Effect of relative humidity on drying-induced damage in concrete
A comparative study of digital image correlation and lattice modelling
Peng Gao (South China University of Technology)
Yang Chen (South China University of Technology, Guangdong Provincial Academy of Building Research Group Co., Ltd.)
Haoliang Huang (South China University of Technology, Guangdong Low Carbon Technologies Engineering Center for Building Materials)
Zhiwei Qian (FEMRIS)
Erik Schlangen (TU Delft - Materials and Environment)
Jiangxiong Wei (Guangdong Low Carbon Technologies Engineering Center for Building Materials, South China University of Technology)
Qijun Yu (Guangdong Low Carbon Technologies Engineering Center for Building Materials, South China University of Technology)
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Abstract
To assess the effect of relative humidity (RH) on drying-induced damage in concrete, the non-uniform strains and microcracks in concrete under different RH conditions were obtained using the digital image correlation (DIC) technique and lattice fracture model. The simulated non-uniform displacements were consistent with those captured using DIC. A new damage index was proposed by considering all the subsets with equivalent strain larger than the threshold tensile strength. The calculated damage index showed good correlation with the microcracks' total area and indicated that RH equal or lower than 55% could cause relatively high cracking risk. This work provides an attractive method for quantifying drying-induced damage in concrete using the DIC technique.
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