This study aims to optimize the bonding performance between the wearing course and the used pavement or the underlying layer and further improve the service quality and durability of the open-graded friction course with small particle size aggregate (ultrathin OGFC). The ultrathin OGFC including waterborne epoxy resin emulsified asphalt (WEA) bonding layer and open-graded asphalt concrete with 9.5 mm nominal maximum aggregate size gradation was optimized. The construction timing of the open-graded asphalt mixture was determined. The road performance, wear resistance, and interlaminar bonding durability of the ultrathin OGFC were comprehensively evaluated. The results show that, based on the basic properties of the open-graded asphalt mixture, its asphalt aggregate ratio is recommended to be 5.0–5.5%. Based on interlaminar shear strength, it is recommended that the open-graded asphalt mixture is paved immediately after WEA bonding material was sprayed, and the bonding layer does not spread aggregate. The WEA containing 20% waterborne epoxy resin (WER) is recommended as bonding layer for the ultrathin OGFC, and the optimized spraying amount is 1 kg/m². The ultrathin OGFC has good antisliding, drainage, and wear resistance properties. The interlaminar bonding performance, water stability, and durability of WEA bonding layer are obviously better than those of high viscosity asphalt (HVA) and SBS-modified asphalt. The WEA bonding layer can better resist interlaminar shear failure and improve the service quality and service life of the ultrathin OGFC.

中文翻译：

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小粒径骨料开放式摩擦过程的设计优化与性能评估

这项研究的目的是优化磨损层与使用过的人行道或下层之间的粘结性能，并进一步改善具有小粒径骨料（超薄OGFC）的开放级摩擦层的使用质量和耐久性。优化了超薄OGFC，包括水性环氧树脂乳化沥青（WEA）粘结层和标称最大骨料最大灰级为9.5 mm的开放级沥青混凝土。确定了开放级沥青混合料的施工时间。综合评估了超薄OGFC的路用性能，耐磨性和层间粘合耐久性。结果表明，基于开放级沥青混合料的基本性能，建议其沥青骨料比率为5.0–5.5％。根据层间剪切强度，建议在喷涂WEA粘结材料后立即铺砌开放级沥青混合料，并且粘结层不要散布骨料。建议将包含20％水性环氧树脂（WER）的WEA用作超薄OGFC的粘结层，并且最佳喷涂量为1 kg / m²。超薄OGFC具有良好的防滑，排水和耐磨性能。WEA粘结层的层间粘结性能，水稳定性和耐久性明显优于高粘度沥青（HVA）和SBS改性沥青。WEA粘结层可以更好地抵抗层间剪切破坏，并提高超薄OGFC的使用寿命和使用寿命。