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Steel-Reinforced Polyurethane with Mineral Interlayer for Masonry Protection: Laboratory Tests.

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Existing structures require robust protection methods.
  • Steel-reinforced polyurethane (SRPU) composites offer potential for structural retrofitting.
  • The role of mineral interlayers in SRPU composite performance needs detailed investigation.

Purpose of the Study:

  • To experimentally investigate the performance of a steel-reinforced polyurethane (SRPU) composite system with a mineral interlayer.
  • To evaluate the effect of mineral interlayer thickness and type on the shear bond strength and stiffness of SRPU composites.
  • To assess the influence of mortar properties on the failure modes of SRPU-composite systems applied to brick substrates.

Main Methods:

  • Experimental investigation of SRPU composite systems applied to brick substrates.
  • Inclusion of lime- or cement-based mortar interlayers with thicknesses of 3 mm, 6 mm, and 10 mm.
  • Single-lap shear tests (SLSTs) conducted on specimens with and without mineral interlayers.

Main Results:

  • Specimens without a mineral interlayer exhibited higher load-carrying capacity compared to those with an interlayer.
  • Increasing the thickness of the mineral interlayer led to a reduction in shear bond strength.
  • The shear stiffness of the bond was not significantly affected by the presence or thickness of the mineral interlayer.
  • The mechanical properties of the mortars influenced the observed failure mechanisms.

Conclusions:

  • The mineral interlayer negatively impacts the shear bond strength of SRPU composites, with performance decreasing as interlayer thickness increases.
  • The SRPU system demonstrates significant efficiency in monotonic testing for structural protection applications.
  • Further research into optimizing interlayer properties is recommended to enhance overall system performance.