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How long should I let concrete cure or set up before laying a few courses of small concrete bricks on top of it? This is a tiny pour to fill a void in a window opening? Should I have sunk them into the concrete or is it okay to lay mortar bed to start first course? I'm obviously not a mason but I'm doing a bathroom remodel that's requiring some light masonry to fit a glass block panel.
 

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Agree with all the above, Use some high early strength(quick setting) portland cement concrete bag of premix. Really impatient, use hot water, 2x add a tiny bit of chloride powder or liquid (masonry quick set additive).
Next time plan ahead 2 days.....
Durabond 90-45 etc... with some pea rock aggerate????

I've laid many a school footing on 4 hour old concrete spread footings(leaving boot prints) with no probelms in the summer time...
 
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