*3.5.2 SEM analysis*

SEM analysis was carried out for the samples having mixture of fine aggregates (DMS and M-Sand) and for sample with DMS only. The obtained SEM images are shown in **Figures 18** and **19**.

From **Figure 18**, it shall be observed that geopolymer matrix is well formed and the ITZ gap between the aggregates and matrix is less leading to greater compressive strength in case of D20 which confirms the inference obtained earlier that strength decreases after D20. Further, micro cracks are observed in case of D100. (**Figure 19**).

**Figure 18.** *SEM analysis of G40A.*

**Figure 19.** *SEM analysis of GOA.*
