Abstract
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.
Highlights
Ere is a lack of systematic study on the interlaminar bonding performance and its durability between the wearing course and the used pavement or the underlying layer
Liu et al applied waterborne epoxy resin emulsified asphalt (WEA) to the waterproof bonding layer of bridge deck pavement, and the research results showed that its shear strength, pull-out strength, and shear fatigue performance were better than high those of viscosity asphalt and SBSmodified asphalt [27,28]. e above studies showed that WEA has good interlaminar bonding and water stability performance
WEA was selected as the interlaminar bonding material for the ultrathin OGFC. e bonding layer and the construction timing of the open-graded asphalt mixture were optimized. e road performance, wear resistance and interlaminar bonding durability of the ultrathin OGFC were comprehensively evaluated
Summary
5.5 particle size aggregate open-graded asphalt mixture were determined according to the binder drainage mass loss and Cantabro mass loss [2]. To evaluate the high-temperature bonding performance of the bonding layer, the interlaminar shear strength was tested at 25°C, 40°C, and 60°C In this experiment, the content of WER in WEA was 20%, and its spraying amount was 1 kg/ m2. According to the determined aggregate spreading and interlaminar bonding materials spraying scheme, the friction course composite structure specimens were prepared and cured. To determine the effect of the open-graded asphalt mixture construction time on interlaminar bonding performance, two schemes were designed to prepare the friction course composite structure specimen. E construction time of the open-graded asphalt mixture was determined by comparing the interlaminar shear strength of the composite structure specimens.
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