3.1.4. Water Retention

According to the registration of the five values (mv, ma, ms, mw, and m) of the mass of the set, the water/fresh mortar factor (AF) and the water retention (Ra) were then calculated, considering each mixture in the different substitutions (0%, 10%, 30% and 60%) in the three types of Portland cement (CP II, CP III and CP V), as shown in Tables 10–12.

**Table 10.** Water retention in mortar with Portland cement type CP II.


**Table 11.** Water retention in mortar with Portland cement type CP III.



**Table 12.** Water retention in mortar with Portland cement type CP V.

Analyzing the water retention in Portland cement type CP II, it appears that the mortar with the lowest retention was the one with 10% of sand replacement by OSPW with 95.81%, while the mortar with the highest retention was the one with 60% of replacement with 99.07%. The same characteristics are found in cement type CP III; the mortar produced with 10% replacement has the lowest retention with 97.71% and the mortar with 60% replacement has the highest retention with 99.27%.

Considering the Portland cement type CP V, there is a difference from the others. The mortar with the lowest retention is the one with 30% replacement with 98.45% instead of 10%, as in the CP II and CP III cements. The one with the highest retention is the 60% replacement with 98.94%, as in the other cements.

Examining the control mortar (0% OSPW), it is noted that the lowest value is found in CP II cement with 96.29%, while the highest is found in CP III with 98.73% retention. At 10% replacement, the lowest value is also found in CP II cement with 95.81%, while the highest is for CP V with 98.90% retention.

As for the analysis of the mortars with 30% replacement, it is noted that the lowest value is found in the CP III cement with 98.42%, while the highest is found in the CP II with 99.03% of retention. At 60% replacement, the lowest value is found in CP V cement with 98.94%, while the highest is found in CP III with 99.27% retention.
