The lack of understanding of the effects of hybrid fibers on the mechanical properties of geopolymer recycled aggregate concrete

The gap

Evidence profile

Sourced from the future-work section and limitations section and stated research gap of the source papers, classified as general, drawn from work published between 2025 and 2026, spanning 2 journals. Those papers have been cited 20 times in total.

Supporting evidence — 3 representative gaps

• Experimental Investigation of Polypropylene Fiber-Reinforced Concrete Mechanical Properties and Durability (2026) · International Journal of Engineering Science · doi

  Further research may extend this investigation to different concrete grades such as M20, M30, and M40 to understand the performance of polypropylene fibres in various structural applications. Future studies can focus on identifying the most effective fibre percentage and fibre length that provide the best combination of strength, durability, and workability. Additional studies can evaluate the behaviour of PFRC when exposed to harsh conditions.

  generalfuture-work section
  Keywords: further research extend investigation different concrete grades m20
• Study on Mechanical Properties of Coarse-Fine Polypropylene Fiber Blended Concrete (2025) · Buildings · cited 11× · doi

  The study only considered two fiber lengths (30 mm and 50 mm) and three dosages (0.5%, 1%, and 1.5%), - The study did not investigate the effect of other fiber parameters, - The study used a limited number of specimens (three specimens per group) for the compressive strength and splitting tensile strength tests, - The study did not consider the long-term effects of polypropylene fibers on the mechanical properties of concrete

  generallimitations sectionevidence 5/5
  Keywords: study only considered two fiber lengths three dosages
• Experimental Investigation on the Mechanical Properties of Geopolymer Recycled Aggregate Concrete Reinforced with Steel-Polypropylene Hybrid Fiber (2025) · Buildings · cited 9× · doi

  The lack of understanding of the effects of hybrid fibers on the mechanical properties of geopolymer recycled aggregate concrete. The limited knowledge of the synergistic effect of steel and polypropylene fibers on the mechanical properties of GRAC. The need for a comprehensive analysis of the effects of fiber volume fraction, aspect ratio, and recycled aggregate substitution rate on the mechanical properties of HFRGRAC.

  generalstated research gapevidence 5/5
  Keywords: lack understanding effects hybrid fibers mechanical properties geopolymer

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