Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 494-505.doi: 10.13229/j.cnki.jdxbgxb.20220414

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Corrosion deterioration and equivalent relationship between natural exposure and salt spray accelerated environment of reinforced concrete

Qiong FENG1(),Hao-zheng TIAN1,Hong-xia QIAO1,2(),Teng-fei NIAN1,Wen-wen HAN1   

  1. 1.School of Civil Engineering，Lanzhou University of Technology，Lanzhou 730050，China
    2.Western Ministry of Civil Engineering Disaster Prevention and Mitigation Engineering Research Center，Lanzhou University of Technology，Lanzhou 730050，China
  • Received:2022-04-14 Online:2024-02-01 Published:2024-03-29
  • Contact: Hong-xia QIAO E-mail:fengqiong.1985@163.com;qhxlut7706@163.com

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Abstract:

In view of the problem of serious disease in the western saline soil region， this paper selects a typical environment in the western saline soil region to carry out natural exposure test of reinforced concrete， and simulates the local corrosion environment to design indoor salt spray dry and wet cycle acceleration test. The corrosion current density and concrete damage degree were used to characterize the deterioration laws of reinforcement and protective layer. Based on Weibull distribution function， the deterioration model of reinforced concrete under the two environments were established， and the competitive failure analysis was carried out. Finally， the equivalent relationship between the two environments were established by using the equivalent condition of reliability and the concept of equivalent. The results show that the deterioration law of reinforced concrete under in indoor acceleration is similar to that under natural exposure， and the laws are the result of the interaction of strengthening and deterioration effects. The Weibull distribution function can effectively describe the deterioration process of reinforced concrete under indoor acceleration and natural exposure environment. The time of internal reinforcement deterioration to median life is slightly earlier than that of the concrete protective layer. Indoor salt spray dry and wet cycles accelerated deterioration of reinforced concrete for 1 day can simulate 12.7 days of natural exposure deterioration in saline soil region.

Key words: civil engineering material, reinforced concrete, western saline soil region, corrosion deterioration, Weibull distribution functions, equivalence relations

CLC Number: 

  • TU528.1

Table 1

Chemical composition of cementitious materials"

材料SiO2Fe2O3Al2O3CaOMgOTiO2SO3K2OMnOIL
水泥26.34.410.649.23.21.02.01.20.41.7
粉煤灰45.46.630.28.91.81.31.91.50.22.2

Table 2

Mix proportion of concrete"

材料含量材料含量
水泥315水158
细骨料634粉煤灰135
粗骨料1167减水剂适量

Fig.1

Schematic diagram of reinforced concrete specimen"

Table 3

Soluble salt composition in saline soil areas of Golmud， Qinghai"

成分CO32-HCO3-SO42-Cl-Ca2+Mg2+Na++K+
离子含量/（mg·kg-1）591811564881016584039722887

Table 4

Correspondence between corrosion current density and corrosion rate of steel bars"

icorr/ （μA·cm-2）icorr<0.20.2≤icorr<0.50.5≤icorr<1.01.0≤icorr<1010≤icorr
腐蚀速率状态

钝化

状态

低中等高极高

Fig.2

Polarization curves under dry and wet cycles of salt spray"

Fig.3

Polarization curves under natural exposure to decay environment"

Fig.4

Evolution pattern of icorr with the number of wet and dry cycles"

Fig.5

Evolution pattern of icorr with exposure time"

Fig.6

Evolution of Dt with the number of wet and dry cycles"

Fig.7

Evolution of Dt with exposure corrosion time"

Fig.8

Hypothesis test of Dt under wet and dry cycles of salt spray"

Fig.9

Hypothesis test of Dt under natural exposure"

Fig.10

Hypothesis testof icorr under the wet and dry cycles of salt spray"

Fig.11

Hypothesis testof icorr under natural exposure"

Fig.12

Regression analysis results of Dt under dry and wet cycles of salt spray"

Fig.13

Regression analysis of Dt under natural exposure"

Fig.14

Regression analysis results of icorr under the dry and wet cycles of salt spray"

Fig.15

Regression analysis results of icorr under natural exposure"

Table 5

Parameter estimation results"

相关参数混凝土损伤度腐蚀电流密度
干湿循环自然暴露干湿循环自然暴露
m2.2753.1763.8015.325
θ173.53068.6167.71917.3

Fig.16

Reliability function curve of Dtunder dry and wet cycles of salt spray"

Fig.17

Reliability function curve of Dt under natural exposure"

Fig.18

Reliability function curve of icorr under dry and wet cycles of salt spray"

Fig.19

Reliability function curve of icorr under natural exposure"

Fig.20

Competitive failure under dry and wet cycles of salt spray"

Fig.21

Competitive failure under natural exposure"

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