A collaborative research team has developed a specialized microfibre-reinforced cementitious material designed to streamline the preventive repair of cracked concrete pavements. Published in Cement and Concrete Composites, the study focuses on a commercial belitic calcium sulphoaluminate mortar enhanced with polyvinyl alcohol microfibres (PVAF). By meticulously balancing the material’s ability to flow through an extrusion nozzle with its eventual structural strength, the researchers created a mix that can effectively fill cracks as narrow as 6mm while maintaining the durability required for heavy-duty infrastructure.
The mechanical benefits of this new composite are significant, particularly in how it handles physical stress. When applied to cracked concrete specimens, the microfibre-reinforced mortar resulted in a 30% increase in ultimate strength and doubled the material’s toughness and strain at failure compared to standard repair mixes. These improvements are largely due to the fibres acting as internal bridges that span across micro-cracks, preventing them from expanding and reducing the concentration of stress at the bond between the old concrete and the new repair material.
To make these findings more practical for large-scale engineering, the authors also introduced a rapid “real-to-simulation” workflow that drastically cuts down on testing time. This digital screening process allows researchers to predict how well a repair material will fill a crack in less than an hour, a task that previously required several hours of manual laboratory work. By combining advanced material science with accelerated simulation tools, this research paves the way for more efficient, automated maintenance of transportation networks and urban infrastructure.
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