Abstract:
Dense concrete is extensively used in radiation shielding of nuclear structures and medical facilities. Crystallized slag, GGBFS and magnetite are extensively used for making dense concrete. Slag is an important industrial waste which is an environmental hazard. Improper disposal of this waste creates many health problems for the community. Using it for making dense concrete creates an eco-friendly setup to make efficient use of a hazardous industrial waste. Similarly Magnetite is abundantly found in nature. Magnetite is second most abundantly found mineral in Pakistan [ ]. The dense concrete thus prepared will be an economical solution for safe usage of nuclear radiations for medical uses and power generation. When crystallized slag was used from 40% to 100% as coarse aggregate, it increased density of concrete from 0.87% to 3.71%. The compressive strength of concrete increases about 3.7% for 40% replacement of crystallized slag with coarse aggregate. However, increasing it more than 40% decreased compressive strength up to 8.25%. Concrete with Crystallized slag from 40% to 100% increased shielding capacity of concrete from 1.3% to 10.2%. When GGBFS was used from 40% to 100% as fine aggregate, it increased density of concrete from 1.34% to 3.46%. The compressive strength of concrete increases about 5.76% for 40% replacement of GGBFS with fine aggregate. However, increasing it more than 40% decreased compressive strength up to 7.25%. Concrete with GGBFS from 40% to 100% increased shielding capacity of concrete from 1.2% to 5.7%.When magnetite was used from 40% to 100% as coarse aggregate; it increased density of concrete from 12.2% to 25.93%. Increasing the percentage of magnetite from 40% to 100% increases the compressive strength of concrete from 3.39 % to 4.76 %. Concrete with Magnetite from 40% to 100% increased shielding capacity of concrete from 32% to 45.12
