Abstract: To study the degradation damage of the scrap tire rubber pads (STP) under the coupling action of high temperature and load, selected geo-metry size of 180 mm×180 mm×69 mm 6-layers of STP, placed it in high temperature of 100 ℃ and the normal temperature 20 ℃, load of 4 MPa, 5 MPa, 6 MPa under the coupled condition of temperature erosion test of 308 h. Then,scanning electron microscope (SEM) and quasi static loading test, observed the micromorphological changes of rubber molecules, STP deformation process of carbon black and tires mobile appearance, combined with the pseudo-static test results, the mechanism of STP degradation under high temperature-load coupling was comprehensively elucidated. The results show that the coupling action of high temperature and load significantly increases the cross-linking density and local molecular weight of STP rubber surface layer, and the formation of saturated chemical bonds, reduced reactivity and morphological changes of rubber molecules inside STP leads to the maximum increase of the vertical stiffness of STP by 31.9% at 4 MPa. The horizontal equivalent stiffness is increased, but the degradation rate is faster than normal temperature. The vertical deformation performance ratio becomes worse, which is within 2% under different design compressive stresses, the maximum single-lap energy consumption is reduced by 2.5% compared with normal temperature. The research results can provide theoretical reference for the extension and application of new type of under-wall laminated isolation structures in high-intensity rural areas.
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2020, Vol. 34 
