Effects of polypropylene fibres and micro silica on the strength and fire resistance of M40 grade concrete
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Full Text |
Pdf
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Author |
Sivi Varghese, Amal S. George, Meet Panchal, M. Shahnawaz Khan and Seema Shajira
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e-ISSN |
1819-6608 |
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On Pages
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761-769
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Volume No. |
21
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Issue No. |
12
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Issue Date |
August 20, 2026
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DOI |
https://doi.org/10.59018/062681
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Keywords |
polypropylene fiber, micro silica, compressive strength, thermal resistance, impact resistance.
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Abstract
This study evaluates the effects of polypropylene (PP) fibers and micro silica additives on the mechanical and thermal performance of concrete. Four concrete mixes (M0 to M3) with varying additive proportions were tested for compressive strength, split tensile strength, impact resistance, heat penetration, and structural integrity after exposure to elevated temperatures (300°C and 800°C). Results show that micro silica significantly enhances compressive and tensile strength by improving bonding and matrix density, with Specimen M3 achieving the highest strength. Excessive PP fiber content in Specimen M2 reduced strength due to poor bonding and increased porosity. Impact resistance improved with a balanced combination of fibers and micro silica, while thermal exposure tests revealed Specimen M1 retained superior residual strength and structural integrity. Heat penetration was lowest in specimens with additives, indicating better thermal insulation. Moreover, specimens with additives resisted shattering upon impact, highlighting improved toughness. Overall, optimized use of PP fibers and micro silica improves concrete’s strength, durability, and fire resistance, making it suitable for high-performance construction applications.
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