Any tips on laying a patio ?

I am laying slabs onto a concrete base. The flags just wont stick using a 1-4 mixture of cement to soft sand. Anyone had any similar experiences or solutions? At the moment I have four different flags drying out with different mixtures to see what WILL work, but not confident at the moment.
Use sharp sand. Soft sand has round particles, whereas sharp (or builders sand) has irregular size and shape which cling to each other.
I tend to wet the flags if they are bit dusty. Possibly try an additive in the sand/cement mix.
 
I am laying slabs onto a concrete base. The flags just wont stick using a 1-4 mixture of cement to soft sand. Anyone had any similar experiences or solutions? At the moment I have four different flags drying out with different mixtures to see what WILL work, but not confident at the moment.
A P McCormack's website www.pavingexpert.com is a treasure trove of info. Or ask @Magicpole to do it. The chancer sounds like he owes someone a patio.
 

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