The results of the compressive strength tests are presented in Fig. . The incorporation of porous pellets led to a reduction of strength by about 9% and 23% for the C-LWA dry and C-LWA saturated, respectively. The Young's modulus and density results are presented in Table . The effect of porous C-LWA on the Young's modulus was more prominent than in the case of compressive strength. This phenomenon is well known for concretes with porous aggregates that have lower stiffness than conventional quartz-and limestone-based aggregates, in particular LWA or recycled concrete aggregates . Based on these results, one can estimate the elastic modulus of the aggregates using a composite model, e.g. the Mori-Tanaka method, similarly as in . This yields an estimated elastic modulus of the C-LWA as equal to 8.5 GPa.