In the all geopolymer concrete paper it is mentioned like sodium silicate/sodium hydroxide ratio=2 or 2.5 or 3 what is that value how it will get that ratio value and what basis.is there any mix design code book for geopolymer concrete?
It means the ratio between the mass of sodium silicate and sodium hydroxide.
Though there is no mix design code book for geopolymer concrete, this ratio has been found to give the optimum compressive strength.
Unfortunately we dont have any valid code for designing geopolymer concretes and we use ASTM C parts for mix design of these kind of concretes. In my opinion, most of the ratios have earned from lab experiences based on variety aims.
And i have earned this ratio in lab and i found this optimum ratio for SS/SH,it was 2.5 and i got very desirable compressive strength.
Good luck.
There are multiple studies about the "Effect of Sodium Silicate to Sodium Hydroxide Ratios". However, as I noticed, different papers present different results for the same ratio. My opinion is that the optimum ratio between the Na2SiO3 and NaOH must be particularly calculated for each type of raw material.
Just keep in mind that the sodium silicate is used for its aggregation capacity while the sodium hydroxide is used for its dissolution capacity.
Yes, the ratio 1:2 or 1:2.5 has been established to achieve optimum geopolymerization. However, I have experimented with ratios 1.5-2.5, and I found that this ratio definitely depends upon the choice of source materials used and other internal factors too.
Thank you
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