摘要
为了研究纤维种类及掺量对桥面铺装浇注式沥青混合料路用性能的影响,首先基于关键指标对混合料的矿料级配进行了设计。然后研究了不同掺量的颗粒木质素纤维、玄武岩纤维、聚酯纤维对浇注式沥青混合料高低温性能、水稳定性、疲劳性能的影响。再基于加速加载试验对浇注式沥青混合料的长期耐久性能进行了评价,建立了桥面全厚度沥青混合料铺装的耐久性能预测方程。最后分析了纤维增强沥青混合料性能作用机理。结果表明:纤维能够明显改善浇注式沥青混合料的路用性能;不同类别的纤维对沥青混合料性能提升作用各异,玄武岩纤维的改善效果优于木质素纤维和聚酯纤维;纤维对浇注式沥青混合料性能的增强作用随纤维掺量的增加先增大后减小;木质素纤维、玄武岩纤维、聚酯纤维在最佳掺量4%,6%,8%时,混合料的性能最优;浇注式沥青混合料高温抗永久变形能力相对较差,试验车辙动稳定度不超过500次/mm;在最佳掺量下,木质素纤维、玄武岩纤维、聚酯纤维可分别提升浇注式沥青高温抗车辙性能的72%,94%,44%;纤维增强浇注式沥青混合料的疲劳寿命随应变水平的增加呈指数函数递减趋势;组合铺装结构(3.5 cmSMA13+下面层3 cmGA10)的车辙深度与加速加载次数呈良好的指数关系,加速加载试验结合数值分析方法能够较为准确地预测铺装结构的耐久性能。
In order to study the influence of different kinds and dosages of fibers on the pavement performance of gussasphalt concrete for bridge deck pavement,the mineral gradation of the mixture is designed based on the key indicators at first.Then,the influences of different dosages of granular lignin fiber,basalt fiber and polyester fiber on the high and low temperature performance,water stability and fatigue performance of gussasphalt mixture are studied.Afterwards,based on the accelerated loading test,the long-term durability of the gussasphalt mixture is evaluated,the prediction equation for the durability of full thickness asphalt mixture for bridge deck is established.Finally,the mechanism of fiber-reinforced asphalt mixture's performance is analyzed.The result shows that(1)fibers can obviously improve the pavement performance of gussasphalt mixture;(2)different types of fibers have different effects on the performance improvement of asphalt mixture,and the improvement effect of basalt fiber is better than that of lignin fiber and polyester fiber;(3)the enhancement effect of fiber on the performance of gussasphalt mixture increases at first and then decreases with the increase of fiber dosage;(4)when the optimal dosages of lignin fiber,basalt fiber and polyester fiber is 4%,6%,8%respectively,the performance of the mixture is the best;(5)the gussasphalt mixture has relatively poor high-temperature resistance to permanent deformation,and its test rutting stability shall not exceed 500 times/mm;(6)at the optimal dosage,lignin fiber,basalt fiber and polyester fiber can increase the rutting resistance of gussasphalt by 72%,94%,44%respectively;(6)the fatigue life of fiber-reinforced gussasphalt mixture decreases exponentially with the increase of strain level;(7)the rutting depth of the composite pavement structure(3.5 cmSMA13+3 cmGA10 lower surface layer)has a good exponential relationship with the accelerated loading times,and the combination of accelerated loading test with numerical analysis method can more accurately predict the durability of the pavement structure.
作者
陈华明
王志祥
CHEN Hua-ming;WANG Zhi-xiang(Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou Guangdong 510550,China;Guangdong Hualu Transportation Technology Co.,Ltd.,Guangzhou Guangdong 510420,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2021年第7期1-8,共8页
Journal of Highway and Transportation Research and Development
基金
广东省交通运输厅科技项目(科技-2016-02-004)。
