Drying of concrete

Exercise 10

Evaporation of water from K30 concreteEv

apor

ated

wat

er k

g/m

3

Drying time estimates:

90 mm thick ground slab: • made of K30 concrete, • has not been wetted but• has been wet cured for 2

weeks• Drying environment: 18 °C/

RH50 %

When is RH of 85 % reached?

Drying time =basic dying time * w/c ratio * thickness * moisture of the foundation * wetting time * drying conditions

Drying time =basic dying time 17 weeks * w/c ratio factor 1,0 * thickness factor 1,4 * moisture of the foundation factor 1,0 * wetting time 1,0 * drying conditions 0,9 ≈ 21 weeks