There is one item in the calculation of concrete lateral pressure on formwork: concrete slump110 mm-150 mm Ks =1.15 What does this ks mean?

In the new code GB 50666-201KLOC-0/Code for Construction of Concrete Structure Engineering, there is no Ks in the formula of the standard value f of the maximum lateral pressure of fresh concrete, and there is no Ks in the Technical Code for Safety of Construction Formwork in JJ162-2008, only β-when the slump is 90 ~/KLOC. When the slump is 130~ 180, β is 1.0.

Ks is the influence coefficient of slump in the past, but the code has been modified again and again, and the topic is' Old Yellow Calendar' is out of date!