The flexural strength of both geopolymers showed an increasing trend as the concentration of the alkaline solution increased.
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Mechanical Properties and Microstructural Characterization of Metakaolin Geopolymers Based on Orthogonal Tests.
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The sentences
With the increase in the Na 2 SiO 3 /MOH mass ratio, the flexural strength of both site geopolymers showed a trend of increasing and then decreasing.