My comments are as follows;
1. Introduction part: How important to mention nano-application in this work? Because there was no comparative study for this factor. It was not relevant with this work.
2. Figure 3: The caption must be revised because there was no dicalcium silicate formed under these conditions.
3. Discussion (Characterization of dicalcium silicate part) is too short: This part is in need of more detail discussion. Ex. The left over CaO or why it did not react with SiO2.