Effect of hydrogen peroxide treated rubber powder on viscoelasticity of rubber modified asphalt
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摘要: 为了研究废胎胶粉经过氧化氢(H2O2)溶液处理后其孔结构和表观形貌的变化及对所制备橡胶-沥青高温性能的影响,采用三种不同比例的H2O2溶液对废胎胶粉进行表面改性处理,并制备橡胶-沥青。通过胶粉气体吸附试验、扫描电镜试验、沥青旋转黏度试验和动态剪切流变试验分析了不同比例的H2O2溶液对胶粉的孔隙结构、微观形貌和所制备橡胶-沥青的黏度、黏弹性等宏观力学性能的影响规律。结果表明:胶粉经H2O2溶液处理后,平均孔径明显变小,孔体积和孔面积的变化呈现一定的规律;随H2O2溶液比例的增加,胶粉颗粒间接触面增加,表面絮状物和孔隙增多,加强了胶粉与沥青的界面结合度。这使得胶粉中的橡胶烃在沥青中的溶解度增加,炭黑颗粒释放增多,胶粉颗粒的强度、弹性和耐磨性等力学性能下降,导致橡胶-沥青的弹性、黏度和高温抗车辙能力降低。Abstract: The pore structure and surface morphology of rubber powder treated by hydrogen peroxide(H2O2) solution and high temperature performance of crumb rubber modified asphalt prepared from crumb rubber treated by three different proportions of H2O2 solution on the crumb rubber surface modification were studied. The pore structure, micro-morphology of the rubber powder and the viscosity, viscoelasticity of the rubber asphalt were analyzed by the adsorption-desorption experiments, scanning electron microscope test, rotational viscosity test and dynamic shear rheological test. The results show that the average pore size of the rubber powder after treatment with H2O2 solution is significantly smaller, and the pore volume and pore area of the pores change in a certain pattern. With the increase of the proportion of H2O2 solution, the contact surface between the particles increases, the floccule and pores of the powder increase, and the interface degree between the powder and the asphalt is strengthened. In the asphalt, the solubility of the rubber hydrocarbon and release of the carbon black particles of the rubber powder increase, and the mechanical properties such as the strength, elasticity and wear resistance of the rubber powder decrease. As a result, the elasticity, viscosity and high-temperature rutting resistance of the rubber asphalt decrease.
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Key words:
- crumb rubber /
- chemical treatment /
- pore structure /
- surface morphology /
- viscoelasticity
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