farzad lohrasbi; mohamad mehdi jabbari
Volume 3, Issue 9 , December 2021, , Pages 32-50
Abstract
One of the important differences between the properties of ordinary concrete and heavy concrete is the use of metal or mineral aggregates instead of sand in concrete. Using ilmenite powder as a substitute for currently used heavy metals such as lead in concrete can reduce costs as well as sustainability ...
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One of the important differences between the properties of ordinary concrete and heavy concrete is the use of metal or mineral aggregates instead of sand in concrete. Using ilmenite powder as a substitute for currently used heavy metals such as lead in concrete can reduce costs as well as sustainability and environmental protection. Use of heavy concrete to prevent harmful radiation for construction of hospital, military, nuclear centers and also to increase durability and resistance to wear and penetration of chloride ions for the construction of offshore concrete structures such as ports, offshore oil rigs, breakwater walls and Lighthouse or used in dam industry. In this research, an attempt was made to evaluate the durability of heavy concrete against intrusion by using a laboratory program using heavy grain of ilmenite and in order to support the production of domestic industries and mines using ilmenite powder of titanium mine in Kahnooj city of Kerman province. Chloride attack ions should be treated by RCMT method. In this research, samples made according to ACI standard by absolute volumetric method and laboratory optimization based on the type and properties of materials used have been prepared. The heavy concrete mixing plan has been adapted by replacing ilmenite powder with a maximum size of 1 mm in volume ratios of 10%, 20%, 30%, 40%, replacing sand in concrete and cement grade of 450 kg per cubic meter. The results of this study show that the use of ilmenite powder in heavy concrete increases the density of concrete and reduces the penetration rate of attack ions in concrete, so that by adding 20% and 30% ilmenite powder in the concrete structure, respectively, chloride ion penetration coefficient of 27% And is reduced by 22%.
