Evaluation of bulk density and quality control of special concrete for radiation shield walls in a hospital project in Sinaloa

Abstract

Special concrete was employed as radiation shielding in a hospital construction project located in Sinaloa, Mexico. Quality control performed during the technical evaluation was essential in identifying a deficiency in the volumetric mass of the concrete. The initial value was 2,360 kg/m³, which falls below the minimum requirement of 2,400 kg/m³ established by the Nuclear Safety and Safeguards Commission (CNSNS). In response, test mixtures were prepared on site using the maximum density concept, and a technical report was issued to request dosage adjustments from the supplier. Subsequently, field tests were then conducted, including temperature and slump measurements and concrete cylinder samples to verify compressive strength in accordance with NMX-C-083-ONNCCE-2014 standard. Moreover, the placing, vibration, and curing processes of the adequate concrete mix were closely supervised. The results of this study evidenced substantial improvements in the cohesion, density, and overall quality of the concrete. These findings underscore the critical importance of systematic monitoring and timely technical interventions to ensure the suitability of concrete for high demand applications, such as radiation shielding in hospital infrastructure.