Rational powers and simplification



Is something changes in Maxima handling of powers? In older versions I got 
this:

(%i1) 4*sqrt(2);
(%o1) 4*sqrt(2)
(%i2) 6*sqrt(2);
(%o2) 6*sqrt(2)


while in  Maxima 5.19.1 I get:

(%i1) 4*sqrt(2);
(%o1) 2^(5/2)
(%i2) 6*sqrt(2);
(%o2) 3*2^(3/2)

I don't want sqrt(2) to be merged with integer powers of 2. I would like to 
see 4*sqrt(2) and 6*sqrt(2) instead of 2^(5/2) and 3*2^(3/2). Is there a 
command to do this?
Thank you.
Stefano