Porosity is related to the CS. The compressive rupture strength,as function of SMC,
decreased approximately 50% when 5% of residue was added recording 20 N/mm2.
Then, the trend varies linear, decreasing until 10 N/mm2(see Fig. 6). Results show a decreasing up to 65% when 17% of SMC is added, while in Ref. [31]
it decreases approx. 35% when 15% of SMC is added.