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Concrete crack control

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Can anyone suggest a good reference for concrete crack control in exposed
concrete walls. Are there any rules of thumb for crack control as a function
of strength, w/c ratio, type of aggregate, type of forms, spacing and size
of control joints, etc.

We just finished a 20 foot section of 11' tall, 10" wall, double curtain
reinf,  that will not be exposed, but was used as a mock up for a future

We had a .43 w/c ratio, 3/4 aggregate, 5500 psi mix with poly fibers, using
mahogany forms on one side and ac ply on the backfill side. The finish looks
like it was steel troweled, glassy smooth. However, there are two 8' long
vertical hairline cracks that occur between snap ties about 4-6' apart. The
crack does not extend to the back side of the wall.

The 4.1 Point Richmond quake was a few days after the pour, I can't believe
that was what caused it. We already completed an orthogonal wall that was
about 40' long that was board formed, no control joints, using pea gravel
that has no cracks in it. 17 day compression test was 4300 psi.


Jeff Smith