Durability evaluation of concrete in alpine salt marsh area based on gray system theory

FENG Zhong-ju; CHEN Si-xiao; XU Hao; YAO Xian-hua

doi:10.19818/j.cnki.1671-1637.2018.06.003

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FENG Zhong-ju, CHEN Si-xiao, XU Hao, YAO Xian-hua. Durability evaluation of concrete in alpine salt marsh area based on gray system theory[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 18-26. doi: 10.19818/j.cnki.1671-1637.2018.06.003

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FENG Zhong-ju, CHEN Si-xiao, XU Hao, YAO Xian-hua. Durability evaluation of concrete in alpine salt marsh area based on gray system theory[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 18-26. doi: 10.19818/j.cnki.1671-1637.2018.06.003

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Durability evaluation of concrete in alpine salt marsh area based on gray system theory

doi: 10.19818/j.cnki.1671-1637.2018.06.003

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Supervision Bureau of Traffic Construction Quality and Safety of Fujian Province, Fuzhou 350001, Fujian, China
3.
School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450011, Henan, China

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Author Bio:
FENG Zhong-ju(1965-), male, professor, PhD, ysf@gl.chd.edu.cn
Corresponding author: CHEN Si-xiao(1984-), male, doctoralstudent, csx985@163.com
Received Date: 2018-07-21
Publish Date: 2018-12-25

Abstract

Abstract

Based on the project of Qinghai Dexiang Highway, the evolution process and characteristics of the concrete's dynamic elastic modulus under the coupling effect of freezingthawing dry-wet cycle and salt corrosion were analyzed through the indoor damage test.Based on the grey system theory, the GM (1, 1) prediction models of the concrete's relative dynamic elastic modulus were established under different conditions, and the durabilities of the concretes with three mix ratios under two damage conditions were predicted by using the prediction models.According to the indoor damage test result and the prediction results of the GM (1, 1) models, thecompositions of the concrete were analyzed, and the influence of different mixtures on the durability of the concrete was studied.Research result shows that the relative errors of the prediction models for the concrete durability are within 6%, the posterior difference ratio is less than 0.35, and the small probability error is more than 0.95. Therefore, the prediction accuracy is higher.The durability of concrete varies greatly under different working conditions, and the effect degree of composite salt corrosion-curing freezing-thawing cycles is 42.8%-46.2% higher than the value of composite salt corrosion-immersion freezing-thawing cycles.The durability of the concrete mix proportion Ⅲ with fly ash, silica fume and expansive agent is the best and 50% higher than the value of standard mix proportion.Therefore, in order to ensure the durability of the concrete, the concrete mix proportion Ⅲ can be used as a reference in site concrete mix proportion design in similar areas.The simultaneous use of fly ash and slag will produce ettringite, which can seriously affect the durability of concrete.Compared with the reference mix ratio, the durability reduction rates of the concrete are more than 50% under different mix proportions.
- geotechnical engineering,
- concrete,
- durability,
- alpine salt marsh area,
- GM (1, 1) model,
- multi-factor coupling effect,
- relative dynamic elastic modulus

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References

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Durability evaluation of concrete in alpine salt marsh area based on gray system theory

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