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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (1): 10-19    DOI: 10.3785/j.issn.1008-973X.2021.01.002
    
Experimental study on recycled brick aggregate concrete frame model
Pei GE1(),Wei HUANG1,*(),Meng LI2
1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2. Shanxi Provincial Natural Gas Limited Company, Xi'an 710055, China
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Abstract  

The influence of water cement mass ratio, particle size distribution, recycled brick aggregate and sand volume fraction on the compressive strength of concrete and the influence of cement sand mass ratio on the compressive strength of cement paste were analyzed through experiments. The influence of aggregate cement volume ratio, cement sand mass ratio, recycled brick aggregate and sand volume fraction on the contribution strength of concrete framework was analyzed. Results show that the compressive strength of recycled brick aggregate concrete increases with the decrease of water cement mass ratio, and the compressive strength reaches the maximum value when the aggregate size ranges from 19 to 26.5 mm. The compressive strength of concrete and the contribution strength of recycled brick aggregate framework increase with the increase of recycled brick aggregate volume fraction when the volume fraction of recycled brick aggregate is between 30% and 43.2%, and both of them increase with the increase of sand volume fraction. The compressive strength of cement paste specimen increases with the increase of cement sand mass ratio when the cement sand mass ratio is between 0.33 and 1.33. The cement sand mass ratio is highly linear to the contribution strength of recycled brick aggregate framework, and aggregate cement volume ratio is highly linear to the contribution strength of recycled brick aggregate framework when the volume fraction of recycled brick aggregate is 40% and 43.2%. The contribution strength of recycled brick aggregate framework is higher than that of concrete, mainly concentrated in the recycled brick aggregate volume fraction of 40%-43.2%, especially when the volume fraction of recycled brick aggregate is 43.2% and the volume fraction of sand is 18%-26%.

Key words： recycled brick aggregate concrete      frame contribution strength      aggregate cement volume ratio      cement sand mass ratio      compressive strength     
Received: 28 October 2020      Published: 05 January 2021
CLC:  TU 528  
Corresponding Authors: Wei HUANG     E-mail: 810541715@qq.com;3320194230@qq.com
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Pei GE
Wei HUANG
Meng LI
Cite this article:

Pei GE,Wei HUANG,Meng LI. Experimental study on recycled brick aggregate concrete frame model. Journal of ZheJiang University (Engineering Science), 2021, 55(1): 10-19.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.01.002     OR     http://www.zjujournals.com/eng/Y2021/V55/I1/10


再生砖骨料混凝土架构模型试验研究

通过试验研究水灰质量比、粒径级配、再生砖骨料和砂体积分数对混凝土抗压强度的影响以及灰砂质量比对水泥石抗压强度的影响，分析骨浆体积比、灰砂质量比、再生砖骨料和砂体积分数对混凝土架构贡献强度的影响. 结果表明，再生砖骨料混凝土的抗压强度随着水灰质量比的减小而增大，当骨料粒径为19~26.5 mm时抗压强度达到最大值；当再生砖骨料体积分数为30%~43.2%时，混凝土抗压强度和再生砖骨料构架贡献强度都随着再生砖骨料体积分数的增大而增大，且都随着砂体积分数的增大而增大；当灰砂质量比为0.33~1.33时，水泥砂浆试件的抗压强度随着灰砂质量比的增大而增大；当再生砖骨料体积分数为40%和43.2%时，灰砂质量比与再生砖骨料架构贡献强度以及骨浆体积比与再生砖骨料架构贡献强度均高度线性相关；再生砖骨料架构贡献强度高于混凝土强度，主要集中在再生砖骨料体积分数为40%~43.2%，特别是再生砖骨料体积分数为43.2%、砂体积分数为18%~26%.


关键词： 再生砖骨料混凝土,  架构贡献强度,  骨浆体积比,  灰砂质量比,  抗压强度 
骨料类型 ρa /（kg·m?3） ρc /（kg·m?3） T /% W /%
RBA 2100 1012 22 18.11
NA 2713 1401 10 0.22
Tab.1 Physical properties of aggregate
试件编号 骨料粒径 mc/ms mw/mc ρB /(kg·m?3) $\varphi _{\rm{B}}$
水 水泥 RBA NA 砂 RBA NA 砂
H1 2.36~26.5 0.58 0.63 205 325 0 1309 561 0 0.483 0.213
H2 2.36~26.5 0.71 0.52 205 394 0 1243 558 0 0.458 0.211
H3 2.36~26.5 0.77 0.46 205 446 0 1172 577 0 0.432 0.219
H4 2.36~26.5 0.82 0.41 205 500 0 1085 610 0 0.400 0.231
H5 2.36~26.5 0.58 0.63 205 325 1013 0 561 0.483 0 0.213
H6 2.36~26.5 0.71 0.52 205 394 962 0 558 0.458 0 0.211
H7 2.36~26.5 0.77 0.46 205 446 907 0 577 0.432 0 0.219
H8 2.36~26.5 0.82 0.41 205 500 840 0 610 0.400 0 0.231
H9 19~26.5 0.77 0.46 205 446 907 0 577 0.432 0 0.219
H10 9.5~19 0.77 0.46 205 446 907 0 577 0.432 0 0.219
H11 2.36~9.5 0.77 0.46 205 446 907 0 577 0.432 0 0.219
H12 2.36~26.5 1.35 0.46 294 640 630 0 475 0.300 0 0.180
H13 2.36~26.5 1.02 0.46 272 590 630 0 577 0.300 0 0.220
H14 2.36~26.5 0.79 0.46 249 541 630 0 686 0.300 0 0.260
H15 2.36~26.5 1.22 0.46 266 578 735 0 475 0.350 0 0.180
H16 2.36~26.5 0.92 0.46 243 529 735 0 577 0.350 0 0.220
H17 2.36~26.5 0.70 0.46 220 480 735 0 686 0.350 0 0.260
H18 2.36~26.5 1.09 0.46 237 517 840 0 475 0.400 0 0.180
H19 2.36~26.5 0.81 0.46 215 467 840 0 577 0.400 0 0.220
H20 2.36~26.5 0.61 0.46 193 418 840 0 686 0.400 0 0.260
H21 2.36~26.5 1.00 0.46 220 477 907 0 475 0.432 0 0.180
H22 2.36~26.5 0.55 0.46 174 379 907 0 686 0.432 0 0.260
H23 2.36~26.5 0.83 0.46 181 394 1050 0 475 0.500 0 0.180
H24 2.36~26.5 0.60 0.46 159 344 1050 0 577 0.500 0 0.220
H25 2.36~26.5 0.43 0.46 136 295 1050 0 686 0.500 0 0.260
H26 2.36~26.5 0.70 0.46 153 332 1155 0 475 0.550 0 0.180
H27 2.36~26.5 0.49 0.46 130 283 1155 0 577 0.550 0 0.220
H28 2.36~26.5 0.34 0.46 107 234 1155 0 686 0.550 0 0.260
Tab.2 Test plan of concrete mix proportion
试件编号 mw/mc mc/ms 备注
G1 0.46 0.33 ?
G2 0.46 0.5 ?
G3 0.46 1 ?
G4 0.46 1.33 ?
G5 0.46 2 ?
G6 0.46 4 ?
G7 0.46 ? 纯水泥浆试件
Tab.3 Mix proportion scheme of cement mortar specimen
Fig.1 Compressive strength of concrete with different water cement ratio
Fig.2 Compressive strength of recycled brick aggregate concrete with different gradation
Fig.3 Influence of volume fraction of coarse and fine aggregate on compressive strength
Fig.4 Sketch map of different sand volume fraction
Fig.5 Compressive strength of specimens with different cement sand ratio
Fig.6 Contribution strength of recycled brick aggregate framework
Fig.7 Correlation diagram of aggregate contribution strength of RBA
Fig.8 Contribution strength of recycled brick aggregate framework and concrete strength
Fig.9 Correlation diagram of recycled brick aggregate contribution strength and concrete strength
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