Abstract: The influence of oxide composition on the dominant factors of strength in geopolymer was studied by combining gray relational analysis and dichotomy. It was found that the geopolymer could be divided into two regions according to the dominance factor of strength. In regionⅠ where the CaO content of geopolymer was less than 25%, the strength was dominated by the ratio of activity oxides (n(SiO2)/n(Al2O3)). The other was the regionⅡ. CaO content of geopolymer in this area was more than 25%, and the strength was dominated by CaO content. By performing the strength fitting in these two regions respectively, the results showed that the region Ⅰ was in accordance with the binary polynomial function and the region Ⅱ was conformed to the binary Fourier function.The projection of fitting surface showed that when the modulus of the water glass was selected form 0.8 to 1.6, low modulus water glass had better stimulation effect in regionⅠ.When n(CaO)/n(SiO2+Al2O3) was less than 0.3, the strength of geopolymer increased with the increase of n(SiO2)/n(Al2O3) . But if n(CaO)/n(SiO2+Al2O3) was more than 0.3, the effect of n(CaO)/n (SiO2+Al2O3) on strength began to show up, and with the increase of n(SiO2)/n(Al2O3), the strength increased first and then decreased. However, high modulus water glass had better stimulation effect in regionⅡ. The highest strength region appeared in the region where n(CaO)/n(SiO2+Al2O3) was large, when activated with low modulus water glass.With the increasing modulus of activator, the n(CaO)/n(SiO2+Al2O3) of highest strength region decreased.
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2017, Vol. 31 
