I poured a new concrete bottom stair, replacing several layers of
asphalt that was used to reach the original concrete block at the
bottom of the wooden stairs. It looks pretty good.
I have a few questions on how to finish off the original block and the
new concrete bottom stair:
1. There were "curing" instructions on the concrete bag. It said to
either add a curing additive to the mix, or keep the concrete wet for 5
days. Since there was no rush to use the stair, I kept it wet. My
question is, why does keeping the concrete wet cure it, and why doesn't
just letting the concrete dry normally work?
2. I would like the new stair to match-up with the old concrete stair
just above it. I bought a bag of top cement to spread a thin layer
over both stairs to make them look alike. I was hoping to make a 1/4"
layer, but there are some good sized pebbles in the mix that would make
it hard to smooth out the cover layer. My question is, can I
screen-out these pebbles and use the remainder to spread over the two
stairs? Will this sand and cement layer be strong enough to not crack
or break off?
TIA for any tips, suggestions, comment.