陈国强��
【摘要】为了解决用现有型号微表处修复较深车辙会重复出现车辙的问题,阐述了开发新型号微表处的必要性;通过最大密实度曲线理论适应性分析、集料颗粒排列规律的推导及其试验,结合经验提出了适合微表处的最大密实度曲线;针对微表处施工工艺的特点,研究了集料内摩阻力的规律和稀浆混合料的和易性,提出了最佳和易性曲线;在最大密实度曲线和最佳和易性曲线的基础上,给出了确定微表处集料级配范围的方法。
【关键词】最大密实度曲线理论;沥青路面;车辙;微表处;集料级配范围
Research on micro-surfacing aggregate gradation range of design method based on theoretical maximum density of the curve
Chen Guo-qiang
(Pingdingshan City Highway AdministrationPingdingshanHenan467000)
【Abstract】In order to solve the existing model with micro-surfacing repair deep rut rutting problem will be repeated, explains the necessity to develop new models of micro-surfacing; adaptation analysis by the maximum density of the curve theory, the law of aggregate particles arranged derivation and its test, combined with the experience proposed maximum density of the curve for micro-surfacing; the characteristics of the construction process for micro-surfacing, studied law in the aggregate slurry frictional resistance and workability of the mix, made the best and easy curve; based on the maximum density of the curve and the curve of the best workability, given to determine the micro-surfacing aggregate gradation range of methods.
【Key words】The maximum density of the curve theory;Asphalt pavement; rut;Aggregate gradation range;Micro-surfacing
1. 前言
(1)修复沥青路面车辙是微表处的主要用途之一,用微表处修复沥青路面车辙是直接填补的唯一方法,同时也是经济高效的方法,目前均用MS-3型微表处填补车辙,其集料最大粒径为10mm。在我国,当修复沥青路面车辙时其深度普遍在20mm以上(称为“较深车辙”),如果用现有型号微表处材料直接填补,稀浆混合料摊铺厚度很大,而对于这种成型厚度超过集料最大粒径较多的微表处的抗车辙性能很差,其自身很快就会产生车辙。因此,绝大多数研究把重点放在致力于提高现有型号微表处的抗车辙性能上。
(2)典型的沥青路面结构分为三种:悬浮密实结构、骨架空隙结构和骨架密实结构,其中悬浮密实结构抗车辙性能最差,骨架密实结构抗车辙性能最强。微表处混合料与悬浮密实型混合料相比,级配细得多,细料含量多得多,油石比大得多,因此,成型厚度超过集料最大粒径较多的微表处的抗车辙性能比三种典型的沥青路面结构都要差得多。……