Investigation of the Mechanical Properties and Fracture Characteristics of Fiber-Reinforced Geopolymer Concrete Using Recycled Fibers

Document Type : Research Paper

Authors

Department of Civil Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.

Abstract

Geopolymer concrete, as a sustainable alternative to Portland cement, is produced through the alkaline activation of pozzolanic materials. This type of concrete offers several environmental advantages, notably the reduction of CO₂ emissions. However, one of its main drawbacks is its relatively low flexural strength. The incorporation of fibers can enhance its ductility and reduce brittleness by bridging cracks and increasing deformation capacity.

In this study, six geopolymer concrete mix designs were prepared using 8, 10, and 12 molar sodium hydroxide solutions for pozzolan activation. To improve mechanical properties, recycled tire cord fibers were incorporated into the mixes. The specimens were cured under three different conditions: ambient temperature, 60°C, and 100°C. Compressive strength, flexural strength, fracture energy, and elastic modulus were measured for each case.

The results showed that increasing the concentration of the sodium hydroxide solution led to a 7 to 32% reduction in compressive strength, flexural strength, and modulus of elasticity, while the 8-molar solution exhibited the best performance. Using 1% recycled tire cord fibers increased the compressive strength and modulus of elasticity by 9 to 50% compared to the 2% dosage. In contrast, specimens containing 2% fibers improved the flexural strength and fracture energy by 2 to 6%, indicating enhanced toughness. Curing at temperatures of 60 and 100°C accelerated strength development, achieving 88 to 95% of the ultimate strength within 72 hours. The obtained results indicate that geopolymer concrete has the potential to replace conventional concrete, and recycled tire cord fibers improve its performance.

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Main Subjects

References

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