|Table of Contents|

Numerical simulation of expansion equivalent stress in cement-based material under sulfate attack

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2015年02期
Page:
167-173
Research Field:
Publishing date:

Info

Title:
Numerical simulation of expansion equivalent stress in cement-based material under sulfate attack
Author(s):
Yin Guangji1Zuo Xiaobao1Sun Wei2Tang Yujuan1
1.School of Sciences,NUST,Nanjing 210094,China; 2.School of Materials Science and Engineering,Southeast University,Nanjing 211189,China
Keywords:
sulfate attack cement-based material mechanics analysis model equivalent stress crystallization stress
PACS:
TU313
DOI:
-
Abstract:
For the volumetrical expansion of cement-based materials caused by sulfate attack,the mechanical model of the representative volume element(RVE)reflecting the interaction between cement matrix and ettringite crystal in capillary pores is established based on the microporous mechanics and the crystallization theory.The distribution of the expansive stress in RVE with a certain ettringite concentration is analyzed on a microcosmic scale.By the homogenization method,the change of the expansive equivalent stress on RVE location with the ettringite concentration is studied on a macroscopic scale.Results show that,on the microcosmic scale,the stress in the ettringite sphere of RVE is an isotropic compressive stress,the radial stress in cement matrix's spherical shell is compressive stress,and the circumferential stress in the shell is tensile stress.On the macroscopic scale,the radial equivalent stress of RVE is a compressive stress,the circumferential equivalent stress is a tensile stress,and both of them increase with the ettringite concentration.

References:

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Last Update: 2015-04-30