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Performance of self-compacting concrete at room and after elevated temperature incorporating Silica fume

  • Ahmad, Subhan (Department of Civil Engineering, Aligarh Muslim University) ;
  • Umar, Arshad (Department of Civil Engineering, Aligarh Muslim University) ;
  • Masood, Amjad (Department of Civil Engineering, Aligarh Muslim University) ;
  • Nayeem, Mohammad (Department of Civil Engineering, Aligarh Muslim University)
  • Received : 2017.12.30
  • Accepted : 2018.12.26
  • Published : 2019.02.25
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Abstract

This paper evaluates the workability and hardened properties of self-compacting concrete (SCC) containing silica fume as the partial replacement of cement. SCC mixtures with 0, 2, 4, 6, 8 and 10% silica fume were tested for fresh and hardened properties. Slump flow with $T_{500}$ time, L-box and V-funnel tests were performed for evaluating the workability properties of SCC mixtures. Compressive strength, splitting tensile strength and modulus of rupture were performed on hardened SCC mixtures. Experiments revealed that replacement of cement by silica fume equal to and more than 4% reduced the slump flow diameter and increased the $T_{500}$ and V-funnel time linearly. Compressive strength, splitting tensile strength and modulus of rupture increased with increasing the replacement level of cement by silica fume and were found to be maximum for SCC mixture with 10% silica fume. Further, residual hardened properties of SCC mixture yielding maximum strengths (i.e., SCC with 10% silica fume) were determined experimentally after heating the concrete samples up to 200, 400, 600 and $800^{\circ}C$. Reductions in hardened properties up to $200^{\circ}C$ were found to be very close to normal vibrated concrete (NVC). For 400 and $600^{\circ}C$ reductions in hardened properties of SCC were found to be more than NVC of the same strength. Explosive spalling occurred in concrete specimens before reaching $800^{\circ}C$.

Keywords

References

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