In this paper,phenyl silicone rubber is reinforced by precipitated silica which preconditioned with Hexamethyldisilazane.Their damping performance and thermal stability in the air are characterized by rheological test...In this paper,phenyl silicone rubber is reinforced by precipitated silica which preconditioned with Hexamethyldisilazane.Their damping performance and thermal stability in the air are characterized by rheological test and TG respectively.Results show that the complex viscosity,storage modulus,loss modulus and damping factor of the filling type silicone rubber are improved.展开更多
为研究超硬质沥青(super hard asphalt,SHA)对超硬质沥青结合料的高、低温流变的影响效果,采用SHA作为改性剂对AH-90道路石油沥青进行改性,制备了不同质量分数(5%、6%、7%和8%)的SHA改性结合料,并进行动态剪切流变试验、多应力蠕变恢复...为研究超硬质沥青(super hard asphalt,SHA)对超硬质沥青结合料的高、低温流变的影响效果,采用SHA作为改性剂对AH-90道路石油沥青进行改性,制备了不同质量分数(5%、6%、7%和8%)的SHA改性结合料,并进行动态剪切流变试验、多应力蠕变恢复试验及小梁弯曲蠕变试验.试验结果表明:其适用于时温等效原理;SHA的掺入会有效提高沥青结合料的车辙因子G*/sinδ,沥青混合料的高温性能得到明显改善;随着SHA掺量的增加,沥青结合料的平均应变恢复率R逐渐升高,不可恢复蠕变柔量Jnr逐渐降低,掺加SHA有利于提高沥青结合料高温抗变形能力与变形恢复能力;随着SHA的掺入,沥青结合料的蠕变劲度S与蠕变劲度变化率m变化幅度不大,对沥青结合料的低温抗裂性能影响不大.SHA改性沥青结合料高温抗车辙性能优异,低温性能相对于基质沥青PG分级保持不变.展开更多
In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,...In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,the rheological tests were carried out.These experiment results showed that the stress conditions,especially the stress level were the critical influencing factors of the rheological deformation properties.Under the low stress level(S=0.1),the granular soil showed the elastic properties,and there was no obvious rheological deformation.Under the middle stress level(0.2<S≤0.6),creep curves showed the linear viscoelastic rheological properties.However,under the high stress level(S>0.8) creep curves showed the non-linear viscous plastic rheological properties.Especially,under the stress level of S=1.0,the accelerated rheological phase of creep curves occurred at early time with a trend of failure.The stress level had obvious effects on the final rheological deformation of the soil sample,and the final rheological deformation increments nonlinearly increased with stress level.The final rheological deformation increment and step was little under low stress level,while it became large under high stress level,which showed the nonlinearly rheological properties of the granular soil.The confining pressure also had direct effects on final rheological deformation,and the final rheological deformation linearly increased with confining pressure increments.展开更多
基金support of Doctor Foundation of Shandong(No 2008BS04010)the National Natural Science Foundation of China(No 50903045)
文摘In this paper,phenyl silicone rubber is reinforced by precipitated silica which preconditioned with Hexamethyldisilazane.Their damping performance and thermal stability in the air are characterized by rheological test and TG respectively.Results show that the complex viscosity,storage modulus,loss modulus and damping factor of the filling type silicone rubber are improved.
文摘为研究超硬质沥青(super hard asphalt,SHA)对超硬质沥青结合料的高、低温流变的影响效果,采用SHA作为改性剂对AH-90道路石油沥青进行改性,制备了不同质量分数(5%、6%、7%和8%)的SHA改性结合料,并进行动态剪切流变试验、多应力蠕变恢复试验及小梁弯曲蠕变试验.试验结果表明:其适用于时温等效原理;SHA的掺入会有效提高沥青结合料的车辙因子G*/sinδ,沥青混合料的高温性能得到明显改善;随着SHA掺量的增加,沥青结合料的平均应变恢复率R逐渐升高,不可恢复蠕变柔量Jnr逐渐降低,掺加SHA有利于提高沥青结合料高温抗变形能力与变形恢复能力;随着SHA的掺入,沥青结合料的蠕变劲度S与蠕变劲度变化率m变化幅度不大,对沥青结合料的低温抗裂性能影响不大.SHA改性沥青结合料高温抗车辙性能优异,低温性能相对于基质沥青PG分级保持不变.
基金Project(200413) supported by Communication Science and Technology Fund of Hunan Province,China
文摘In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,the rheological tests were carried out.These experiment results showed that the stress conditions,especially the stress level were the critical influencing factors of the rheological deformation properties.Under the low stress level(S=0.1),the granular soil showed the elastic properties,and there was no obvious rheological deformation.Under the middle stress level(0.2<S≤0.6),creep curves showed the linear viscoelastic rheological properties.However,under the high stress level(S>0.8) creep curves showed the non-linear viscous plastic rheological properties.Especially,under the stress level of S=1.0,the accelerated rheological phase of creep curves occurred at early time with a trend of failure.The stress level had obvious effects on the final rheological deformation of the soil sample,and the final rheological deformation increments nonlinearly increased with stress level.The final rheological deformation increment and step was little under low stress level,while it became large under high stress level,which showed the nonlinearly rheological properties of the granular soil.The confining pressure also had direct effects on final rheological deformation,and the final rheological deformation linearly increased with confining pressure increments.
