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Freeze-Thaw Resistance of Fiber Reinforced Composites with Superhydrophobic Admixtures
Freezing and thawing cycles in northern regions lead to serious deterioration in bridges and dictate the need for early repair or replacement. The use of polyvinyl alcohol (PVA) fibers in cementitious composites improves durability because of their ability to withstand large deformations due to its strain-hardening and multi-cracking ability. However, the addition of fibers alone to a cementitious matrix may not be adequate in providing resistance to freezing and thawing beyond the standard 300 cycles. The addition of superhydrophobic admixtures to fiber-reinforced composites results in an air void system with small, well-dispersed air voids allowing for better resistance to freezing and thawing. Moreover, the superhydrophobicity of the air void surface provides a water-repellent effect, ensuring that water does not attach to the surface of the air voids. This research demonstrates that the addition of superhydrophobic admixtures to fiber-reinforced composites provides improved freeze-thaw resistance by demonstrating a durability factor of 100 through as many as 700 accelerated (-50°C to 20°C) freeze-thaw cycles in fresh water and 5% NaCl solution. Additionally, the accelerated freeze-thaw testing provides a more efficient method for testing freezing and thawing in cementitious materials.
Freeze-Thaw Resistance of Fiber Reinforced Composites with Superhydrophobic Admixtures
Freezing and thawing cycles in northern regions lead to serious deterioration in bridges and dictate the need for early repair or replacement. The use of polyvinyl alcohol (PVA) fibers in cementitious composites improves durability because of their ability to withstand large deformations due to its strain-hardening and multi-cracking ability. However, the addition of fibers alone to a cementitious matrix may not be adequate in providing resistance to freezing and thawing beyond the standard 300 cycles. The addition of superhydrophobic admixtures to fiber-reinforced composites results in an air void system with small, well-dispersed air voids allowing for better resistance to freezing and thawing. Moreover, the superhydrophobicity of the air void surface provides a water-repellent effect, ensuring that water does not attach to the surface of the air voids. This research demonstrates that the addition of superhydrophobic admixtures to fiber-reinforced composites provides improved freeze-thaw resistance by demonstrating a durability factor of 100 through as many as 700 accelerated (-50°C to 20°C) freeze-thaw cycles in fresh water and 5% NaCl solution. Additionally, the accelerated freeze-thaw testing provides a more efficient method for testing freezing and thawing in cementitious materials.
Freeze-Thaw Resistance of Fiber Reinforced Composites with Superhydrophobic Admixtures
Muzenski, Scott (author) / Flores-Vivian, Ismael (author) / Sobolev, Konstantin (author)
Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9) ; 2013 ; Cambridge, Massachusetts, United States
2013-09-23
Conference paper
Electronic Resource
English
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