You should try to fit the best graduation that your aggregates allow. Some mix design methods, as Faury, included e.g. the fine content, as cement, in the calculation. At the moment you fill all pores with materilas instead of air pores, you are achieving maximum compactation and compressive strength.
Hi Abbas, Foam concrete is defined as cement paste which air-voids are trapped in mortar by foaming agent that is mechanically blended, either by mixing or injecting, and in most cases has an air content of more than 25%.
The two key performances of foam concrete can be listed as being lightweight and having high flow ability
The first step is to select a mix design with an appropriate density.Considering the application of foam concrete (flow requirement) a specific mix design can be optimised. The key factor is density of mix that has direct influence on the strength of foam concrete.
Foam concrete with densities between 800 and 1200 kg/m 3 are produced for different application as listed follows (Source: Neville, 1985 and Aldridge, 2005):
Density 300 - 600 kg/m3 (expected strength f'c 28d
i think the key factor is to use good cement with high compression strength and fine sand because it was proved that fine sand can give high strength more than coarser one and besides you can use SP when decreasing w/c ratio. more over using supplementary cementing materials could be used to enhance properties of foamed concrete.
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