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<p>The use of quartz sand as a filler and reinforcing material is a common practice in the manufacture of glass fiber-reinforced composite pipes. In this study, the influence of the use of discarded foundry sand (DFS) in the development of poly(vinyl chloride)-PVC pipes coated with polyester and glass fiber composites (RPVC) produced by hand lay-up lamination was evaluated. Physical and mechanical properties were assessed, making a comparison in three different configurations: RPVC without the addition of DFS, RPVC with the addition of 1 layer of DFS, and RPVC with 2 layers of DFS. The pipes were manufactured using hand lay-up lamination. The main results indicated that, as observed through the morphological analysis and physical characterization of the composites, the increase in the DFS content in the RPVC pipes increased the values of void content in the composites and, consequently, a higher water absorption. Hydrostatic pressure test results showed that the addition of layers containing DFS increased the burst pressure of the pipes compared to the burst pressure values of the pipe without sand. As for the results regarding the mechanical resistance and stiffness, it was observed that the incorporation of DFS layers enhanced the stiffness when compared to the analogue without the addition of DFS.</p>

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Poly(Vinyl Chloride) Pipes Coated with Polyester and Fiberglass Composites with Different Layers of Foundry Sand Residue

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • M. A. Bernardo,
  • E. Junca,
  • R. de Bonna,
  • A. M. Bernardin,
  • M. V. G. Zimmermann

摘要

The use of quartz sand as a filler and reinforcing material is a common practice in the manufacture of glass fiber-reinforced composite pipes. In this study, the influence of the use of discarded foundry sand (DFS) in the development of poly(vinyl chloride)-PVC pipes coated with polyester and glass fiber composites (RPVC) produced by hand lay-up lamination was evaluated. Physical and mechanical properties were assessed, making a comparison in three different configurations: RPVC without the addition of DFS, RPVC with the addition of 1 layer of DFS, and RPVC with 2 layers of DFS. The pipes were manufactured using hand lay-up lamination. The main results indicated that, as observed through the morphological analysis and physical characterization of the composites, the increase in the DFS content in the RPVC pipes increased the values of void content in the composites and, consequently, a higher water absorption. Hydrostatic pressure test results showed that the addition of layers containing DFS increased the burst pressure of the pipes compared to the burst pressure values of the pipe without sand. As for the results regarding the mechanical resistance and stiffness, it was observed that the incorporation of DFS layers enhanced the stiffness when compared to the analogue without the addition of DFS.