Weibull durability life prediction method of reinforced concrete in environment of coupled salt solution

LI Kan; WEI Zhiqiang; QIAO Hongxia; LU Chenggong; GUO Jian; HUANG Shangpan

doi:10.13801/j.cnki.fhclxb.20201021.001

Volume 38 Issue 7

Jul. 2021

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LI Kan, WEI Zhiqiang, QIAO Hongxia, et al. Weibull durability life prediction method of reinforced concrete in environment of coupled salt solution[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2370-2382. doi: 10.13801/j.cnki.fhclxb.20201021.001

Citation:

LI Kan, WEI Zhiqiang, QIAO Hongxia, et al. Weibull durability life prediction method of reinforced concrete in environment of coupled salt solution[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2370-2382. doi: 10.13801/j.cnki.fhclxb.20201021.001

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Weibull durability life prediction method of reinforced concrete in environment of coupled salt solution

doi: 10.13801/j.cnki.fhclxb.20201021.001

LI Kan¹,
WEI Zhiqiang^{1, 2},
QIAO Hongxia^{1, 3
,
,},
LU Chenggong¹,
GUO Jian^1
,,
HUANG Shangpan²

1.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
3.
Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China

Received Date: 2020-08-10
Accepted Date: 2020-10-07

Available Online: 2020-10-21

Publish Date: 2021-07-15

Abstract

Abstract

According to the service environment of the platform along Lanzhou Metro Line, coupled salt solutions containing SO₄²⁻, Cl⁻and Mg²⁺ were allocated. The reinforced concrete specimens were placed in a coupled salt solution for nondestructive testing every 90 days. Weibull distribution model was selected. Fixed and dynamic parameter estimates of the degradation distribution were obtained by least square method and BLUE method. The results show that the corrosion ions in coupled salt solution reach the surface of steel bar by diffusion, permeation and electrochemical migration. The pH value near the steel bar decreases, and the passivation film transits from undamaged state to partial damaged state. The polarization curve moves towards the direction of negative potential and increasing corrosion current density, and the AC impedance graph shows a double capacitive reactance arc, while the low-frequency impedance arc radius gradually decreases and contracts to the real part of the impedance. The reliability curves show three-stage variation characteristics. Among the dynamic parameter estimates, the reliability life of the cubic scale parameter is the closest to that of the fixed parameter value, the failure rate is the largest, the reliability life of the exponential scale parameter is the shortest, the failure rate is the smallest, the power type is between the two, and the dynamic parameter function must be between them. The first derivative and the value of the function must be positive. Otherwise, the result of the reliability calculation is complex. The influence of the scale parameter function form on reliability curve is greater than that of the shape parameter function form on reliability curve. When the scale parameter function type is fixed, the shape parameter function type has great influence on the life result. However, the reliability curve changes obviously with the scale parameter function type altering.
- Weibull distribution,
- parameter estimation,
- least square method,
- reinforced concrete,
- reliability,
- life prediction
Long Abstrsct
Innovation Points

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References(26)

References

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