Open AccessChloride ion Erosion of Cracked Concrete under Load
Author(s) -
Zhang Yun-guo,
Ying Han,
Junjun Zhang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/3/032034
Subject(s) - chloride , materials science , cracking , composite material , erosion , wedge (geometry) , metallurgy , geology , paleontology , physics , optics
In order to study the effect of load on chloride ion erosion before cracking, cracking critical state and instability failure state, three-point bending beam fracture test was carried out. The specimens were loaded at three loading levels: pre-crack load, crack load and peak load, then chloride ion content in the cracked section of the concrete was measured by borehole sampling method after immersion in 8% sodium chloride solution for 30,60,90 days. The test results show that at the same depth of cracking section, the content of chlorine ion increases with the load level. The chloride ion content with wedge erosion is significantly higher than that without wedge erosion under the same conditions and the increasing trend of chloride ion content under peak load is more significant. The chloride diffusion coefficient decreases with erosion time when the load is less than the initiation load, and chloride ion diffusion coefficient increases slowly with erosion time when load is greater than the initiation load. The stress intensity factor of concrete is positively correlated with chloride ion diffusion coefficient.