Abstract
To improve the precision of simulation on drying shrinkage induced cracking, in this paper a cracking model is proposed based on an existing multi-scale analytical system.
First, three models related to water status in micro-pores are proposed; firstly, an effective driving force model via micro-cracks near the concrete surface; secondly, a local tensile strength model in which the strength is increased by the progression of drying; and finally, a water diffusion speed model via cracking.
Furthermore, two models related to shrinkage of aggregate are also discussed; firstly, an apparent aggregate shrinkage model in which aggregate shrinkage is decreased by the influence of micro-cracks around an aggregate; and secondly, an apparent tensile strength model in which tensile strength is increased by shrinkage of aggregate. With the proposed models, the beam specimen which is exposed to drying conditions can be reasonably simulated.
