Abstract
This paper presents fiber-reinforced polymer composites which were modified by fibers hybridization as well as matrix nanomodifiaction with nanosilica. The article analyzed the nanosilica matrix modification and basalt-carbon hybridization’s effect on key properties of composites use as the main reinforcement in concrete structures. The comparative analysis was based on results of bars strength parameters determined in a shear test with the ASTM standard. The tests were performed for three bar diameters at room temperature and pre-heated FRP composites at 80 °C and 200 °C for 2 h with the aim of verifying the influence of the fiber hybridization-basalt-carbon fiber-reinforced polymer (HFRP) bars and the effect of nanosilica modification of the epoxy matrix (nHFRP). The test results were also compared with results of the shear test carried out after the bars were heated to 80 °C for 30 min in order to verify and evaluate the effect of the heating time. These types of tests are relevant to the conditions that occur in FRP composites when exposed to elevated temperatures.
Highlights
Polymers 2021, 13, 2585. https://In recent years, fiber-reinforced polymers (FRP) composites have been widely used in civil engineering
We investigated the three diameters of three types of bars developed at the Warsaw University of Technology: BFRP and hybridization-basaltcarbon fiber-reinforced polymer (HFRP) to increase the stiffness of the BFRP bars by replacing 25% of the basalt fibers with carbon fibers and nHFRP-hybrid FRP containing an epoxy matrix modified with 3%
For HFRP Ø4 bars, both at temperatures of 80 ◦ C and 200 ◦ C, values fell to 5%, so the temperature effect can be considered insignificant
Summary
Fiber-reinforced polymers (FRP) composites have been widely used in civil engineering. FRP are well-known for their high strength, stiffness, and corrosion resistance. Strength and stiffness are mainly derived from fibers and the matrix binds fiber together [1]. Together with the strengthening, must form a coherent interface, most often on the basis of an adhesive and mechanical connection, which allows the transfer of loads from the matrix to reinforcement [2]. These are the conditions for obtaining good properties of the resulting composite material. FRP’s mechanical properties are influenced by the content of the fiber fraction, the distribution of fibers in the core of bar, accuracy of the fiber coating in the resin, the type of resin, and the matrix modification [3]; a complex approach in research composite properties is extremely important
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