wrote:

Is it possible to mix black latex outdoor paint with saccrete to
give the concrete color?

See below.

My take on this is that yes, you can replace water with a similar amount
of latex paint when mixing concrete and end up with similar or even
stronger concrete than if only water was used, even if up to 66% of the
water is replaced with paint.

The tests performed by the State of Florida (see below) was aimed at
diverting the maximal amount of discarded household latex paint possible
into slabs of concrete poured as pads around various municipal buildings
are work yards. If the goal is to simply color the concrete, then it is
probable that a much lower amount of paint would be needed to achieve
the desired result, and the effect on workability (slump) and long-term
strength would be minimal or even improved.

Web searches for "Paintcrete" should yield a lot of useful info and
data.

==============
Making Concrete Pavers and Flagstones DIY Projects

How to Add Color to your Concrete Project

1. Paint – Yes, you can add latex paint to your concrete mix and the
color will go throughout the whole casting. It must be latex paint but
it can be any color or mixture of colors. This is an option that calls
for a lot of testing. If you use the regular gray cement your color will
be affected. Try to use white cement. If you’re using sand mix, plan
extra time for testing. It will take much longer than you think to
determine the right formula for the color you have in mind.

2. Dry color additives – These are added either during your mixing or
sprinkled on top of your pour. You can sprinkle one color and then
another color to achieve a natural stone look. This finish can wear in
time also since it is a surface pigment.

3. Liquid color additives – These are mixed into your concrete before
you pour and color the entire cast, not just the top. Testing is
required. This is the stuff you see the guy pouring into the cement
mixer just before he pours a driveway.

http://www.pobox355.com/how-to-add-c...crete-project/
===============

Adding Latex Paint to Concrete

By Concrete Construction Staff

Q.: We're bidding a job that requires a white concrete floor. Another
bidder has proposed mixing white latex paint in with the concrete. Can
this work?

A.: We checked with two experts in applications of latexes and other
polymers in concrete, and neither has heard of this practice nor
believes it would work. The latex used in paint is not compatible with
portland cement, so adding latex paint to the concrete mix could make a
gooey mess. If any of our readers have tried this, please tell us your
experiences.

We recommend you stick to the proven methods of producing white concrete
surfaces: use white portland cement, color concrete with a titanium
dioxide pigment, or apply a white surface coating.

http://www.concreteconstruction.net/...-concrete.aspx

=================

Paintcrete
Concrete made with left over latex paint admixture
Final Report
Feb 20, 1996

Florida Dept. of Environmental Protection
Agreement #HW275
Unique or Innovative Household Hazardous Waste Grant
In Partnership with Okaloosa County, FL

- a way to divert the household hazardous waste stream - by
incorporating these materials into concrete)

The question is can this be done while maintaining the structural
integrity of the concrete, ie, design strength?

- descriptions of several test samples and slabs poured using old
latex paint during 1994.

- the most controlled test consisted of 250 gallons of paint mixed
into 17 cubic yards in the form of a slab 25 ft by 37 ft.

- All tests resulted in a hard, functional slab, but failed
compressive strength tests.

- However, in every instance, the masons had added so much extra water
that it practically liquified the mix, which probably resulted in
sub-standard strength.

In late 1995 they performed the most controlled batch design where the
amount of water was very carefully rationed. They made a mix consisting
of 1.5 cubic yards of concrete (containing 5 gallons of water) to which
they added 10 gallons of paint and then 1 gallon of water. Normally,
1.5 cubic yards of concrete would contain 15 gallons of water to get
3000 PSI strength. Instead, their modified concrete contained 6 gallons
of water and 10 gallons of paint. The concrete had a slump of 1.25
inches and compression strength (at 7 days) of 3909 PSI (130% of design
strength).

They added 1 gallon of water to get a slump of 3.25 inches and that
sample had strength of 3472 psi at 7 days. Finally they added 1 more
gallon of water to get a slump of 5.75 inches and it had a strength of
2996 psi at 7 days.

Full report, including test results and pictures:

http://www.dep.state.fl.us/waste/qui...eport_1996.pdf
=================