Yazar "Akarken, Gurkan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Fabrication and characterization of metakaolin-based fiber reinforced fire resistant geopolymer
    (Elsevier, 2023) Akarken, Gurkan; Cengiz, Ugur
    Geopolymers have many advantages over Portland cement, such as low energy cost, reduced greenhouse gas emissions, high compressive strength, high-temperature stability, low thermal conductivity, and high strength at an early age. This study obtained fiber-reinforced geopolymer composite (FRGC) structures using metakaolin (MK) basalt and glass fiber, and the fire-resistant FRGC structure was developed. The morphology, structure, and thermal characterization of fire-resistant FRGC were obtained using SEM, TEM, XRD, XRF, FTIR, and TGA. As a result of SEM, FT-IR, and TGA analyses, it was observed that high-temperature geopolymer samples retained their stable structure. The SEM images also indicated the fiber's effect on preventing surface cracking. Fireresistant properties were tested by heat exposure in a muffle furnace for thermal behavior of 200, 400, and 800 degrees C. The mechanical stability of the FRGC blocks was tested using the compression test before and after exposure to high temperatures. In this test, the FRGC block, kept for one hour at 200 degrees C, still has the compressive strength at the high strength concrete class and can be used in skyscrapers (51-76 MPa).
  • [ X ]
    Öğe
    Self-cleaning superhydrophobic polyester resin production for gel coat applications
    (Elsevier Science Sa, 2025) Akarken, Gurkan; Cengiz, Ugur; Ozturk, Nagihan; Balkaner, Ceyda
    This research aimed to develop a superhydrophobic unsaturated polyester resin for gel coat applications, hypothesizing that modifying the primary component, polyester resin, to be superhydrophobic would impart the same property to the gel coat. To achieve this, coating solutions were prepared using two different strategies. The first approach involved complementing resin modification with a condensation reaction. The second strategy involved modifying the polyester resin through simultaneous radicalization and condensation polymerization. The superhydrophobic, self-cleaning gel coat applications were applied using a spray coating technique. Subsequently, wettability tests, including contact angle measurements and self-cleaning performance assessments, as well as surface morphology analyses using SEM, AFM, and XPS, were conducted. Additionally, structural characterizations of the composite material were performed using FTIR, XRD, and TGA. The water contact angle of the unmodified polyester resin, initially 84 degrees, increased to 173 degrees, demonstrating the successful production of superhydrophobic polyester resin. It is believed that the produced gel coat will not only result in significant labor savings due to its self-cleaning properties and corrosion protection but will also reduce the use of environmentally harmful cleaning agents.