TY - JOUR
T1 - Influence of stochastic cracks on sulfate diffusion in concrete of underground structure
AU - Liu, Weiqing
AU - Liu, Xin
AU - Wang, Shuguang
AU - Du, Dongsheng
PY - 2013/12
Y1 - 2013/12
N2 - The influence of the stochastic crack width on sulfate diffusion coefficient and concentration in underground concrete was investigated. It is assumed that the crack is composed of crack elements, and the probability density function of crack element location along longitudinal direction of the crack follows the normal distribution. The rule of sulfate diffusion coefficient in cracking concrete varying with the cracks width was deduced. Based on Fick's second law, a modified diffusion equation was presented, and the numerical simulation was conducted with two crack shape parameters. The results showed that in both cases the sulfate ion concentration reached a steady state within 50 h. The small crack shape parameter and irregular crack shape slowed down the diffusion rate and the time for steady concentration.
AB - The influence of the stochastic crack width on sulfate diffusion coefficient and concentration in underground concrete was investigated. It is assumed that the crack is composed of crack elements, and the probability density function of crack element location along longitudinal direction of the crack follows the normal distribution. The rule of sulfate diffusion coefficient in cracking concrete varying with the cracks width was deduced. Based on Fick's second law, a modified diffusion equation was presented, and the numerical simulation was conducted with two crack shape parameters. The results showed that in both cases the sulfate ion concentration reached a steady state within 50 h. The small crack shape parameter and irregular crack shape slowed down the diffusion rate and the time for steady concentration.
KW - Concrete of underground structure
KW - Diffusion coefficient
KW - Ion concentration distribution
KW - Stochastic crack width
UR - http://www.scopus.com/inward/record.url?scp=84891922614&partnerID=8YFLogxK
U2 - 10.3969/j.issn.0258-2724.2013.06.005
DO - 10.3969/j.issn.0258-2724.2013.06.005
M3 - 文章
AN - SCOPUS:84891922614
SN - 0258-2724
VL - 48
SP - 996
EP - 1001
JO - Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University
JF - Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University
IS - 6
ER -