Table 6 Computed maximum stresses and stress-strength ratio.
Mix | Water-cement ratio | Coefficient of thermal expansion (m/m/°C) | Modulus of elasticity (MPa) | Modulus of rupture (kPa) | Computed stress (kPa) | Stress-to-strength ratio | |||
|---|---|---|---|---|---|---|---|---|---|
Corner | Mid-edge | Corner | Mid-edge | ||||||
Temperature differential of +11.1 °C (+20 °F) between top and bottom | |||||||||
 SM | 0.40 | 7.965 × 10−6 | 30,682 | 4999 | 1502 | 3110 | 0.30 | 0.62 | |
 ICC 1 | 0.32 | 7.630 × 10−6 | 26,890 | 5654 | 1340 | 2740 | 0.24 | 0.48 | |
 ICC 2 | 0.40 | 7.630 × 10−6 | 26,200 | 4861 | 1314 | 2687 | 0.27 | 0.55 | |
Temperature differential of −5.6 °C (−10 °F) between top and bottom | |||||||||
 SM | 0.40 | 7.965 × 10−6 | 30,682 | 4999 | 1499 | 1067 | 0.30 | 0.21 | |
 ICC 1 | 0.32 | 7.630 × 10−6 | 26,890 | 5654 | 1415 | 952 | 0.25 | 0.17 | |
 ICC 2 | 0.40 | 7.630 × 10−6 | 26,200 | 4861 | 1407 | 936 | 0.29 | 0.19 | |
Temperature differential of 0 °C (0 °F) between top and bottom | |||||||||
 SM | 0.40 | 7.965 × 10−6 | 30,682 | 4999 | 1195 | 1622 | 0.24 | 0.32 | |
 ICC 1 | 0.32 | 7.630 × 10−6 | 26,890 | 5654 | 1137 | 1566 | 0.20 | 0.28 | |
 ICC 2 | 0.40 | 7.630 × 10−6 | 26,200 | 4861 | 1126 | 1556 | 0.23 | 0.32 | |