Page:4SIGHT manual- a computer program for modelling degradation of underground low level waste concrete vaults (IA 4sightmanualcomp5612snyd).pdf/117

39. INITIALIZE PARAMETERS if ($$D_\infty$$.is_default = TRUE) $$D_\infty$$.value = $$1.0\cdot10^{-04}$$ * pow(10.0, 6.0 * wc.value -9.84); if ($$k_\infty$$.is_default = TRUE) /* kinfty.value = 1.0E-18*(0.8904+.002525*exp(15.07*wc.value)); */ $$k_\infty$$.value = pow(10.0, (5.0* wc.value - 21.0)); } $$\vartheta_0$$ = $$D_\infty$$.value/anion [Cl]. $$D_f$$; if $$\vartheta_0$$ < DLIMIT ) $$\vartheta_0$$ = DLIMIT +0.0001; if $$\vartheta_0$$ < DLIMIT + 0.07 * SQR(.18)) $$\phi$$ = sqrt(( $$\vartheta_0$$ - DLIMIT)/.07); else $$\phi$$ = .17326 + sqrt(.03002 - (.05832 + DLIMIT - $$\vartheta_0$$)/1.87); $$\alpha$$= (3.2 * wc.value)/1.36 - $$\phi$$ *(1 +3.2* wc.value)/1.36; ƒ = 1.0/(1+ 3.2 * wc.value); Vsample = 1000.0/$$\phi$$; molesCH = $$\alpha$$ + (0.61) * f * Vsample/$$\rho_{CH}$$; F = 1.0/$$\vartheta_0$$; $$D_0$$=$$D_\infty$$.value; $$k_0$$=$$k_\infty$$.value; litre [0] = 0.001* Vsample * $$\phi$$; for (k = 1; k< NUM_SURFACES; k++) { sol_array[Ca] [OH].s[k] = molesCH; litre [k] = 0.001* Vsample * $$\phi$$; } for (k = 0; k< NUM_CELLS; k++) { $$\xi$$[k] = $$\vartheta_0$$ $$\phi^n$$[k] = 6; }

This code is used in section 41. 43. The routine aci-211 estimates the strength, in psi, of the concrete in the individual com- putational elements. The estimate is based upon Table 5.3.4(a) of ACI 211.1-81 for air-entrained concrete. The strength can be adjusted to account for changes in porosity using: $$\textit{psi}'\left [ i \right ] = \textit{psi}_0 \frac{ \ln{ \left ( \phi^n \left [ i \right ] \right ) } } {\ln { \left ( \textit{phi}_0 \right ) } }, $$

(Function declarations 23) += void aci-211 (void);

44. void aci211

{  int i;   real $$\psi$$; $$\psi$$ = pow(exp(wc.value - 3.575), -2.6817); for (i = 0; i < NUM_SURFACES; i++) strength [i] = $$\psi$$; } 45. The function yyparse sets the concentration in the concrete by putting the user-specified value into the c[1] cell. The internal concentration is established by copying this value into the remaining cells. However, this procedure is not performed for OH and H.