You might have made a mistake on your thickness as the ballast alone will be thicker than that!
Based on a ratio of 1:2:4 (cement:sand:ballast) - Approx values!!
40mm THK - 240KG of cement, 450 KG of sharp sand, 900KG of ballast and 132 litres of water
400mm THK - 2400KG of cement, 4500 KG of sand, 9000KG of ballast & 1320 litres of water
Just in case you did want 4mm THK it would be 24KG:45KG:90KG with 13.2 litres of water
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Answered 3 years ago
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"4mm" thick - do you mean 40mm perhaps, even that is on the thin side. Either way there are some good quantity calculators on the net e.g. try pavingexpert dot com.
Answered 4 years ago
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