**5.6 Weight loss**

The results of the mass loss of the various mortars are presented in **Figure 13**. From the **Figure 13**, it is clear that the weight loss of mortars is influenced by the incorporation of marble waste sand. The values obtained are generally high compared to the control mortar. The optimum value is found in the 15% marble waste sand mortar. This is due to the departure of the water initially retained by the grains of the marble sand.

**Figure 13.** *Weight loss of different mortars.*
