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基于GB5理论的超薄罩面混合料级配组成设计研究

丁龙亭1, 张凯星2, 张梦媛1, 申全军1, 王选仓3, 周博3

1.山东高速集团有限公司 创新研究院，山东 济南  250001；2.中公高科养护科技股份有限公司，北京  100095；3.长安大学 公路学院，陕西 西安  710064

摘要: 目的为了解决超薄罩面难压实、耐久性差的问题，提出一种新的级配组成设计方法对超薄罩面混合料进行级配组成设计。  方法基于集料嵌挤理论，通过三直线方程理论提出GB5超薄罩面级配设计方法，得到混合料级配设计过程流程图，并利用贝雷法验证级配的合理性。与传统配合比设计的混合料进行易密实性能、路用性能及表面功能耐久性能对比验证。  结果结果表明：与传统级配的沥青混合料相比，GB5设计级配下沥青混合料的压实能量指数降低，压实速率增大，更易于压实；GB5设计方法下沥青混合料的高温性能、低温性能提升较大，高温稳定性、低温破坏应变、残留稳定度和冻融劈裂强度均有不同程度的提高，劲度模量降低，混合料水稳定性略有提升；磨耗30 000次后，传统级配的沥青混合料表面功能耐久性能比GB5设计级配混合料的质量损失率约高出4.4%，且不同磨耗次数下构造深度均低于GB5设计级配的沥青混合料。  结论 试验证明GB5设计级配的沥青混合料表面功能耐久性更好，研究成果为超薄罩面级配设计提供了新思路，对超薄罩面的研究具有重要指导意义。

关键词:道路工程;超薄罩面;GB5理论;级配设计;路用性能;表面功能

doi:10.16186/j.cnki.1673-9787.2024030008

基金项目:国家自然科学基金资助项目（52308433）；重庆沪渝高速公路有限公司科技项目（HYGS2019-040）；内蒙古自治区交通运输厅科技项目（NJ-2018-23）

收稿日期:2024/03/04

修回日期:2024/08/07

出版日期:2026-07-24

Gradation composition design of ultra-thin overlay mixture based on GB5 theory

Ding Longting1, Zhang Kaixing2, Zhang Mengyuan1, Shen Quanjun1, Wang Xuancang3, Zhou Bo3

1.Innovation Research Institute， Shandong Hi-speed Group Co.， Ltd.， Jinan  250001， Shandong， China；2.Zhonggong Gaoke Maintenance Technology Co.， Ltd.， Beijing  100095， China；3.School of Highway， Chang’an University， Xi’an  710064， Shaanxi， China

Abstract: Objectives As one of the most widely used preventive maintenance techniques for pavements， ultra-thin overlays provide favorable conditions for safe and smooth traffic operation. To address the issues of insufficient compactability and poor durability of ultra-thin overlays， a new gradation design method was proposed for ultra-thin overlay mixtures.  Methods Based on the aggregate interlocking theory， a GB5 gradation design method for ultra-thin overlays was developed using a three-line equation approach. A gradation design procedure was established， and the rationality of the gradation was verified using the Bailey method. The compactability， pavement performance， and surface functional durability of the proposed mixture were compared with those of mixtures designed using conventional mix design methods.  Results Compared with conventional gradations， the asphalt mixture designed using the GB5 method exhibited a reduced compaction energy index （CEI） and a slightly higher compaction rate （K）， indicating improved compactability. The high- and low-temperature performance was significantly enhanced， with increases in high-temperature stability （10.6%）， low-temperature failure strain （19.6%）， residual stability （3.9%）， and freeze–thaw splitting strength （3.7%）， while stiffness modulus decreased by 23.7%. Water stability showed a slight improvement. Regarding surface functional durability， after 30，000 abrasion cycles， the mass loss rate of the conventional gradation was approximately 4.4% higher than that of the GB5 gradation. The texture depth under different abrasion cycles was also higher for the GB5 mixture， indicating better surface functional durability. Conclusions The proposed GB5 gradation design method improves the durability and surface functionality of ultra-thin overlays， providing a new approach for gradation design and offering valuable guidance for related research.

Key words:road engineering;ultra-thin overlay;GB5 theory;gradation design;pavement performance;surface functional durability