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Study of the Influence of Polyamide Filler on the Physical and Mechanical Properties of High-Strength Concrete
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Researchers tested polyamide fillers — including PA-6 granules, fibers, and recycled waste — as additives in high-strength concrete, finding that surface modification with inorganic salt solutions significantly improved compressive strength, with 10% PA-6 granules plus 1% CaCl₂-treated fibers achieving a peak strength of 106.4 MPa at 28 days.
The article investigates the influence of various polyamide fillers (granulated polyamide PA-6, polyamide fibers, and polyamide waste) on the physico-mechanical properties of high-strength concrete. It has been established that surface modification of the fillers using inorganic salt solutions (CaCl₂, Al₂(SO4)3, and Ca(NO3)2) can affect the hydration processes of the cement matrix and enhance interfacial interactions, which in turn improve the strength and durability of the concrete. The highest compressive strength (fcs₂ = 72.8 MPa; fcs₂₈ = 106.4 MPa) was achieved using 10 wt.% of PA-6 granules and 1.0 wt.% of fibers modified in a 30% CaCl₂ solution. This combination provides effective reinforcement of the concrete structure, reduces the likelihood of crack formation, and contributes to improved performance characteristics. Additionally, the use of polyamide waste as a filler represents a promising approach to polymer material recycling with a positive environmental impact.
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