would like to color concrete mix can I use outdoor latex paint to mix in with the concrete?
While you probably could, this wouldn't be a good way to try and match a color. It would likely effect the setting performance of the concrete and you'd never match the color of the paint. On top of everything else, it would be much more expensive than the alternatives - all you really need is the pigment and everything else that makes up the paint is essentially wasted.
Cured concrete is a chemical brew. When concrete is setting, it doesn't just dry out. There is an exothermic chemical reaction going on. Go put your hand on it. It'll be warm (or hot, depending on how thick the pour is).
My point is that if you were to mix latex (rubber) into the concrete mix to color it, you would be interfering with the chemistry and would end up with weaker (or very weak) concrete.
The correct solution is a concrete dye or stain that is created for this purpose.
SERIOUS EDIT: A comment prompted me to do a little bit of research, and there's a chance that mixing the right proportion of latex paint into concrete based on Portland cement might be fine, or even improve certain properties of the concrete. Concrete curing absolutely is a chemical process, but it seems that the polymers in latex might actually work in a synergistic way with cement as both cure together.
It seems there has been substantial research in the past into PMC (Polymer Modified Concrete) or LMC (Latext Modified Concrete) to improve properties like tensile strength and chemical permeability. One of the problems was that the cost per gallon of LMC was three times as high as regular concrete. So there has been more recent research into the potential to use waste latex paint to produce LMC (Latex Modified Concrete). There's obviously more in latex pain than just latex and pigment, and it might differ quite a bit from brand to brand, but this is suddenly a pretty interesting possibility, to me.
A quote: "It is thought that a co-matrix is formed in LMC, where the cement paste is surrounded by a polymer film. Figure 1 displays a three step formation of the polymer-cement co-matrix (Ohama, 2005).
I haven't read the whole thing (skimmed it), and who knows if the link will last forever, but here's one resource from academia: http://digitalscholarship.unlv.edu/cgi/viewcontent.cgi?article=2232&context=thesesdissertations
Caveat Emptor. I'd do more research, ask more questions, and try to find specific information on what ratios to use, but this might be just fine to do!? ;-)
I can tell you that I have mixed latex paint with Portland cement(Mortar mix). I put the slurry into a spray hopper and sprayed my concrete block wall. I wanted the wall to match the house in color and finish. It worked perfectly. I did this in 2008, and the wall looks as good today as the first day I sprayed it. The wall has an adobe finish, and the grout lines are not even visible. To this day there is not one crack, chip, or flaking going on. The wall finish is almost bulletproof!
Isn't this the basis for products such as UGL waterproof paint? I know that paint MUST be added to ready mix drywall mud to accomplish water resistance prior to decorative finishing. I know acrylic additive is available for all portland cement based products. I know latex additive is available for ceramic tile mortars. In my estimation, these are over-priced dilutions. I have mixed paint with cement for decades and had very good results. "Bulletproof" (as the one comment said) is not an understatement!!