Mechanical properties of pultruded glass fiber reinforced plastic after freeze–thaw cycling

A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allows the manufacturing of single- and double-curved textile-reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass fiber–reinforced plastic. Using the unusual structural behavior caused by anisotropy, these glass fiber–reinforced plastic formwork elements permit a specific adjustment of defined curvature. The system design of the developed glass fiber–reinforced plastic formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed, and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads. The developed textile-reinforced concrete had a high three-point bending tensile strength. Beyond that it was ensured that the textile-reinforced concrete had a high durability, which has been shown by the capillary suction of deicing solution and freeze–thaw test with a low amount of scaled material and a relative dynamic E-modulus of 100% after 28 freeze–thaw cycles.

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Mechanical properties of pultruded glass fiber-reinforced plastic after moistening

Composite Structures ◽

10.1016/j.compstruct.2012.04.030 ◽

2012 ◽

Vol 94 (9) ◽

pp. 2914-2919 ◽

Cited By ~ 28

Author(s):

K. Aniskevich ◽

A. Aniskevich ◽

A. Arnautov ◽

J. Jansons

Keyword(s):

Mechanical Properties ◽

Glass Fiber ◽

Fiber Reinforced ◽

Glass Fiber Reinforced Plastic ◽

Fiber Reinforced Plastic ◽

Glass Fiber Reinforced ◽

Reinforced Plastic

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Failure mechanism of woven roving fabric/vinyl ester composites in freeze–thaw saline environment

Journal of Composite Materials ◽

10.1177/0021998316681860 ◽

2016 ◽

Vol 51 (23) ◽

pp. 3269-3280 ◽

Cited By ~ 1

Author(s):

Elias A Toubia ◽

Sadra Emami ◽

Donald Klosterman

Keyword(s):

Glass Fiber ◽

Composite Structures ◽

Substantial Reduction ◽

Fiber Reinforced ◽

Saline Environment ◽

Glass Fiber Reinforced Plastic ◽

Freeze Thaw ◽

Fiber Reinforced Plastic ◽

Glass Fiber Reinforced ◽

Reinforced Plastic

This experimental study investigates the degradation mechanisms of a glass fiber-reinforced plastic material commonly used in civil engineering applications. A substantial reduction in tensile, shear, and compression properties was observed after 100 days of freeze–thaw cycling in saline environment (−20℃ to 20℃). Non-destructive inspection techniques were progressively conducted on unexposed (ambient condition) and exposed (conditioned) specimens. The dynamic mechanical analysis showed permanent decrease in storage modulus that was attributed to physical degradation of the polymer and/or fiber–matrix interface. This indicated the formation of internal cracks inside the exposed glass fiber-reinforced plastic laminate. The 3D X-ray tomography identified preferred damage sites related to intralaminar and interlaminar cracks. The ultrasonic C-scan and optical microscopy showed the nature of the damage and fibers fracture. The thermal cycling events degraded the matrix binding the warp and fill fibers, thus impairing the structural integrity of the cross-ply laminate. The result of this work could benefit a multi-scale durability and damage tolerance model to predict the material state of composite structures under typical service environments.

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