Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (5): 1368-1376.doi: 10.13229/j.cnki.jdxbgxb.20230002

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Experiment on interfacial bonding performance between CFRP and clay brick under sulfate attack of wetting-drying cycles

Wen-qiang JIN1,2(),Jia-yuan HU1,Qi WANG3,Chao-peng LI1,Yong-hui YU1,Jia-wei ZHANG1,2   

  1. 1.School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China
    2.National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control，Lanzhou Jiaotong University，Lanzhou 730070，China
    3.China Railway Design Corporation，Tianjin 300308，China
  • Received:2023-01-04 Online:2024-05-01 Published:2024-06-11

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Abstract:

A double-sided shear test was carried out on the sintered clay brick block bonded with carbon fiber reinforced composite material （CFRP） to investigate the failure morphology and bonding properties of the CFRP-clay brick block interface under different sulfate dry-wet cycles， and the sulfate corrosion was discussed. Under the degradation mechanism of CFRP-clay brick interface bond performance， a bond strength degradation model is proposed. The results show that the failure morphology of the CFRP-clay brick block interface is greatly affected by the sulfate dry-wet cycle； the interface bonding properties （ultimate load-bearing capacity， peak shear stress） first slightly increase with the cycle time and then decrease rapidly. On this basis， according to the existing interface theory， a CFRP-clay brick block interface bond-slip model affected by the cycle time is proposed. The predicted value of the model is compared and analyzed with the experimental data. The model can accurately express the impact the law of degradation of interfacial bonding properties caused by sulphate dry-wet cycles.

Key words: sulfate, carbon fibre reinforced plastics, clay brick, interface, bonding-slip relationship

CLC Number: 

  • TB332

Table 1

Main performance parameters of CFRP"

纤维抗拉强度/MPa弹性模量/GPa延伸率/%厚度/mm
CFRP35002201.4580.111

Table 2

Main performance parameters of the resin"

树脂拉伸剪切强度/MPa拉伸强度/GPa压缩强度/MPa弯曲强度/MPa正拉粘结强度/MPa弹性模量/MPa伸长率/%
浸渍胶24.2940.1273.6272.954.442 605.72.45

Fig.1

CFRP-clay brick block specimen production"

Fig.2

Strain gauge sticking specimen and schematic diagram"

Fig.3

CFRP-clay brick block test data acquisition system and loading device"

Fig.4

Schematic diagram of loading device"

Fig.5

CFRP-brick interface failure modes"

Table 3

Average value of ultimate bearing capacity of block and compressive strength of clay brick under different times of sulfate dry-wet cycle"

序号循环次数/次砌体破坏荷载平均值/kN破坏荷载下降比例/%黏土砖抗压强度平均值/MPa抗压强度下降比例/%
1029.130.0016.540.00
22031.457.9917.676.83
34034.0516.9219.1115.53
46028.84-0.9816.42-0.73
58026.96-7.4215.54-6.05

Fig.6

Time-varying curve of compressive strength of block and interface failure load"

Fig.7

Typical strain curve of CFRP-clay brick block"

Fig.8

Bonding-slip curves of clay bricks under different sulfate drying and wetting cycles"

Fig.9

Relationship between the interface characteristic values and the sulfate dry-wet cycles"

Table 4

Interface ductility parameters under different sulfate cycle times"

循环次数/次抗压强度平均值/MPa延性参数计算
016.546.683
2017.676.652
4019.116.600
6017.426.660
8015.546.706

Fig.10

Comparison of predicted and experimental values"

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