More cement makes a stronger bond (to a point - too much cement takes more water, which means more cracking when it dries), and you just don't need that strong a bond for paving - a sand only mix would work fine.
Cheers.
Here's the test patch fairly dry.
I think it's a success and Mrs H has greenlit the project. Plus my folks have a pressure washer, so at some point I'm going to do it.
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@hugo7 started
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More cement makes a stronger bond (to a point - too much cement takes more water, which means more cracking when it dries), and you just don't need that strong a bond for paving - a sand only mix would work fine.