Table 1 Coefficients from ACI 209 model code.
From: Effect of a Time Dependent Concrete Modulus of Elasticity on Prestress Losses in Bridge Girders
Cement type | Curing | Duration | ||
|---|---|---|---|---|
I | III | ts (days) | ||
Strength | ||||
a | 4.0 | 2.3 | Moist | |
1.0 | 0.7 | Steam | ||
β | 0.85 | 0.92 | Moist | |
0.95 | 0.98 | Steam | ||