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Enhancing the hydrophobic PP fiber/cement matrix interface by coating nano-AlOOH to the fiber surface in a facile method
https://orcid.org/0000-0002-0908-2378
https://orcid.org/0000-0003-3002-038X
Abstract A variety of fiber surface modification methods, based on oxidation or coating, have been developed to improve the weak hydrophobic polymer fiber/cement matrix interface, which is critical for the mechanical properties of fiber-reinforced cement-based materials. However, these methods require special equipment for oxidizing the fiber, consumes costly raw materials for synthesizing the coating layer, or produces massive waste of organic solvent. This study improves the interface between the hydrophobic polypropylene (PP) fiber and the cement matrix, by synthesizing and coating AlOOH with a facile method without any of the drawbacks above. Material characterizations (SEM-EDS, FTIR, XPS, and XRD) of the treated fiber confirms nano-plates of γ-AlOOH are successfully coated onto the fiber surface. The water contact angle test and the characterization of the precipitates on the fiber after conditioning in mimic cement pore solutions (saturated Ca(OH)2 w/or w/o sulfates) are conducted. The results indicate that AlOOH coating enhances wettability and chemical reactivity of the fiber, respectively. In the presence of sulfate, AFm and AFt (ettringite) are found in the precipitates, showing the effectiveness of engaging the sulfates in cement of AlOOH coating. Single-fiber pull-out test shows that the coating enhanced the frictional bond and the energy absorption at the interface by 113% and 80% respectively, which is among the most enhanced in comparison with previously reported fiber treatments. The significant enhancement can be attributed to the more densified and more tortuous fiber/matrix interface.
Enhancing the hydrophobic PP fiber/cement matrix interface by coating nano-AlOOH to the fiber surface in a facile method
https://orcid.org/0000-0002-0908-2378
https://orcid.org/0000-0003-3002-038X
Abstract A variety of fiber surface modification methods, based on oxidation or coating, have been developed to improve the weak hydrophobic polymer fiber/cement matrix interface, which is critical for the mechanical properties of fiber-reinforced cement-based materials. However, these methods require special equipment for oxidizing the fiber, consumes costly raw materials for synthesizing the coating layer, or produces massive waste of organic solvent. This study improves the interface between the hydrophobic polypropylene (PP) fiber and the cement matrix, by synthesizing and coating AlOOH with a facile method without any of the drawbacks above. Material characterizations (SEM-EDS, FTIR, XPS, and XRD) of the treated fiber confirms nano-plates of γ-AlOOH are successfully coated onto the fiber surface. The water contact angle test and the characterization of the precipitates on the fiber after conditioning in mimic cement pore solutions (saturated Ca(OH)2 w/or w/o sulfates) are conducted. The results indicate that AlOOH coating enhances wettability and chemical reactivity of the fiber, respectively. In the presence of sulfate, AFm and AFt (ettringite) are found in the precipitates, showing the effectiveness of engaging the sulfates in cement of AlOOH coating. Single-fiber pull-out test shows that the coating enhanced the frictional bond and the energy absorption at the interface by 113% and 80% respectively, which is among the most enhanced in comparison with previously reported fiber treatments. The significant enhancement can be attributed to the more densified and more tortuous fiber/matrix interface.
Enhancing the hydrophobic PP fiber/cement matrix interface by coating nano-AlOOH to the fiber surface in a facile method
https://orcid.org/0000-0002-0908-2378
https://orcid.org/0000-0003-3002-038X
Abstract A variety of fiber surface modification methods, based on oxidation or coating, have been developed to improve the weak hydrophobic polymer fiber/cement matrix interface, which is critical for the mechanical properties of fiber-reinforced cement-based materials. However, these methods require special equipment for oxidizing the fiber, consumes costly raw materials for synthesizing the coating layer, or produces massive waste of organic solvent. This study improves the interface between the hydrophobic polypropylene (PP) fiber and the cement matrix, by synthesizing and coating AlOOH with a facile method without any of the drawbacks above. Material characterizations (SEM-EDS, FTIR, XPS, and XRD) of the treated fiber confirms nano-plates of γ-AlOOH are successfully coated onto the fiber surface. The water contact angle test and the characterization of the precipitates on the fiber after conditioning in mimic cement pore solutions (saturated Ca(OH)2 w/or w/o sulfates) are conducted. The results indicate that AlOOH coating enhances wettability and chemical reactivity of the fiber, respectively. In the presence of sulfate, AFm and AFt (ettringite) are found in the precipitates, showing the effectiveness of engaging the sulfates in cement of AlOOH coating. Single-fiber pull-out test shows that the coating enhanced the frictional bond and the energy absorption at the interface by 113% and 80% respectively, which is among the most enhanced in comparison with previously reported fiber treatments. The significant enhancement can be attributed to the more densified and more tortuous fiber/matrix interface.
Enhancing the hydrophobic PP fiber/cement matrix interface by coating nano-AlOOH to the fiber surface in a facile method
Wu, Bo (author) / Qiu, Jishen (author)
2021-10-07
Article (Journal)
Electronic Resource
English
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