摘要
针对传统的马歇尔设计法在抗滑表层沥青混合料AK-13A设计中的不足,通过优化AK-13A级配、采用混合料GTM法配合比设计进行弥补。对沥青混合料的体积指标、路用性能、拌和工艺、碾压工艺都进行了详细的研究。依据贝雷法,将沥青混合料的级配范围进行适量的调整,使其更满足道路需求;通过GTM法配合比设计,提高压实度,降低孔隙率,满足日益增加的交通荷载要求。采用GTM方法成型试件,并对试件进行切割,用马歇尔方法进行沥青混合料路用性能验证。将马歇尔方法和GTM方法成型的试件试验结果进行对比分析,研究不同的配合比设计方法对沥青混合料路用性能指标的影响。试验得出,优化后的AK-13A级配下限通过率增大,保证混合料密实,上限通过率减小,保证路面的抗滑,路面4.75 mm以上碎石较多且无明显离析现象;采用GTM方法设计的混合料油石比低、密度高,比马歇尔密度提高2%,在现有施工设备条件下,能够达到较高的压实度,使抗滑表层的路面实际空隙率控制在4.5~5.5%;路面表面构造深度达到0.65,横向力系数SFC60达到75,渗水系数在50 m L/min以内,同时平整度标准差σ达到0.53 mm,各项检测指标都远远优于交工验收的标准。级配范围、配合比设计方法调整后得到的AK-13A抗滑表层具有优良的抗水损、抗滑和抗车辙性能。
The deficiency of the traditional Marshall design method in the design of skid-resistant surface asphalt mixture AK - 13A is compensated by optimizing the AK - 13A gradation and using the mix proportion in GTM method for mixture designing. The volume index, road performance, mixing process and milling process of asphalt mixture are studied in detail. According to the Bailey method, the gradation range of asphalt mixture is moderate adjusted to meet the road requirements. The compaction degree is improved and the porosity is reduced by mix proportion in GTM method for designing to meet the increasing traffic load requirements. The specimens are moulded by GTM method and are cut, and the pavement performance of asphalt mixture is verified by Marshall method. The test results of the specimens moulded by Marshall and GTM methods are comparatively analyzed to study the effect of different mix proportions on the pavement performance of asphalt mixture. The test result shows that （ 1 ） The lower limit pass rate of the optimized AK- 13A gradation is increased to ensure the mixture compactness, the upper limit pass rate reduced to ensure the anti-sliding road surface, the 4.75 mm sized aggregate is more than usual and the road surface has no obvious segregation. （2） The asphalt mixture designed by GTM method has lower asphalt-aggregate ratio and higher density which is increased by 2% than that designed by Marshall method. Under the existing construction conditions, high compaction degree can be reached and the porosity of the anti-sliding surface layer can be controlled in 4.5 %-5.5 %.（3） The pavement surface structure depth reached 0. 65, the lateral force coefficient SFC6o reached 75, the water permeability coefficient is smaller than 50 ml/min, and the standard deviation σ of the flatness reached 0. 53 mm, all the test indexes are much better than acceptance criteria. （4） The AK- 13A anti-sliding surface layer has excellent water damage resistance, anti-slip and anti-rutting properties after adjustment of gradation range and mix proportion.
作者
郭金星
张书华
GUO Jin-xing;ZHANG Shu-hua(Henan Transportation Research Institute Co.,Ltd.,Zhengzhou Henan 450000,Chin)
出处
《公路交通科技》
CAS
CSCD
北大核心
2018年第8期40-45,共6页
Journal of Highway and Transportation Research and Development
基金
河南省交通运输厅科技项目(2009D110)
