laying drivewith block pavers squares filled with grit/cemet

[slap2011]

laying drive with block pavers in 1200mm squares filled with grit/cement miw but the grit /cement mix is breaking up and it more like copacted grit was mixed as 4/1 mix this is obveusly not strong enough any advise out thier

[welsh brickie]

Its my understanding that the cement your laying is a 4:1 mix and it keeps cracking?
The mix you require is 6 sharp sand 1 cement and 1 gravel either 6mm or 10mm will do.Its the gravel that gives the concrete its strength, the thickness also needs to be a minimum of 100mm .