An approach to determine diffusivity in hardening concrete based on measured humidity profiles Academic Article uri icon

abstract

  • A novel method to numerically determine the diffusion coefficient of hardening concrete from measured pore relative humidity profiles is presented, which is based upon an inverse nonlinear diffusion analysis. A system for nondestructively measuring the development of pore relative humidity required for this analysis in a uniaxially drying concrete specimen is described. The diffusion equation is solved by the method of lines, with collocation in the space variable to reduce the problem to a system of ordinary differential equations. Based on the solution of the diffusion equation, an auxiliary formulation is derived by searching the calibration factor in diffusivity that minimizes the residual between the calculated relative humidity and the measured data at each measured point in each small time interval. A working algorithm and numerical results are presented in this paper. 1995.

published proceedings

  • Advanced Cement Based Materials

author list (cited authors)

  • Xin, D., Zollinger, D. G., & Allen, G. D.

citation count

  • 15

complete list of authors

  • Xin, D||Zollinger, DG||Allen, GD

publication date

  • January 1995