If I understand you correctly, the saw cuts that the contractor
put in on purpose have cracked all the way through the slab.

This is exactly what was supposed to happen. A tooled joint or
saw cut is used to tell the concrete where to crack and to please
do so in a nice straight line rather than a random, jagged line.
If you are wanting to seal the joints use a polyurethane pavement
sealer:
Vulkem (Tremco) and NP 1 (Sonneborn) come to mind. They both make
a self leveling sealer if your circumstances allow.

______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




"Stuart Benoff" wrote in message
...
I had a new 24' sidewalk poured last May that was "cut" into 8
3ft each blocks. I just noticed that in 2 of the cuts there are
cracks the entire width of the block.

Did the contractor mess up when he poured this by putting too
much stress on the blocks by not leveling it properly?

Also, what should I do about this? I'm concerned that water
will get into the cracks and cause additional damage.

Thank you!