At a 100% replacement rate, the b -value exhibited a decreasing trend from the beginning, suggesting that the specimen’s compressive resistance had already failed.
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Influence of Recycled Tire Steel Fiber Content on the Mechanical Properties and Fracture Characteristics of Ultra-High-Performance Concrete.
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The sentences
Results revealed a clear trend: mechanical properties initially improved then declined with increasing RTSF content, peaking at 25% replacement.