Investigating Effect of Rheological Properties of Fiber Reinforced Self-Compacting Concrete on Stress-strain Curve

Document Type : Research Article

Authors

Department of civil engineering,, Qazvin Branch, Islamic Azad University, Qazvin, Iran.

Abstract

In fiber reinforced self-compacting concrete, fibers and properties such as filling ability create a homogeneous mixture. In this research, 10 mix designs are examined and tested, one of which is related to the control sample and the other 9 designs include steel, macrosynthetic monofilament (MEX 100), and carbon fiber reinforced polymer (CFRP) fibers with volumetric percentages of 0.25, 0.5 and 0.75. The rheological behavior of fresh self-compacting concrete is investigated by rheometer test. Moreover, conventional tests that determine the self-compacting properties of fresh concrete, including slump flow, J-ring, L-box, U-box, and V-funnel tests, are examined. The behavior of hardened concrete is analyzed based on tests to determine mechanical properties (compressive strength and modulus of elasticity). The results indicate adding fibers to fresh concrete reduces the self-compacting and rheological properties of concrete. This effect becomes more visible by increasing the fiber volume ratio so that the greatest effect could be observed in designs containing CFRP fibers. The results of mechanical properties of hardened concrete show adding small amounts of fibers to self-compacting concrete improves some of these properties, while using large amounts of fibers increases ductility and, consequently, decreases compressive strength and modulus of elasticity in self-compacting concrete.

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 6
September 2023
Pages 1237-1262

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