Ilya Joohari
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Ilya Joohari
Official Name
Joohari, Ilya
Alternative Name
Joohari, Ilya
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Scopus Author ID
57189305360
Researcher ID
GQQ-0365-2022

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  • Publication
    Hybrid polymerisation: an exploratory study of the chemo-mechanical and rheological properties of hybrid-modified bitumen
    (MDPI, 2020)
    Ilya Joohari
    ;
    Filippo Giustozzi
    In this study, the mechanical and rheological properties of hybrid polymer-modified bitumen (PMB) have been investigated. For this purpose, nine different polymers—including crumb rubber, elastomers and plastomers at varying content—were studied to evaluate their mechanical performance as single polymers, first, and as a combination of two or more polymers as a hybrid polymer blend. Subsequently, the hybrid polymer blends were added in a relatively small percentage into the base bitumen to study its influence on the rheological performance of hybrid PMB. The mechanical properties identified from the analysis of the stress-strain curve of the single polymers were the Young’s Modulus, tensile stress, and elongation at break. The chemical structure of the polymer hybrid blends was analysed using FTIR, followed by frequency sweep tests conducted using the dynamic shear rheometer (DSR) to determine the bitumen rheological properties. Results showed that hybrid PMB enhances the viscoelastic behaviour of bitumen at both low and high temperature compared to other PMBs only including single polymers.
  • Publication
    Enhancing the storage stability of SBS-plastic waste modified bitumen using reactive elastomeric terpolymer
    (Springer, 2023)
    Ilya Joohari
    ;
    Subashani Maniam
    ;
    Filippo Giustozzi
    Polymer-modified bitumen (PMB) with a polymer content of up to 6% has a tendency of experiencing phase separation during hot temperature storage. This paper aims to minimize phase separation of a hybrid PMB that combines styrene butadiene styrene (SBS) and recycled linear low-density polyethylene (R-LLDPE). Reactive elastomeric terpolymer (RET) was used as a compatibilizer and its influence on storage stability was analysed via a series of physical, rheological and chemical tests to investigate phase separation. Softening point test shows that the optimum content of RET is 1%, with a higher content (> 1%) resulting in gel formation. RET increases polarity and reactivity, hence it has the capability of chemically cross-linking the polymers and bitumen. The addition of 0.2% polyphosphoric acid (PPA) improves the performance as it acts as a catalyst that facilitates the chemical reaction. The results from the frequency sweep test found that analysing the complex modulus, phase angle and plotting the black diagram is necessary since the phase separation index based on softening point can be a misleading indicator due to gelation. From the infrared spectroscopy analysis, a similar chemical composition between the top and bottom sections generates comparable absorption peaks and intensity. Finally, fluorescence microscopy indicates a continuous phase, hence displaying a homogeneous dispersion of polymers within the bitumen.