**3. Results**

### *3.1. Rheological Properties of Cement Paste Mixes*

The results of slump flow values obtained for the respective cement paste mixes have been presented in Figure 2. It may be seen that the slump flow of the investigated mixes generally tends to decrease with the increase in cement substitution level. However, the 0.30 5% mix reveals the highest slump flow of all investigated mixes, i.e., 182.5 mm.

**Figure 2.** Effects of cement substitution with spent FCC catalyst on the slump flow of cement paste mixes.
