I like your material it's pretty cool but I can't say if it's mud or fresh concrete. If you want just to create a normal concrete material with some humidity in it maybe you can break the fact that your humidity map is the exact reflect of the volume of your surface. You could maybe reduce the size of your grain as well.
A couple of things that I think could help. One is adding some warm cool color variation. Check out this image. Concrete has a lot of different subtle grays in it. Secondly, when concrete absorbs water it becomes darker and loses the shine when the water is no longer on the surface. I think adding this between the wet and…