沥青填充式桥梁无缝伸缩缝材料黏弹性试验研究

Experimental Research on Viscoelasticity of Seamless Expansion Joints Material of Asphalt Filled Bridge

以国内生产的沥青填充式桥梁无缝伸缩缝材料(以下简称MUT)为研究对象,采用动态剪切流变仪在8种不同的应力等级下,对其黏弹性进行蠕变试验,并结合一种聚合物模型对试验数据进行拟合,表征并分析了短期老化与温度改变对MUT黏弹性的影响。研究结果表明:短期老化与温度的降低均能够显著降低各个应力等级下的蠕变柔量以及蠕变柔量对于加载时间与加载应力的敏感性,扩大了线性黏弹性的应力范围,增强了MUT抵抗变形的能力;而温度的升高则会造成相反的影响;采用的聚合物模型对于试验结果具有理想的拟合效果,能够良好地表征MUT的黏弹性。

Taking the domestically produced seamless expansion joint material(MUT)of asphalt-filled bridge as researched object,a dynamic shear rheometer is used to conduct a creep test on its viscoelasticity under 8 different stress levels.Combined with one A polymer model,the experimental data are fitted.The impacts of short-term aging and temperature changes on the viscoelasticity of the MUT are characterized and analyzed.The research results show that both short-term aging and temperature reduction can significantly reduce the creep compliance under various stress levels and the sensitivity of creep compliance to loading time and loading stress,expand the stress range of linear viscoelasticity,and enhance the ability of MUT to resist deformation;The increase of temperature will cause the opposite impacts;The applied polymer model has an ideal fitting effect so that it can well characterize the viscoelasticity of MUT.