Zhang Wengang, Jia Zhirong, Zhang Yixia, Hu Kui, Ding Longting, Wang Fang
School of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255049, China.
School of Engineering and Information Technology, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
Polymers (Basel). 2019 Jan 15;11(1):140. doi: 10.3390/polym11010140.
Five types of material, styrene-butadiene-styrene block copolymer (SBS), ethyl-vinyl-acetate (EVA), naphthenic oil, maleic anhydride grafted ethylene-vinyl acetate copolymer (EVA--MAH) and butylated hydroxytoluene (BHT) were used as the raw ingredients for manufacturing direct-to-plant SBS in this paper. Thirteen kinds of direct-to-plant SBS with different EVA/SBS and naphthenic oil/SBS were prepared as well as the processes diagrammatic sketch of dispersion and swelling of direct-to-plant SBS modifier in bitumen were discussed. Microscopic images of direct-to-plant SBS modified bitumen with different components were obtained using fluorescence microscopy. The micro-images were analysed and quantified with MATLAB software. The influence of key components on the micro-morphology of direct-to-plant SBS-modified bitumen is discussed, followed with the tests on melting points and the melting indexes of direct-to-plant SBS with different EVA/SBS and naphthenic oil/SBS. The performances test of bitumen and bituminous mixture modified by these direct-to-plant SBS were also conducted. Results show that, with the ratio improvement of EVA/SBS or naphthenic oil/SBS, the number of the pixel dot number of area (SBS) in microscopic images increased. Enlargement of the pixel dot number of centre line elongate and the structure fineness was observed, indicating that the dispersion and swelling effect of the SBS modifier in bitumen had been improved. Meanwhile, the macro index, such as the melting point and melting index of direct-to-plant SBS, was also improved corresponding to the increase of EVA/SBS ratio or naphthenic oil/SBS ratio. With the addition of EVA or naphthene oil content, penetration and ductility of direct-to-plant SBS modified bitumen received gradual enhancement, but the softening point and viscosity were found out to be decreased. The high-temperature and low-temperature performances of direct-to-plant SBS modified bituminous mixture can be effectively improved by adding EVA or naphthenic oil. By meeting the required performances of direct-to-plant SBS, modified bitumen and bituminous mixture, the component of direct-to-plant SBS is recommended as, SBS:EVA:naphthenic oil:EVA--MAH:BHT is 1:0.1⁻0.5:0.05⁻0.2:0.03:0.05. For the compatibleness of SBS with different bitumen are different, necessary tests verification is recommended to be carried out prior to usage.
本文选用苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）、乙烯-醋酸乙烯酯共聚物（EVA）、环烷油、马来酸酐接枝乙烯-醋酸乙烯酯共聚物（EVA-MAH）和丁基化羟基甲苯（BHT）5种材料作为制备直接用于植物的SBS的原料。制备了13种不同EVA/SBS和环烷油/SBS比例的直接用于植物的SBS，并探讨了直接用于植物的SBS改性剂在沥青中的分散和溶胀过程示意图。利用荧光显微镜获得了不同组分的直接用于植物的SBS改性沥青的微观图像。使用MATLAB软件对微观图像进行了分析和量化。讨论了关键组分对直接用于植物的SBS改性沥青微观形态的影响，随后对不同EVA/SBS和环烷油/SBS比例的直接用于植物的SBS的熔点和熔融指数进行了测试。还对这些直接用于植物的SBS改性的沥青和沥青混合料进行了性能测试。结果表明，随着EVA/SBS或环烷油/SBS比例的提高，微观图像中区域（SBS）的像素点数增加。观察到中心线伸长的像素点数增大且结构细化，表明SBS改性剂在沥青中的分散和溶胀效果得到改善。同时，直接用于植物的SBS的宏观指标，如熔点和熔融指数，也随着EVA/SBS比例或环烷油/SBS比例的增加而相应提高。随着EVA或环烷油含量的增加，直接用于植物的SBS改性沥青的针入度和延度逐渐提高，但软化点和粘度降低。添加EVA或环烷油可有效改善直接用于植物的SBS改性沥青混合料的高温和低温性能。通过满足直接用于植物的SBS、改性沥青和沥青混合料的性能要求，建议直接用于植物的SBS的组成为：SBS:EVA:环烷油:EVA-MAH:BHT为1:0.1⁻0.5:0.05⁻0.2:0.03:0.05。由于SBS与不同沥青的相容性不同，建议在使用前进行必要的试验验证。
