【作者】 李惠霞；

【导师】 童申家；

【作者基本信息】 西安建筑科技大学 ， 桥梁与隧道工程， 2013， 博士

【摘要】 紫外光老化是强紫外光照地区沥青路面一种主要的老化形式，现今对紫外光老化的研究多集中在沥青结合料或者是沥青混合料宏观路用性能的研究，有一定的局限性。本文基于细观力学研究紫外光老化沥青混合料在不同影响因素下的细观力学性能，并结合宏观路用性能提出强紫外光地区抗紫外光老化的沥青混合料材料设计方法。本文分析了我国太阳辐射强度的分区情况及紫外光照辐射对沥青路面的影响情况，选用合适的室内模拟紫外光照光源，制作了室内加速紫外光老化试验箱。本文进行沥青砂的单轴压缩蠕变试验，根据试验结果拟合了不同光照时间、不同集料级配和不同油石比时沥青砂的伯格斯模型四参数，为微观结构分析奠定了基础。根据该四参数在老化前后的变化分析了沥青砂的粘弹性能变化，结果表明AC-13S1型级配和AC-16S1型级配粘弹比值变化最小，AC-13II型（5.5%）和AC-16II型（5.5%）油石比粘弹比值最小，受紫外光老化影响最小。对不同老化时间和粘弹性参数进行拟合提出沥青混合料的紫外光老化评价指标J (h,1200)。利用离散元程序建立沥青混合料二维数值模型，结合不同光照时间、不同集料级配和不同油石比的细观力学参数，进行这些不同影响因素下的虚拟单轴蠕变试验。通过该虚拟试验获得紫外光老化前后沥青混合料的应变、颗粒间的正向接触力和剪切接触力，分析这些细观力学特性，研究不同影响因素对沥青混合料性能的影响，从而提出AC-13S1型级配和AC-16S1型级配，AC-13II型和AC-16II型油石比的微观接触力老化前后变化最小，受紫外光老化影响最小。进行了不同影响因素下的低温抗裂性能和高温稳定性能研究，综合路用性能研究推荐AC-13S1型级配和AC-16S1型级配，AC-13II型和AC-16II型油石比。研究表明细观力学分析结果和宏观路用性能分析结果一致，验证细观力学分析是可靠的，并推荐合理材料设计为AC-13S1和AC-16S1型级配及油石比(5.5%)。更多还原

【Abstract】 Ultraviolet aging is one of the major forms of aging in strong UV irradiationof asphalt pavement. Today, researchers paid more attention on the asphalt binderor the asphalt mixture macro-road performance. Based on micromechanics, themicro-mechanical performance of UV aging asphalt mixture is discussed with itsunder different influencing factors. Combined with road performance and anti-UVaging asphalt mixture material design is promoted about strong UV region.This paper analyzes the partition of the solar radiation intensity and UVirradiation of radiation on the asphalt pavement. Establish indoor accelerated UVaging chamber by the appropriate choice of indoor simulated UV irradiation lightsource.In order to get the required parameters of numerical mode,tar sands uniaxialcompression creep tests are made. According to the test results to fit a differentlight, different aggregate gradation and asphalt content tar sands Burgers modelwith four parameters.UV aging asphalt mixture aging evaluation based on thefitted parameters with aging time relationship. To establish the parameters of thenumerical model, the parameters can be converted micromechanical parametersfor the establishment of a numerical model and virtual test.The results showedthat AC-13S1and AC-16S1gradation have minimum viscoelastic ratios andAC-13II (5.5%) and AC-16II (5.5%) have minimum viscoelastic ratio. UV agingasphalt mixture aging evaluation J (h,1200) is proposed by different aging timeand the viscoelastic parameters.Create a two-dimensional asphalt mixture numerical model using discreteelement program, and do virtual uniaxial creep under these different influencing factors tests based on a combination of different illumination time, different setGradation and asphalt content micromechanics parameters. Acquire strain, normalcontact forces between the particles and shear contact force of before and afterUV aging asphalt mixture through the virtual test. Find different influencingfactors on the performance of asphalt mixture by analyzing these micromechanicscharacteristics. Minimal change AC-13S1and AC-16S1gradation, AC-13II andAC-16II are proposed by less change in micro-contact force before and afteraging.In order to verify the anti-UV material aging asphalt mixture design methodbased on micromechanics study, and get the corresponding material designmethod based on macro-Road Performance of, the low temperature crackresistance and high temperature stability studies under diffirent factors.Recommend reasonable material designed for AC-13S1and AC-16S1gradationand aggregate ratio (5.5%).更多还原