In the high-stakes world of nuclear power plant construction, time is money, and quality is non-negotiable. A recent study led by D. N. Korotkih of the Joint Stock Company “Institute Orgenergostroy” (JSC OES) and Moscow State University of Civil Engineering (National Research University) (MGSU), has shed new light on how to ensure the strength and quality of monolithic concrete structures using permanent formwork. The research, published in the journal ‘Железобетонные конструкции’, which translates to ‘Reinforced Concrete Structures’, addresses a critical challenge in the industry: how to assess the strength and quality of concrete that is hidden behind permanent formwork.
The study focuses on a technology that uses reinforced formwork blocks made of a reinforcing frame and permanent formwork made of steel fiber concrete. This method, known as precast-monolithic construction, significantly reduces construction time for nuclear power plant structures. However, the lack of direct access to the concrete surface behind the permanent formwork poses a significant challenge for quality control. Traditional non-destructive strength assessment methods fall short in this scenario, leaving potential defects such as caverns and voids undetected.
To tackle this issue, Korotkih and his team conducted experimental studies on a fragment of a reinforced formwork block with laid monolithic concrete. The results were clear: ultrasonic tomography emerged as the optimal method for quality control. “Ultrasonic tomography allows us to detect defects behind the permanent SFRC formwork and also control the parameters of the reinforcement,” Korotkih stated. This method provides a non-invasive way to ensure the integrity of the concrete, which is crucial for the safety and longevity of nuclear power plant structures.
The research also proposed the use of methods for predicting concrete strength based on temperature-time dependencies. This predictive approach could revolutionize the way quality control is managed in the construction of nuclear facilities. By anticipating potential issues before they become critical, construction teams can save time and resources, ultimately leading to more efficient and safer projects.
The implications of this research are significant for the energy sector. As the demand for nuclear power continues to grow, the ability to ensure the quality and strength of concrete structures becomes increasingly important. The findings from Korotkih’s study could shape future developments in the field, leading to more robust and reliable construction methods. By adopting ultrasonic tomography and predictive strength assessment, the industry can move towards a future where quality control is more precise and less invasive, ultimately benefiting both the construction process and the end users of nuclear energy.