Thank you, Christian !
Waiting for your answer
, I noticed that concrete humidity was determinant : with 2,5 % initial moisture, retarder is a bad option, with 8 % (typical construction level given by your database) retarder or nothing are both bad options, a variable Sd value (intello) is needed.
I am going to check if there is a risk of running water as you suggest. I did not do it yet because I thought that the concrete porosity was big enough not to be worried by that.
In the WUFI help, there's only the DIN4108 recommendation
, is the EN13788 only for concrete ? What should I think about a result between 200 and 500 g/m² ?
Finally, I have a better comportment with Sd variable retarder but it began with a big variation and ends with low variation (196 g/m²), what do you think ?
Subsidiary question : my method for measuring the increase in humidity is correct ?!