To this end, waste onion skins and peanut shells were ground to a size of 1 millimeter and fly ash, pumice, perlite, barite, cement and gypsum were added to pro-duce samples with a size of 4 × 4 × 16 centimeters. These samples were kept in an oven for 24 h at 100◦C. Apparent specific gravities, water absorption rates, flexure and compressive strengths of the samples were determined. Moreover, thermal conductivity coefficients, ultrasonic sound penetration coefficients and radioactive permeability values were also investigated.