Affordable Access

Hybrid Reinforcement of Sisal and Polypropylene Fibers in Cement-Based Composites

Authors
Journal
Journal of Materials in Civil Engineering
0899-1561
Publisher
American Society of Civil Engineers
Publication Date
Keywords
  • Accelerated Aging
  • Cellulosic Fibers
  • Composites
  • Durability
  • Polypropylene Fibers
  • Portland Cement
  • Refinement
  • Sisal Fibers
  • Vegetable Fibers

Abstract

Several studies using vegetable fibers as the exclusive reinforcement in fiber-cement composites have shown acceptable mechanical performance at the first ages. However, after the exposure to accelerated aging tests, these composites have shown significant reduction in the toughness or increase in embrittlement. This was mainly attributed to the improved fiber-matrix adhesion and fiber mineralization after aging process. The objective of the present research was to evaluate composites produced by the slurry dewatering technique followed by pressing and air curing, reinforced with combinations of polypropylene fibers and sisal kraft pulp at different pulp freeness. The physical properties, mechanical performance, and microstructural characteristics of the composites were evaluated before and after accelerated and natural aging. Results showed the great contribution of pulp refinement on the improvement of the mechanical strength in the composites. Higher intensities of refinement resulted in higher modulus of rupture for the composites with hybrid reinforcement after accelerated and natural aging. The more compact microstructure was due to the improved packing of the mineral particles with refined sisal pulp. The toughness of the composites after aging was maintained in relation to the composites at 28 days of cure.

There are no comments yet on this publication. Be the first to share your thoughts.