Effect of sulfate erosion on the bonding performance of CFRP-clay brick interface
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摘要: 为探究硫酸盐浸泡环境下碳纤维增强复合材料(CFRP)-粘土砖界面粘结性能退化规律,试验采用质量分数为10wt%的硫酸盐溶液对CFRP-粘土砖试件进行加速腐蚀,并对材料性能进行测定,通过采集应变、承载力等参数,分析CFRP与粘土砖界面承载力能力与粘结强度变化规律。研究表明:硫酸浸泡对CFRP片材和树脂胶的力学性能无显著影响,但对粘土砖的抗压强度有明显影响,经过180天硫酸盐浸泡后,粘土砖抗压强度下降了34.50%。对于CFRP-粘土砖界面的极限承载力与粘结强度,研究发现CFRP的宽度对界面承载力和粘结强度均有影响,增加界面的宽度,可以增加界面的承载能力,但界面粘结强度会因此而下降,且粘结宽度越大,在硫酸盐持续浸泡作用下界面粘结性能退化越显著。在试验基础上引入硫酸盐综合影响系数,并对其采用两种不同方式进行计算,建立考虑硫酸盐浸泡影响的CFRP-粘土砖界面承载力关系模型,通过与试验值对比,本文提出的CFRP-粘土砖界面承载力能关系模型能够很好地预测硫酸盐持续浸泡对CFRP-粘土砖界面承载力退化情况。
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关键词:
- 硫酸盐环境 /
- 碳纤维增强树脂复合材料(CFRP)-粘土砖 /
- 单面剪切 /
- 极限承载力 /
- 粘结强度
Abstract: In order to investigate the degradation law of bonding performance of carbon fiber reinforced composite (CFRP)-clay brick interface under sulfate soaking environment, the test was conducted by accelerated corrosion of CFRP-clay brick specimens with 10wt% mass fraction of sulfate solution, and the material properties were measured, and the change law of bearing capacity and bonding strength of CFRP-clay brick interface was analyzed by collecting the parameters of strain and bearing capacity. The study shows that sulfuric acid immersion has no significant effect on the mechanical properties of CFRP sheet and resin adhesive, but has a significant effect on the compressive strength of clay brick, which decreases by 34.50% after 180 days sulfate immersion. For the ultimate bearing capacity and bond strength of CFRP-clay brick interface, it is found that the width of CFRP has an effect on both the bearing capacity and bond strength of the interface, increasing the width of the interface can increase the bearing capacity of the interface, but the bond strength of the interface will decrease as a result, and the larger the bond width is, the more significant the degradation of the bond performance of the interface under the effect of continuous sulfate immersion. Based on the test, the comprehensive influence coefficient of sulfate is introduced and calculated in two different ways to establish the CFRP-clay brick interfacial bearing capacity relationship model considering the influence of continuous sulfate soaking. The model can predict the degradation of the CFRP-clay brick interface by continuous sulfate soaking. -
图 11 不同粘结宽度CFRP-粘土砖极限承载力与硫酸盐侵蚀时间的关系曲线
Figure 11. Ultimate bearing capacity and sulfate immersion cycle relationship curves of CFRP-clay brick specimens with different bond widths
Pu(x)/Pu(0)—Ratio of the ultimate load capacity of the specimen under different sulfate immersion cycles to the ultimate load capacity under room temperature conditions
表 1 两种粘结宽度试件承载能力与粘结强度的变化幅度
Table 1. 1Changes of bearing capacity and bond strength of specimens with two bond widths
Soaking cycle/d Average ultimate bearing capacity/kN Change/% Average bond strength/MPa Change/% 70mm wide specimen 50mm wide specimen 70mm wide specimen 50mm wide specimen 0 16.37 12.05 -26.4 228.1 240.9 +5.3 30 14.12 10.63 -24.7 201.7 212.6 +5.1 60 12.96 10.31 -18.1 185.1 206.2 +12.8 90 12.11 10.14 -16.3 173.0 202.7 +14.7 120 11.54 9.67 -16.2 164.9 193.5 +14.8 150 10.87 9.32 -14.2 155.3 186.4 +16.7 180 10.23 8.85 -13.5 146.1 177.0 +17.5 Note: “-” represents a decrease, “+”represents an increase. 表 1 硫酸盐浸泡下CFRP和树脂胶力学性能
Table 1. Mechanical properties of CFRP and resin adhesive under sulfate immersion
Material Soaking
cycle/dTensile
strength/MPaChange/% Modulus of
elasticity/GPaChange/% Elongation/% Change/% CFRP 0 3573 — 264.8 — 1.666 — 30 3557 −0.45 263.2 −0.60 1.645 −1.26 60 3518 −1.54 262.9 −0.72 1.630 −2.16 90 3485 −2.46 261.8 −1.13 1.612 −3.24 120 3463 −3.08 260.9 −1.47 1.604 −3.72 150 3447 −3.53 260.5 −1.62 1.593 −4.38 180 3427 −4.09 259.6 −1.96 1.589 −4.62 Resin glue 0 58.917 — 2707 — 2.294 — 30 59.006 +0.15 2770 +2.33 2.354 +2.62 60 57.926 −1.68 2628 −2.92 2.254 −1.74 90 57.434 −2.52 2639 −2.51 2.241 −2.31 120 55.983 −4.98 2610 −3.58 2.205 −3.88 150 55.794 −5.30 2604 −3.80 2.202 −4.01 180 55.262 −6.20 2589 −4.36 2.165 −5.62 Notes: The magnitude of change is compared with the results under 0 immersion cycles (room temperature conditions); “−”—Decrease; “+”—Increase. 表 2 各浸泡周期下CFRP-粘土砖试件基本参数及试验结果
Table 2. Basic parameters and test results of CFRP-clay brick specimens under each immersion cycle
Soaking
cycle/dBonding
width/mmSpecimen
numberUltimate
load/kNAverage
ultimate load/kNBond
strength/MPaAverage bond
strength/MPa0 50 0-150×50-1 12.26 12.05 245.2 240.9 0-150×50-2 11.32 226.4 0-150×50-3 12.56 251.2 70 0-150×70-1 15.39 16.37 219.9 228.1 0-150×70-2 17.14 248.6 0-150×70-3 15.11 215.9 30 50 30-150×50-1 11.78 10.63 235.6 212.6 30-150×50-2 9.14 182.8 30-150×50-3 10.97 219.4 70 30-150×70-1 15.16 14.12 216.6 201.7 30-150×70-2 14.05 200.7 30-150×70-3 13.15 187.9 60 50 60-150×50-1 9.19 10.31 183.8 206.2 60-150×50-2 12.02 240.4 60-150×50-3 9.72 194.4 70 60-150×70-1 11.03 12.96 157.6 185.1 60-150×70-2 13.21 188.7 60-150×70-3 14.64 209.1 90 50 90-150×50-1 10.24 10.14 204.8 202.7 90-150×50-2 9.51 190.2 90-150×50-3 10.66 213.2 70 90-150×70-1 12.19 12.11 174.1 173.0 90-150×70-2 10.62 151.7 90-150×70-3 13.52 193.1 120 50 120-150×50-1 8.85 9.67 177.0 193.5 120-150×50-2 9.51 190.2 120-150×50-3 10.66 213.2 70 120-150×70-1 11.68 11.54 166.9 164.9 120-150×70-2 12.20 174.3 120-150×70-3 10.74 153.4 150 50 150-150×50-1 8.76 9.32 175.2 186.4 150-150×50-2 9.65 193.0 150-150×50-3 9.55 191.0 70 150-150×70-1 11.42 10.87 163.1 155.3 150-150×70-2 10.97 156.7 150-150×70-3 10.22 146.0 180 50 180-150×50-1 8.91 8.85 178.2 177.0 180-150×50-2 9.17 183.4 180-150×50-3 8.47 169.4 70 180-150×70-1 10.77 10.23 153.8 146.1 180-150×70-2 9.59 137.0 180-150×70-3 10.33 147.6 Notes: Specimen number is soaking cycle - bond length × bond width - number of specimens; The change is compared with the results under 0 soaking cycles (room temperature conditions). 表 3 两种粘结宽度CFRP-粘土砖试件承载能力与粘结强度的变化幅度
Table 3. Changes of bearing capacity and bond strength of CFRP-clay brick specimens with two bond widths
Soaking
cycle/dAverage ultimate bearing capacity/kN Change/% Average bond strength/MPa Change/% 70 mm wide specimen 50 mm wide specimen 70 mm wide specimen 50 mm wide specimen 0 16.37 12.05 −26.4 228.1 240.9 +5.3 30 14.12 10.63 −24.7 201.7 212.6 +5.1 60 12.96 10.31 −18.1 185.1 206.2 +12.8 90 12.11 10.14 −16.3 173.0 202.7 +14.7 120 11.54 9.67 −16.2 164.9 193.5 +14.8 150 10.87 9.32 −14.2 155.3 186.4 +16.7 180 10.23 8.85 −13.5 146.1 177.0 +17.5 表 4 室温条件下不同粘结宽度CFRP-粘土砖试件的剥离承载力
Table 4. Peel bearing capacity of CFRP-clay brick specimens with different bond widths under standard maintenance conditions
Compressive strength of
clay bricks/MPaCFRP length/mm CFRP width/mm Test value/kN Calculated value/kN Ratio 17.39 150 30 7.62 7.72 0.987 150 50 12.05 12.21 0.987 150 70 16.37 16.58 0.987 150 90 20.69 20.94 0.988 表 5 硫酸盐各浸泡周期下CFRP-粘土砖极限承载力计算结果与试验结果对比
Table 5. Comparison between calculated and experimental results of ultimate bearing capacity of CFRP-clay brick under each soaking cycle of sulfate
Soaking
cycle/d70 mm width specimen 50 mm width specimen Test results/kN Method 1
calculation
results/kNMethod 2
calculation
results/kNTest results/kN Method 1
calculation
results/kNMethod 2 calculation results/kN 0 16.37 16.13 16.30 12.05 12.15 12.16 30 14.12 14.30 14.81 10.63 11.32 11.05 60 12.96 12.89 13.63 10.31 10.63 10.17 90 12.11 11.82 12.70 10.14 10.07 9.48 120 11.54 11.02 11.99 9.67 9.61 8.94 150 10.87 10.45 11.45 9.32 9.25 8.54 180 10.23 10.08 11.08 8.85 8.98 8.27 -
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