Table 3 Best-fitting values of S u , k r , t 0r , A, E and the corresponding statistical parameters.
From: Optimization of Curing Regimes for Precast Prestressed Members with Early-Strength Concrete
Cases | Eqs | \( f_{{{\text{cd}}}}^{\prime}\) (MPa) | T max (°C) | No of data | Regression parameter nd β | Statical parameters on S thy/ S exp | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
S u (MPa) | k r (days-1) | t or (days-1) | A (×107days-1) | E (J/mol) | β | μ | σ | |||||
I | Eq.(4) | 30 | 20 | 14 | 48.8 | 0.68 | 0.37 | 1.00 | 40,175 | – | 1.41 | 1.22 |
30 | 14 | 44.4 | 0.79 | 0.37 | 1.00 | 39,855 | – | 1.13 | 0.36 | |||
40 | 14 | 42.5 | 0.86 | 0.37 | 0.99 | 39,623 | – | 1.28 | 0.66 | |||
50 | 14 | 44.0 | 0.70 | 0.35 | 0.99 | 40,095 | – | 1.20 | 0.71 | |||
60 | 14 | 38.4 | 1.01 | 0.43 | 1.01 | 39,262 | – | 1.12 | 0.35 | |||
40 | 20 | 14 | 56.0 | 0.91 | 0.37 | 1.00 | 39,511 | – | 1.72 | 1.93 | ||
30 | 14 | 52.3 | 1.15 | 0.38 | 1.00 | 38,928 | – | 1.21 | 0.49 | |||
40 | 14 | 55.6 | 0.93 | 0.37 | 1.00 | 39,454 | – | 1.33 | 0.80 | |||
50 | 14 | 54.7 | 1.09 | 0.42 | 1.00 | 39,065 | – | 1.11 | 0.28 | |||
60 | 14 | 48.6 | 1.29 | 0.37 | 1.01 | 38,657 | – | 1.18 | 0.50 | |||
50 | 20 | 14 | 67.3 | 0.95 | 0.37 | 1.01 | 39,415 | – | 1.60 | 1.72 | ||
30 | 14 | 67.3 | 0.89 | 0.37 | 1.00 | 39,538 | – | 1.70 | 1.89 | |||
40 | 14 | 67.9 | 0.94 | 0.38 | 1.01 | 39,438 | – | 1.59 | 1.90 | |||
50 | 14 | 60.2 | 1.28 | 0.38 | 1.00 | 38,662 | – | 1.30 | 1.02 | |||
60 | 14 | 59.6 | 1.45 | 0.37 | 1.00 | 38,352 | – | 1.55 | 1.17 | |||
II | Eq. (4) | 30–50 | 20–60 | 210 | Eq. (5b) | Eq. (3) | 0.38 | 1.00 | Eq. (5a) | – | 1.39 | 1.16 |
III | Eq. (6) | 30–50 | 20–60 | 210 | Eq. (5b) | Eq. (3) | 0.38 | 1.00 | Eq. (5a) | Eq. (6) | 0.99 | 0.20 |