Effect of Polypropylene Macro-Fiber on Properties of High-Strength Concrete at Elevated Temperatures

Abstract:

After being subjected to different elevated temperatures, ranging between 200 °C and 800 °C, the flexural strength, matrix mass loss rate and water absorption of polypropylene (PP) macro-fiber reinforced high strength concrete (HSC) were investigated. Moreover, the internal damage of concrete was analyzed by the ultrasonic non-destructive testing technology. The results indicate that PP macro-fiber in HSC has an adverse effect on flexural strength, while the synergistic effect of hybrid fibers (PP micro-fiber plus PP macro-fiber) can minimize this effect. Compared with PP micro-fiber, PP macro-fiber is more effective in increasing the matrix mass loss rate and water absorption of HSC. However, if the dosage of PP macro-fiber is too high, the pressure relief channels formed by fibers melt will be too coarse, and the total porosity of HSC will be increased significantly. Finally, a mathematical model relating the damage degree to temperature was established based on the non-linear fitting of the experimental data.

• Periodical: Key Engineering Materials (Volumes 629-630)
• Pages: 284-290
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.629-630.284
• Online since: October 2014
• Authors: Xu Jing Niu*, Qing Xin Zhao, Ying Nie
• Keywords: Damage Degree, Flexural Strength, High-Strength Concrete (HSC), Matrix Mass Loss Rate, Polypropylene Macro-Fiber, Temperature, Water Absorption Rate

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