AL-Masraf, H., AL-Attar, T., Freyyah, Q. (2024). Mechanical and thermal performance of engineered cementitious composite concrete produced by using polyvinyl alcohol fibers. , 42(11), 1290-1303. doi: 10.30684/etj.2024.146641.1691
Harith M. AL-Masraf; Tareq S. AL-Attar; Qais J. Freyyah. "Mechanical and thermal performance of engineered cementitious composite concrete produced by using polyvinyl alcohol fibers". , 42, 11, 2024, 1290-1303. doi: 10.30684/etj.2024.146641.1691
AL-Masraf, H., AL-Attar, T., Freyyah, Q. (2024). 'Mechanical and thermal performance of engineered cementitious composite concrete produced by using polyvinyl alcohol fibers', , 42(11), pp. 1290-1303. doi: 10.30684/etj.2024.146641.1691
AL-Masraf, H., AL-Attar, T., Freyyah, Q. Mechanical and thermal performance of engineered cementitious composite concrete produced by using polyvinyl alcohol fibers. , 2024; 42(11): 1290-1303. doi: 10.30684/etj.2024.146641.1691

Mechanical and thermal performance of engineered cementitious composite concrete produced by using polyvinyl alcohol fibers

Engineering and Technology Journal
Volume 42, Issue 11, November 2024, Pages 1290-1303    PDF (1.57 M)
Document Type: Research Paper
DOI: 10.30684/etj.2024.146641.1691
Authors
Harith M. AL-Masraf* ; Tareq S. AL-Attar; Qais J. Freyyah
Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
Abstract
The inclusion of polyvinyl alcohol fiber (PVA) into an engineered cementitious composite (ECC) material is essential to impart mechanical and thermal properties, in addition to the enhancement of porosity and microstructural properties. Therefore, this improvement can be achieved by utilizing four different percentages of fiber (0.5, 1, 1.5, 2)%, replaced by volume. Five mixes of (PVA-ECC) of M25 grade strength were produced and tested at three different ages (7, 28, and 90) days. Because of the more porous structure of (PVA-ECC), the results demonstrated that adding 2% by weight of (PVA) fiber to (PVA-ECC) dramatically lowered its thermal conductivity by 36.5% compared to traditional concrete. However, more thermal energy can be captured and concentrated at the cement paste surface with the increasing amount of (PVA) fiber, causing an increment in thermal load and negatively affecting thermal insulating efficiency. Furthermore, compressive strength results revealed an upward trend as the fiber content increased up to 1.5% of (PVA) fiber, demonstrating the maximum improvement in strength. On the other hand, the achievement of 55% of the modulus of rupture by inclusion (2%) (PVA) fiber reveals that the modulus of rupture is mainly influenced by (PVA) fiber inclusion. Finally, there is confidence that the reduced thermal conductivity, hydrophobic surface nature, and improved mechanical characteristics of (PVA-ECC) can meet the demanding standards of environmentally friendly building construction.

Highlights
  • PVA fibers reduce water absorption by about (17%) compared to traditional concrete.
  • The inclusion of (PVA) fiber in ECC is essential for obtaining higher strengths.
  • PVA fibers improved compressive strength by 19% compared to conventional concrete.
  • Thermal insulation can be enhanced by incorporating higher percentages of PVA fiber.
  • The higher tensile strain of (3.3)% can be achieved using (PVA) fiber up to (2)%.
Keywords
Engineered cementitious composite; Compressive strength; Microstructural investigation; Modulus of rupture; Thermal conductivity
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