From Bashter et al. (1996) the hematite–serpentine and ilmenite–
limonite concrete shields under comparison have densities of
2.5 and 2.9 g/cm3 respectively. The choice of relative percentage
of concrete ingredients, unit weight, compressive strength, tensile strength and flexural strength were done by the Egyptian Central
Organization for Housing, Building and Planning Research. The relative
percentage weight of the raw materials entering in the preparation
of unit weight of concrete samples under investigation
were shown in Table 1.