Researchers at the Indian Institute of Technology Guwahati have engineered a novel radiation-resistant cement mortar aimed at enhancing the safety of nuclear facilities by fortifying structural materials and amplifying their capacity to impede harmful radiation. This microparticle-enhanced cement mortar exhibits superior radiation shielding capabilities while simultaneously increasing the durability and structural integrity of concrete utilized in nuclear installations. The primary goal of this innovation is to aid nuclear facilities in maintaining robust protective barriers against radiation leaks.
The research emphasizes the modification of traditional cement mortar to serve dual purposes as a structural component and an effective radiation-shielding barrier. By augmenting the mortar’s density and endurance, researchers have successfully diminished radiation penetration through concrete structures. They assert that concrete formulated with the enhanced mortar can significantly mitigate the risk of radiation leakage, thereby augmenting safety in critical settings such as nuclear reactors and radiation-handling facilities. This material has the potential to facilitate the construction of sturdier containment walls and structures essential for areas where radiation exposure must be stringently managed.
Historical events like the Chernobyl disaster in 1986 and the Fukushima nuclear accident in 2011 underscore the imperative of radiation safety in nuclear energy systems. The integrity of nuclear power plants largely relies on the robustness and resilience of materials employed in containment structures, which function as barriers to prevent radiation leaks during catastrophic incidents, including earthquakes, explosions, or sudden thermal variations.
To tackle these challenges, the research team has enhanced cement mortar by integrating four kinds of microparticles: boron oxide, lead oxide, bismuth oxide, and tungsten oxide. These were introduced in minute quantities to evaluate their impacts on the mortar’s compressive strength over 28 days and their efficacy in obstructing mixed radiation fields comprising gamma rays and neutrons. Experimental outcomes indicated that each microparticle affected the mortar’s characteristics differently; lead oxide increased density and compressive strength, while tungsten oxide enhanced resistance to cracking and overall durability. Boron oxide markedly improved radiation shielding performance, with tungsten oxide also offering comprehensive protection against various radiation types.
Hrishikesh Sharma, an Associate Professor in the Department of Civil Engineering at IIT Guwahati, articulated the vital role of containment materials in the safety of nuclear infrastructure under extreme mechanical stress and radiation exposure. He highlighted that the study illustrates how meticulously engineered microparticle-modified cement mortar can substantially improve both structural strength and radiation shielding capacity.
The results of this research lay the groundwork for the advancement of next-generation cement-based materials tailored for nuclear power plants, small modular reactors, and medical radiation facilities. By bolstering resistance to heat, structural loads, and radiation, the material could play a crucial role in developing safer and more resilient nuclear infrastructure.
Published in the international journal Materials and Structures, this research was co-authored by Prof. Sharma and research scholar Sanchit Saxena alongside Suman Kumar from the Heritage and Special Structures Department of CSIR-Central Building Research Institute in Roorkee. In future endeavors, the research team aims to scale the developed mortar into a complete concrete mix design and carry out structural-level testing of reinforced concrete elements incorporating the new material. They are also focused on optimizing the microparticle dosage to achieve an optimal balance between strength, durability, workability, and radiation shielding performance. Collaboration with nuclear energy agencies, construction material manufacturers, and infrastructure companies is being pursued to test the developed mortar under simulated field conditions and in pilot-scale applications.
