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Computers and Concrete
  Volume 5, Number 1, February 2008, pages 21-36

A new strength model for the high-performance fiber reinforced concrete
P. Ramadoss and K. Nagamani

    Steel fiber reinforced concrete is increasingly used day by day in various structural applications. An extensive experimentation was carried out with w/cm ratio ranging from 0.25 to 0.40, and fiber content ranging from zero to1.5 percent by volume with an aspect ratio of 80 and silica fume replacement at 5%, 10% and 15%. The influence of steel fiber content in terms of fiber reinforcing index on the compressive strength of high-performance fiber reinforced concrete (HPFRC) with strength ranging from 45 85 MPa is presented. Based on the test results, equations are proposed using statistical methods to predict 28-day strength of HPFRC effecting the fiber addition in terms of fiber reinforcing index. A strength model proposed by modifying the mix design procedure, can utilize the optimum water content and efficiency factor of pozzolan. To examine the validity of the proposed strength model, the experimental results were compared with the values predicted by the model and the absolute variation obtained was within 5 percent.
Key Words
    silica fume; crimped steel fibers; fiber reinforcing index; high-performance fiber reinforced concrete; compressive strength; modeling, prediction.
Structural Engineering Division, Department of Civil Engineering, Anna University, Chennai-600025, India

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