PORE STRUCTURE SIMULATION OF SELF-COMPACTING CONCRETE AND APPLICATION

摘要

The pore structure simulation and the prediction of elastic moduli of self-compacting concrete are discussed in this paper.According to the geometrical probability relationship between a spherical pore and the corresponding circular one,an exact solution was derived to the cumulative distribution function for circular pores in terms of the number of the circular pores.The effect of the characteristic parameters of pores on the cumulative distribution,function was then numerically studied.Based on the cumulative distribution function derived,an algorithm was presented for generating and distributing circular pores within a square simulation domain with periodic boundary conditions.As an application,a unit cell model was developed to predict the elastic moduli of self-compacting concrete with pores.Since the pore area fraction is usually very small,a special mesh generating technique was adopted to divide the unit cell as accurately as possible.Finally,a parametric study was conducted to quantitatively assess the effect of the pore area fraction on the Young's modulus and Poisson's ratio of self-compacting concrete.