Citation

Gong L, Kang C, Wang H, Yang Y, Wang Z. China Saf. Sci. J. 2020; 30(11): 43-52.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.11.007

PMID

unavailable

Abstract

In order to explore service performance of aqueduct in saline cold and arid areas of Northwest China, firstly, finite element simulation analysis of freezing and thawing cycle of aqueduct body was carried out using sequential coupled thermal stress analysis method. Then, freeze-thaw cycle tests were conducted on 3 types of concrete specimens, including reference, antifreeze and early strengthening water reducer, under erosion of Na2SO4 solutions at 4 mass concentrations. The results show that in finite element simulation, as number of freeze-thaw cycles increases, stress and strain values of aqueduct body also increase correspondingly which are mainly concentrated at junction of frozen areas. It is found through tests that quality loss rate and compressive strength loss rate of concrete specimens increase with rise in number of salt freezing, and their damage also gradually intensifies. Under erosion of salt solution at same mass concentration, damage degree of specimen ranks in descending order as antifreeze, reference and early strengthening water reducing agent group. Moreover, salt freezing will cause damage to aqueduct body, and in a long run, it will lead to decline of strength and stability of its structure, therefore affecting service life of water delivery project. © 2020 China Safety Science Journal

Language: zh