Page:4SIGHT manual- a computer program for modelling degradation of underground low level waste concrete vaults (IA 4sightmanualcomp5612snyd).pdf/139

63. Chloride penetration.

The ratio of the mass of chloride ions to the mass of concrete equal to 0.0004 is the depth of chloride penetration. The ration equals $10^{-}3\left[{\textit {Cl}}^{-}\right]A_{Cl}/\phi /((1-\phi )2.5)$. $A_{\textit {Cl}}({\textit {gm}}/{\textit {mole}})$ is the gram atomic mass of chlorine, $\phi$is porosity, and 2.5 is the density of concrete.

⟨Global variables 4⟩ $+\equiv$
real CLratio [NUM.SURFACES];
 

64.

⟨Assess chloride penetration 64⟩ $\equiv$
for (k = FIRST_CELL; k < NUM.SURFACES; k++);
  CLratio[k]=35.5 * anion[Cl].moles[k]/(2.b * (1.0-$\phi '^{n}$[k] * Vsample);
  k= NUM.SURFACES - 1;
  while (k $\geq$ 0 \land Cl.ratio[k] < 0.0004) k--
  if k < 0) chloride. depth = 0.0;    /* k at lower limit */
  else {
    if (k$\equiv$ FIRST_CELL) {   /* account for distance equals $\Delta X$ */ 
      chloride.depth = $\Delta X$[FIRST_CELL] * (CLratio[k] — 0.0004)/(CLratio[k]—CLratio[k+1]);
      chloride.depth += (real) FIRST_CELL; 
    }
   else chloride.depth = (real) k + ( Cl.ratio[k] —0.0004)/(Cl_ratio[k] - Cl.ratio[k+1]);
}

This code is used in section 10.