In the quest for more durable and sustainable concrete structures, a team of researchers led by Didier Snoeck from the BATir Department at the Université Libre de Bruxelles (ULB) has introduced an innovative approach to self-healing concrete. Their work, published in the journal *Developments in the Built Environment* (translated to English as “Advances in the Built Environment”), focuses on enhancing the longevity and performance of concrete through the use of specially designed crack repair sticks. This research could have significant implications for the energy sector, where the integrity of concrete structures is paramount.
The team’s novel method involves applying crack repair sticks containing a mixture of cement, crystalline admixtures (CA), expansive agents (EA), and superabsorbent polymers (SAP) to cracked concrete surfaces. The sticks are designed to promote autogenous healing, a process where the concrete repairs itself without external intervention. The researchers subjected the treated concrete to a series of wet/dry curing cycles and assessed the healing efficiency through water permeability tests and repeated tensile tests.
The results were promising. The treated concrete showed a significant reduction in water flow, up to a factor of 102, indicating a substantial regain in impermeability. Mechanical properties also partially recovered, with some samples achieving up to 100% recovery due to autogenous healing. “The admixtures react with hydration products and moisture in the crack to form additional crystals, physically sealing the crack,” explained Snoeck. This sealing mechanism not only enhances the durability of the concrete but also contributes to its sustainability by reducing the need for frequent repairs.
The research highlights the potential of crystalline admixtures, with or without expansive agents, as the most effective components in the crack repair sticks. These admixtures react with the concrete’s hydration products and moisture to form crystals that seal the cracks, thereby restoring the concrete’s integrity.
The implications for the energy sector are substantial. Concrete structures, such as those used in energy infrastructure, are often exposed to harsh environmental conditions that can lead to cracking and degradation. The ability to self-heal these cracks can extend the lifespan of these structures, reducing maintenance costs and enhancing safety. “This technology could revolutionize the way we approach concrete repair and maintenance in the energy sector,” said Snoeck. “By incorporating these self-healing mechanisms, we can create more resilient and sustainable infrastructure.”
The research published in *Developments in the Built Environment* opens up new avenues for innovation in the construction industry. As the demand for sustainable and durable materials grows, the adoption of self-healing concrete could become a standard practice. This could lead to a paradigm shift in how we design, build, and maintain concrete structures, ultimately contributing to a more sustainable and resilient built environment.
The findings of this study not only underscore the importance of ongoing research in materials science but also highlight the potential for practical applications that can benefit various industries. As the energy sector continues to evolve, the integration of self-healing concrete could play a crucial role in ensuring the longevity and reliability of critical infrastructure.