盐渍土通电环境中钢筋混凝土损伤劣化及尺寸效应试验研究

doi:10.11896/cldb.20040142

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Abstract Aiming at the prominent durability problem of concrete structures in western saline soil area under the combined action of current and corrosion ion, the constant current electrified acceleration test was designed. At the same time, considering the influence of specimen size, the 100 mm×100 mm×100 mm cube and 100 mm×100 mm×400 mm prismatic specimens were placed in saline soil for durability test. Electrochemical method was adopted for corrosion monitoring. Crack observation instrument was used to pay close attention to the development of cracks. After the end of corrosion, the concrete and steel were respectively scanned by electron microscopy. The results show that, under the condition of saline soil electrified acceleration, the reinforced concrete has gone through four stages:dulling, free expansion, stress growth and crack development. There are laminar, cluster and granular loose structures on the surface of the steel bar, and the corrosion products are black and brown. There are needle rod shaped, ice like and chip shaped crystals in the concrete, and the cracks are developed and distributed along the longitudinal direction around the steel bar. The corrosion potential, corrosion current density and crack development width of cube specimens are significantly higher than those of prism specimens, and the actual corrosion efficiency of cube specimens is 1.5—1.6 times of prism specimens. The size effect of reinforced concrete specimens is significant, the higher the strength level, the more obvious the size effect. The effect of size effect on its durability is higher than the strength level for the ordinary strength grade reinforced concrete.

Key words： reinforced concrete saline soil electrified acceleration size effect damage degradation

Published: Online: 2021-09-07

CLC number:

TU528

Fund:National Natural Science Foundation of China (51168031, 51868044).

About author: Chenggong Lu, Ph. D. candidate of Lanzhou University of Technology, is mainly engaged in the research of concrete durability and life prediction.
Hongxia Qiao, professor and doctoral supervisor of Lanzhou University of Technology, postdoctoral of Qinghai Salt Lake Research Institute, Chinese Academy of Sciences, is mainly engaged in the research of concrete durability and life prediction. She has presided over three National Natural Science Foundation Projects, completed three key scientific and technological projects in Gansu province, one Hongliu excellent young teacher training program of Lanzhou University of technology, one open fund of Key Laboratory of Chinese Academy of Sciences, several large enterprise technology development projects, and participated in a number of provincial and ministerial level courses and national key basic research and development plan (973), with more than 30 SCI/EI searches.

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Cite this article:

LU Chenggong,WEI Zhiqiang,QIAO Hongxia, et al. Research on Damage Deterioration and Size Effect of Reinforced Concrete in Saline Soil Powered-on Environment[J]. Materials Reports, 2021, 35(16): 16042-16049.

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http://www.mater-rep.com/EN/10.11896/cldb.20040142 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16042

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