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<p>The thermal behavior of bitumen BND 70/100 and polymer modified bitumens (PMBs) based on it was studied by methods of simultaneous thermal analysis (STA) and microcalorimetry. The effect of SBS (Styrene–Butadiene–Styrene) polymer and plasticized by vacuum gas oil SBS (P-SBS) polymer on the structural organization of PMBs and their thermal stability was revealed. In the base bitumen, the presence of a crystallizing fraction (CF) was detected. It was found that CF is preserved when P-SBS is introduced into bitumen, but is not preserved when SBS is introduced. It is assumed that the absence of CF when introducing only SBS is associated with an increase in the solvent capacity of the bituminous phase in relation to paraffinic hydrocarbons due to selective adsorption of aromatic hydrocarbons by the SBS. The plasticized SBS has less effect on the solvent capacity of the bituminous phase. It was shown that thermal destruction onset temperature of the base bitumen is much higher than the temperature of preparation of the PMBs, and that the addition of SBS and P-SBS to the base bitumen reduces its resistance to thermal degradation. It was established that the destruction energy of PMBs is significantly higher than that of base bitumen and depends on the composition of the additives introduced. The data obtained indicate the influence of the quality of the used polymer on the internal structure of the bituminous phase, which in turn, has a great influence on the performance characteristics of PMBs.</p>

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Thermal characteristics of polymer modified bitumen according to simultaneous thermal analysis and microcalorimetry investigation

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Yulia Muratovna Ganeeva,
  • Ekaterina Sergeevna Okhotnikova,
  • Tatiana Nikolaevna Yusupova,
  • Nikolay Innokentyevich Bryzgalov,
  • Gulnur Rafisovna Fazylzyanova,
  • Ekaterina Evgenyevna Barskaya,
  • Khamatgalimov Ayrat Raisovich

摘要

The thermal behavior of bitumen BND 70/100 and polymer modified bitumens (PMBs) based on it was studied by methods of simultaneous thermal analysis (STA) and microcalorimetry. The effect of SBS (Styrene–Butadiene–Styrene) polymer and plasticized by vacuum gas oil SBS (P-SBS) polymer on the structural organization of PMBs and their thermal stability was revealed. In the base bitumen, the presence of a crystallizing fraction (CF) was detected. It was found that CF is preserved when P-SBS is introduced into bitumen, but is not preserved when SBS is introduced. It is assumed that the absence of CF when introducing only SBS is associated with an increase in the solvent capacity of the bituminous phase in relation to paraffinic hydrocarbons due to selective adsorption of aromatic hydrocarbons by the SBS. The plasticized SBS has less effect on the solvent capacity of the bituminous phase. It was shown that thermal destruction onset temperature of the base bitumen is much higher than the temperature of preparation of the PMBs, and that the addition of SBS and P-SBS to the base bitumen reduces its resistance to thermal degradation. It was established that the destruction energy of PMBs is significantly higher than that of base bitumen and depends on the composition of the additives introduced. The data obtained indicate the influence of the quality of the used polymer on the internal structure of the bituminous phase, which in turn, has a great influence on the performance characteristics of PMBs.