.805 170 36.0 C30
N-C35 150.0 302.7 996.5 996.5 3.207 160 41.1 C35
表 3  天然骨料混凝土配合比
钢筋牌号 dre /mm fy /MPa fst /MPa δgt /%
HRB400 12 502 578 28
HRB400 8 435 630 21
表 4  钢筋拉伸试验结果
图 2  柱试件尺寸与配筋图
图 3  测点布置图
柱编号 混凝土类型 fcu,28 /MPa 强度评级 e0 /mm
C-R-C25 R-C25 29.4 C25 50
C-R-C30 R-C30 35.4 C30 50
C-R-C35 R-C35 40.6 C35 50
C-N-C25 N-C25 28.8 C25 50
C-N-C30 N-C30 36.0 C30 50
C-N-C35 N-C35 41.1 C35 50
表 5  柱试件设计
图 4  柱小偏心受压试验加载装置
图 5  试验柱的破坏特征
图 6  柱侧向挠度分布
图 7  荷载-跨中侧向挠度曲线
图 8  竖向荷载-跨中受压应变曲线
图 9  竖向荷载-钢筋应变曲线
图 10  混凝土应变曲线
图 11  开裂荷载试验值
图 12  柱施工过程示意图
图 13  极限荷载试验值
图 14  小偏心受压柱承载力的计算简图
柱编号 fcu,28 /MPa Pte /kN Pca /kN Pte /Pca
C-R-C25 29.4 623.0 555.3 1.12
C-R-C30 35.4 714.4 652.5 1.09
C-R-C35 40.6 791.9 719.8 1.10
表 6  极限荷载计算值与试验值对比
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