摘要
To reveal the deterioration mechanism and service life of concrete durability in the western saline soil area,the indoor accelerated test of the concrete specimen was simulated in the coupled environment of salt erosion and dry-wet cycles in the west saline soil area of China.The deterioration mechanism of concrete durability was revealed through the relative dynamic elastic modulus,relative quality evaluation parameters,SEM,and XRD evaluation indexes.Random Wiener distribution function was used for modeling life prediction.The results show that the relative dynamic elastic modulus evaluation parameter as an evaluation index of concrete durability under various environmental coupling effects is more reliable than the relative quality,there were holes and cracks in the concrete,and needle-like and layered crystals grow from the internal cracks.The corrosion products include ettringite,gypsum and other expansive crystals and non-gelling Mg(OH)_(2);the expansion stress caused by physical,chemical reaction,and temperature change under the action of drywet cycle aggravates the formation and development of cracks.The random Wiener distribution function can describe the degradation process of concrete specimen durability,and the established concrete reliability function can intuitively reflect the service life of concrete specimens.
作者
付勇
乔宏霞
HAKUZWEYEZU Theogene
QIAO Guobin
GUO Fei
FU Yong;QIAO Hongxia;HAKUZWEYEZU Theogene;QIAO Guobin;GUO Fei(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
基金
Funded by National Natural Science Foundation of China(NSFC)(Nos.52178216,51868044)。
