Fig. 4: Physical and mechanical properties of the SR-RA blocks.

a Compressive strength, b density, c water sorptivity, d comparison of density with the data of fired clay bricks in the literature, e water absorption-porosity relationship, and f strength-density relationship (The fitness of three datasets. 1: y = −1.09x + 43.71, R² = 0.81; 2: y = −0.53x + 34.74, R² = 0.67; 3: y = −2.03x + 108.74, R² = 0.91).