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Design mix to achieve a required weight

Question

Hi,

Trying to produce hollow concrete blocks; dimensions are: 460mm (18") x 230mm (9") x 230mm (9"). The face shells/webs are an inch thick. 

Problem is, the blocks are required to be heavy: they have to have a minimum weight of 26kg (57.3 lbs) each. Any suggestions on the ideal design mix, cement: aggregate ratios, etc, that will meet this weight requirements?

Many thanks!

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1 answer to this question

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Alas, there is no universal mix design for achieving a targeted unit weight. For your applicable, the density of the units would need to be pretty high (170 lb/ft3 or more) in order to meet this unit weight. You could use a very high density aggregate (magnetite for example as a density of around 5 g/cc). Another (possibly easier) alternative is to fill the cells of the units solid after construction. The combination of the weight of the unit and the weight of the group in the cells of the unit would greatly exceed the targeted weight of 57.3 lb.

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