FAQ:General:TypicalInitialMoistureContent

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(12): Typical Initial Moisture Content

I want to find out how long it takes a wall with construction moisture to dry out. Which initial moisture content should I use?

That depends on a number of individual circumstances such as the amount of production moisture (e.g. in cellular concrete or lime silica bricks), the amount of mixing water (in concrete or mortar), the amount of rain hitting the wall while it was unrendered, the season when construction took place (warm/cold) etc., so no general answer is possible here. The table gives examples for typical initial moisture contents:

MaterialWater content [kg/m³]
Fresh concrete:
 free water175
 
Concrete, 28 days old (at 70% hydratation):
 bound water85
 dried water25 ... 45
 free water65 ... 45
  (sum = 175)
Concrete, 3 to 6 months old (at 90% hydratation):
 bound water105
 dried water35 ... 50
 free water35 ... 20
  (sum = 175)
DIN 4108 "thermal protection"
 practical moisture content of concrete50
 
Cellular concrete180 ... 220
Clay brick masonry100 ... 150
Calcium silica brick masonry100 ... 120