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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (6): 1090-1099    DOI: 10.3785/j.issn.1008-973X.2021.06.009
    
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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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     
Received: 18 July 2020      Published: 30 July 2021
CLC:  TU 375  
Fund:  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）
Corresponding Authors: Yu-xi ZHAO     E-mail: 183274731@qq.com;yxzhao@zju.edu.cn
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Yi-liquan SUN
Yu-xi ZHAO
Tao MENG
Hua-dong WEI
Yun-cai ZHANG
Cite this article:

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.

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


再生砖混骨料混凝土柱的小偏心受压性能

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 
Fig.1 Recycled brick-mixed aggregate
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
Tab.1 Basic properties of aggregate
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
Tab.2 Mixing ratio of recycled brick-mixed aggregate concrete
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
Tab.3 Mixing ratio of natural aggregate concrete
钢筋牌号 dre /mm fy /MPa fst /MPa δgt /%
HRB400 12 502 578 28
HRB400 8 435 630 21
Tab.4 Reinforced tensile test results
Fig.2 Dimensions and reinforcement details of specimens
Fig.3 Layout of measuring point
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
Tab.5 Specimen design of column
Fig.4 Loading device of column under small eccentric compression
Fig.5 Failure characteristics of columns
Fig.6 Lateral deflection distribution of column
Fig.7 Cures of vertical load to span deflection
Fig.8 Cures of vertical load to compression strain in midspan
Fig.9 Cures of vertical load to reinforcement strain
Fig.10 Cures of concrete strain
Fig.11 Test results of cracking load
Fig.12 Process of column construction
Fig.13 Test results of ultimate load
Fig.14 Diagram of calculation of bearing capacity of column under small eccentric compression
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
Tab.6 Comparison between test and calculation results of ultimate load
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