# Thermal loss of prestress during the heat curing of precast concrete elements, Δ`P`_{θ}

_{θ}

## Eurocode 2 part 1-1: Design of concrete structures 10.5.2 (1)

The thermal loss of prestress during the heat curing of precast concrete elements may be estimated as follows:

ΔP = 0,5 _{θ}A _{p}E _{p}α (_{c}T - _{max}T) _{0} | (10.3) |

where:

`A`_{p}- is the cross-sectional area of tendons
`E`_{p}- is the elasticity modulus of tendons, see § 3.3.6 (2) and § 3.3.6 (3)
`α`_{c}- is the linear coefficient of thermal expansion for concrete. Following 3.1.3 (5),
`α`= 10⋅10_{c}^{-6}K^{-1}unless more accurate information is available. -
`T`-_{max}`T`_{0} - is the difference between the maximum and initial temperature in the concrete near the tendons, in [°C].

This application calculates
the thermal loss Δ`P _{θ}`
from your inputs.